From: Wayland, Robertj [mailto:Wayland.Robertj@epa.gov] 

Sent: Wednesday, May 28, 2014 10:43 PM 

To: Higgins, Cortney 

Cc: Culligan, Kevin; Chappell, Linda; Weatherhead, Darryl; Lamson, Amy; CurryBrown, 

Amanda 

Subject: 

Cortney - 

Please find attached the revised RIA in a single, common document. There are still some 

pagination issues that we will correct in the final version; however, we wanted to get this over to 

you tonight for your/interagency review. Please let Kevin/me know if you have any 

questions/concerns. 

thanx! 

 

bob 

Robert J. Wayland, Ph.D. 

Leader, Energy Strategies Group 

U.S. Environmental Protection Agency 

Office of Air Quality Planning and Standards 

Sector Policies and Programs Division 

Mail Code D243-01 

Research Triangle Park, North Carolina 27709 

 

Office: (919) 541-1045 

Cell: (919) 306-2290 

Fax: (919) 541-5450 

 

Email: wayland.robertj@epa.gov 

 

************************************** 

DRAFT/Deliberative Document - FOIA EXEMPT 

************************************** 

<< EO 12866 GHG EGU RIA OMB Draft Combined file 052814.docx >> 
***E.O. 12866 Review- Draft- Do Not Cite, Quote, or Release During Review*** 

Regulatory Impact Analysis for Emission 

Guidelines for Greenhouse Gas Emissions 

from Existing Stationary Sources: Electric 

Utility Generating Units 

June 2014 
CONTACT INFORMATION 

This document has been prepared by staff from the Office of Air Quality Planning and 

Standards, the Office of Atmospheric Programs, and the Office of Policy of the U.S. 

Environmental Protection Agency. Questions related to this document should be addressed to 

Linda M. Chappell, U.S. Environmental Protection Agency, Office of Air Quality Planning and 

Standards, Research Triangle Park, North Carolina 27711 (email: chappell.linda@epa.gov). 

ACKNOWLEDGEMENTS 

Thank you to the many staff who worked on this document from EPA Offices including 

the Office of Air Quality Planning and Standards, the Office of Atmospheric Programs, and the 

Office of Policy. Contributions to this report were also made by RTI International and ICF 

International. 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

iii 

EPA -542/R-14-002 

June 2014 

Official Title Regulatory Impact Analysis 

U.S. Environmental Protection Agency 

Office of Air Quality Planning and Standards 

Health & Environmental Impacts Division 

Air Economics Group 

Research Triangle Park, North Carolina 27711 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

iv 

TABLE OF CONTENTS

Table of Contents ......................................................................................................................................... iv 

List of Tables ............................................................................................................................................. viii 

List of Figures .............................................................................................................................................. xi 

ACRONYMS ............................................................................................................................................. xii 

EXECUTIVE SUMMARY .......................................................................................................................... 1 

ES.1 Background and Context of Proposed EGU GHG Existing Source Guidelines .................................. 1 

ES.2 Summary of Proposed EGU GHG Existing Source Guidelines ........................................................... 1 

ES.3 Control Strategies for Existing EGUs .................................................................................................. 3 

ES.4 Costs of Existing EGU Guidelines ....................................................................................................... 7 

ES.5 Monetized Climate Benefits and Health Co-benefits for Existing EGUs ............................................ 9 

ES.5.1 Estimating Global Climate Benefits ....................................................................................... 13 

ES 5.2 Estimating Air Pollution Health Co-Benefits ......................................................................... 14 

ES 5.3 Combined Benefits Estimates ................................................................................................. 17 

ES.6 Monetized Benefits, Compliance Costs and Net Benefits of the Proposed Guidelines for Existing 

Sources 20 

ES.7 Economic Impacts of the Proposed Emission Guidelines for Existing EGUs ................................... 24 

ES.8 Economic Impacts of the Proposed Guidelines for Existing EGUs in Sectors Other Than the EGU 

Sector and Employment Impacts ................................................................................................................ 25 

ES.9 Modified and Reconstructed Sources ................................................................................................. 26 

ES.10 References ........................................................................................................................................ 27 

CHAPTER 1: INTRODUCTION AND BACKGROUND ......................................................................... 1 

1.1 Introduction ............................................................................................................................................. 1 

1.2 Legal, Scientific and Economic Basis for this Rulemaking .................................................................... 1 

1.2.1 Statutory Requirement ..................................................................................................................... 1 

1.2.2 Health and Welfare Impacts from Climate Change ......................................................................... 2 

1.2.3 Market Failure .................................................................................................................................. 3 

1.3 Summary of Regulatory Analysis ........................................................................................................... 3 

1.4 Background for the Proposed EGU Existing Source GHG Guidelines .................................................. 4 

1.4.1 Base Case and Years of Analysis ..................................................................................................... 4 

1.4.2 Definition of Affected Sources ........................................................................................................ 5 

1.4.3 Regulated Pollutant .......................................................................................................................... 5 

1.4.4 Emission Guidelines ........................................................................................................................ 6 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

v 

1.5 Organization of the Regulatory Impact Analysis .................................................................................... 6 

1.6 References ............................................................................................................................................... 8 

CHAPTER 2 ................................................................................................................................................. 2 

CHAPTER 3 ............................................................................................... Error! Bookmark not defined.

Appendix 3A: Analysis of Potential Upstream Methane Emissions Changes in Natural Gas Systems and 

Coal Mining .................................................................................................................................................. 1 

3A.1 General Approach ............................................................................................................................ 1 

3A.1.1 Analytical Scope ........................................................................................................................... 1 

3A.1.2 Coal Mining Source Description ................................................................................................... 3 

3A.1.3 Natural Gas Systems Source Description ...................................................................................... 3 

3A.1.4 Compliance Approaches Examined .............................................................................................. 5 

3A.1.5 Activity Drivers ............................................................................................................................. 6 

3A.2 Results .................................................................................................................................................. 8 

3A.2.1 Primary Results ............................................................................................................................. 8 

3A.2.2 Sensitivity Analysis: Side Case Incorporating More Coal Production Geographic Detail ......... 10 

3A.2.3 Uncertainties and Limitations ..................................................................................................... 11 

3A.3 Methodologies .................................................................................................................................... 12 

3A.3.1 Coal Mining ................................................................................................................................ 12 

3A.3.2 Natural Gas Systems ................................................................................................................... 15 

3A.4 References .......................................................................................................................................... 29 

CHAPTER 4 ............................................................................................... Error! Bookmark not defined.

Appendix 4A: Generating Regional Benefit-per-Ton Estimates for Electric Generating Units .................. 1 

4A.1 Overview of Benefit-per-Ton Estimates .............................................................................................. 1 

4A.2 Underlying Source Apportionment Air Quality Modeling .................................................................. 2 

4A.3 Regional PM2.5 Benefit-per-Ton Estimates for EGUs .......................................................................... 3 

4A.4 Regional Ozone Benefit-per-Ton Estimates ...................................................................................... 16 

4A.5 Evaluating the Benefit-per-Ton Estimates ........................................................................................ 19 

4A.6 References ............................................................................................................................................ 3 

CHAPTER 5: ECONOMIC IMPACTS – MARKETS Outside the Electricity Sector ................................ 1 

5.1 Introduction ...................................................................................................................................... 1 

5.2 Summary of Secondary Market Impacts of Energy Price Changes ........................................................ 3 

5.3.1 Share of Total Production Costs ...................................................................................................... 5 

5.3.2 Ability to Substitute between Inputs to the Production Process ...................................................... 5 

5.3.3 Availability of Substitute Goods and Services ................................................................................. 5 

5.4 Conclusions ............................................................................................................................................. 6 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

vi 

CHAPTER 6: Employment Impact Analysis ............................................................................................... 1 

6.1 Introduction ............................................................................................................................................. 1 

6.2 Overview of the Proposed EGU GHG Existing Source Guidelines ....................................................... 1 

6.2.1 Determining State Goals Utilizing the Four Building Blocks .......................................................... 2 

6.3 Economic Theory and Employment ....................................................................................................... 2 

6.4 Current State of Knowledge Based on the Peer-Reviewed Literature .................................................... 6 

6.4.1 Regulated Sector .............................................................................................................................. 7 

6.4.2 Labor Supply Impacts ...................................................................................................................... 9 

6.5 Recent Employment Trends .................................................................................................................. 10 

6.5.1 Electric Power Generation ............................................................................................................. 10 

6.5.2 Fossil Fuel Extraction .................................................................................................................... 11 

6.5.3 Clean Energy Employment Trends ................................................................................................ 13 

6.6 Projected Sectoral Employment Changes due to Proposed Guidelines ................................................ 17 

6.6.1 Projected Changes in Employment in Electricity Generation and Fossil Fuel Extraction ............. 19 

6.6.2 Projected Changes in Employment in Demand-Side Energy Efficiency Activities .......................... 26 

6.7 Conclusion ............................................................................................................................................ 30 

6.8 References ............................................................................................................................................. 33 

Appendix 6A: Estimating Supply-Side Employment Impacts of the Proposed EGU GHG Existing Source 

Guidelines ..................................................................................................................................................... 1 

A6.1 General Approach ............................................................................................................................. 1 

6A.1.1 Employment Effects Included In the Analysis .............................................................................. 2 

A6.2 Employment Changes due to Heat Rate Improvements .................................................................... 3

A6.2.1 Employment Changes Due to Building (or Avoiding) New Generation Capacity ....................... 4 

A6.2.2 Employment Changes due to Coal and Oil/Gas Retirements ........................................................ 7 

A6.2.3 Employment Changes due to Coal and Oil/Gas Retirements ........................................................ 8 

CHAPTER 7: Statutory and executive Order Analysis ............................................................................... 1 

7.1 Executive Order 12866, Regulatory Planning and Review, and Executive Order 13563, Improving 

Regulation and Regulatory Review .............................................................................................................. 1 

7.2 Paperwork Reduction Act ....................................................................................................................... 2 

7.3 Regulatory Flexibility Act ...................................................................................................................... 4 

7.4 Unfunded Mandates Reform Act (UMRA) ............................................................................................ 6 

7.5 Executive Order 13132, Federalism ........................................................................................................ 7 

7.6 Executive Order 13045, Protection of Children from Environmental .................................................... 8 

Health Risks and Safety ................................................................................................................................ 8 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

vii 

7.7 Executive Order 13211, Actions Concerning Regulations that Significantly Affect Energy Supply, 

Distribution, or Use 9 

7.8 National Technology Transfer and Advancement Act (NTTAA) .......................................................... 9 

7.8 Executive Order 12898: Federal Actions to Address Environmental Justice in Minority Populations 

and Low-Income Populations 9 

7.10 Executive Order 13175 - Consultation and Coordination with Indian Tribal Governments ........... 13 

CHAPTER 8: COMPARISON OF BENEFITS AND COSTS ................................................................... 1 

8.1 Comparison of Benefits and Costs .......................................................................................................... 1 

CHAPTER 9: Benefits, Costs, and Economic Impacts of Standards of Performance for Reconstructed 

and Modified Electric Utility Generating Units ............................................................................................ 1 

9.1 Introduction ............................................................................................................................................. 1 

9.2 Legal Basis for this Rulemaking ............................................................................................................. 1 

9.3 Background for the Proposed EGU Reconstructed and Modified Source GHG Standards .................... 2 

9.3.1 Definition of Affected Sources ........................................................................................................ 2 

9.3.2 Emission Limits ............................................................................................................................... 3 

9.4 Impacts of the Proposed Reconstructed and Modified Source Standards ............................................... 5 

9.4.1 Reconstructed Sources ..................................................................................................................... 5 

9.4.2 Modified Sources ............................................................................................................................. 5 

9.5 Statutory and Executive Order Requirements ....................................................................................... 13 

9.5.1 Executive Order 12866, Regulatory Planning and Review, and Executive Order 13563, 

Improving Regulation and Regulatory Review ....................................................................................... 13 

9.5.2 Paperwork Reduction Act .............................................................................................................. 13 

9.5.3 Regulatory Flexibility Act ............................................................................................................. 15 

9.5.4 Unfunded Mandates Reform Act (UMRA) .................................................................................... 17 

9.5.5 Executive Order 13132, Federalism ............................................................................................... 19 

9.5.6 Executive Order 13175, Consultation and Coordination with Indian Tribal Governments ........... 19 

9.5.7 Executive Order 13045, Protection of Children from Environmental Health Risks and Safety 

Risks ........................................................................................................................................................ 21 

9.5.8 Executive Order 13211, Actions Concerning Regulations that Significantly Affect Energy 

Supply, Distribution, or Use ................................................................................................................... 21 

9.5.9 National Technology Transfer and Advancement Act ................................................................... 21 

9.5.10 Executive Order 12898: Federal Actions to Address Environmental Justice in Minority 

Populations and Low-Income Populations .............................................................................................. 22 

9.6 References ............................................................................................................................................. 24 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

viii 

LIST OF TABLES

Table ES-1. Proposed State Goals (Adjusted MWh-Weighted-Average Pounds of CO2 per Net MWh 

from all Affected Fossil Fuel-Fired EGUs) for Options 1 and 2 ............................................... 4

Table 9-1. Proposed Emission Limits - Reconstructions ............................................................................. 3

Table 9-2. Proposed Emission Limits - Modifications ................................................................................ 4

Table 9-3. Annualized Costs and Fuel Savings of Efficiency Improvements (millions of 2011$) ............. 8

Table 9-4. Emission Reductions from Efficiency Improvements (tons/year) .............................................. 9

Table 9-5. Summary of National Benefit-per-ton Estimates for EGUs in 2025 ........................................ 10

Table 9-6. Estimated Global Climate Benefits of Illustrative CO2 Reductions in 2025 (millions of 

2011$)* .................................................................................................................................... 10

Table 9-7. Summary of Estimated Monetized Health Co-benefits of Illustrative Efficiency Improvements 

in 2025 (thousands of 2011$)* ................................................................................................ 11

Table 9-8. Combined Estimated Climate Benefits and Health Co-Benefits of Illustrative Efficiency 

Improvements in 2025 (millions of 2011$)* ........................................................................... 12

 Table 3-19. 2025 Projected Contiguous U.S. and Regional Retail Electricity Prices (cents/kWh) ....... 3-31 

Table 3-20. 2030 Projected Contiguous U.S. and Regional Retail Electricity Prices (cents/kWh) ........ 3-32 

Table 3-21. Projected Changes in Average Electricity Bills ................................................................... 3-33 

Table 3A-1. Base Year Upstream Emissions in the U.S. GHG Inventory ............................................. 3A-5 

Table 3A-2. Projected Coal Production Impacts, Option 1 ................................................................... 3A-7 

Table 3A-3. Projected Coal Production Impacts Option 2 .................................................................... 3A-8 

Table 3A-4. Projected Natural Gas Production Impacts, Option 1 ........................................................ 3A-8 

Table 3A-5. Projected Natural Gas Production Impacts, Option 2 ........................................................ 3A-9 

Table 3A-6. Upstream Emissions Changes, Baseline to Compliance Scenarios ................................. 3A-11 

Table 3A-7. Upstream Emissions Changes, Baseline to Compliance Scenarios, Side Case Incorporating 

More Coal Production Geographic Detail ......................................................................... 3A-12 

Table 4-1. Climate Effects ........................................................................................................................ 4-2 

Table 4-2. Global Social Cost of CO2, 2015-2050 (in 2011$) ................................................................ 4-14 

Table 4-3. Estimated Global Climate Benefits of CO2 Reductions for the Proposed EGU GHG Existing 

Source Guidelines in 2020 (billions of 2011$) ..................................................................... 4-14 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

ix 

Table 4-4. Estimated Global Climate Benefits of CO2 Reductions Proposed EGU GHG Exisitng Source 

Guidelines in 2025 (billions of 2011$) ................................................................................. 4-14 

Table 4-5. Estimated Global Climate Benefits of CO2 Reductions for the Proposed EGU GHG Existing 

Source Guidelines in 2030 (billions of 2011$) ..................................................................... 4-15 

Table 4-6. Human Health Effects of Ambient PM2.5 and Ozone ............................................................ 4-19 

Table 4-7. Summary of National and Regional Benefit-per-Ton Estimates for EGUs in 2020 (2011$) 4-28 

Table 4-8. Summary of National and Regional Benefit-per-Ton Estimates for EGUs in 2025 (2011$) 4-28 

Table 4-9. Summary of National and Regional Benefit-per-Ton Estimates for EGUs in 2020 (2011$) 4-29 

Table 4-10. Emission Reductions of Criteria Pollutants for the Proposed EGU GHG Existing Source 

Guidelines in 2020 (thousands of short tons) ....................................................................... 4-29 

Table 4-11. Emission Reductions of Criteria Pollutants for the Proposed EGU GHG Existing Source 

Guidelines in 2025 (thousands of short tons) ....................................................................... 4-30 

Table 4-12. Emission Reductions of Criteria Pollutants for the Proposed EGU GHG Existing Source 

Guidelines in 2030 (thousands of short tons) ....................................................................... 4-31 

Table 4-13. Summary of Estimated Monetized Health Co-Benefits for the Proposed EGU GHG Existing 

Source Guidelines in 2020 (millions of 2011$) ................................................................... 4-32 

Table 4-14. Summary of Estimated Monetized Health Co-Benefits for the Proposed EGU GHG Existing 

Source Guidelines in 2025 (millions of 2011$) ................................................................... 4-33 

Table 4-15. Summary of Estimated Monetized Health Co-Benefits for the Proposed EGU GHG Existing 

Source Guidelines in 2030 (millions of 2011$) ................................................................... 4-34 

Table 4-16. Summary of Avoided Health Incidences from PM2.5-Related and Ozone-Related Co-Benefits 

for Proposed EGU GHG Existing Source Guidelines in 2020 ............................................. 4-35 

Table 4-17. Summary of Avoided Health Incidences from PM2.5-Related and Ozone-Related Co-Benefits 

for Proposed EGU GHG Existing Source Guidelines in 2025 ............................................. 4-36 

Table 4-18. Summary of Avoided Health Incidences from PM2.5-Related and Ozone-Related Co-Benefits 

for Proposed EGU GHG Existing Source Guidelines in 2030 ............................................. 4-37 

Table 4-19. Population Exposure in the Baseline Modeling Above and Below Various Concentrations 

Benchmarks in the Underlying Epidemiology Studies......................................................... 4-45 

Table 4-20. Combined Climate Benefits and Health Co-Benefits for Proposed EGU GHG Existing 

Source Guidelines in 2020 (billions of 2011$) ..................................................................... 4-48 

Table 4-21. Combined Climate Benefits and Health Co-Benefits for Proposed EGU GHG Existing 

Source Guidelines in 2025 (billions of 2011$) ..................................................................... 4-49 

Table 4-22. Combined Climate Benefits and Health Co-Benefits for Proposed EGU GHG Existing 

Source Guidelines in 2030 (billions of 2011$) ..................................................................... 4-50 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

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Table 4-23. Unquantified Health and Welfare Co-Benefits Categories .................................................. 4-52 

Table 5-1. Estimated Percentage Changes in Energy Prices, by Energy Type and Regulatory Option ... 5-3 

Table 6-1. U. S. Green Goods and Services (GGS) Employment (annual average) ............................... 6-16 

Table 6-2. Renewable Electricity Generation-Related Employment ...................................................... 6-17 

Table 6-3. Energy and Resources Efficiency-Related Employment ....................................................... 6-18 

Table 6-4. Engineering-Based Changes in Labor Demand in 2020, 2025 and 2030, Regional Compliance 

Approach (number of years of employment in year) ........................................................... 6-24 

Table 6-5. Engineering-Based Changes in Labor Demand in 2020, 2025 and 2030, State Compliance 

Approach (number of job-years of employment in year) ..................................................... 6-25 

Table 6-6. Estimated Demand-Side Energy Efficiency Employment Impacts for Option 1 and Option 2 

Both Regional and State Compliance Approaches ............................................................... 6-28 

Table 6-7. Supply Side and Demand Side Employment Impacts in 2020, 2025 and 2030, Regional 

Compliance Approach (number of job-years of employment in year) ................................. 6-32 

Table 6-8. Supply Side and Demand Side Employment Impacts in 2020, 2025 and 2030, State 

Compliance Approach (number of job-years of employment in year) ................................. 6-32 

Table 7-1. Potentially Regulated Categories and Entities. ........................................................................ 7-4 

Table 8-1. Summary of Monetized Benefits, Compliance Costs, and Net Benefits for the Proposed 

Guidelines – 2020 (billions of 2011$) .................................................................................... 8-3 

Table 8-2. Summary of Monetized Benefits, Compliance Costs, and Net Benefits for the Proposed 

Guidelines – 2025 (billions of 2011$) .................................................................................... 8-4 

Table 8-3. Summary of Monetized Benefits, Compliance Costs, and Net Benefits for the Proposed 

Guidelines – 2030 (billions of 2011$) .................................................................................... 8-5 

 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

xi 

LIST OF FIGURES

Figure 4A-1. Conceptual Overview of Benefit-per-Ton Calculation .......................................................... 2

Figure 4A-2. Modeled PM2.5 Concentrations Attributable to EGUs in 2016 (Annual Mean, in μg/m3

) 

(Source: BPT TSD) ................................................................................................................... 4

Figure 4A-3. Modeled PM2.5 Concentrations Attributable to EGUs by Precursor in 2016 (Annual Mean, 

in μg/m3

) .................................................................................................................................... 6

Figure 4A-4. Regional Breakdown .............................................................................................................. 7

Figure 4A-5. Breakdown of Directly Emitted PM2.5 Emissions from EGU in Sector Modeling ................. 8

Figure 4A-6. Modeled Average Ozone Concentrations Attributable to EGUs in 2016 (Daily 8-hour 

maximum, May-September, in ppb) ........................................................................................ 17

Figure 4A-7. Comparison of Base Case SO2 Emissions in 2020 ............................................................... 21

Figure 4A-8. Comparison of Base Case Annual NOx Emissions in 2020 ................................................. 22

Figure 4A-9. Comparison of Base Case Ozone-season NOx Emissions in 2020 ...................................... 23

Figure 6.1. Electric Power Industry Employment ...................................................................................... 11

Figure 6.2. Coal Production Employment ................................................................................................. 12

Figure 6.3. Oil and Gas Production Employment ...................................................................................... 13
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

xii 

ACRONYMS

ACS American Cancer Society

AEO Annual Energy Outlook 

AQ Air quality 

ASM Annual Survey of Manufactures

ATSDR Agency for Toxic Substances and Disease Registry 

BACT Best Available Control Technology 

BenMAP Benefits Mapping and Analysis Program

BPT Benefit-per-Ton 

BSER Best System of Emissions Reduction 

Btu British Thermal Units 

C Celsius 

CAA Clean Air Act 

CAIR Clean Air Interstate Rule 

CCR Coal Combustion Residuals 

CCS Carbon Capture and Sequestration or Carbon Capture and Storage 

CCSP Climate Change Science Program 

CFR Code of Federal Regulations 

CH4 Methane 

CO Carbon Monoxide

CO2 Carbon Dioxide 

CRF Capital Recovery Factor 

CSAPR Cross State Air Pollution Rule 

CT Combustion Turbines 

CUA Climate Uncertainty Adder 

DICE Dynamic Integrated Climate and Economy Model 

DOE U.S. Department of Energy 

EAB Environmental Appeals Board 

EC Elemental carbon 

ECS Energy Cost Share

EG Emissions guidelines

EGR Enhanced Gas Recovery 

EGU Electric Generating Unit 

EIA U.S. Energy Information Administration 

EMM Electricity Market Module 

EO Executive Order 

EOR Enhanced Oil Recovery 

EPA U.S. Environmental Protection Agency 

ER Enhanced Recovery 

FERC Federal Energy Regulatory Commission 

FGD Flue Gas Desulfurization 

FOAK First of a Kind 

FOM Fixed Operating and Maintenance 

FR Federal Register 

FRCC Florida Reliability Coordinating Council 

FUND Framework for Uncertainty, Negotiation, and Distribution Model v 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

xiii 

GDP Gross Domestic Product 

GHG Greenhouse Gas 

GS Geologic Sequestration 

Gt Gigaton 

H2

S Hydrogen Sulfide 

HAP Hazardous air pollutant

HCl Hydrogen chloride

HFC Hydrofluorocarbons 

HIA Health impact assessment

IARC International Agency for Research on Cancer

IAM Integrated Assessment Model 

ICR Information Collection Request 

IGCC Integrated Gasification Combined Cycle 

IOU Investor Owned Utility 

IPCC Intergovernmental Panel on Climate Change 

IPM Integrated Planning Model 

IRIS Integrated Risk Information System

IRP Integrated Resource Plan 

ISA Integrated Science Assessment

kWh Kilowatt-hour 

lbs Pounds 

LCOE Levelized Cost of Electricity 

LML Lowest measured level

LNB Low NOX Burners 

MATS Mercury and Air Toxics Standards 

MEA Monoethanolamine 

MECSA Manufacturing Energy Consumption Survey 

MeHg Methylmercury

MGD Millions of Gallons per Day 

mg/L Milligrams per Liter 

mmBtu Million British Thermal Units 

MW Megawatt 

MWh Megawatt-hour 

N2

O Nitrous Oxide 

NAAQS National Ambient Air Quality Standards 

NAICS North American Industry Classification System

NaOH Sodium Hydroxide 

NATCARB National Carbon Sequestration Database and Geographic Information System 

NEEDS National Electric Energy Data System 

NEMS National Energy Modeling System 

NERC North American Electric Reliability Corporation 

NETL National Energy Technology Laboratory 

NGCC Natural Gas Combined Cycle 

NMMAPS National Morbidity, Mortality Air Pollution Study

NOAK Next of a Kind or Nth of a Kind 

NOX Nitrogen Oxide 

NRC National Research Council 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

xiv 

NSPS New Source Performance Standard 

NSR New Source Review 

NTTAA National Technology Transfer and Advancement Act 

OC Organic carbon

OFA Overfire Air 

OMB Office of Management and Budget 

PAGE Policy Analysis of the Greenhouse Gas Effect Model 

PFC Perfluorocarbons 

PM2.5 Fine Particulate Matter 

ppm Parts per Million 

PRA Paperwork Reduction Act 

PSD Prevention of Significant Deterioration 

RCSP Regional Carbon Sequestration Partnerships 

RADS Relative Airways Dysfunction Syndrome

RES Renewable Electricity Standards 

RFA Regulatory Flexibility Act 

RGGI Regional Greenhouse Gas Initiative 

RIA Regulatory Impact Analysis 

RPS Renewable Portfolio Standards 

SAB-CASAC Science Advisory Board Clean Air Scientific Advisory Committee

SAB-HES Science Advisory Board Health Effects Subcommittee of the Advisory Council on 

 Clean Air Compliance

SAB-EEAC Science Advisory Board Environmental Economics Advisory Committee 

SBA Small Business Administration

SBREFA Small Business Regulatory Enforcement Fairness Act 

SCC Social Cost of Carbon 

SCPC Super Critical Pulverized Coal 

SCR Selective Catalytic Reduction 

SF6 Sulfur Hexafluoride 

SIP State Implementation Plan 

SO2 Sulfur Dioxide 

Tcf Trillion Cubic Feet 

TDS Total Dissolved Solids 

TSD Technical Support Document 

TSM Transportation Storage and Monitoring 

UMRA Unfunded Mandates Reform Act 

U.S.C. U.S. Code 

USGCRP U.S. Global Change Research Program 

USGS U.S. Geological Survey 

USG SCC U.S. Government’s Social Cost of Carbon 

U.S. NRC U.S. Nuclear Regulatory Commission 

VCS Voluntary Consensus Standards 

VOC Volatile Organic Compounds

VOM Variable Operating and Maintenance 

VSL Value of a statistical life

WTP Willingness to pay
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

Draft Deliberative 

1 

EXECUTIVE SUMMARY 

This Regulatory Impact Analysis (RIA) discusses potential benefits, costs, and economic 

impacts of the proposed Emission Guidelines for Greenhouse Gas Emissions from Existing 

Stationary Sources: Electric Utility Generating Units (herein referred to EGU GHG Existing 

Source Guidelines). This RIA also discusses the potential benefits, costs and economic impacts 

of the proposed Standards of Performance for Greenhouse Gas Emissions from Reconstructed 

and Modified Stationary Sources (EGU GHG Reconstructed and Modified Source Standards). 

ES.1 Background and Context of Proposed EGU GHG Existing Source Guidelines 

Greenhouse gas pollution threatens Americans' health and welfare by leading to long 

lasting changes in our climate that can have a range of severely negative effects on human health 

and the environment. Carbon Dioxide (CO2) is the primary greenhouse gas pollutant, accounting 

for nearly three-quarters of global greenhouse gas emissions and 84 percent of U.S. greenhouse 

gas emissions. Fossil fuel-fired electric generating units (EGUs) are, by far, the largest emitters 

of GHGs, primarily in the form of CO2, among stationary sources in the U.S. 

In this action, the EPA is proposing emission guidelines for states to use in developing 

plans to address greenhouse gas emissions from existing fossil fuel-fired EGUs. Specifically, the 

EPA is proposing state-specific rate-based goals for carbon dioxide emissions from the power 

sector, as well as emission guidelines for states to use in developing plans to attain the statespecific goals. This rule, as proposed, would set in motion actions to lower the carbon dioxide 

emissions associated with existing power generation sources in the United States. 

ES.2 Summary of Proposed EGU GHG Existing Source Guidelines 

Under Clean Air Act (CAA) section 111(d), state plans must establish standards of 

performance that reflect the degree of emission limitation achievable through the application of 

the “best system of emission reduction” (BSER) that, taking into account the cost of achieving 

such reduction and any non-air quality health and environmental impact and energy 

requirements, the Administrator determines has been adequately demonstrated.1

 Consistent with 

 

1

 Under CAA sections 111(a)(1) and (d), the EPA is authorized to determine the BSER and to calculate the amount 

of emission reduction achievable through applying the BSER; and the state is authorized to identify the 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

Draft Deliberative 

2 

CAA section 111(d), this proposed rule contains state-specific goals that reflect the EPA’s 

calculation of the emission reductions that a state can achieve through the application of BSER. 

The EPA is using the following four building blocks to determine state-specific goals: 

1. Reducing the carbon intensity of generation at individual affected EGUs through heatrate improvements. 

2. Reducing emissions from the most carbon-intensive affected EGUs in the amount that 

results from substituting generation at those EGUs with generation from less carbonintensive affected EGUs (including natural gas combined cycle [NGCC] units that are 

under construction). 

3. Reducing emissions from affected EGUs in the amount that results from substituting 

generation at those EGUs with expanded low- or zero-carbon generation. 

4. Reducing emissions from affected EGUs in the amount that results from the use of 

demand-side energy efficiency that reduces the amount of generation required. 

The proposed rule also contains emission guidelines for states to use in developing plans 

that set their standards of performance. The EPA recognizes that each state has different policy 

considerations, including varying emission reduction opportunities and existing state programs 

and measures, and characteristics of the electricity system (e.g., utility regulatory structure, 

generation mix, electricity demand). The proposed emission guidelines provide states with 

options for establishing standards of performance in a manner that accommodates a diverse 

range of state approaches. The proposed guidelines would also allow states to collaborate and to 

demonstrate emission performance on a multi-state basis, in recognition of the fact that 

electricity is transmitted across state lines, and local measures often impact regional EGU CO2

emissions. 

While the EPA must establish BSER and is proposing goals and guidelines that reflect 

BSER, CAA section 111(d) also provides the EPA with the flexibility to design goals and 

guidelines that recognize, and are tailored to, the uniqueness and complexity of the power 

 standard(s) of performance that reflects that amount of emission reduction. In addition, the state is required to 

include in its state plan the standards of performance and measures to implement and enforce those standards. The 

state must submit the plan to the EPA, and the EPA must approve the plan if the standards of performance and 

implementing and enforcing measures are satisfactory. 

Deleted: cost-effective 

Comment [A1]: OMB: Please check to make sure 

this matches the preamble. 

EPA: Revised in 5/23 version to match new 

preamble language. 

Deleted: standards

Deleted: standards

Deleted: emission standard

Deleted: S

Deleted: S

Deleted: s

Deleted: s

Deleted: it
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generation sector and CO2 emissions. And, importantly, CAA section 111(d) allows the states 

flexibility in designing the measures for their state plans in response to EPA’s guidelines. States 

are not required to use each of the measures that the EPA determines constitute BSER, or use 

those measures to the same degree of stringency that the EPA determines is achievable at a 

reasonable cost; rather, CAA section 111(d) allows each state to determine the appropriate 

combination of, and the extent of its reliance on, measures for its state plan, by way of meeting 

its state-specific goal. Given the flexibilities afforded states in complying with the emission 

guidelines, the benefits, cost and economic impacts reported in this RIA are illustrative of 

compliance actions states may take. 

ES.3 Control Strategies for Existing EGUs 

States will ultimately determine approaches to comply with the goals established in this 

regulatory action. The EPA is proposing a BSER goal approach referred to as Option 1 and 

taking comment on a second approach referred to as Option 2. Each of these goal approaches use 

the four building blocks described above at different levels of stringency. Option 1 involves 

higher deployment of the four building blocks but allows a longer timeframe to comply (2030) 

whereas Option 2 has a lower deployment over a shorter timeframe (2025). 

Table ES-1 shows the proposed state goals for Options 1 and 2. This RIA depicts 

illustrative rate-based compliance scenarios for the goals set for Options 1 and 2, as well as a 

regional and state compliance approaches for each option. With the state compliance approach, 

states are assumed to comply with the guidelines by implementing measures solely within the 

state and emissions rate averaging occurs between affected sources on an intrastate basis 

only. In contrast under the regional approach, groups of states are assumed to collaboratively 

comply with the guidelines. States have the discretion of choosing between a regional or state 

compliance approach, and this RIA reports the economic consequences of compliance under two 

sets of assumptions: one that assumes all states individually take a rate-based compliance 

approach and the other that assumes certain groups of states take regional rate-based 

approaches. The analysis in the illustrative scenarios does not assume that states use any specific 

policy mechanism to achieve the state goals. There may be various policy mechanisms that result 

in the same distribution of emissions and electricity generation as in the IPM analysis of the 

illustrative scenarios. Alternative compliance approaches are also possible. For example, the 

Deleted: and cost-effective

Deleted: optimal 

Deleted: trading

Deleted: may

Deleted: of both approaches are reported in this 

RIA

Moved down [1]: The guidance allows flexibility 

of compliance, including the possibility of using a 

mass-based approach. 

Deleted: T

Moved (insertion) [1]
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guidance allows flexibility of compliance, including the possibility of using a mass-based 

approach. While IPM finds a least cost way to achieve the state goals to achieve the rate-based 

constraints imposed in the illustrative scenarios, there may be more cost effective approaches 

that the states may adopt to achieve their state goals. 

Table ES-1. Proposed State Goals (Adjusted MWh-Weighted-Average Pounds of CO2 per 

Net MWh from all Affected Fossil Fuel-Fired EGUs) for Options 1 and 2 

State2

Option 1 Option 2 

Interim Goal 

(2020-2029) 

Final Goal 

(2030 Forward) 

Interim Goal 

(2020-2024) 

Final Goal 

(2025 Forward) 

Alabama 1,147 1,059 1,270 1,237 

Alaska 1,105 1,017 1,175 1,138 

Arizona * 735 702 779 763 

Arkansas 968 910 1,083 1,058 

California 556 537 582 571 

Colorado 1,159 1,108 1,265 1,227 

Connecticut 597 540 651 627 

Delaware 913 841 1,007 983 

Florida 794 740 907 884 

Georgia 891 834 997 964 

Hawaii 1,378 1,306 1,446 1,417 

Idaho 244 228 261 254 

Illinois 1,366 1,271 1,501 1,457 

Indiana 1,607 1,531 1,715 1,683 

Iowa 1,341 1,301 1,436 1,417 

Kansas 1,578 1,499 1,678 1,625 

Kentucky 1,844 1,763 1,951 1,918 

Louisiana 948 883 1,052 1,025 

Maine 393 378 418 410 

Maryland 1,347 1,187 1,518 1,440 

Massachusetts 655 576 715 683 

Michigan 1,227 1,161 1,349 1,319 

Minnesota 911 873 1,018 999 

Mississippi 732 692 765 743 

Missouri 1,621 1,544 1,726 1,694 

Montana 1,882 1,771 2,007 1,960 

 

2

 The EPA has not developed goals for Vermont and the District of Columbia because current information indicates 

those jurisdictions have no affected EGUs. Also, as noted above, EPA is not proposing goals for tribes or U.S. 

territories at this time. 

Deleted: less costly

Comment [A2]: OMB: What does * denote? 

EPA: Replaced missing table note to explain *. 
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Nebraska 1,596 1,479 1,721 1,671 

Nevada 697 647 734 713 

New Hampshire 546 486 598 557 

New Jersey 647 531 722 676 

New Mexico * 1,107 1,048 1,214 1,176 

New York 635 549 736 697 

North Carolina 1,077 992 1,199 1,156 

North Dakota 1,817 1,783 1,882 1,870 

Ohio 1,452 1,338 1,588 1,545 

Oklahoma 931 895 1,019 986 

Oregon 407 372 450 420 

Pennsylvania 1,179 1,052 1,316 1,270 

Rhode Island 822 782 855 840 

South Carolina 840 772 930 897 

South Dakota 800 741 888 861 

Tennessee 1,254 1,163 1,363 1,326 

Texas 853 791 957 924 

Utah * 1,378 1,322 1,478 1,453 

Virginia 884 810 1,016 962 

Washington 264 215 312 284 

West Virginia 1,748 1,620 1,858 1,817 

Wisconsin 1,281 1,203 1,417 1,380 

Wyoming 1,808 1,714 1,907 1,869 

* Excludes EGUs located in Indian country. 

Table ES-2 shows the emission reductions associated with the compliance scenarios for the 

proposed Options 1 regional and state compliance approaches and Table ES-3 reports emission 

reductions associated with Option 2. In 2020, the EPA estimates that CO2 emissions will be 

reduced by 371 million metric tons under the regional compliance approach and by 383 million 

metric tons assuming a state specific compliance approach compared to base case levels. CO2

emission reductions for Option 1 increase to 545 and 555 million metric tons annually in 2030 

when compared to the base case emissions for Option 1 regional and state compliance 

approaches, respectively. Tables ES-2 and ES-3 also show emission reductions for criteria air 

pollutants. 

Deleted: ¶
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 Table ES-2. Summary of Climate and Air Pollutant Emission Reductions Options 11

CO2 (million 

metric tons) 

SO2 (thousands of 

tons) 

NOX (thousands of 

tons) 

PM2.5 (thousands 

of tons) 

2020 Regional Compliance Approach 

Base Case 2,161 1,476 1,559 212 

Proposed Guidelines 1,790 1,184 1,213 156

Emissions Change -371 -292 -345 -56 

2025 Regional Compliance Approach 

Base Case 2,231 1,515 1,587 209 

Proposed Guidelines 1,730 1,120 1,166 150 

Emissions Change -501 -395 -421 -59 

2030 Regional Compliance Approach 

Base Case 2,256 1,530 1,537 198 

Proposed Guidelines 1,711 1,106 1,131 144 

Emission Change -545 -424 -407 -54 

2020 State Compliance Approach 

Base Case 2,161 1,476 1,559 212 

Proposed Guidelines 1,777 1,140 1,191 154 

Emissions Change -383 -335 -367 -58 

2025 State Compliance Approach 

Base Case 2,231 1,515 1,587 209 

Proposed Guidelines 1,724 1,090 1,151 145 

Emission Change -506 -425 -436 -63 

2030 State Compliance Approach 

Base Case 2,256 1,530 1,537 198 

Proposed Guidelines 1,701 1,059 1,109 142 

Emissions Change -555 -471 -428 -56 

Source: Integrated Planning Model, 2014. N/A – not yet available 1 CO2 emission reductions are used to estimate the climate benefits of the guidelines. SO2, NOx, and directly emitted 

PM2.5 emission reductions are relevant for estimating air pollution health co-benefits of the proposed guidelines. 
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Table ES-3. Summary of Climate and Air Pollutant Emission Reductions Option 21

CO2 (million 

metric tons) 

SO2 (thousands 

of tons) 

NOX (thousands 

of tons) 

PM2.5 (thousands 

of tons) 

2020 Regional Compliance Approach 

Base Case 2,161 1,476 1,559 212 

Option 2 1,878 1,231 1,290 166 

Emissions Change -283 -244 -268 -46 

2025 Regional Compliance Approach 

Base Case 2,231 1,515 1,587 209 

Option 2 1,862 1,218 1,279 165 

Emissions Change -368 -297 -309 -44 

2030 Regional Compliance Approach 

Base Case 2,256 1,530 1,537 198 

Option 2 1,903 1,243 1,286 158 

Emissions Change -353 -287 -252 -40 

2020 State Compliance Approach 

Base Case 2,161 1,476 1,559 212 

Option 2 1,866 1,208 1,277 163 

Emissions Change -295 -267 -281 -49 

2025 State Compliance Approach 

Base Case 2,231 1,515 1,587 209 

Option 2 1,855 1,188 1,271 161 

Emissions Change -376 -327 -317 -48 

2030 State Compliance Approach 

Base Case 2,256 1,530 1,537 198 

Option 2 1,882 1,209 1,264 154 

Emissions Change -373 -321 -274 -44 

Source: Integrated Planning Model, 2014. N/A– not yet available. 

1 CO2 emission reductions are used to estimate the climate benefits of the guidelines. SO2, NOx, and directly emitted 

PM2.5 emission reductions are relevant for estimating air pollution health co-benefits of the guidelines. 

ES.4 Costs of Existing EGU Guidelines 

 The ‘‘compliance costs’’ of this proposed action are represented in this analysis as the 

change in electric power generation costs between the base case and illustrative compliance 

scenario policy cases in which states pursue a distinct set of strategies not limited to the 

technologies and measures included in the BSER to meet the EGU GHG emission guidelines, 

and include cost estimates for demand side energy efficiency. The compliance assumptions, and 

therefore the projected “compliance costs” set forth in this analysis, are illustrative in nature and 

do not represent the full suite of compliance flexibilities states may ultimately pursue. 

 The EPA projects that the annual incremental compliance cost of the proposed Option 1 

ranges from $5.4 to $7.4 billion in 2020 and from $7.3 to $8.8 billion in 2030 ($2011), excluding 
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the costs associated with monitoring, reporting, and recordkeeping. The estimated cost of Option 

2 is between $4.2 and $5.4 billion in 2020 and between $1.9 and $3.1 billion in 2030 (2011$). 

The estimated monitoring, reporting and recordkeeping costs for both options are $68.3 million 

in 2020, $8.9 million in 2025, and $8.9 million in 2030 (2011$). The annual incremental cost is 

the projected additional cost of complying with the proposed rule in the year analyzed and 

includes the net change in the annualized cost of capital investment in new generating sources 

and heat rate improvements at coal steam facilities,3 the change in the ongoing costs of operating 

pollution controls, shifts between or amongst various fuels, demand-side energy efficiency 

measures, and other actions associated with compliance. Costs for both options are reflected in 

Table ES-4 below and discussed more extensively in Chapter 3 of this RIA. 

Table ES-4. Summary of Illustrative Compliance Costs 

 Incremental Cost from Base Case (billions of 2011$) 

 2020 2025 2030 

Option 1 

State Compliance $7.4 $5.5 $8.8 

Regional Compliance $5.4 $4.6 $7.3 

Option 2 

State Compliance $5.4 $5.5 $3.1 

Regional Compliance $4.2 $4.5 $1.9 

Source: Integrated Planning Model, 2014. Compliance costs shown here do not include monitoring, reporting, and 

recordkeeping costs. 

The costs reported in Table ES-4 represent the estimated incremental electric utility 

generating costs changes from the base case, plus end-use energy efficiency program costs (paid 

by electric utilities) and end-use energy efficiency participant costs (paid by electric utility 

consumers). For example in 2020 for the proposed Option 1 regional compliance approach, enduse energy efficiency program costs are estimated to be $5.1 billion and end-use efficiency 

participant costs are $5.1 billion using a 3% discount rate. This estimate for end-use energy 

efficiency costs of $10.2 billion is combined with the costs generated by the Integrated Planning 

Model (IPM) that include the costs of states’ compliance with state goals associated with 

changes to reduce the carbon-intensity of electricity production and the energy demand 

decreases expected from end-use energy efficiency assumed in the illustrative scenarios. Thus 

the end-use energy efficiency costs are combined with the costs of reducing carbon-intensity of 

 

3

 See Chapter 8 of EPA’s Base Case using IPM (v5.13) documentation, available at: 

http://www.epa.gov/powersectormodeling/BaseCasev513.html 

Deleted: additional 
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production less the energy demand reductions due to end-use energy efficiency or by a net value 

derived by IPM of -$4.8 billion. The resulting compliance cost estimate of the rule considering 

all components is $5.4 billion ($10.2 billion - $4.8 billion) in 2020 for the Option 1 regional 

compliance approach. Note that when monitoring, reporting and recordkeeping costs of $68.3 

million are added to this estimate, compliance costs become $5.5 billion in 2020. The 

compliance costs reported in Table ES-4 are not social costs. These costs represent the 

illustrative real resources costs for states to comply with the BSER goals for Options 1 and 2. 

Electric sector compliance costs and monitoring, recordkeeping and reporting costs are compared 

to social benefits in Tables ES-8, ES-9 and ES-10 to derive illustrative net benefits of the 

guidelines. For a more extensive discussion of social costs, see Chapter 3 of this RIA. 

ES.5 Monetized Climate Benefits and Health Co-benefits for Existing EGUs 

Implementing the proposed guidelines is expected to reduce emissions of CO2 and have 

ancillary emission reductions (i.e., co-benefits) of SO2, NO2, and directly emitted PM2.5, which 

would lead to lower ambient concentrations of PM2.5 and ozone. The climate benefits estimates 

have been calculated using the estimated values of marginal climate impacts presented in the 

Technical Support Document: Technical Update of the Social Cost of Carbon for Regulatory 

Impact Analysis under Executive Order 12866, henceforth denoted as the 2013 SCC TSD.

4

 Also, 

the range of combined benefits reflects different concentration-response functions for the air 

pollution health co-benefits, but it does not capture the full range of uncertainty inherent in the 

health co-benefits estimates. Furthermore, we were unable to quantify or monetize all of the 

climate benefits and health and environmental co-benefits associated with the proposed emission 

guidelines, including reducing exposure to SO2, NOx, and hazardous air pollutants (e.g., mercury 

and hydrogen chloride), as well as ecosystem effects and visibility impairment. These 

unquantified benefits could be substantial, but it is difficult to approximate the potential 

magnitude of these unquantified benefits because previous quantification attempts have been 

 

4

 Technical Support Document: Technical Update of the Social Cost of Carbon for Regulatory Impact Analysis 

Under Executive Order 12866, Interagency Working Group on Social Cost of Carbon, with participation by 

Council of Economic Advisers, Council on Environmental Quality, Department of Agriculture, Department of 

Commerce, Department of Energy, Department of Transportation, Environmental Protection Agency, National 

Economic Council, Office of Energy and Climate Change, Office of Management and Budget, Office of Science 

and Technology Policy, and Department of Treasury (May 2013, Revised November 2013). Available at: 

http://www.whitehouse.gov/sites/default/files/omb/assets/inforeg/technical-update-social-cost-of-carbon-forregulator-impact-analysis.pdf 
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incomplete. The omission of these endpoints from the monetized results should not imply that 

the impacts are small or unimportant. Table ES-5 provides the list of the quantified and 

unquantified environmental and health benefits in this analysis. 
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Table ES-5. Quantified and Unquantified Benefits 

Benefits Category Specific Effect 

Effect Has 

Been 

Quantified

Effect Has 

Been 

Monetized

More Information 

Improved Environment 

Reduced climate 

effects 

Global climate impacts from CO2 —  SCC TSD 

Climate impacts from ozone and black carbon (directly 

emitted PM) — — Ozone ISA, PM ISA1

Other climate impacts (e.g., other GHGs such as methane, 

aerosols, other impacts) — — IPCC1

Improved Human Health (co-benefits) 

Reduced incidence of 

premature mortality 

from exposure to PM2.5

Adult premature mortality based on cohort study estimates

and expert elicitation estimates (age >25 or age >30)   PM ISA 

Infant mortality (age <1)   PM ISA 

Reduced incidence of 

morbidity from 

exposure to PM2.5

Non-fatal heart attacks (age > 18)   PM ISA 

Hospital admissions—respiratory (all ages)   PM ISA 

Hospital admissions—cardiovascular (age >20)   PM ISA 

Emergency room visits for asthma (all ages)   PM ISA 

Acute bronchitis (age 8-12)   PM ISA 

Lower respiratory symptoms (age 7-14)   PM ISA 

Upper respiratory symptoms (asthmatics age 9-11)   PM ISA 

Asthma exacerbation (asthmatics age 6-18)   PM ISA 

Lost work days (age 18-65)   PM ISA 

Minor restricted-activity days (age 18-65)   PM ISA 

Chronic Bronchitis (age >26) — — PM ISA 

Emergency room visits for cardiovascular effects (all ages) — — PM ISA1

Strokes and cerebrovascular disease (age 50-79) — — PM ISA1

Other cardiovascular effects (e.g., other ages) — — PM ISA2

Other respiratory effects (e.g., pulmonary function, nonasthma ER visits, non-bronchitis chronic diseases, other ages 

and populations) 

— — PM ISA2

Reproductive and developmental effects (e.g., low birth 

weight, pre-term births, etc) — — PM ISA2,3

Cancer, mutagenicity, and genotoxicity effects — — PM ISA2,3

Reduced incidence of 

mortality from 

exposure to ozone 

Premature mortality based on short-term study estimates (all 

ages)   Ozone ISA 

Premature mortality based on long-term study estimates (age 

30–99) — — Ozone ISA1

Reduced incidence of 

morbidity from 

exposure to ozone 

Hospital admissions—respiratory causes (age > 65)   Ozone ISA 

Hospital admissions—respiratory causes (age <2)   Ozone ISA 

Emergency department visits for asthma (all ages)   Ozone ISA 

Minor restricted-activity days (age 18–65)   Ozone ISA 

School absence days (age 5–17)   Ozone ISA 

Decreased outdoor worker productivity (age 18–65) — — Ozone ISA1

Other respiratory effects (e.g., premature aging of lungs) — — Ozone ISA2

Cardiovascular and nervous system effects — — Ozone ISA2

Reproductive and developmental effects — — Ozone ISA2,3

Reduced incidence of 

morbidity from 

exposure to NO2

Asthma hospital admissions (all ages) — — NO2 ISA1

Chronic lung disease hospital admissions (age > 65) — — NO2 ISA1

Respiratory emergency department visits (all ages) — — NO2 ISA1

Asthma exacerbation (asthmatics age 4–18) — — NO2 ISA1

Acute respiratory symptoms (age 7–14) — — NO2 ISA1

Premature mortality — — NO2 ISA1,2,3

Other respiratory effects (e.g., airway hyperresponsiveness 

and inflammation, lung function, other ages and populations) — — NO2 ISA2,3

Reduced incidence of 

morbidity from 

exposure to SO2

Respiratory hospital admissions (age > 65) — — SO2 ISA1

Asthma emergency department visits (all ages) — — SO2 ISA1

Asthma exacerbation (asthmatics age 4–12) — — SO2 ISA1
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Acute respiratory symptoms (age 7–14) — — SO2 ISA1

Premature mortality — — SO2 ISA1,2,3

Other respiratory effects (e.g., airway hyperresponsiveness 

and inflammation, lung function, other ages and populations) — — SO2 ISA1,2

Reduced incidence of 

morbidity from 

exposure to 

methylmercury 

Neurologic effects—IQ loss — — IRIS; NRC, 20001

Other neurologic effects (e.g., developmental delays, 

memory, behavior) — — IRIS; NRC, 20002

Cardiovascular effects — — IRIS; NRC, 20002,3

Genotoxic, immunologic, and other toxic effects — — IRIS; NRC, 20002,3

Reduced incidence of 

morbidity from 

exposure to HAP 

Effects associated with exposure to hydrogen chloride — — ATSDR, IRIS1,2

Improved Environment (co-benefits) 

Reduced visibility 

impairment 

Visibility in Class 1 areas — — PM ISA1

Visibility in residential areas — — PM ISA1

Reduced effects on 

materials 

Household soiling — — PM ISA1,2

Materials damage (e.g., corrosion, increased wear) — — PM ISA2

Reduced PM 

deposition (metals and 

organics) 

Effects on Individual organisms and ecosystems — — PM ISA2

Reduced vegetation 

and ecosystem effects 

from exposure to 

ozone 

Visible foliar injury on vegetation — — Ozone ISA1

Reduced vegetation growth and reproduction — — Ozone ISA1

Yield and quality of commercial forest products and crops — — Ozone ISA1

Damage to urban ornamental plants — — Ozone ISA2

Carbon sequestration in terrestrial ecosystems — — Ozone ISA1

Recreational demand associated with forest aesthetics — — Ozone ISA2

Other non-use effects Ozone ISA2

Ecosystem functions (e.g., water cycling, biogeochemical 

cycles, net primary productivity, leaf-gas exchange, 

community composition) 

— — Ozone ISA2

Reduced effects from 

acid deposition 

Recreational fishing — — NOx SOx ISA1

Tree mortality and decline — — NOx SOx ISA2

Commercial fishing and forestry effects — — NOx SOx ISA2

Recreational demand in terrestrial and aquatic ecosystems — — NOx SOx ISA2

Other non-use effects NOx SOx ISA2

Ecosystem functions (e.g., biogeochemical cycles) — — NOx SOx ISA2

Reduced effects from 

nutrient enrichment 

Species composition and biodiversity in terrestrial and 

estuarine ecosystems — — NOx SOx ISA2

Coastal eutrophication — — NOx SOx ISA2

Recreational demand in terrestrial and estuarine ecosystems — — NOx SOx ISA2

Other non-use effects NOx SOx ISA2

Ecosystem functions (e.g., biogeochemical cycles, fire 

regulation) — — NOx SOx ISA2

Reduced vegetation 

effects from exposure 

to SO2 and NOx

Injury to vegetation from SO2 exposure — — NOx SOx ISA2

Injury to vegetation from NOx exposure — — NOx SOx ISA2

Reduced ecosystem 

effects from exposure 

to methylmercury 

Effects on fish, birds, and mammals (e.g., reproductive 

effects) — — Mercury Study RTC2

Commercial, subsistence and recreational fishing — — Mercury Study RTC1

1

 We assess these co-benefits qualitatively due to data and resource limitations for this analysis, but we have quantified them in 

sensitivity analyses for other analyses. 2

 We assess these co-benefits qualitatively because we do not have sufficient confidence in available data or methods. 

3 We assess these co-benefits qualitatively because current evidence is only suggestive of causality or there are other significant 

concerns over the strength of the association. 
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ES.5.1 Estimating Global Climate Benefits 

We estimate the global social benefits of carbon dioxide (CO2) emission reductions 

expected from this rulemaking using the SCC estimates presented in the 2013 SCC TSD. We 

refer to these estimates, which were developed by the U.S. government, as “SCC estimates” for 

the remainder of this document. The SCC is a metric that estimates the monetary value of 

impacts associated with marginal changes in CO2 emissions in a given year. It includes a wide 

range of anticipated climate impacts, such as net changes in agricultural productivity and human 

health, property damage from increased flood risk, and changes in energy system costs, such as 

reduced costs for heating and increased costs for air conditioning. It is typically used to assess 

the avoided damages as a result of regulatory actions (i.e., benefits of rulemakings that have an 

incremental impact on cumulative global CO2 emissions). 

The SCC estimates used in this analysis have been developed over many years, using the 

best science available, and with input from the public. The EPA and other federal agencies have 

considered the extensive public comments on ways to improve SCC estimation received via the 

notice and comment period that was part of numerous rulemakings since 2006. In addition, 

OMB’s Office of Information and Regulatory Affairs recently sought public comment on the 

approach used to develop the SCC estimates. The comment period ended on February 26, 2014, 

and OMB is reviewing the comments received. 

An interagency process that included the EPA and other executive branch entities used 

three integrated assessment models (IAMs) to develop SCC estimates and selected four global 

values for use in regulatory analyses. The SCC estimates represent global measures because of 

the distinctive nature of the climate change problem. Emissions of greenhouse gases contribute 

to damages around the world, even when they are released in the United States, and the world’s 

economies are now highly interconnected. Therefore, the SCC estimates incorporate the 

worldwide damages caused by carbon dioxide emissions in order to reflect the global nature of 

the problem, and we expect other governments to consider the global consequences of their 

greenhouse gas emissions when setting their own domestic policies. See RIA Chapter 4 for more 

discussion. 
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The federal government first released the estimates in February 2010 and updated them in 

2013 using new versions of each IAM. The general approach to estimating the SCC values in 

2010 and 2013 was to run the three integrated assessment models (DICE, FUND, and PAGE)5

using the following three inputs in each model: a probabilistic distribution for climate sensitivity; 

five scenarios capturing economic, population, and emission trajectories; and constant annual 

discount rates. The 2010 SCC Technical Support Document (SCC TSD) provides a complete 

discussion of the methodology and the 2013 SCC TSD presents and discusses the updated 

estimates. The four SCC estimates, updated in 2013, are as follows: $13, $46, $68, and $137 per 

metric ton of CO2 emissions in the year 2020 (2011$), and each estimate increases over time. 

These SCC estimates are associated with different discount rates. The first three estimates are the 

model average at 5 percent discount rate, 3 percent, and 2.5 percent, respectively, and the fourth 

estimate is the 95th percentile at 3 percent. 

The 2010 SCC TSD noted a number of limitations to the SCC analysis, including the 

incomplete way in which the IAMs capture catastrophic and non-catastrophic impacts, their 

incomplete treatment of adaptation and technological change, uncertainty in the extrapolation of 

damages to high temperatures, and assumptions regarding risk aversion. Current integrated 

assessment models do not assign value to all of the important physical, ecological, and economic 

impacts of climate change recognized in the climate change literature because of a lack of 

precise information on the nature of damages and because the science incorporated into these 

models understandably lags behind the most recent research. In particular, the IPCC Fourth 

Assessment Report concluded that “It is very likely that [SCC estimates] underestimate the 

damage costs because they cannot include many non-quantifiable impacts.” Nonetheless, these 

estimates and the discussion of their limitations represent the best available information about 

the social benefits of CO2 emission reductions to inform the benefit-cost analysis. 

ES 5.2 Estimating Air Pollution Health Co-Benefits 

The proposed guidelines would reduce emissions of precursor pollutants (e.g., SO2, NOx, 

and directly emitted particles), which in turn would lower ambient concentrations of PM2.5 and 

ozone. This co-benefits analysis quantifies the monetized benefits associated with the reduced 

 

5

 The full models names are as follows: Dynamic Integrated Climate and Economy (DICE); Climate Framework for 

Uncertainty, Negotiation, and Distribution (FUND); and Policy Analysis of the Greenhouse Gas Effect (PAGE). 

Deleted: integrated assessment models 
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exposure to these two pollutants.6

 Unlike the global SCC estimates, the air pollution health cobenefits are only estimated for the contiguous U.S.7

 The estimates of monetized PM2.5 cobenefits include avoided premature deaths (derived from effect coefficients in two cohort studies 

[Krewski et al. 2009 and Lepeule et al. 2012] for adults and one for infants [Woodruff et al. 

1997]), as well as avoided morbidity effects for ten non-fatal endpoints ranging in severity from 

lower respiratory symptoms to heart attacks (U.S. EPA, 2012). The estimates of monetized 

ozone co-benefits include avoided premature deaths (derived from the range of effect 

coefficients represented by two short-term epidemiology studies [Bell et al. (2004) and Levy et 

al. (2005)]), as well as avoided morbidity effects for five non-fatal endpoints ranging in severity 

from school absence days to hospital admissions (U.S. EPA, 2008, 2011). 

We used a “benefit-per-ton” approach to estimate the health co-benefits. To create the 

benefit-per-ton estimates for PM2.5, this approach uses an air quality model to convert emissions 

of PM2.5 precursors (e.g., SO2, NOx) and directly emitted particles into changes in ambient PM2.5 

concentrations and BenMAP to estimate the changes in human health associated with that 

change in air quality. We then divide these health impacts by the emissions in specific sectors at 

the regional level (i.e., East, West, and California). We followed a similar process to estimate 

benefit-per-ton estimates for the ozone precursor NOx. To calculate the co-benefits for the 

proposed guidelines, we then multiplied the regional benefit-per-ton estimates for the EGU 

sector by the corresponding emission reductions. All benefit-per-ton estimates reflect the 

geographic distribution of the modeled emissions, which may not exactly match the emission 

reductions in this rulemaking, and thus they may not reflect the local variability in population 

density, meteorology, exposure, baseline health incidence rates, or other local factors for any 

specific location. 

Our estimate of the monetized co-benefits is based on EPA’s interpretation of the best 

available scientific literature (U.S. EPA, 2009) and methods and supported by EPA’s Science 

Advisory Board and the NAS (NRC, 2002). Below are key assumptions underlying the estimates 

 

6

 We were unable to estimate the co-benefits associated with reducing direct exposure to SO2 and NOx. 

7

 We do not have emission reduction information or air quality modeling available to estimate the air pollution 

health co-benefits in Alaska and Hawaii anticipated from implementation of the proposed guidelines. 

Comment [A3]: OMB: Please explain briefly 

why this was not possible. Further, can EPA add a 

commitment to do air quality modeling for the final 

RIA. 

EPA: Given the structure of 111(d) and the focus on 

climate benefits, we believe that the benefit-per-ton 

analysis that we have conducted to estimate the air 

pollution health co-benefits is appropriate. 

However, we recognize that more precise air quality 

modeling can be informative. 
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for PM2.5-related premature mortality, which accounts for 98 percent of the monetized PM2.5

health co-benefits: 

1. We assume that all fine particles, regardless of their chemical composition, are 

equally potent in causing premature mortality. This is an important assumption, 

because PM2.5 varies considerably in composition across sources, but the scientific 

evidence is not yet sufficient to allow differentiation of effect estimates by particle 

type. The PM ISA concluded that “many constituents of PM2.5 can be linked with 

multiple health effects, and the evidence is not yet sufficient to allow differentiation 

of those constituents or sources that are more closely related to specific outcomes” 

(U.S. EPA, 2009b). 

2. We assume that the health impact function for fine particles is log-linear without a 

threshold in this analysis. Thus, the estimates include health co-benefits from 

reducing fine particles in areas with varied concentrations of PM2.5, including both 

areas that do not meet the fine particle standard and those areas that are in attainment, 

down to the lowest modeled concentrations. 

3. We assume that there is a “cessation” lag between the change in PM exposures and 

the total realization of changes in mortality effects. Specifically, we assume that some 

of the incidences of premature mortality related to PM2.5 exposures occur in a 

distributed fashion over the 20 years following exposure based on the advice of the 

SAB-HES (U.S. EPA-SAB, 2004c), which affects the valuation of mortality cobenefits at different discount rates. 

Every benefits analysis examining the potential effects of a change in environmental 

protection requirements is limited, to some extent, by data gaps, model capabilities (such as 

geographic coverage) and uncertainties in the underlying scientific and economic studies used to 

configure the benefit and cost models. Despite these uncertainties, we believe this analysis 

provides a reasonable indication of the expected health co-benefits of the air pollution emission 

reductions for the illustrative compliance options for the proposed standards under a set of 

reasonable assumptions. This analysis does not include the type of detailed uncertainty 

assessment found in the 2012 PM2.5 National Ambient Air Quality Standard (NAAQS) RIA (U.S. 

EPA, 2012) because we lack the necessary air quality input and monitoring data to conduct a 

complete benefits assessment. In addition, using a benefit-per-ton approach adds another 

important source of uncertainty to the benefits estimates. 
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ES 5.3 Combined Benefits Estimates 

The EPA has evaluated the range of potential impacts by combining all four SCC values 

with health co-benefits values at the 3 percent and 7 percent discount rates. Different discount 

rates are applied to SCC than to the health co-benefit estimates; because CO2 emissions are longlived and subsequent damages occur over many years. Moreover, several discount rates are 

applied to SCC because the literature shows that the estimate of SCC is sensitive to assumptions 

about discount rate and because no consensus exists on the appropriate rate to use in an 

intergenerational context. The U.S. government centered its attention on the average SCC at a 3 

percent discount rate but emphasized the importance of considering all four SCC estimates. 

Tables ES-6 and ES-7 provide the combined climate benefits and health co-benefits for each 

option evaluated for 2020, 2025 and 2030 for Options 1 and 2, respectively for each discount rate 

combination. 
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Table ES-6. Combined Estimates of Climate Benefits and Health Co-Benefits for Proposed 

Existing EGU GHG Rule – Regional Compliance Approach (billions of 2011$)* 

Option SCC Discount Rate and 

Statistic** 

Climate 

Benefits 

Only 

Climate Benefits plus Health Co-Benefits 

(Discount Rate Applied to Health Co-Benefits) 

3% 7% 

Option 1 In 2020 371 million metric tonnes CO2

5% $4.7 $21 to $42 $19 to $39 

3% $17 $33 to $54 $32 to $51 

2.5% $25 $41 to $63 $40 to $59 

3% (95th percentile) $51 $67 to $88 $65 to $85 

In 2025 501 million metric tonnes CO2 

5% $7.5 $30 to $61 $28 to $56 

3% $25 $48 to $78 $46 to $74 

2.5% $37 $60 to $90 $57 to $85 

3% (95th percentile) $76 $99 to $130 $97 to $120 

In 2030 545 million metric tonnes CO2

5% $9.3 $35 to $68 $32 to $63 

3% $30 $55 to $89 $53 to $84 

2.5% $44 $69 to $100 $66 to $97 

3% (95th percentile) $92 $120 to $150 $120 to $150 

Option 2 In 2020 283 million metric tonnes CO2

5% $3.6 $17 to $34 $16 to $32 

3% $13 $26 to $44 $25 to $41 

2.5% $19 $33 to $50 $31 to $47 

3% (95th percentile) $39 $52 to $70 $51 to $67 

In 2025 368 million metric tonnes CO2

5% $5.5 $23 to $46 $21 to $42 

3% $18 $36 to $59 $34 to $55 

2.5% $27 $44 to $67 $43 to $64 

3% (95th percentile) $56 $73 to $96 $72 to $93 

In 2030 353 million metric tonnes CO2 

5% $6.0 $23 to $46 $21 to $42 

3% $20 $37 to $59 $35 to $56 

2.5% $28 $45 to $68 $44 to $64 

3% (95th percentile) $60 $77 to $100 $75 to $96 

*All estimates are rounded to two significant figures. Climate benefits are based on reductions in CO2 emissions. 

Co-benefits are based on regional benefit-per-ton estimates. Ozone co-benefits occur in analysis year, so they are 

the same for all discount rates. The health co-benefits reflect the sum of the PM2.5 and ozone co-benefits and 

reflect the range based on adult mortality functions (e.g., from Krewski et al. (2009) with Bell et al. (2004) to 

Lepeule et al. (2012) with Levy et al. (2005)). The monetized health co-benefits do not include reduced health 

effects from direct exposure to NO2, SO2, and HAP; ecosystem effects; or visibility impairment. See chapter 4 

for more information about these estimates and regarding the uncertainty in these estimates. 

**Unless otherwise specified, it is the model average. 
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Table ES-7. Combined Estimates of Climate Benefits and Health Co-Benefits for Proposed 

Existing EGU GHG Rule – State Compliance Approach (billions of 2011$)* 

Option SCC Discount Rate and 

Statistic** 

Climate 

Benefits 

Only 

Climate Benefits plus Health Co-Benefits 

(Discount Rate Applied to Health Co-Benefits) 

3% 7% 

Option 

1 

In 2020 383 million metric tonnes CO2

5% $4.9 $22 to $45 $20 to $41 

3% $18 $35 to $57 $33 to $54 

2.5% $26 $43 to $66 $42 to $62 

3% (95th percentile) $52 $69 to $92 $68 to $88 

In 2025 506 million metric tonnes CO2 

5% $7.6 $31 to $62 $29 to $57 

3% $25 $49 to $80 $46 to $75 

2.5% $37 $61 to $92 $58 to $87 

3% (95th percentile) $77 $100 to $130 $98 to $130 

In 2030 555 million metric tonnes CO2

5% $9.5 $36 to $72 $34 to $66 

3% $31 $57 to $93 $55 to $87 

2.5% $44 $71 to $110 $69 to $100 

3% (95th percentile) $94 $120 to $160 $120 to $150 

Option 

2 

In 2020 295 million metric tonnes CO2

5% $3.8 $17 to $35 $16 to $32 

3% $14 $27 to $45 $26 to $42 

2.5% $20 $34 to $52 $32 to $49 

3% (95th percentile) $40 $54 to $72 $53 to $69 

In 2025 376 million metric tonnes CO2

5% $5.6 $23 to $47 $22 to $43 

3% $19 $36 to $60 $35 to $56 

2.5% $28 $45 to $69 $44 to $65 

3% (95th percentile) $57 $75 to $98 $73 to $95 

In 2030 373 million metric tonnes CO2 

5% $6.4 $24 to $48 $23 to $44 

3% $21 $39 to $63 $37 to $59 

2.5% $30 $48 to $72 $46 to $68 

3% (95th percentile) $63 $81 to $110 $80 to $100 

*All estimates are rounded to two significant figures. Climate benefits are based on reductions in CO2 emissions. 

Co-benefits are based on regional benefit-per-ton estimates. Ozone co-benefits occur in analysis year, so they are 

the same for all discount rates. The health co-benefits reflect the sum of the PM2.5 and ozone co-benefits and 

reflect the range based on adult mortality functions (e.g., from Krewski et al. (2009) with Bell et al. (2004) to 

Lepeule et al. (2012) with Levy et al. (2005)). The monetized health co-benefits do not include reduced health 

effects from direct exposure to NO2, SO2, and HAP; ecosystem effects; or visibility impairment. See chapter 4 

for more information about these estimates and regarding the uncertainty in these estimates. 

**Unless otherwise specified, it is the model average. 
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ES.6 Monetized Benefits, Compliance Costs and Net Benefits of the Proposed Guidelines 

for Existing Sources 

In this summary, the EPA provides the estimates of the climate benefits, health co-benefits, 

compliance costs and net benefits of the proposed Option 1 and alternative Option 2 assuming a 

regional compliance approach and an alternative state compliance approach. In Table ES-8, the 

EPA estimates that in 2020 the proposed Option 1 regional compliance approach will yield 

monetized climate benefits of $17 billion using a 3 percent discount rate (model average, 2011$). 

The air pollution health co-benefits in 2020 are estimated to be $15 billion to $34 billion (2011$) 

for a 3 percent discount rate and $13 billion to $31 billion (2011$) for a 7 percent discount rate. 

The annual compliance costs, including monitoring and reporting costs, are approximately $5.5 

billion (2011$) in 2020. The quantified net benefits (the difference between monetized benefits 

and costs) are $26 billion to $45 billion (2011$) for 2020 (Table ES-8 below) and $47 billion to 

$78 billion (2011$) for 2030 (Table ES-10 below), using a 3 percent discount rate (model 

average). For the Option 1 state compliance approach in 2020, the EPA estimates monetized 

climate benefits of approximately $18 billion using a 3 percent discount rate (model average). 

The air pollution health co-benefits in 2020 are estimated to be $15 billion to $36 billion for a 3 

percent discount rate and $14 billion to $33 billion (2011$) for a 7 percent discount rate. The 

annual compliance costs including monitoring and reporting costs, are approximately $7.5 billion 

(2011$) in 2020. The quantified net benefits (the difference between monetized benefits and 

costs) are $26 billion to $46 billion for 2020 (Table ES-8 below) and $47 billion to $80 billion 

(2011$) for 2030 (Table ES-10 below), Benefit and cost estimates for Options 1 and 2 regional 

and state compliance approaches for 2020, 2025, and 2030 are presented in Tables ES-8, ES-9, 

and ES-10. 

The EPA could not monetize some important benefits of the guidelines. Unquantified 

benefits include climate benefits from reducing emissions of non-CO2 greenhouse gases and cobenefits from reducing exposure to SO2, NOx, and hazardous air pollutants (e.g., mercury and 

hydrogen chloride), as well as ecosystem effects and visibility impairment. Upon considering 

these limitations and uncertainties, it remains clear that the benefits of this proposal are 

substantial and far outweigh the costs. 
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Table ES-8. Summary of Estimated Monetized Benefits, Compliance Costs, and Net 

Benefits for the Proposed Guidelines – 2020 (billions of 2011$) a

Option 1 - state Option 2 – state 

3% Discount 

Rate 

7% Discount 

Rate 

3% Discount 

Rate 

7% Discount 

Rate 

Climate Benefits b 

5% discount rate 

3% discount rate 

2.5% discount rate 

95th percentile at 3% discount rate 

$4.9 

$18 

$26 

$52 

$3.8 

$14 

$20 

$40 

Air pollution health co-benefits c $17 to $40 $15 to $36 $14 to $32 $12 to $29 

Total Compliance Costs d $7.5 $5.5 

Net Benefits e $27 to $50 $26 to $46 $22 to $40 $20 to $37 

Non-Monetized Benefits 

Direct exposure to SO2 and NO2

1.5 tons of Hg 

Ecosystem Effects 

Visibility impairment 

Direct exposure to SO2 and NO2

1.2 tons of Hg 

Ecosystem Effects 

Visibility impairment 

Option 1 - regional Option 2 – regional 

3% Discount 

Rate 

7% Discount 

Rate 

3% Discount 

Rate 

7% Discount 

Rate 

Climate Benefits b

5% discount rate 

3% discount rate 

2.5% discount rate 

95th percentile at 3% discount rate 

$4.7 

$17 

$25 

$51 

$3.6 

$13 

$19 

$39 

Air pollution health co-benefits c $16 to $37 $15 to $34 $13 to $31 $12 to $28 

Total Compliance Costs d $5.5 $4.3 

Net Benefits e $28 to $49 $26 to $45 $22 to $40 $21 to $37 

Non-Monetized Benefits 

Direct exposure to SO2 and NO2

1.3 tons of Hg 

Ecosystem effects 

Visibility impairment 

Direct exposure to SO2 and NO2

0.9 tons of Hg 

Ecosystem effects 

Visibility impairment a

 All estimates are for 2020 and are rounded to two significant figures, so figures may not sum. 

b

 The climate benefit estimates in this summary table reflect global impacts from CO2 emission changes and do not 

account for changes in non-CO2 GHG emissions. Also, different discount rates are applied to SCC than to the other 

estimates because CO2 emissions are long-lived and subsequent damages occur over many years. The SCC 

estimates are year-specific and increase over time. 

c The air pollution health co-benefits reflect reduced exposure to PM2.5 and ozone associated with emission 

reductions of directly emitted PM2.5, SO2 and NOX. The range reflects the use of concentration-response functions 

from different epidemiology studies. The reduction in premature fatalities each year accounts for over 90 percent of 

total monetized co-benefits from PM2.5 and ozone. These models assume that all fine particles, regardless of their 

Deleted: E

Deleted: E
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chemical composition, are equally potent in causing premature mortality because the scientific evidence is not yet 

sufficient to allow differentiation of effect estimates by particle type. 

d Total social costs are approximated by the illustrative compliance costs which, in part, are estimated using the 

Integrated Planning Model for the proposed option and a discount rate of approximately 5%. This estimate also 

includes monitoring, recordkeeping, and reporting costs and demand side energy efficiency program and 

participant costs. 

e

 The estimates of net benefits in this summary table are calculated using the global SCC at a 3 percent discount rate 

(model average). The RIA includes combined climate and health estimates based on these additional discount rates. 

Table ES-9. Summary of Estimated Monetized Benefits, Compliance Costs, and Net 

Benefits for the Proposed Guidelines – 2025 (billions of 2011$) a

Option 1 – state Option 2 – state 

3% Discount 

Rate 

7% Discount 

Rate 

3% Discount 

Rate 

7% Discount 

Rate 

Climate Benefits b 

5% discount rate 

3% discount rate 

2.5% discount rate 

95th percentile at 3% discount rate 

$7.6 

$25 

$37 

$77 

$5.6 

$19 

$28 

$57 

Air pollution health co-benefits c $23 to $54 $21 to $49 $18 to $41 $16 to $37 

Total Compliance Costs d $5.5 $5.5 

Net Benefits e $43to $74 $41 to $69 $31 to $55 $29 to $51 

Non-Monetized Benefits 

Direct exposure to SO2 and NO2

2.0 tons of Hg 

Ecosystem Effects 

Visibility impairment 

Direct exposure to SO2 and NO2

1.7 tons of Hg 

Ecosystem Effects 

Visibility impairment 

Option 1 – regional Option 2 – regional 

3% Discount 

Rate 

7% Discount 

Rate 

3% Discount 

Rate 

7% Discount 

Rate 

Climate Benefits b

5% discount rate 

3% discount rate 

2.5% discount rate 

95th percentile at 3% discount rate 

$7.5 

$25 

$37 

$76 

$5.5 

$18 

$27 

$56 

Air pollution health co-benefits c $23 to $53 $21 to $48 $17 to $40 $16 to $36 

Total Compliance Costs d $4.6 $4.5 

Net Benefits e $43 to $74 $41 to $69 $31 to $54 $29 to $50 

Non-Monetized Benefits 

Direct exposure to SO2 and NO2

1.7 tons of Hg 

Ecosystem effects 

Visibility impairment 

Direct exposure to SO2 and NO2

1.3 tons of Hg 

Ecosystem effects 

Visibility impairment a

 All estimates are for 2025 and are rounded to two significant figures, so figures may not sum. 

Deleted: E

Deleted: E
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b

 The climate benefit estimates in this summary table reflect global impacts from CO2 emission changes and do not 

account for changes in non-CO2 GHG emissions. Also, different discount rates are applied to SCC than to the other 

estimates because CO2 emissions are long-lived and subsequent damages occur over many years. The SCC 

estimates are year-specific and increase over time. 

c The air pollution health co-benefits reflect reduced exposure to PM2.5 and ozone associated with emission 

reductions of directly emitted PM2.5, SO2 and NOX. The range reflects the use of concentration-response functions 

from different epidemiology studies. The reduction in premature fatalities each year accounts for over 90 percent of 

total monetized co-benefits from PM2.5 and ozone. These models assume that all fine particles, regardless of their 

chemical composition, are equally potent in causing premature mortality because the scientific evidence is not yet 

sufficient to allow differentiation of effect estimates by particle type. 

d Total social costs are approximated by the illustrative compliance costs which, in part, are estimated using the 

Integrated Planning Model for the proposed option and a discount rate of approximately 5%. This estimate also 

includes monitoring, recordkeeping, and reporting costs and demand side energy efficiency program and 

participant costs. 

e

 The estimates of net benefits in this summary table are calculated using the global SCC at a 3 percent discount rate 

(model average). The RIA includes combined climate and health estimates based on these additional discount rates. 

Table ES-10. Summary of Estimated Monetized Benefits, Compliance Costs, and Net 

Benefits for the Proposed Guidelines –2030 (billions of 2011$) a

Option 1 – state Option 2 – state 

3% Discount 

Rate 

7% Discount 

Rate 

3% Discount 

Rate 

7% Discount 

Rate 

Climate Benefits b 

5% discount rate 

3% discount rate 

2.5% discount rate 

95th percentile at 3% discount rate 

$9.5 

$31 

$44 

$94 

$6.4 

$21 

$30 

$63 

Air pollution health co-benefits c $27 to $62 $24 to $56 $18 to $42 $16 to $38 

Total Compliance Costs d $8.8 $3.1 

Net Benefits e $49 to $84 $46 to $79 $36 to $60 $34 to $56 

Non-Monetized Benefits 

Direct exposure to SO2 and NO2

2.1 tons of Hg and 590 tons of HCl 

Ecosystem Effects 

Visibility impairment 

Direct exposure to SO2 and NO2

1.5 tons of Hg and 130 tons of HCl 

Ecosystem Effects 

Visibility impairment 

Option 1 – regional Option 2 – regional 

3% Discount 

Rate 

7% Discount 

Rate 

3% Discount 

Rate 

7% Discount 

Rate 

Climate Benefits b

5% discount rate 

3% discount rate 

2.5% discount rate 

95th percentile at 3% discount rate 

$9.3 

$30 

$44 

$92 

$6.0 

$20 

$28 

$60 

Air pollution health co-benefits c $25 to $59 $23 to $54 $17 to $40 $15 to $36 

Deleted: ¶
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Total Compliance Costs d $7.3 $1.9 

Net Benefits e $48 to $82 $46 to $77 $35 to $57 $33 to $54 

Non-Monetized Benefits 

Direct exposure to SO2 and NO2

1.7 tons of Hg and 580 tons of HCl 

Ecosystem effects 

Visibility impairment 

Direct exposure to SO2 and NO2

1.1 tons of Hg and 30 tons of HCl 

Ecosystem effects 

Visibility impairment a

 All estimates are for 2030, and are rounded to two significant figures, so figures may not sum. 

b

 The climate benefit estimates in this summary table reflect global impacts from CO2 emission changes and do not 

account for changes in non-CO2 GHG emissions. Also, different discount rates are applied to SCC than to the other 

estimates because CO2 emissions are long-lived and subsequent damages occur over many years. The SCC 

estimates are year-specific and increase over time. 

c The air pollution health co-benefits reflect reduced exposure to PM2.5 and ozone associated with emission 

reductions of directly emitted PM2.5, SO2 and NOX. The range reflects the use of concentration-response functions 

from different epidemiology studies. The reduction in premature fatalities each year accounts for over 90 percent of 

total monetized co-benefits from PM2.5 and ozone. These models assume that all fine particles, regardless of their 

chemical composition, are equally potent in causing premature mortality because the scientific evidence is not yet 

sufficient to allow differentiation of effect estimates by particle type. 

d Total social costs are approximated by the illustrative compliance costs which, in part, are estimated using the 

Integrated Planning Model for the proposed option and a discount rate of approximately 5%. This estimate also

includes monitoring, recordkeeping, and reporting costs and demand side energy efficiency program and 

participant costs. 

e

 The estimates of net benefits in this summary table are calculated using the global SCC at a 3 percent discount rate 

(model average). The RIA includes combined climate and health estimates based on these additional discount rates. 

ES.7 Economic Impacts of the Proposed Emission Guidelines for Existing EGUs 

The proposed guidelines have important energy market implications. Under Option 1, 

average nationwide retail electricity prices are projected to increase roughly 6 to 7 percent in 

2020, and roughly 3 percent in 2030 (contiguous U.S.), compared to base case price estimates 

modeled for these same years. Average monthly electricity bills are anticipated to increase by 

roughly 3 percent in 2020, but decline by roughly 9 percent by 2030 because increased energy 

efficiency will lead to reduced usage. 

The average delivered coal price to the power sector is projected to decrease by 16 to 17 

percent in 2020 and roughly 18 percent in 2030, relative to the base case (Option 1). The EPA 

projects coal production for use by the power sector, a large component of total coal production, 

will decline by roughly 25 to 27 percent in 2020 from base case levels. The use of coal by the 

power sector will decrease by roughly 30 to 32 percent in 2030.

The EPA also projects that the electric power sector-delivered natural gas prices will 

increase by 9 to 12 percent in 2020, with negligible changes by 2030 relative to the base case. 

Deleted: E

Deleted: E

Moved (insertion) [2]
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Natural gas use for electricity generation will increase by as much as 1.2 trillion cubic feet (TCF) 

in 2020 relative to the base case, declining over time. 

Renewable energy capacity is anticipated to increase by roughly 12 GW in 2020 and by 9 

GW in 2030 under Option 1. Energy market impacts from the guidelines are discussed more 

extensively in Chapter 3 of this RIA. 

ES.8 Economic Impacts of the Proposed Guidelines for Existing EGUs in Sectors Other 

Than the EGU Sector and Employment Impacts 

Changes in supply or demand for electricity, natural gas, coal, can impact markets for 

goods and services produced by sectors that use these energy inputs in the production process or 

supply those sectors. Changes in cost of production may result in changes in price, changes in 

quantity produced, and consequently changes in profitability of firms affected and the effect on 

their consumers. EPA recognizes that these guidelines provide significant flexibilities and states 

implementing the guidelines may choose to mitigate impacts to some markets outside the EGU 

sector. Similarly, demand for new generation or energy efficiency can result in changes in 

production and profitability for firms that supply those goods and services and the guidelines 

provide flexibility for states that may want to enhance demand for goods and services from those 

sectors. 

Executive Order 13563 directs federal agencies to consider the effect of regulations on job 

creation and employment. According to the Executive Order, “our regulatory system must 

protect public health, welfare, safety, and our environment while promoting economic growth, 

innovation, competitiveness, and job creation. It must be based on the best available science” 

(Executive Order 13563, 2011). Although standard benefit-cost analyses have not typically 

included a separate analysis of regulation-induced employment impacts, during periods of 

sustained high unemployment, employment impacts are of particular concern and questions may 

arise about their existence and magnitude. 

States have the responsibility and flexibility to implement policies and practices for 

compliance with Proposed Electric Generating Unit Greenhouse Gas Existing Source Guidelines. 

Given the wide range of approaches that may be used, quantifying the associated employment 

Moved up [2]: The EPA projects coal production 

for use by the power sector, a large component of 

total coal production, will decline by roughly 25 to 

27 percent in 2020 from base case levels. The use of 

coal by the power sector will decrease by roughly 30 

to 32 percent in 2030.

Deleted: c

Deleted: price
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impacts is difficult. EPA’s illustrative employment analysis includes an estimate of projected 

employment impacts associated with these guidelines for the electric power industry, coal and 

natural gas production, and demand side energy efficiency activities. These projections are 

derived, in part, from a detailed model of the electricity production sector used for this regulatory 

analysis, and U.S government data on employment and labor productivity. In the electricity, coal, 

and natural gas sectors, the EPA estimates that these guidelines could result in an increase of 

approximately 28,000 to 25,900 job-years in 2020 for Option 1, state and regional compliance 

approaches, respectively. For Option 2, the state and regional compliance approach estimates 

both an increase of approximately 29,800 to 26,700 job-years in 2020. Demand-side energy 

efficiency employment impacts may range from an increase of approximately 78,800 jobs in 

2020 for Option 1 for both state and regional compliance approaches. For Option 2 demand-side 

energy efficiency employment impacts are an increase of approximately 57,000 jobs in 2020 for 

state and regional compliance approaches. More detail about these analyses can be found in 

Chapter 7 of this RIA. 

ES.9 Modified and Reconstructed Sources 

The EPA is proposing emission limits for CO2 emitted from reconstructed and modified 

EGUs under section 111(b) of the CAA. Based on historical information that has been reported 

to the EPA, the EPA anticipates few, if any, covered units will trigger the reconstruction or 

modification provisions in the period of analysis (through 2025). As a result, we do not 

anticipate any significant costs or benefits associated with this proposal. However, because there 

have been a few units that have notified EPA of modifications in the past, in chapter 9 of this 

RIA we present an illustrative analysis of the costs and benefits for a hypothetical unit if it were 

to trigger the modification provision. 

 

Deleted: have 

Comment [A4]: OMB: The quantitative EE job 

estimates are extremely uncertain and we suggest 

they be dropped here and in the RIA and be replaced 

by a qualitative discussion. 

EPA: EPA believes that it has appropriately included 

analysis quantifying end-use energy efficiency jobs 

in the RIA. Since end-use energy efficiency 

expenditures are such a large component of the 

rulemaking, the EPA feels it would be remiss not to 

attempt to quantify their employment impact. EPA 

feels it has made the best projection possible given 

the official data and methods available. The EPA 

also feels it has provided the reader with extensive 

caveats about the approach, and solicited comment 

regarding other methods or data sources. 
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ES.10 References 

Bell, M.L., et al. 2004. “Ozone and Short-Term Mortality in 95 U.S. Urban Communities, 1987-

2000.” Journal of the American Medical Association, 292(19): pp. 2372-8. 

Docket ID EPA-HQ-OAR-2009-0472-114577, Technical Support Document: Social Cost of 

Carbon for Regulatory Impact Analysis Under Executive Order 12866, Interagency Working 

Group on Social Cost of Carbon, with participation by the Council of Economic Advisers, 

Council on Environmental Quality, Department of Agriculture, Department of Commerce, 

Department of Energy, Department of Transportation, Environmental Protection Agency, 

National Economic Council, Office of Energy and Climate Change, Office of Management 

and Budget, Office of Science and Technology Policy, and Department of Treasury (February 

2010). Available at: <http://www.whitehouse.gov/sites/default/files/omb/inforeg/foragencies/Social-Cost-of-Carbon-for-RIA.pdf>. 

Docket ID EPA-HQ-OAR-2013-0495, Technical Support Document: Technical Update of the 

Social Cost of Carbon for Regulatory Impact Analysis Under Executive Order 12866, 

Interagency Working Group on Social Cost of Carbon, with participation by the Council of 

Economic Advisers, Council on Environmental Quality, Department of Agriculture, 

Department of Commerce, Department of Energy, Department of Transportation, 

Environmental Protection Agency, National Economic Council, Office of Energy and Climate 

Change, Office of Management and Budget, Office of Science and Technology Policy, and 

Department of Treasury (May 2013, Revised November 2013). Also available at: 

<http://www.whitehouse.gov/sites/default/files/omb/assets/inforeg/technical-update-socialcost-of-carbon-for-regulator-impact-analysis.pdf>. 

Fann, N.; K.R. Baker and C.M. Fulcher. 2012. “Characterizing the PM2.5-Related Health 

Benefits of Emission Reductions for 17 Industrial, Area and Mobile Emission Sectors Across 

the U.S.” Environment International, 49 41–151. 

Krewski D; M. Jerrett; R.T. Burnett; R. Ma; E. Hughes and Y. Shi, et al. 2009. Extended FollowUp and Spatial Analysis of the American Cancer Society Study Linking Particulate Air 

Pollution and Mortality. HEI Research Report, 140, Health Effects Institute, Boston, MA. 

Intergovernmental Panel on Climate Change. 2007. Climate Change 2007: Synthesis Report 

Contribution of Working Groups I, II and III to the Fourth Assessment Report of the IPCC. 

Available at: 

<http://www.ipcc.ch/publications_and_data/publications_ipcc_fourth_assessment_report_synt

hesis_report.htm>. 
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Lepeule, J.; F. Laden; D. Dockery and J. Schwartz. 2012. “Chronic Exposure to Fine Particles 

and Mortality: An Extended Follow-Up of the Harvard Six Cities Study from 1974 to 2009.” 

Environmental Health Perspectives, July, 120(7): pp. 965-70. 

Levy, J.I.; S.M. Chemerynski and J.A. Sarnat. 2005. “Ozone Exposure and Mortality: An 

Empiric Bayes Meta-regression Analysis.” Epidemiology, 16(4): pp. 458-68. 

National Research Council (NRC). 2000. Toxicological Effects of Methylmercury: Committee 

on the Toxicological Effects of Methylmercury. Board on Environmental Studies and 

Toxicology. Washington, DC: National Academies Press. 

National Research Council (NRC). 2002. Estimating the Public Health Benefits of Proposed Air 

Pollution Regulations. Washington, DC: National Academies Press. 

U.S. Environmental Protection Agency (U.S. EPA). 2008a. Integrated Science Assessment for 

Sulfur Oxides: Health Criteria (Final Report). Research Triangle Park, NC: National Center 

for Environmental Assessment, September. Available at 

<http://cfpub.epa.gov/ncea/cfm/recordisplay.cfm?deid=198843>. 

U.S. EPA. 2008b. Final Ozone NAAQS Regulatory Impact Analysis. Research Triangle Park, 

NC: Office of Air Quality Planning and Standards, Health and Environmental Impacts 

Division, Air Benefit and Cost Group. (EPA document number EPA-452/R-08-003, March). 

Available at <http://cfpub.epa.gov/ncea/cfm/recordisplay.cfm?deid=194645>. 

U.S. EPA. 2008c. Integrated Science Assessment for Oxides of Nitrogen: Health Criteria (Final 

Report). Research Triangle Park, NC: National Center for Environmental Assessment. July. 

Available at <http://www.epa.gov/ttnecas1/regdata/RIAs/6-ozoneriachapter6.pdf>. 

U.S. EPA. 2008d. Integrated Science Assessment for Oxides of Nitrogen and Sulfur: Ecological 

Criteria National (Final Report). Research Triangle Park, NC: National Center for 

Environmental Assessment. (EPA document number EPA/600/R-08/139, December). 

Available at <http://cfpub.epa.gov/ncea/cfm/recordisplay.cfm?deid=201485>. 

U.S. EPA. 2009. Integrated Science Assessment for Particulate Matter (Final Report). Research 

Triangle Park, NC: National Center for Environmental Assessment, RTP Division. (EPA 

document number EPA-600-R-08-139F, December). Available at 

<http://cfpub.epa.gov/ncea/cfm/recordisplay.cfm?deid=216546>. 

U.S. EPA. 2010d. Section 3: Re‐analysis of the Benefits of Attaining Alternative Ozone 

Standards to Incorporate Current Methods. Available at 

<http://www.epa.gov/ttnecas1/regdata/RIAs/s3-supplemental_analysis-updated_benefits11-

5.09.pdf >. 
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U.S. EPA. 2012a. Regulatory Impact Analysis for the Final Revisions to the National Ambient 

Air Quality Standards for Particulate Matter. Research Triangle Park, NC: Office of Air 

Quality Planning and Standards, Health and Environmental Impacts Division. (EPA document 

number EPA-452/R-12-003, December). Available at 

<http://www.epa.gov/pm/2012/finalria.pdf>. 

U.S. EPA. 2013b. Integrated Science Assessment of Ozone and Related Photochemical Oxidants 

(Final Report). Washington, DC: U.S. Environmental Protection Agency. (EPA document 

number EPA/600/R-10/076F). Available at 

<http://cfpub.epa.gov/ncea/isa/recordisplay.cfm?deid=247492#Download>. 

Woodruff, T.J.; J. Grillo and K.C. Schoendorf. 1997. “The Relationship Between Selected 

Causes of Postneonatal Infant Mortality and Particulate Air Pollution in the United States,” 

Environmental Health Perspectives, 105 (6): 608-612. 
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CHAPTER 1: INTRODUCTION AND BACKGROUND 

1.1 Introduction 

This document presents the expected benefits, costs, and economic impacts of illustrative 

strategies states may implement to comply with the proposed Electric Utility Generating Unit 

(EGU) Existing Source GHG Guidelines in 2020, 2025, and 2030. Furthermore, this document 

provides a separate description of the expected benefits, costs, and economic impacts of 

proposed emission limits for reconstructed and modified EGU sources. This chapter contains 

background information on these rules and an outline of the chapters in the report. 

1.2 Legal, Scientific and Economic Basis for this Rulemaking 

1.2.1 Statutory Requirement 

Section 111 of the Clean Air Act (CAA) requires performance standards for air pollutant 

emissions from categories of stationary sources that may reasonably contribute to endangerment 

of public health or welfare. In April 2007, the Supreme Court ruled in Massachusetts v. the 

Environmental Protection Agency (EPA) that greenhouse gases (GHGs) meet the definition of an 

“air pollutant” under the CAA. This ruling clarified that the authorities and requirements of the 

CAA apply to GHGs. As a result, the EPA must make decisions about whether to regulate GHGs 

under certain provisions of the CAA, based on relevant statutory criteria. The EPA issued a final 

determination that GHG emissions endanger both the public health and the public welfare of 

current and future generations in the Endangerment and Cause or Contribute Findings for 

Greenhouse Gases Under Section 202(a) of the CAA (74 FR 66,496; Dec. 15, 2009). 

Section 111(b) authorizes the EPA to issue new source performance standards (NSPS) for 

carbon dioxide (CO2) from newly constructed, reconstructed, and modified sources. In January 

2014, under the authority of CAA section 111(b), the EPA proposed standards for emissions of 

CO2 from newly constructed fossil fuel-fired electric steam generating units (utility boilers and 

integrated gasification combined cycle [IGCC] units) and for natural gas-fired stationary 

combustion turbines. The EPA is currently proposing standards to address CO2 emissions from 

reconstructed and modified power plants under the authority of CAA section 111(b). 

Deleted: existing

Deleted: In a separate action,
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Furthermore, when the EPA establishes section 111(b) standards of performance for newly 

constructed sources in a particular source category for a pollutant that is not regulated as a 

criteria pollutant or hazardous air pollutant, the EPA must establish requirements for existing 

sources in that source category for that pollutant under section 111(d). Under 111(d), the EPA 

develops “emission guidelines” that the states must develop plans to meet. The EPA is proposing 

state goals for GHG emissions from existing sources under section 111(d) of the CAA. 

1.2.2 Health and Welfare Impacts from Climate Change 

In 2009, the EPA Administrator found that elevated concentrations of greenhouse gases in 

the atmosphere may reasonably be anticipated both to endanger public health and to endanger 

public welfare. These adverse impacts make it necessary for the EPA to regulate GHGs from 

EGU sources. This proposed rule is designed to reduce the rate at which atmospheric 

concentrations of these gases are increasing, and therefore reduce the risk of adverse effects. 

Climate change threatens public health in a number of ways. Heat is already the leading 

cause of weather-related deaths in the United States. In the future, severe heat waves are 

projected to intensify in magnitude and duration over the portions of the U.S. where these events 

have already been observed. If observed warming continues as projected, it will increase heatrelated mortality and illness, especially among the elderly, young, and frail. There is also a 

relationship between climate change and other aspects of air quality. Climate change is expected 

to increase regional ozone pollution compared to the expected ozone levels in the absence of 

climate change. These increases are expected to increase associated risks for respiratory illnesses 

and premature death. 

In addition to impacts on heat-related mortality and air quality, there is also the potential 

for increased deaths, injuries, infectious diseases, stress-related disorders, and other adverse 

effects associated with social disruption and migration from more frequent extreme weather 

events. Climate change can also impact the spread of vector-borne diseases. 

There are multiple pathways by which greenhouse gas emissions and the resultant climate 

change affect climate-sensitive economic sectors and the environment. These sectors include 

agriculture, forestry, water resources, sea level rise and coastal areas, energy, infrastructure, 

settlements, and ecosystems and wildlife. For example, changes in the intensity and frequency of 

Deleted: W

Deleted: In this action, t

Comment [A5]: Need to update based on 

language from ch. 4. 
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extreme weather events, such as droughts and heavy storms, have the potential to cause serious 

negative impacts on U.S. agriculture. Additionally, climate change will likely further constrain 

already over-allocated water resources in some regions of the United States, increasing 

competition among agricultural, municipal, industrial, and ecological uses. Furthermore, climate 

change impacts in other regions of the world could raise national security concerns for the 

United States. 

The specific health and welfare impacts of climate change are addressed in more detail in 

Chapter 4 of this Regulatory Impact Assessment (RIA). 

1.2.3 Market Failure 

Many regulations are promulgated to correct market failures, which lead to a suboptimal 

allocation of resources within the free market. Air quality and pollution control regulations 

address “negative externalities” whereby the market does not internalize the full opportunity cost 

of production borne by society as public goods such as air quality are unpriced. 

 GHG emissions impose costs on society, such as negative health and welfare impacts that 

are not reflected in the market price of the goods produced through the polluting process. For this 

regulatory action the good produced is electricity. These social costs associated with the health 

and welfare impacts are referred to as negative externalities. If an electricity producer pollutes 

the atmosphere when it generates electricity, this cost will be borne not by the polluting firm but 

by society as a whole. The market price of electricity will fail to incorporate the full opportunity 

cost to society of generating electricity. All else equal, given this externality, the quantity of 

electricity generated in a free market will not be at the socially optimal level. More electricity 

will be produced than would occur if the power producers had to account for the full opportunity 

cost of production including the negative externality. Consequently, absent a regulation on 

emissions, the marginal social cost of the last unit of electricity produced will exceed its 

marginal social benefit. 

1.3 Summary of Regulatory Analysis 

In accordance with Executive Order 12866, Executive Order 13563, and the EPA’s 

“Guidelines for Preparing Economic Analyses,” the EPA prepared this RIA for this “significant 

regulatory action.” This action is an economically significant regulatory action because it is 

Deleted: In this case,
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expected to have an annual effect on the economy of $100 million or more or adversely affect in 

a material way the economy, a sector of the economy, productivity, competition, jobs, the 

environment, public health or safety, or state, local, or tribal governments or communities. 

This RIA addresses the potential costs, emission reductions, and benefits of the existing 

source emission guidelines that are the focus of this action. Additionally, this RIA includes 

information on potential impacts on electricity markets, employment, and markets outside the 

electricity sector. Chapter 9 of this document provides a separate description of the expected 

benefits, costs and economic impacts of proposed emission limits for reconstructed and modified 

EGU sources. 

1.4 Background for the Proposed EGU Existing Source GHG Guidelines 

1.4.1 Base Case and Years of Analysis 

The rule on which the majority of the analysis in this RIA is based proposes GHG 

emission guidelines for states to limit CO2 emissions from certain existing EGUs. The base case 

for this analysis, which uses the Integrated Planning Model (IPM), includes state rules that have 

been finalized and/or approved by a state’s legislature or environmental agencies, as well as final 

federal rules. The IPM Base Case v.5.13 includes the Clean Air Interstate Rule (CAIR),8

 the 

Mercury and Air Toxics Rule (MATS), and other state and Federal regulations to the extent that 

they contain measures, permits, or other air-related limitations or requirements. Additional 

legally binding and enforceable commitments for GHG reductions considered in the base case 

are discussed in the documentation for IPM.9

 

Costs and benefits are presented for compliance in 2020, 2025, and 2030. These years were 

selected because they represent partial and full implementation dates for the two policy options 

analyzed. Analysis of employment impacts is presented for compliance in 2020, 2025, and 2030. 

All estimates are presented in 2011 dollars. 

 

8 EPA Base Case v.5.13 includes the Clean Air Interstate Rule (CAIR), a Federal regulatory measure for achieving the 1997 National Ambient Air Quality Standards (NAAQS) 

for ozone (8-hour average of 0.08 ppm) and fine particles (24-hour average of 65 μg/m3 or less and annual average of 15 μg/m3 for particles of diameter 2.5 micrometers or 

less, i.e., PM2.5). Originally issued on March 10, 2005, CAIR was remanded back to EPA by the U.S. Court of Appeals for the District of Columbia Circuit in December 

2008 and EPA was required to correct legal flaws in the regulations that had been cited in a ruling by the Court in July 2008. CAIR remains in effect until replaced by EPA 

pursuant to the Court’s ruling. CAIR’s provisions were still in effect when EPA Base Case v.5.13 was released. 

9 See Chapter 3 of EPA’s Base Case using IPM (v5.13) documentation, available at: http://www.epa.gov/powersectormodeling/BaseCasev513.html 
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1.4.2 Definition of Affected Sources 

This proposed rule under CAA section 111(d) will set emission guidelines for states to 

limit CO2 emissions from certain existing EGUs. This rulemaking does not address GHG 

emissions from newly constructed sources or sources modifying or reconstructing. Section 

111(b) emission limits for reconstructed and modified sources are being proposed in a separate 

action and are discussed in Chapter 9 of this RIA. 

For the purposes of this proposed rule, an affected EGU is any fossil fuel-fired EGU that 

was in operation or had commenced construction as of January 8, 2014, and is therefore an 

“existing source” for purposes of CAA section 111, but in all other respects would meet the 

applicability criteria for coverage under the proposed GHG standards for newly constructed

fossil fuel-fired EGUs published in the Federal Register on that date. The proposed GHG 

standards for newly constructed EGUs generally define an affected EGU as any boiler, IGCC, or 

combustion turbine (in either simple cycle or combined cycle configuration) that (1) is capable of 

combusting at least 250 million British thermal units (Btu) per hour; (2) combusts fossil fuel for 

more than 10 percent of its total annual heat input; (3) sells the greater of 219,000 MWh per year 

or one-third of its potential electrical output to a utility distribution system; and (4) was not in 

operation or under construction as of January 8, 2014 (the date the proposed GHG standards of 

performance for newly constructed EGUs were published in the Federal Register). The minimum 

fossil fuel consumption condition applies over any consecutive three-year period (or as long as 

the unit has been in operation, if less). The minimum electricity sales condition applies over 

rolling three-year periods (or as long as the unit has been in operation, if less). 

1.4.3 Regulated Pollutant 

This rule sets emission guidelines for CO2 emissions from affected sources. The EPA is 

proposing these guidelines because CO2 is a GHG and fossil fuel-fired power plants are the 

country’s largest stationary source emitters of GHGs. In 2009, the EPA found that by causing or 

contributing to climate change, GHGs endanger both the public health and the public welfare of 

current and future generations.10

 

10 Endangerment and Cause or Contribute Findings for Greenhouse Gases under Section 202(a) of the Clean Air 

Act.

Deleted: , reconstructed, or modified sources.

Deleted: analysis
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The EPA is aware that other GHGs such as nitrous oxide (N2O) (and to a lesser extent, 

methane [CH4]) may be emitted from fossil-fuel-fired EGUs, especially from coal-fired 

circulating fluidized bed combustors and from units with selective catalytic reduction and 

selective non-catalytic reduction systems installed for nitrogen oxide (NOX) control. The EPA is 

not proposing separate N2O or CH4 guidelines or an equivalent CO2 emission limit because of a 

lack of available data for these affected sources. Additional information on the quantity and 

significance of emissions and on the availability of controls of reasonable cost would be needed 

before proposing standards for these pollutants. 

1.4.4 Emission Guidelines 

The EPA is proposing emission guidelines for states to use in developing plans to address 

greenhouse gas emissions from existing fossil fuel-fired electric generating units. Specifically, 

the EPA is proposing state-specific rate-based goals for CO2 emissions from the power sector, as 

well as guidelines for states to follow in developing plans to attain the state-specific goals. 

(These state-based goals can be found in the preamble and Chapter 3 of this RIA.) The proposed 

emission guidelines provide states with options for establishing standards of performance in a 

manner that accommodates a diverse range of state approaches. The proposed guidelines would 

also allow states to collaborate and to demonstrate compliance on a multi-state basis, in 

recognition of the fact that electricity is transmitted across state lines, and measures often impact 

regional EGU CO2 emissions. The illustrative compliance strategies presented in this RIA 

include both regional and state-level compliance scenarios for each of the regulatory options 

presented. 

1.5 Organization of the Regulatory Impact Analysis 

This report presents the EPA’s analysis of the potential benefits, costs, and other economic 

effects of the proposed EGU Existing Source GHG Guidelines to fulfill the requirements of an 

RIA. This RIA includes the following chapters: 

 Chapter 2, Electric Power Sector Profile 

 Chapter 3, Control Strategies, Cost, Economic, and Energy Impacts 

 Chapter 4, Estimated Climate Benefits and Health Co-benefits 

 Chapter 5, Economic Impacts – Markets Outside the Electricity Sector 

Deleted: cost effective 

Deleted: carbon dioxide

Deleted: targets

Deleted: meeting

Deleted: standards 

Deleted: emission performance
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 Chapter 6, Employment 

 Chapter 7, Statutory and Executive Order Analyses 

 Chapter 8, Summary of Benefits and Cost of the Proposed Regulation 

 Chapter 9, Benefits, Costs, and Economic Impacts of Standards of Performance for 

Modified and Reconstructed Electric Generating Units 

 
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1.6 References 

40 CFR Chapter I [EPA–HQ–OAR–2009–0171; FRL–9091–8] RIN 2060–ZA14, 

“Endangerment and Cause or Contribute Findings for Greenhouse Gases under Section 202(a) 

of the Clean Air Act,” Federal Register / Vol. 74, No. 239 / Tuesday, December 15, 2009 / 

Rules and Regulations. 

U.S. Environmental Protection Agency. Power Sector Modeling Platform v.5.13. November 27, 

2013. Available online at: http://www.epa.gov/powersectormodeling/BaseCasev513.html. 
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CHAPTER 2: ELECTRIC POWER SECTOR PROFILE 

2.1 Introduction 

This chapter discusses important aspects of the power sector that relate to the proposed 

EGU Existing Source GHG Standards, including the types of power-sector sources affected by 

the proposal, and provides background on the power sector and EGUs. In addition, this chapter 

provides some historical background on the EPA regulation of, and future projections for, the 

power sector. 

2.2 Power Sector Overview 

The production and delivery of electricity to customers consists of three distinct segments: 

generation, transmission, and distribution. 

2.2.1 Generation 

Electricity generation is the first process in the delivery of electricity to consumers. Most 

of the existing capacity for generating electricity does so by creating heat to create high pressure 

steam that is released to rotate turbines which, in turn, create electricity. The existing power 

sector consists of over 18,000 generating units, comprising fossil-fuel-fired units, nuclear units, 

and hydroelectric and other renewable sources dispersed throughout the country (see Table 2-1). 

Table 2-1. Existing Electricity Generating Capacity by 

Energy Source, 2012

Energy Source 

Number of 

Generators 

Generator 

Nameplate 

Capacity (MW) 

Net Summer 

Capacity 

(MW) 

Net Winter 

Capacity 

(MW) 

Coal 1,309 336,341 309,680 312,293 

Petroleum 3,702 53,789 47,167 51,239 

Natural Gas 5,726 485,957 422,364 455,214 

Other Gases 94 2,253 1,946 1,933 

Nuclear 104 107,938 101,885 104,182 

Hydroelectric Conventional 4,023 78,241 78,738 78,215 

Wind 947 59,629 59,075 59,082 

Solar Thermal and Photovoltaic 553 3,215 3,170 3,053 

Wood and Wood-Derived Fuels 351 8,520 7,508 7,570 

Geothermal 197 3,724 2,592 2,782 

Other Biomass 1,766 5,527 4,811 4,885 

Hydroelectric Pumped Storage 156 20,858 22,368 22,271 

Other Energy Sources 95 2,005 1,729 1,739 

Comment [A6]: I know this is a late change, but 

maybe change title to more clearly capture 

information in section 2.5? I know it is a mouthful, 

but perhaps 

“Electricity Power Sector Profile and Methods to 

Improve GHG Performance of Existing Sources” 

CAMD response: the section 2.5 on methods to 

improve GHG performance was added here in 

response to earlier comments to help the reader 

understand this chapter better. It is much more 

thoroughly covered in Chapter 3. We do not think 

this topic should be elevated in importance in this 

chapter to being in the title. 

Comment [A7]: The January 2014 111(b) RIA 

had a lengthy discussion about recent proposed and 

finalized environmental regulations affecting the 

electricity sector. It was a nice discussion. It is my 

understanding that an updated version of that text is 

somewhere in the 111(d) preamble. It would be 

helpful to reference it here at the least given the 

importance of those rulemakings to the state of the 

sector. 

CAMD response: the section in this chapter was 

directly taken from the 111(b) RIA chapter, tailored 

as necessary for only those relevant issues to the 

111(d) guidance. At this time in sufficient time 

available to work through this in detail to make sure 

everything relevant was carried forward (and 

nothing not relevant was left in). This can be 

addressed again for the final rule 

Deleted: ¶

Page Break
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Total 19,023 1,167,995 1,063,033 1,104,459 

Source: Table 4.3, EIA Electric Power Annual, 2013a 

Note: This table presents generation capacity. Actual net generation is presented in Table 2-3. 

In 2012, electric generating sources produced net 3,890 billion kWh to meet electricity 

demand. Roughly 70 percent of this electricity was produced through the combustion of fossil 

fuels, primarily coal and natural gas, with coal accounting for the largest single share. 

 

Table 2-2. Electricity Net Generation in 2012 (billion kWh) 

Net Generation 

(Billion kWh) 

Fuel Source 

Share 

Coal 1,500.6 38.57% 

Petroleum 20.1 0.52% 

Natural Gas 1,132.8 29.12% 

Other Gases 3.0 0.08%

Nuclear 769.3 19.78% 

Hydroelectric 268.9 6.91% 

Other 195.7 5.03% 

Total 3,890 100% 

Source: Tables 3.2.A and 3.3.A, EIA Electric Power Annual, 2013a 

Note: Excludes generation from commercial and industrial sectors. Retail sales are not equal to net generation 

because net generation includes net exported electricity and loss of electricity that occurs through transmission and 

distribution. 

These electric generating sources provide electricity for commercial, industrial, and 

residential uses, each of which consumes roughly a quarter to a third of the total electricity 

produced (see Table 2-3). Some of these uses are highly variable, such as heating and air 

conditioning in residential and commercial buildings, while others are relatively constant, such 

as industrial processes that operate 24 hours a day. 

 Table 2-3. Total U.S. Electric Power Industry Retail Sales in 2012 (billion kWh) 

   

Sales/Direct 

Use (Billion 

kWh) 

Share of 

Total End 

Use 

Retail Sales 

Residential 1,375 35.87% 

Commercial 1,327 34.63% 

Industrial 986 25.72% 

Transportation 7.3 0.19% 

Direct Use 138 3.59% 

Total End Use 3,832 100% 
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 Source: Table 2.2, EIA Electric Power Annual, 2013a 

Coal-fired generating units have historically supplied “base-load” electricity, the portion of 

electricity loads which are continually present, and typically operate throughout the day. Along 

with nuclear generation, these coal units meet the part of demand that is relatively constant. 

Although much of the coal fleet operates as base load, there can be notable differences across 

various facilities (see Table 2-4). For example, coal-fired units less than 100 megawatts (MW) in 

size compose 32 percent of the total number of coal-fired units, but only 4 percent of total coalfired capacity. Gas-fired generation is better able to vary output and is the primary option used to 

meet the variable portion of the electricity load and has historically supplied “peak” and 

“intermediate” power, when there is increased demand for electricity (for example, when 

businesses operate throughout the day or when people return home from work and run appliances 

and heating/air-conditioning), versus late at night or very early in the morning, when demand for 

electricity is reduced. 

The evolving economics of the power sector, in particular the increased natural gas supply 

and subsequent relatively low natural gas prices, have resulted in more gas being utilized as base 

load energy in addition to supplying electricity during peak load. Projections of changes in 

capacity and the impact of this rule on the future need for construction of new generation 

capacity sources are discussed in more detail in Chapter 3 of this RIA. 

Table 2-4. Coal Steam Electricity Generating Units in 2015, by Size, Age, Capacity, and 

Thermal Efficiency (Heat Rate) 

Unit Size 

Grouping (MW) No. Units % of All Units Avg. Age 

Avg. Net 

Summer 

Capacity 

(MW) 

Total Net 

Summer 

Capacity 

(MW) 

% Total 

Capacity 

Avg. Heat 

Rate 

(Btu/kWh) 

0 To 25 133 14% 46 14 

 

1,837 1% 11,860 

>25 To 49 74 8% 38 37.5 2,775 1% 12,113 

50 To 99 94 10% 44 72.0 6,765 2% 11,910 

100 To 149 75 8% 49 124.4 9,329 3% 10,977 

150 To 249 128 14% 47 91.3 24,492 9% 10,646 

250 and up 432 46% 36 536.7 231,874 84% 10,336 

Totals 1,266 316,480 

Source: National Electric Energy Data System (NEEDS) v.5.13 

Deleted: 1

Deleted: 

Comment [A8]: Something goofy with the 

alignment. 

fixed 
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Note: The average heat rate reported is the mean of the heat rate of the units in each size category (as opposed to a 

generation-weighted or capacity-weighted average heat rate.) A lower heat rate indicates a higher level of fuel 

efficiency. Table is limited to coal-steam units online in 2013 or earlier, and excludes those units with planned 

retirements. 

The locations of existing fossil units in NEEDS v.5.13 are shown in Figure 2.1. 

Figure 2-1. Fossil Fuel-Fired Electricity Generating Facilities, by Size 

Source: National Electric Energy Data System (NEEDS) v.5.13 

Note: This map displays fossil capacity at facilities in the NEEDS v.5.13 IPM frame. NEEDS reflects available 

fossil capacity on-line by the end of 2015. This includes planned new builds and planned retirements. In areas with a 

dense concentration of facilities, some facilities may be obscured. 

2.2.2 Transmission 

Transmission is the term used to describe the movement of electricity over a network of 

high voltage lines, from electric generators to substations where power is stepped down for local 

distribution. In the U.S. and Canada, there are three separate interconnected networks of high 
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6 

voltage transmission lines,11 each operating synchronously. Within each of these transmission 

networks, there are multiple areas where the operation of power plants is monitored and 

controlled to ensure that electricity generation and load are kept in balance. In some areas, the 

operation of the transmission system is under the control of a single regional operator; in others, 

individual utilities coordinate the operations of their generation, transmission, and distribution 

systems to balance their common generation and load needs. 

2.2.3 Distribution 

Distribution of electricity involves networks of lower voltage lines and substations that 

take the higher voltage power from the transmission system and step it down to lower voltage 

levels to match the needs of customers. The transmission and distribution system is the classic 

example of a natural monopoly, in part because it is not practical to have more than one set of 

lines running from the electricity generating sources to substations or from substations to 

residences and businesses. 

Transmission has generally been developed by the larger vertically integrated utilities that 

typically operate generation and distribution networks. Often distribution is handled by a large 

number of utilities that purchase and sell electricity, but do not generate it. Over the last couple 

of decades, several jurisdictions in the United States began restructuring the power industry to 

separate transmission and distribution from generation, ownership, and operation. As discussed 

below, electricity restructuring has focused primarily on efforts to reorganize the industry to 

encourage competition in the generation segment of the industry, including ensuring open access 

of generation to the transmission and distribution services needed to deliver power to consumers. 

In many states, such efforts have also included separating generation assets from transmission 

and distribution assets to form distinct economic entities. Transmission and distribution remain 

price-regulated throughout the country based on the cost of service. 

 

11 These three network interconnections are the western US and Canada, corresponding approximately to the area 

west of the Rocky Mountains; eastern US and Canada, not including most of Texas; and a third network 

operating in most of Texas. These are commonly referred to as the Western Interconnect Region, Eastern 

Interconnect Region, and ERCOT, respectively. 
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2.3 Deregulation and Restructuring 

The process of restructuring and deregulation of wholesale and retail electric markets has 

changed the structure of the electric power industry. In addition to reorganizing asset 

management between companies, restructuring sought a functional unbundling of the generation, 

transmission, distribution, and ancillary services the power sector has historically provided, with 

the aim of enhancing competition in the generation segment of the industry. 

Beginning in the 1970s, government policy shifted against traditional regulatory 

approaches and in favor of deregulation for many important industries, including transportation 

(notably commercial airlines), communications, and energy, which were all thought to be natural 

monopolies (prior to 1970) that warranted governmental control of pricing. However, 

deregulation efforts in the power sector were most active during the 1990s. Some of the primary 

drivers for deregulation of electric power included the desire for more efficient investment 

choices, the economic incentive to provide least-cost electric rates through market competition, 

reduced costs of combustion turbine technology that opened the door for more companies to sell 

power with smaller investments, and complexity of monitoring utilities’ cost of service and 

establishing cost-based rates for various customer classes. 

The pace of restructuring in the electric power industry slowed significantly in response to 

market volatility in California and financial turmoil associated with bankruptcy filings of key 

energy companies. By the end of 2001, restructuring had either been delayed or suspended in 

eight states that previously enacted legislation or issued regulatory orders for its implementation 

(shown as “Suspended” in Figure 2-2 below). Eighteen other states that had seriously explored 

the possibility of deregulation in 2000 reported no legislative or regulatory activity in 2001 (EIA, 

2003) (“Not Active” in Figure 2-2 below). Currently, there are 15 states where price deregulation 

of generation (restructuring) has occurred (“Active” in Figure 2-2 below). Power sector 

restructuring is more or less at a standstill; there have been no recent proposals to the Federal 

Energy Regulatory Commission (FERC) for actions aimed at wider restructuring, and no 

additional states have recently begun retail deregulation activity. 

Comment [A9]: It is quaint that this section has 

held over for so long given that it has been years 

since there has been any meaningful action on 

deregulation. 

Agreed. No change made 
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Figure 2-2. Status of State Electricity Industry Restructuring Activities 

Source: EIA “Status of Electricity Restructuring by State” 2010a. 

2.4 Emissions of Greenhouse Gases from Electric Utilities 

The burning of fossil fuels, which generates about 70 percent of our electricity nationwide, 

results in emissions of greenhouse gases. The power sector is a major contributor of CO2 in 

particular, but also contributes to emissions of sulfur hexafluoride (SF6), CH4, and N2O. In 2012, 

the power sector accounted for 32 percent of total nationwide greenhouse gas emissions, 

measured in CO2 equivalent12, a slight increase from its 30 percent share in 1990. Table 2-5 and 

Figure 2-3 show the contributions of the power sector relative to other major economic sectors. 

Table 2-6 and Figure 2-4 show the contributions of CO2 and other GHGs from the power sector. 

Table 2-5. Domestic Emissions of Greenhouse Gases, by Economic Sector (million metric 

tons of CO2 equivalent) 

Sector/Source 1990 2005 2008 2009 2010 2011 2012 

Electricity Generation 1,866 2,446 2,402 2,187 2,303 2,201 2,064 

Transportation 1,553 2,017 1,935 1,862 1,876 1,852 1,837 

Industry 1,531 1,408 1,372 1,221 1,301 1,298 1,278 

Agriculture 518 584 615 605 601 613 614 

Commercial 385 370 379 382 377 378 353 

Residential 345 371 365 358 3607 354 321 

 

12 All CO2 equivalent tons in this report are based on the 100-year time horizon Global Warming Potential.

Comment [A10]: 100 year? 

Footnote added 

Comment [A11]: Are these 100 yr CO2eq? Can 

that be clarified? 

Addressed by footnote, above 

Formatted: Subscript
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9 

U.S. Territories 34 58 50 48 58 58 58 

Total Emissions 6,233 7,254 7,118 6,663 6,875 6,753 6,523 

Note that 2005 CO2 emissions from the electricity generation sector differ slightly from the 2005 CO2 emissions 

presented in Chapter 3 due to differences in methodology (e.g., distribution of cogeneration emissions in the 

commercial and industrial sectors. We believe that the methodology used in Chapter 3 better corresponds to the 

units covered by the proposal. 

Source: EPA Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990–2012. April 2014.

Figure 2-6. Domestic Emissions of Greenhouse Gases, 2012 (million metric tons of CO2 

equivalent) 

Source: EPA Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990–2012. April 2014. 

 Table 2-6. Greenhouse Gas Emissions from the Electricity Sector (Generation, 

Transmission and Distribution), 2012 (million metric tons of CO2 equivalent) 

Source Total Emissions 

CO2 from Electricity Generation 2,023 

Coal 1,511 

Natural Gas 492 

Fuel Oil 19 

Geothermal 0.4 

CH4 from Electricity Generation 0.5 

Coal 0.1 

Fuel Oil 0.1 

Natural Gas 0.4 

Wood + 

N2O from Electricity Generation 18.3 

Other

4,459

68%

Electricity

Generation

2,064

32%

Formatted: Font: Bold

Deleted: 3

Deleted: ne
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

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10 

Coal 9.1 

Fuel Oil 0.3 

Natural Gas 8.7 

Wood 0.1 

SF6 from Electricity Transmission and Distribution 6.0 

Total 2,048

Source: EPA Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990–2012. April 2014. 

+ Does not exceed 0.05 Tg CO2 Eq. or 0.05 percent. 

The amount of CO2 emitted during the combustion of fossil fuels varies according to the 

carbon content and heating value of the fuel used (EIA, 2000) (see Table 2-7). Coal has higher 

carbon content than oil or natural gas and, thus, releases more CO2 during combustion. Coal 

emits around 1.7 times as much carbon per unit of energy when burned as does natural gas (EPA 

2013). 

Figure 2-3. Direct GHG Emissions from the Power Sector Relative to Total Domestic GHG 

Emissions (2012) 

Source: EPA Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990–2012. April 2014. 

38%

72%

0% 4% 0.1%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

CO2 SF6 N2O CH4

Other

Power Sector

Formatted: Space Before: 6 pt, After: 0 pt
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11 

 

 Table 2-7. Fossil Fuel Emission Factors in EPA Modeling Applications 

Fuel Type Carbon Dioxide (lbs/MMBtu) 

Coal 

Bituminous 205.2 – 206.6 

Subbituminous 212.7 – 213.1 

Lignite 213.5 – 217.0 

Natural Gas 117.1 

Fuel Oil 

Distillate 161.4 

Residual 161.4 – 173.9 

Biomass* 195 

Waste Fuels 

Waste Coal 205.7 

Petroleum Coke 225.1 

Fossil Waste 321.1 

Non-Fossil Waste 0 

Tires 189.5 

Municipal Solid Waste 91.9 

Source: Documentation for IPM Base Case v.513. See also Table 9.9 of IPM Documentation. 

Note: CO2 emissions presented here for biomass reflect combustion only. They do not include any other biogenic or 

fossil emissions/sequestration related to biomass growth, harvest, transportation or any other biomass or 

processing emissions as part of the carbon cycle. 

2.5 Improving GHG Performance at Existing EGUs 

In proposing state goals, the analysis anticipates that states will pursue a mix of carbonreducing strategies appropriate to each state’s unique situation, developing an effective state plan 

that reflects the composition of the state’s economy, existing state programs and measures, and 

characteristics of the state’s existing electricity power system (e.g., utility regulatory structure, 

generation mix, transmission system and electricity demand). The analysis assumes states will 

develop plans involving four categories (“building blocks”) of demonstrated approaches to 

improve the GHG performance of existing EGUs in the power sector:

1. Reducing the carbon intensity of generation at individual affected EGUs through heatrate improvements. 

Deleted: 

Comment [A12]: Interagency commented “We 

continue to have reservations about the IPM 

modeling. Many states currently consider biomass 

as a renewable fuel with low or zero carbon 

emissions. It is likely that IPM will bias new 

generation away from biomass in all of EPA’s 

analysis based on this emission factor. We suggest 

that IPM be re-run with an emission factor similar to 

non-fossil waste to provide the public with accurate 

information by which to make comments and to 

states so that they have an opportunity to consider 

how their state plans may be best formulated to 

include investments in renewable energy projects 

that include biomass. We reserve the opportunity to 

comment further once the IPM output is made 

available for interagency review.” 

EPA: 

We appreciate the commenters perspective on the 

issue of biomass emission factors. We discuss many 

aspects of biomass emissions in the Chapter 6 

section “Biomass Co-firing”, including issues 

relating assumptions about biomass emission factors 

and the impact of alternative assumptions on IPM 

analyses. We feel that the broader and more 

thorough biomass discussion better serves the reader 

in Chapter 6 than related to this table in this chapter, 

which is more narrowly focused on presenting the 

CO2 emission rates that were used in the IPM 

analysis. 

Comment [A13]: Interagency commented “We 

suggest EPA say instead: CO2 emissions presented

here for biomass account for combustion only and

do not reflect lifecycle emissions from a baseline of

letting the biomass decompose and emit methane

and nitrous oxide, from the initial photosynthesis

(carbon sink), or from harvesting activities and

transportation (carbon source).

Note that IPM does not account for emissions that

occur in the harvesting or transporting of fossil fuels

either.”

EPA response:  

The proposed revision is not accurate. The revision

to the last sentence is based on feedback received

from EPA’s Climate Economics Branch.

Deleted: 

Comment [A14]: I suspect that this needs to be 

reworked to conform to the preamble. I’ve flagged a 

few places where it seems like might be inconsistent 

with current thinking. 

Also, these reads as solely applicable to 111(d) even 

though this RIA also covers the 111(b) mods and 

reconstruction. 
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12 

2. Reducing emissions from the most carbon-intensive affected EGUs in the amount that 

results from substituting generation at those EGUs with generation from less carbonintensive affected EGUs (including natural gas combined cycle [NGCC] units that are 

under construction). 

3. Reducing emissions from affected EGUs in the amount that results from substituting 

generation at those EGUs with expanded low- or zero-carbon generation. 

4. Reducing emissions from affected EGUs in the amount that results from the use of 

demand-side energy efficiency that reduces the amount of generation required. 

This section briefly describes each of these four building block categories. Our analyses of 

the magnitude of the opportunity for improvements from each category, and more detail about 

how we used each state’s unique situation and availability of demonstrated approaches to 

improve GHG performance to determine state-specific emission goals, can be found in Chapter 5 

of the Greenhouse Gas Abatement Measures TSD. 

The first building block encompasses various improvements at existing EGUs that can 

lower the amount of CO2 they emit when generating power. Heat rate improvements result in any 

changes in equipment, operating procedures or maintenance practices that increase the efficiency 

of converting fuel energy into electricity by an EGU. Such efficiency changes result in more 

electricity being generated by each unit of fuel (e.g., ton of coal or cubic foot of gas), thereby 

lowering the amount of CO2 per kWh of electricity produced as a byproduct of fuel combustion. 

The second building block consists of improvements to lower the electric system’s overall 

carbon intensity by shifting generation among existing EGUs. The nation’s EGUs are connected 

by transmission grids extending over large regions. Through these interconnections, EGU 

owners and/or grid operators prioritize among EGUs when deciding which ones to operate (i.e., 

“dispatch”) to meet electricity demand at any time, subject to various constraints. Opportunities 

exist to lower significantly the electric system’s carbon intensity through redispatch among 

existing EGUs, particularly by shifting generation from coal units to natural gas combined cycle 

Comment [A15]: Exact text from version of ES 

that was sent to OMB on 5/23. 

CAMD: Accepted 

Deleted: 1. Lowering the carbon intensity of 

generation at individual affected EGUs through 

heat rate improvements¶

2. Reducing utilization of the most carbonintensive EGUs by shifting generation to less 

carbon-intensive existing fossil fuel-fired EGUs 

through redispatch ¶

3. Reducing utilization of the most carbonintensive EGUs by expanding the amount of 

new, lower carbon-intensity generation capacity¶

4. Reducing utilization of the most carbonintensive EGUs by increasing demand-side 

efficiency. ¶

Deleted: are presented in Chapter 3

Comment [A16]: Chapter 3 doesn’t provide 

detail on the BSER setting the way the TSD does. 

TSD focuses on “opportunity for improvements’ 

accepted 
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Draft Deliberative 

13 

(NGCC) units.13 Over the last several years, advances in the production of natural gas have 

helped reduce natural gas prices and improved the competitive position of gas-fired units relative 

to coal-fired units. Operators have already shifted significant quantities of generation from coal 

units to NGCCs, absent any federal CO2 requirements. Additional redispatch opportunities exist 

to further reduce carbon intensity of the power system, with extent of the additional opportunities 

varying region, based on factors such as the mix of EGU types, the relative prices of coal and 

natural gas and the amount of available NGCC capacity. 

The third building block consists of the potential to increase the amount of lower carbon 

intensity generation by expanding low-carbon and renewable generating capacity. Adding new 

nuclear or renewable generating capacity to the electric system would tend to shift generation to 

the new units from existing EGUs with higher carbon intensity. Such expansion is consistent 

with current trends. While not included in the goal setting for building block 3, the addition of 

new NGCC capacity would have a similar impact and is one option states may choose to achieve 

the goal. 

The fourth building block consists of improving the GHG performance of the power sector 

by reducing the total amount of generation required – in other words, improving demand-side 

efficiency. Many studies have found that significant improvements in demand-side efficiency 

can be realized at less cost than the savings from avoided power generation.14 These electricity 

demand reductions can be achieved through policies or programs, such as subsidies for the 

purchase of energy-efficient appliances, which incentivize investment in cost-effective efficiency 

improvements by overcoming market imperfections that otherwise thwart these investments. 

States already employ a variety of mechanisms for this purpose. These include energy efficiency 

resource standards, building energy codes and appliance and equipment energy standards. 

Reducing electricity demand also enhances efficiency by reducing the absolute amount of 

transmission and distribution losses that occur across the grid between the electricity generation 

sites and the demand sites. Particularly when integrated into a comprehensive approach for 

 

13We view opportunities to shift generation to existing renewable EGUs such as wind or solar units as limited 

because such units already tend to run when capable of doing so due to their low variable operating costs. 

14 See, e.g., Granade, et al., July 2009 and EPRI, 2009. 

Comment [A17]: “Additional” relative to what? 

Like, beyond that which is assumed in the building 

blocks? 

No; relative to what has already been accomplished 

“in the past several years” 

Comment [A18]: This doesn’t really jive with 

nuclear being “at risk”. 

CAMD: but the recent shift towards higher nuclear 

capacity factors is consistent. 

Comment [A19]: Put in reference list. 

Done; footnote modified accordingly 

Deleted: “Unlocking Energy Efficiency in the 

U.S. Economy,” Hannah Choi 

Deleted: . 

Deleted: (http://www.mckinsey.com/client_servic

e/electric_power_and_natural_gas/latest_thinking/u

nlocking_energy_efficiency_in_the_us_economy) 

and Assessment of Achievable Potential from 

Energy Efficiency and Demand Response Programs 

in the U.S. (2010 – 2030): Executive Summary. 

EPRI, Palo Alto, CA: 2009. 1018363.
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Draft Deliberative 

14 

addressing GHG emissions, demand-side efficiency improvements can improve the carbon 

profile of the electricity supply system. 

2.6 GHG and Clean Energy Regulation in the Power Sector 

2.6.1 State Policies 

Several states recently established emission performance standards or other measures to 

limit emissions of GHGs from existing EGUs that are comparable to this proposal for existing 

source guidance. 

In 2003, then-Governor George Pataki of New York sent a letter to his counterparts in the 

Northeast and Mid-Atlantic inviting them to participate in the development of a regional capand-trade program addressing power plant CO2 emissions. This program, known as the Regional 

Greenhouse Gas Initiative (RGGI), began in 2009 and sets a regional CO2 cap for participating 

states. The currently participating states include: Connecticut, Delaware, Maine, Maryland, 

Massachusetts, New Hampshire, New York, Rhode Island, and Vermont. The cap covers CO2

emissions from all fossil-fired EGUs greater than 25 MW in participating states, and limits total 

emissions to 91 million short tons in 2014. This emissions budget is reduced 2.5% annually 

from 2015 to 2020. 

In September 2006, then-Governor of California Arnold Schwarzenegger signed into law 

Senate Bill 1368. The law limits long-term investments in baseload generation by the state's 

utilities to power plants that meet an emissions performance standard jointly established by the 

California Energy Commission and the California Public Utilities Commission. The Energy 

Commission has designed regulations that establish a standard for new and existing baseload 

generation owned by, or under long-term contract to publicly owned utilities, of 1,100 lb 

CO2/MWh. 

In 2006 Governor Schwarzenegger also signed into law Assembly Bill 32, the Global 

Warming Solutions Act of 2006. This act includes a multi-sector GHG cap-and-trade program 

which covers approximately 85% of the state GHG emissions. EGUs are includes in phase I of 

the program, which began in 2013. Phase II begins in 2015 and includes upstream sources. The 

cap is based on a 2 percent reduction from total 2012 expected emissions, and declines 2 percent 

annually through 2014, then 3 percent each year until 2020. 

Comment [A20]: Where it the discussion of the 

State EE policies? 

CAMD: this is covered (briefly) in the last paragraph 

of this section, which refers to more information on 

EE. in the TSD appendix. 

Deleted: new 

Comment [A21]: !!!! 

Deleted: in this th

Deleted: e

Comment [A22]: Or it is both rulemakings 

whose benefits and costs are described in this RIA? 

Mods and existing source? Clarified as referring to 

existing source only 

Deleted: rulemaking

Comment [A23]: Might want to be consistent 

with use. Schwarzenegger isn’t governor of CA 

anymore. 

Done, and similar changes made regarding other 

former governors 

Deleted: California 

Comment [A24]: Not directly relevant to the 

rulemakings analyzed in this RIA, but I’m not sure 

that matters. Left in 
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15 

In May 2007, then-Governor Christine Gregoire of Washington signed Substitute Senate 

Bill 6001, which established statewide GHG emissions reduction goals, and imposed an emission 

standard that applies to any baseload electric generation that commenced operation after June 1, 

2008 and is located in Washington, whether or not that generation serves load located within the 

state. Baseload generation facilities must initially comply with an emission limit of 1,100 lb 

CO2/MWh. The Bill also prohibited Washington electric utilities from entering new long-term 

power contracts after June 30, 2008 with any power plant exceeding the 1,100 lb CO2/MWh 

limit.

In July 2009, then-Governor Theodore Kulongoski of Oregon signed Senate Bill 101, 

which mandated that facilities generating baseload electricity, whether gas- or coal-fired, must 

have emissions equal to or less than 1,100 lb CO2/MWh, and prohibited utilities from entering 

into long-term purchase agreements for baseload electricity with out-of-state facilities that do not 

meet that standard. Natural gas- and petroleum distillate-fired facilities that are primarily used to 

serve peak demand or to integrate energy from renewable resources are specifically exempted 

from the performance standard. 

In August 2011, then-Governor Mario Cuomo of New York signed the Power NY Act of 

2011. This regulation establishes CO2 emission standards for new and modified electric 

generators greater than 25 MW. The standards vary based on the type of facility: baseload 

facilities must meet a CO2 standard of 925 lb/MWh or 120 lb/MMBtu, and peaking facilities 

must meet a CO2 standard of 1,450 lbs/MWh or 160 lbs/MMBtu. 

Additionally, the majority of states have implemented Renewable Portfolio Standards 

(RPS), or Renewable Electricity Standards (RES). These programs are designed to increase the 

renewable share of a state’s total electricity generation. Currently 29 states and the District of 

Columbia have enforceable RPS or other mandatory renewable capacity policies, and 9 states 

have voluntary goals.15 These programs vary widely in structure, enforcement, and scope. For 

more information about existing state policies and programs that reduce power sector CO2

emissions, see the State Plan Considerations Technical Support Document Appendix. 

 

15 Database of State Incentives for Renewables and Efficiency, March 2013 and Alaska House Bill 306, 2010. 

Deleted: Washington 

Comment [A25]: Is this new source only? How 

is this relevant to the two proposals described in this 

RIA? Added additional text clarifying relevance to 

existing sources. 

Formatted: Subscript

Deleted: Oregon 

Comment [A26]: Is this a new source or existing 

source or both? I’m guessing that OR doesn’t have 

many existing effected by this rule even if it was on 

existing. CAMD: it applies to both 

Deleted: New York 

Comment [A27]: Maybe note that this is relevant 

to mods proposal described in Chapter rule 9? 

CAMD: using “modified” term makes that link 

Deleted: 

Deleted: 30

Deleted: 7

Comment [A28]: Put in reference list. done 

Comment [A29]: Including EE? Yes, EE is 

included in the TSD 

Deleted: EIA Today in Energy: Most states 

have Renewable Portfolio Standards. 2012c.
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16 

2.6.2 Federal Policies 

In April 2007, the Supreme Court concluded that GHGs met the CAA definition of an air 

pollutant, giving the EPA the authority to regulate GHGs under the CAA contingent upon an 

agency determination that GHG emissions from new motor vehicles cause or contribute to air 

pollution that may reasonably be anticipated to endanger public health or welfare. This decision 

set in motion EPA’s finding that GHG endangered public health, welfare and its regulation of 

GHG emissions for motor vehicles and set the stage for the determination of whether other 

sources of GHG emissions, including stationary sources, would need to be regulated as well. 

In response to the FY2008 Consolidated Appropriations Act (H.R. 2764; Public Law 110–

161), the EPA issued the Mandatory Reporting of Greenhouse Gases Rule (74 FR 5620) which 

required reporting of GHG data and other relevant information from fossil fuel suppliers and 

industrial gas suppliers, direct greenhouse gas emitters, and manufacturers of heavy-duty and 

off-road vehicles and engines. The purpose of the rule was to collect accurate and timely GHG 

data to inform future policy decisions. As such, it did not require that sources control greenhouse 

gases, but sources above certain threshold levels must monitor and report emissions. 

In August 2007, the EPA issued a prevention of significant deterioration (PSD) permit to 

Deseret Power Electric Cooperative, authorizing it to construct a new waste-coal-fired EGU near 

its existing Bonanza Power Plant, in Bonanza, Utah. The permit did not include emissions 

control requirements for CO2. The EPA acknowledged the Supreme Court decision, but found 

that decision alone did not require PSD permits to include limits on CO2 emissions. Sierra Club 

challenged the Deseret permit. In November 2008, the Environmental Appeals Board (EAB) 

remanded the permit to the EPA to reconsider “whether or not to impose a CO2 BACT (best 

available control technology) limit in light of the ‘subject to regulation’ definition under the 

CAA.” The remand was based in part on EAB’s finding that there was not an established EPA 

interpretation of the regulatory phrase “subject to regulation.” 

In December 2008, the Administrator issued a memo indicating that the PSD Permitting 

Program would apply to pollutants that are subject to either a provision in the CAA or a 

regulation adopted by the EPA under the CAA that requires actual control of emissions of that 

pollutant. The memo further explained that pollutants for which the EPA regulations only require 

monitoring or reporting, such as the provisions for CO2 in the Acid Rain Program, are not subject 

Deleted: to 

Deleted: e

Comment [A30]: EPA made this decision, not 

the court. The way these sentences read it is was if 

the SC decision directly led to regulation of motor 

vehicles. It didn’t per the preceding sentence. I made 

edit trying to capture what I think is trying to be said. 

accepted 
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Draft Deliberative 

17 

to PSD permitting. Fifteen organizations petitioned the EPA for reconsideration, prompting the 

agency to issue a revised finding in March 2009. After reviewing comments, the EPA affirmed 

the position that PSD permitting is not triggered for a pollutant such as GHGs until a final 

nationwide rule requires actual control of emissions of the pollutant. For GHGs, this meant 

January 2011 when the first national rule limiting GHG emissions for cars and light trucks was 

scheduled to take effect. Therefore, a permit issued after January 2, 2011, would have to address 

GHG emissions. 

The Administrator signed two distinct findings in December 2009 regarding greenhouse 

gases under section 202(a) of the Clean Air Act. The endangerment finding indicated that current 

and projected concentrations of the six key well-mixed greenhouse gases — CO2, CH4, N2O, 

hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), and SF6 — in the atmosphere threaten the 

public health and welfare of current and future generations. These greenhouse gases have long 

lifetimes and, as a result, become homogeneously distributed through the lower level of the 

Earth’s atmosphere (IPCC, 2001). This differentiates them from other greenhouse gases that are 

not homogeneously distributed in the atmosphere. The cause and contribute finding indicated 

that the combined emissions of these well-mixed greenhouse gases from new motor vehicles and 

new motor vehicle engines contribute to the greenhouse gas pollution which threatens public 

health and welfare. Both findings were published in the Federal Register on December 15, 2009 

(Docket ID EPA-HQ-OAR-2009-0171). These findings did not themselves impose any 

requirements on any industry or other entities, but allowed the EPA to regulate greenhouse gases 

under the CAA (see preamble section II.D for regulatory background). This action was a 

prerequisite to implementing the EPA's proposed greenhouse gas emission standards for lightduty vehicles, which was finalized in January 2010. Once a pollutant is regulated under the 

CAA, it is subject to permitting requirements under the PSD and Title V programs. The 2009 

Endangerment Finding and a denial of reconsideration were challenged in a lawsuit; on June 26, 

2012, the DC Circuit Court upheld the Endangerment Finding and the Reconsideration Denial, 

ruling that the Finding was neither arbitrary nor capricious, was consistent with Massachusetts v. 

EPA, and was adequately supported by the administrative record. The Court found that the EPA 

had based its decision on “substantial scientific evidence,” noted that the EPA’s reliance on 

assessments was consistent with the methods decision-makers often use to make a science-based 

Deleted: E

Comment [A31]: Which preamble does this refer 

to? Might want to make sure this isn’t referring to 

111(b). good catch...we changed it to preamble 

section II.D 
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judgment, and stated that “EPA’s interpretation of the governing CAA provisions is 

unambiguously correct.” 

In May 2010, the EPA issued the final Tailoring Rule which set thresholds for GHG 

emissions that define when permits under the New Source Review and Title V Operating Permit 

programs are required for new and existing industrial facilities. Facilities responsible for nearly 

70 percent of the national GHG emissions from stationary sources, including EGUs, were subject 

to permitting requirements under the rule. This rule was upheld by the D.C. Circuit in 2012. 

On January 8, 2014 EPA proposed a new source performance standard (NSPS) for 

emissions of carbon dioxide for new fossil fuel-fired electric utility generating units. This action 

proposes to establish separate standards for fossil fuel-fired electric steam generating units 

(utility boilers and Integrated Gasification Combined Cycle (IGCC) units) and for natural gasfired stationary combustion turbines. These proposed standards reflect separate determinations of 

the best system of emission reduction (BSER) adequately demonstrated for utility boilers and 

IGCC units and for natural gas-fired stationary combustion turbines. This action proposes a 

standard of performance for utility boilers and IGCC units based on partial implementation of 

carbon capture and storage (CCS) as the BSER. The proposed emission limit for those sources is 

1,100 lb CO2/MWh. This action also proposes standards of performance for natural gas-fired 

stationary combustion turbines based on modern, efficient natural gas combined cycle (NGCC) 

technology as the BSER. The proposed emission limits for those sources are 1,000 lb CO2/MWh 

for larger units and 1,100 lb CO2/MWh for smaller units. 

2.7 Revenues, Expenses, and Prices 

Due to lower retail electricity sales, total utility operating revenues declined in 2012 to 

$271 billion from a peak of almost $300 billion in 2008. Despite revenues not returning to 2008, 

operating expenses were appreciably lower and as a result, net income in 2012 rose in 

comparison previous years (see Table 2-8). Recent economic events and continued energy 

efficiency improvements have put downward pressure on electricity demand, thus dampening 

electricity prices and consumption (utility revenues), but have also reduced the price and cost of 

fossil fuels and other expenses. Electricity sales and revenues associated with the generation, 

transmission, and distribution of electricity are expected to rebound and increase modestly by 

2015, when revenues are projected to be roughly $359 billion (see Table 2-9). 
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Table 2-8 shows that investor-owned utilities (IOUs) earned income of about 13 percent 

compared to total revenues in 2012. Based on EIA's Annual Energy Outlook 2013, Table 2-9 

shows that the power sector is projected to derive revenues of $359 billion in 2015. Assuming 

the same income ratio from IOUs (with no income kept by public power), and using the same 

proportion of power sales from public power as observed in 2012, the EPA projects that the 

power sector will expend over $372 billion in 2015 to generate, transmit, and distribute 

electricity to end-use consumers. 

Over the past 50 years, real national average retail electricity prices have ranged from 

around 8cents per kWh in the early 1970s, to around 12 cents, reached in the early 1980s. 

Generally, retail electricity prices do not change rapidly and do not display the variability of 

other energy or commodity prices, although the frequency at which these prices change varies 

across different types of customers. Retail rate regulation has largely insulated consumers from 

the rising and falling wholesale electricity price signals whose variation in the marketplace on an 

hourly, daily, and seasonal basis is critical for driving lowest-cost matching of supply and 

demand. In fact, the real price of electricity today is lower than it was in the early 1960s and 

1980s (see Figure 2-5). 

Figure 2-5. National Average Retail Electricity Price (1960 – 2011) 

Source: EIA Annual Energy Outlook 2013 

0

2

4

6

8

10

12

14

1960 1970 1980 1990 2000 2010

cents/KWh (2011$)

Deleted: 7 

Deleted: 11
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Table 2-8. Revenue and Expense Statistics for Major U.S. Investor-Owned Electric 

Utilities ($millions)

2010 2011 2012 

Utility Operating Revenues 285,512 280,520 270,912 

Electric Utility 260,119 255,573 249,166 

Other Utility 25,393 24,946 21,745 

Utility Operating Expenses 253,022 247,118 235,694

Electric Utility 234,173 228,873 220,722 

Operation 166,922 161,460 152,379 

Production 128,831 122,520 111,714 

Cost of Fuel 44,138 42,779 38,998 

Purchased Power 67,284 61,447 54,570 

Other 17,409 18,294 18,146 

Transmission 6,948 6,876 7,183 

Distribution 4,007 4,044 4,181 

Customer Accounts 5,091 5,180 5,086 

Customer Service 4,741 5,311 5,640 

Sales 185 185 221 

Admin. and 

General 17,120 17,343 18,353 

Maintenance 14,957 15,772 15,489 

Depreciation 20,951 22,555 23,677 

Taxes and Other 31,343 29,086 29,177 

Other Utility 18,849 18,245 14,972 

Net Utility Operating Income 32,490 33,402 35,218

Source: Table 8.3, EIA Electric Power Annual, 2013a. Values are in millions of current year (i.e., nominal) terms.

Note: This data does not include information for public utilities. 

Deleted: for 2011 

Comment [A32]: Are these all in the same $ 

years? Or are the $ years vary across the reported 

years? I suspect the latter is true. Clarify? The EIA 

report cites the ultimate source of these is FERC 

Form 1 data, which is unambiguously in current year 

(e.g., nominal) dollars. There is no evidence that the 

data in this table or in the EIA report has been 

adjusted for real dollars. Table note added.. 
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Table 2-9. Projected Revenues by Service Category in 2015 for Public Power and InvestorOwned Utilities (billions) 

Generation $207 

Transmission $40 

Distribution $111 

Total $359 

Source: EIA 2013b 

Note: Data are derived by taking either total electricity use (for generation) or sales (transmission and distribution) 

and multiplying by forecasted prices by service category from Table 8 of EIA AEO 2013 (Electricity Supply, 

Disposition, Prices, and Emissions). 

On a state-by-state basis, retail electricity prices vary considerably. The Northeast and 

California have average retail prices that can be as much as double those of other states (see 

Figure 2-6). 

 
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Figure 2-6. Average Retail Electricity Price by State (cents/kWh), 2011 

Source: EIA Annual Energy Outlook, 2012a. Prices are current year (i.e., nominal) 2011 prices. 

2.8 Natural Gas Market 

The natural gas market in the United States has historically experienced significant price 

volatility from year to year, between seasons within a year, and can undergo major price swings 

during short-lived weather events (such as cold snaps leading to short-run spikes in heating 

Note: Data are displayed as 5 groups of 10 States and the District of Columbia.

            U.S. total average price per kilowatthour is 9.90 cents.

Source: U.S. Energy Information Administration, Annual Energy Review –

                Electricity Section, Table 4, September 27, 2012.

Comment [A33]: 2011 $ years? Yes. Note added 

to table 
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24 

demand). Over the last decade, gas prices (both Henry Hub prices and delivered prices to the 

power sector) have ranged from below $3 to nearly $10/mmBtu on an annual average basis (see 

Figure 2-7). During that time, the daily price of natural gas reached as high as $15/mmBtu. 

Recent forecasts of natural gas availability have also experienced considerable revision as new 

sources of gas have been discovered and have come to market, although there continues to be 

some uncertainty surrounding the precise quantity of the resource base. 

Current and projected natural gas prices are considerably lower than the prices observed 

over the past decade, largely due to advances in hydraulic fracturing and horizontal drilling 

techniques that have opened up new shale gas resources and substantially increased the supply of 

economically recoverable natural gas. According to an EIA “Energy in Brief” (EIA 2012b): 

“Shale gas refers to natural gas that is trapped within shale formations. Shales are finegrained sedimentary rocks that can be rich sources of petroleum and natural gas. Over the 

past decade, the combination of horizontal drilling and hydraulic fracturing has allowed 

access to large volumes of shale gas that were previously uneconomical to produce. The 

production of natural gas from shale formations has rejuvenated the natural gas industry 

in the United States.”

The U.S. Energy Information Administration's Annual Energy Outlook 2012 (Early 

Release) estimates that the United States possessed 2,214 trillion cubic feet (Tcf) of technically 

recoverable natural gas resources as of January 1, 2010. Natural gas from proven and unproven 

shale resources accounts for 542 Tcf of this resource estimate. The AEO 2012 (Early Release) 

notes that many shale formations, especially the Marcellus, are so large that only small portions 

of the entire formations have been intensively production-tested. Consequently, the estimate of 

technically recoverable resources is highly uncertain, and is regularly updated as more 

information is gained through drilling and production. At the 2010 rate of U.S. consumption 

(about 24.1 Tcf per year), 2,214 Tcf of natural gas is enough to supply over 90 years of use. 

Although the estimate of the shale gas resource base is lower than in the prior edition of the 

Outlook, shale gas production estimates increased between the 2011 and 2012 Outlooks, driven 

by lower drilling costs and continued drilling in shale plays with high concentrations of natural 

Deleted: 6

Formatted: Indent: Before: 0.5", First line: 

0"

Comment [A34]: 

Comment [A35]: Edit clarifies where the quote 

ends. accepted 

Deleted: M

Comment [A36]: Where is the factoid from? 

Source added 
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25 

gas liquids and crude oil, which have a higher value in energy equivalent terms than dry natural 

gas.16

EIA’s projections of natural gas conditions did not change substantially in AEO 2014 from 

the AEO 2013, and EIA is still forecasting abundant reserves consistent with the above findings. 

Recent historical data reported to EIA is also consistent with these trends, with 2013 being the 

highest year on record for domestic natural gas production.17 The average delivered natural gas 

price to the power sector was $4.49 per MMBtu in 2013, higher than in 2012 ($3.54/MMBtu), 

but still down from $4.89/MMBtu in 2011.18 

EIA projections of future natural gas prices assume trends that are consistent with 

historical and current market behavior, technological and demographic changes, and current laws 

and regulations.19 Depending on actual conditions, there may be significant variation from the 

price projected in the reference case and the price observed. To address this uncertainty, EIA 

issues a range of alternative cases, including cases with higher and lower economic growth, 

which address many of the uncertainties inherent in the long-term projections. 

 

16 For more information, see: http://www.eia.gov/forecasts/archive/aeo11/IF_all.cfm#prospectshale; 

http://www.eia.gov/energy_in_brief/about_shale_gas.cfm 

17 http://www.eia.gov/dnav/ng/hist/n9010us2a.htm 

18 http://www.eia.gov/dnav/ng/hist/n3045us3A.htm; Assumes that 1 TCF = 1.023 MMBtu natural gas 

(http://www.eia.gov/tools/faqs/faq.cfm?id=45&t=8) 

19 EIA 2010b. 
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26 

Figure 2-7. Natural Gas Spot Price, Annual Average (Henry Hub) 

Source: EIA 2010c, EIA 2012a, EIA 2013b, EIA 2014 

2.9 Electricity Demand and Demand Response 

Electricity performs a vital and high-value function in the economy. Historically, growth in 

electricity consumption has been closely aligned with economic growth. Overall, the U.S. 

economy has become more efficient over time, producing more output (gross domestic product – 

GDP) per unit of energy input, with per capita energy use fairly constant over the past 30 years 

(EIA, 2010d). The growth rate of electricity demanded has also been in overall decline for the 

past sixty years (see Figure 2-8), with several key drivers that are worth noting. First, there has 

been a significant structural shift in the U.S. economy towards less energy-intensive sectors, like 

services.20 Second, companies have financial incentives to reduce expenditures, including those 

for energy. Third, companies are responding to the marketplace and continually develop and 

 

20 EIA 2013b 

0

2

4

6

8

10

12

1990 1995 2000 2005 2010 2015 2020 2025 2030 2035 2040

2011 dollars per million Btu

Natural Gas Spot Price, Annual Average (Henry

Hub)

EIA Historical

EIA Projected (AEO 2012)

EIA Projected (AEO 2013)

EIA Projected (AEO 2014)
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27 

bring to market new technologies that reduce energy consumption. Fourth, other policies, such as 

energy efficiency standards at the state and Federal level, have reduced demand. These broader 

changes have altered the outlook for future electricity growth. 

Figure 2-8 . Electricity Growth Rate (3-Year Rolling Average) and Projections from the 

Annual Energy Outlook 2014 

Source: EIA 2009, EIA 2014 

Energy efficiency initiatives have become more common, and investments in energy 

efficiency are projected to continue to increase for the next 5 to 10 years, driven in part by the 

growing number of states that have adopted energy efficiency resource standards. These 

investments, and other energy efficiency policies at both the state and federal level, create 

incentives to reduce electricity consumption and peak load. According to EIA, demand-side 

management provided actual peak load reductions of 33.3 GW in 2010. For context, the current 

coal fleet is roughly 314 GW of capacity. 

Demand for electricity, especially in the short run, is not very sensitive to changes in prices 

and is considered relatively price inelastic, although some demand reduction does occur in 

response to price. With that in mind, the EPA modeling does not typically incorporate a “demand 

‐2%

0%

2%

4%

6%

8%

10%

12%

14%

1950 1960 1970 1980 1990 2000 2010 2020 2030 2040

Deleted: helped address certain market failures

Comment [A37]: While it might be true that they 

have addressed some market failures (directly or 

indirectly), the point of this section is discuss what is 

happening to demand, and these EE policies are 

lowering it. Changes accepted 

Comment [A38]: Reference? 

Also, has Joe B. checked this section recently? 

I don’t know....Leland 
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28 

response” in its electric generation modeling (see the discussion in Chapter 3) to the increases in 

electricity prices typically projected for EPA rulemakings. 

 

Deleted: Electricity demand is considered to be 

constant in EPA modeling applications and the 

reduction in production costs that would result from 

lower demand is not considered in the primary 

analytical scenario that is modeled. This leads to 

some overstatement in the private compliance costs 

that the EPA estimates for rules where compliance 

costs are anticipated for a rulemaking. 

Comment [A39]: Sort of odd that we are talking 

about modeling here and a caveat to cover in Chapter 

3 (which is actually dealt with in Chapter 3, except 

perhaps for the over statement part. 

Maybe just cut this text here because it is picked up 

in Chapter 3? Agreed. Text deleted. 
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29 

2.10 References 

Alaska House Bill 306. Signed by Governor Sean Parnell June 16, 2010. Available online at: 

http://www.legis.state.ak.us/basis/get_bill_text.asp?hsid=HBO306Z&session=26. 

Database of State Incentives for Renewables and Efficiency. March 2013. Accessed May 23, 

2014. Available online at: http://www.dsire.org. 

Granade, Hannah Choi; Creyts, Jon; Derkach, Anton; Farese, Philip; Nyquist, Scott; and 

Ostrowski, Ken. 2009 “Unlocking Energy Efficiency in the U.S. Economy”. Available online 

at 

http://www.mckinsey.com/client_service/electric_power_and_natural_gas/latest_thinking/unl

ocking_energy_efficiency_in_the_us_economy. 

EPRI. 2009. “Assessment of Achievable Potential from Energy Efficiency and Demand 

Response Programs in the U.S. (2010 – 2030): Executive Summary”. Palo Alto, CA. EPRI 

Product ID. Available online at: 

http://www.epri.com/abstracts/pages/productabstract.aspx?ProductID=000000000001016987 

Intergovernmental Panel on Climate Change. 2001. “Climate Change 2001: The Scientific 

Basis. 2001.” Available online at: 

http://www.grida.no/publications/other/ipcc_tar/?src=/climate/ipcc_tar/wg1/218.htm. 

International Energy Agency (IEA).2013. “Tracking Clean Energy Progress 2013.” Input to the 

Clean Energy Ministerial. 2013. Available online at: http://www.iea.org/etp/tracking/. 

Oil and Gas Journal. “Enhanced Oil Recovery Survey,” 2010. Volume 108, Issue 14, April 19, 

p.41. 

U.S. Energy Information Administration (U.S. EIA). 2000. “Carbon Dioxide Emissions from the 

Generation of Electric Power in the United States,” July. Available online at: 

<ftp://ftp.eia.doe.gov/environment/co2emiss00.pdf>. 

U.S. Energy Information Administration (U.S. EIA). 2003. “Electric Power Annual 2003. 2003.” 

Available online at: <http://www.eia.gov/electricity/annual/archive/03482003.pdf>. 

U.S. EIA. 2009. “Electric Power Annual 2009.” Available online at: 

<http://www.eia.gov/electricity/annual/archive/03482009.pdf>. 

U.S. EIA. 2010a. “Status of Electricity Restructuring by State.” Available online at: 

<http://www.eia.gov/cneaf/electricity/page/restructuring/restructure_elect.html>. 

U.S. EIA. 2010b. “AEO 2010 Retrospective Review.” Available online at: 

<http://www.eia.gov/forecasts/aeo/retrospective/>. 

Comment [A40]: A lot of these look to be 

holdovers from the 111(b) analysis. Deletions and 

additions made. 

Deleted: Brennan, S.T.; R. C. Burruss; M.D. 

Merrill; P. A. Freeman and L. F. Ruppert. 2010. “A 

Probabilistic Assessment Methodology for the 

Evaluation of Geologic Carbon Dioxide Storage: 

U.S. Geological Survey Open-File Report 2010–

1127. 2010.” Available online at 

http://pubs.usgs.gov/of/2010/1127.¶

Formatted: Normal, Indent: Before: 0",

Hanging: 0.2"

Formatted: Normal

Formatted: Normal, Indent: Before: 0",

Hanging: 0.2"

Formatted: Normal

Deleted: Interagency Task Force on Carbon 

Capture and Storage. 2010. “Report of the 

Interagency Task Force on Carbon Capture and 

Storage,” August 2010. Available online at: 

http://www.epa.gov/climatechange/downloads/CCS

-Task-Force-Report-2010.pdf. ¶

Deleted: National Energy Technology Laboratory 

(NETL). 2008. “Reducing CO2 Emissions by 

Improving the Efficiency of Existing Coal-fired 

Power Plant Fleet,” July 2008. Available online at: 

http://www.netl.doe.gov/energyanalyses/pubs/CFPP%20Efficiency-FINAL.pdf.¶

National Energy Technology Laboratory (NETL). 

“Improving Domestic Energy Security and 

Lowering CO2 Emissions with Next Generation 

CO2-Enhanced Oil Recovery (CO2-EOR),” June 20, 

2011. DOE/NETL-2011/1504. Available online at: 

http://www.netl.doe.gov/energyanalyses/refshelf/PubDetails.aspx?Action=View&P

ubId=391.¶

National Energy Technology Laboratory (NETL). 

2012. “The United States 2012 Carbon Utilization 

and Storage Atlas,” Fourth Edition. Available 

online at: 

http://www.netl.doe.gov/technologies/carbon_seq/r

efshelf/atlasIV/.¶

National Energy Technology Laboratory (NETL). 

2013. “Energy Analyses: Cost and Performance 

Baselines for Fossil Energy Plants.” Available 

online at: http://www.netl.doe.gov/energyanalyses/baseline_studies.html.¶

Deleted: Pacific Northwest National Laboratory 

(PNNL). 2009.“An Assessment of the Commercial 

Availability of Carbon Dioxide Capture and 

Storage Technologies as of June 2009,” June. 

Available online at: 

http://www.pnl.gov/science/pdf/PNNL18520_Status_of_CCS_062009.pdf.¶
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30 

U.S. EIA. 2010c. “Annual Energy Outlook 2010.”Available online at: 

<http://www.eia.gov/oiaf/archive/aeo10/index.html>. 

U.S. EIA. 2010d. “Annual Energy Review 2010.” Available online at: 

<http://www.eia.gov/totalenergy/data/annual/pdf/aer.pdf>. 

U.S. EIA. 2011. “Annual Energy Outlook 2011.” Available online at: 

<http://www.eia.gov/forecasts/archive/aeo11/>. 

U.S. EIA. 2012a. “Annual Energy Outlook 2012 (Early Release).” Available online at: 

<http://www.eia.gov/forecasts/aeo/>. 

U.S. EIA. 2012b. “Energy in Brief: What is Shale Gas and Why is it Important?” Available 

online at: <http://www.eia.gov/energy_in_brief/about_shale_gas.cfm>.

U.S. EIA. 2013a. “Electric Power Annual 2012.”Available online at: 

<http://www.eia.gov/electricity/annual/>. 

U.S. EIA.2013b. “Annual Energy Outlook 2013.” Available online at: 

<http://www.eia.gov/forecasts/aeo/>. 

U.S. EIA.2014. “Annual Energy Outlook 2014.” Available online at: 

<http://www.eia.gov/forecasts/aeo/>. 

U.S. Environmental Protection Agency. 2014. “Inventory of U.S. Greenhouse Gas Emissions 

and Sinks: 1990–2012,” April. Available online at: 

<http://www.epa.gov/climatechange/ghgemissions/usinventoryreport.html>. 

Deleted: U.S. EIA. 2012c. “Today in Energy: 

Most states have Renewable Portfolio Standards.” 

Available online at: 

<http://www.eia.gov/todayinenergy/detail.cfm?id=4

850>.¶

Deleted: ¶

Deleted: U.S. Geological Survey Geologic 

(USGS). 2013. “National Assessment of Geologic 

Carbon Dioxide Storage Resources – Summary: U.S. 

Geological Survey Factsheet 2013-3020.” Available 

online at: <http://pubs.usgs.gov/fs/2013/3020/>.
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3-1 

CHAPTER 3: COST, ECONOMIC, AND ENERGY IMPACTS 

3.1 Introduction 

This chapter reports the compliance cost, economic, and energy impact analysis 

performed for the proposed rule. EPA used the Integrated Planning Model (IPM), developed by 

ICF International, to conduct its analysis. IPM is a dynamic linear programming model that can 

be used to examine air pollution control policies for CO2, SO2, NOX, Hg, HCl, and other air 

pollutants throughout the United States for the entire power system. The IPM analysis is 

complemented by an analysis of the cost and scope of reductions in electricity demand that can 

be achieved through energy efficiency programs. 

3.2 Overview 

EPA is proposing emission guidelines for states to follow in developing plans to address 

greenhouse gas emissions from existing fossil fuel-fired electric generating units. Specifically, 

the EPA is proposing state-specific rate-based goals for CO2 emissions from the power sector, as 

well as guidelines for states to use in developing plans to attain the state-specific goals. This rule, 

as proposed, would set in motion actions to lower the carbon intensity of power generation in the 

United States. 

Over the last decade, EPA has conducted extensive analyses of regulatory actions 

affecting the power sector. These efforts support the Agency’s understanding of key variables 

that influence the effects of a policy and provide the framework for how the Agency estimates 

the costs and benefits associated with its actions. 

The estimated annual costs of the proposed action are between $5.4 and $7.4 billion in 

2020 and between $7.3 and $8.8 billion in 2030 for the primary Option (Option 1). The 

alternative option (Option 2) has annual estimated costs of between $4.2 and $5.4 billion in 2020 

and between $1.9 and $3.1 billion in 2030.21 

 

21 All costs represent real dollars ($2011). 

Comment [A41]: How much CO2 is abated by 

each BB? What is the MC and AC per BB? 

We think it is very important for EPA to provide this 

information. 

EPA: The illustrative compliance scenarios 

presented in the RIA are focused on achieving the 

state goals (expressed as average CO2 rates), and 

affords flexibility over technologies (building 

blocks), time (multi-year compliance timeframe), 

and geography (the ability of states to partner 

together to reduce costs, shown in the regional 

scenarios). There is no explicit representation of 

each building block in the compliance modeling, and 

all interact together simultaneously to achieve the 

state goals. Thus, there is no way to firmly itemize 

the effect of each building block. 

But now on page 517 of the preamble EPA 

indicates that BBs 1 and 2 alone can reduce CO2 

emissions by 22% relative to 2005, so it seems 

there should be a way to parcel out (albeit 

imperfectly) roughly what each BB contributes to 

CO2 reductions. 

 In order to reflect what the illustrative impacts could 

be, we have capture the appropriate system costs and 

are not able to provide marginal costs, since we are 

not able to pinpoint particular policy dimensions that 

states may adopt and which have a more meaningful 

impact on marginal prices. Some additional 

supplemental materials and cost estimates have been 

added to particular TSDs and the preamble to 

support the various building blocks. 

Can EPA please explain how it can determine a BB 

is cost effective without knowing what the marginal 

abatement cost is? We think it is extremely 

important for EPA to produce their best estimate of 

the MAC from each BB. 

EPA: Statutory language requires EPA to evaluate 

the reasonableness of BSER, and we believe the 

preamble and TSDs fully demonstrate the 

reasonableness of BSER and the resulting state 

goals. 

Comment [A42]: So there is no price response? 

EPA should do a sensitivity analysis and flag this for 

the final rule RIA. 

EPA has quantified end-use EE through 

complimentary analysis. 

Deleted: carbon dioxide

Comment [A43]: Present costs separately from 

energy savings. 

EPA: See subsequent response. Also, the EE costs 

are also broken out in the RIA, should one want to 

see those in isolation..
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3-2 

3.3 Power Sector Modelling Framework 

The Integrated Planning Model (IPM), developed by ICF Consulting, is a state-of-the-art, 

peer-reviewed, dynamic linear programming model that can be used to project power sector 

behavior under future business-as-usual conditions and examine prospective air pollution control 

policies throughout the contiguous United States for the entire electric power system. EPA used 

IPM, inclusive of the electricity demand reductions achieved through the energy efficiency 

scenario included in the proposed rule, to project likely future electricity market conditions with 

and without the proposed rule. The level of energy efficiency-driven reductions in electricity 

demand and their associated costs are reported in Section 3.6. 

IPM is a multi-regional, dynamic, deterministic linear programming model of the U.S. 

electric power sector. It provides forecasts of least cost capacity expansion, electricity dispatch, 

and emission control strategies while meeting energy demand and environmental, transmission, 

dispatch, and reliability constraints. EPA has used IPM for over two decades to better understand 

power sector behavior under future business-as-usual conditions and evaluate the economic and 

emission impacts of prospective environmental policies. The model is designed to reflect 

electricity markets as accurately as possible. EPA uses the best available information from 

utilities, industry experts, gas and coal market experts, financial institutions, and government 

statistics as the basis for the detailed power sector modeling in IPM. The model documentation 

provides additional information on the assumptions discussed here as well as all other model 

assumptions and inputs.22,

 

Although the Agency typically focuses on broad system effects when assessing the 

economic impacts of a particular policy, EPA’s application of IPM includes a detailed and 

sophisticated regional representation of key variables affecting power sector behavior. 

The model incorporates a detailed representation of the fossil-fuel supply system that is 

used to forecast equilibrium fuel prices. The model includes an endogenous representation of the 

North American natural gas supply system through a natural gas module that reflects a partial 

supply/demand equilibrium of the North American gas market accounting for varying levels of 

 

22 Detailed information and documentation of EPA’s Base Case using IPM (v5.13), including all the underlying 

assumptions, data sources, and architecture parameters can be found on EPA’s website at: 

http://www.epa.gov/powersectormodeling 

Deleted: continental

Deleted: The Integrated Planning Model (

Deleted: )

Deleted: 23

Comment [A44]: suggests that EPA include a 

remark acknowledging that sequestration and other 

emissions should be considered as part of the carbon 

cycle 

EPA: We do not understand the relevance of this 

comment to this description of the power sector 

modeling framework. 

Deleted: /BaseCasev513.html
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3-3 

potential power sector gas demand and corresponding gas production and price levels.24 This 

module consists of 118 supply, demand, and storage nodes and 15 liquefied natural gas regasification facility locations that are tied together by a series of linkages (i.e., pipelines) that 

represent the North American natural gas transmission and distribution network. 

IPM also endogenously models the partial equilibrium of coal supply and EGU coal 

demand levels throughout the continental U.S., taking into account assumed non-power sector 

demand and imports/exports. IPM reflects 36 coal supply regions, 14 coal grades, and the coal 

transport network, which consists of over four thousand linkages representing rail, barge, and 

truck and conveyer linkages. The coal supply curves in IPM, which are publicly available, were 

developed during a thorough bottom-up, mine-by-mine approach that depicts the coal choices 

and associated supply costs that power plants would face if selecting that coal over the modeling 

time horizon. The IPM documentation outlines the methods and data used to quantify the 

economically recoverable coal reserves, characterize their cost, and build the 36 coal regions 

curves. The coal supply curves were developed in consultation with Wood Mackenzie, one of the 

leading energy consulting firms and specialists in coal supply. These curves have been 

independently reviewed by industry experts and have been made available for public review 

prior to this rulemaking process.25 

EPA has used IPM extensively over the past two decades to analyze options for reducing 

power sector emissions. Previously, the model has been used to forecast the costs, emission 

changes, and power sector impacts for the Clean Air Interstate Rule, Cross-State Air Pollution 

Rule (CSAPR), the Mercury and Air Toxics Standards (MATS), and the proposed Carbon 

Pollution Standards for New Power Plants. 

The model and EPA's assumptions input into the model undergo periodic formal peer 

review. The rulemaking process also provides opportunity for expert review and comment by a 

variety of stakeholders, including owners and operators of capacity in the electricity sector that is 

represented by the model, public interest groups, and other developers of U.S. electricity sector 

models. The feedback that the Agency receives provides a highly detailed review of key input 

 

24 See Chapter 10 of EPA’s Base Case using IPM (v5.13) documentation, available at: 

http://www.epa.gov/powersectormodeling/BaseCasev513.html 

25 See Chapter 9 of EPA’s Base Case using IPM (v5.13) documentation, available at: 

http://www.epa.gov/powersectormodeling/BaseCasev513.html 
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3-4 

assumptions, model representation, and modeling results. IPM has received extensive review by 

energy and environmental modeling experts in a variety of contexts. For example, in the late 

1990’s, the Science Advisory Board reviewed IPM as part of the CAA Amendments Section 812 

prospective studies that are periodically conducted. The model has also undergone considerable 

interagency scrutiny when it has been used to conduct over a dozen legislative analyses 

(performed at Congressional request) over the past decade. The Agency has also used the model 

in a number of comparative modeling exercises sponsored by Stanford University’s Energy 

Modeling Forum over the past 15 years. 

IPM has also been employed by states (e.g., for RGGI, the Western Regional Air 

Partnership, Ozone Transport Assessment Group), other Federal and state agencies, 

environmental groups, and industry, all of whom subject the model to their own review 

procedures. 

3.3.1 Recent Updates to EPA’s Base Case using IPM (v.5.13) 

This new IPM modeling platform (v.5.13) incorporates important structural 

improvements and data updates with respect to the previous version (v.4.10_MATS), and 

includes notable changes to the modeling architecture. This is the fifth major iteration of EPA’s 

base case using IPM, and calibrates certain information and data from the Energy Information 

Agency's (EIA) Annual Energy Outlook (AEO), in this case AEO 2013 (hence the platform 

name of v5.13). 

The current base case represents a projection of electricity sector activity that takes into 

account only those Federal and state laws and regulations whose provisions were either in effect 

or enacted and clearly delineated at the time the base case was finalized in August 2013. The 

EPA Base Case v.5.13 includes the Clean Air Interstate Rule (CAIR),26 the Mercury and Air 

Toxics Rule (MATS), and other state and Federal regulations to the extent that they contain 

measures, permits, or other air-related limitations or requirements. 

 

26 EPA Base Case v.5.13 includes the Clean Air Interstate Rule (CAIR), a Federal regulatory measure for achieving the 1997 National Ambient Air Quality Standards (NAAQS) 

for ozone (8-hour average of 0.08 ppm) and fine particles (24-hour average of 65 μg/m3 or less and annual average of 15 μg/m3 for particles of diameter 2.5 micrometers or 

less, i.e., PM2.5). Originally issued on March 10, 2005, CAIR was remanded back to EPA by the U.S. Court of Appeals for the District of Columbia Circuit in December 

2008 and EPA was required to correct legal flaws in the regulations that had been cited in a ruling by the Court in July 2008. CAIR remains in effect until replaced by EPA 

pursuant to the Court’s ruling. CAIR’s provisions were still in effect when EPA Base Case v.5.13 was released. 
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EPA has also updated the National Electric Energy Data System (NEEDS). This database 

contains the unit-level data that is used to construct the "model" plants that represent existing and 

committed27 units in EPA modeling applications of IPM. NEEDS includes basic geographic, 

operating, air emissions, and other data on these generating units.28

Other routine updates were also adopted in v5.13. These include changes based on public 

comments that have been received over the last few years, updates reflecting planned new power 

plant construction, retirements, new power plant cost and performance, pollution control costs 

and performance, emission rate assignments, and state rules and enforcement actions. The update 

also included further refinement to the modeled regions to reflect more recent power market 

structure based on NERC, FERC, EIA, and other data and planning sources, and now includes 

more regions that better reflect limitations on current power system dispatch and transmission 

behavior. 

3.4 State Goals in this Proposal 

In this action, the EPA is proposing state-specific rate-based goals to guide states in the 

development of their plans. The agency is proposing one option (Option 1) for state-specific 

goals and requesting comment on a second set of state-specific goals and compliance period 

(Option 2). 

Table 3-2. Proposed State Goals (Adjusted MWh-Weighted-Average Pounds of CO2 Per 

Net MWh from all Affected Fossil Fuel-Fired EGUs) for Options 1 and 2 

State29

Option 1 Option 2 

Interim Goal 

(2020-2029) 

Final Goal 

(2030 Forward) 

Interim Goal 

(2020-2024) 

Final Goal 

(2025 Forward) 

Alabama 1,147 1,059 1,270 1,237 

Alaska 1,097 1,003 1,170 1,131 

Arizona * 735 702 779 763 

 

27 v.5.13 includes planned units that had broken ground or secured financing and were expected to be online by the 

end of 2015; one geothermal unit and four nuclear units that are scheduled to come online after 2015 were also 

included. For more information, see Chapter 4 of EPA’s Base Case using IPM (v5.13) documentation, available 

at: http://www.epa.gov/powersectormodeling/BaseCasev513.html 

28 The NEEDS database can be found on the EPA’s website for the Base Case using IPM (v5.13), 

<http://www.epa.gov/powersectormodeling/BaseCasev513.html>. 

29 The EPA has not developed goals for Vermont and the District of Columbia because current information indicates 

those jurisdictions have no affected EGUs. Also, as noted above, EPA is not proposing goals for tribes or U.S. 

territories at this time. 
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Arkansas 968 910 1,083 1,058 

California 556 537 582 571 

Colorado 1,159 1,108 1,265 1,227 

Connecticut 597 540 651 627 

Delaware 913 841 1,007 983 

Florida 794 740 907 884 

Georgia 891 834 997 964 

Hawaii 1,378 1,306 1,446 1,417 

Idaho 244 228 261 254 

Illinois 1,366 1,271 1,501 1,457 

Indiana 1,607 1,531 1,715 1,683 

Iowa 1,341 1,301 1,436 1,417 

Kansas 1,578 1,499 1,678 1,625 

Kentucky 1,844 1,763 1,951 1,918 

Louisiana 948 883 1,052 1,025 

Maine 393 378 418 410 

Maryland 1,347 1,187 1,518 1,440 

Massachusetts 655 576 715 683 

Michigan 1,227 1,161 1,349 1,319 

Minnesota 911 873 1,018 999 

Mississippi 732 692 765 743 

Missouri 1,621 1,544 1,726 1,694 

Montana 1,882 1,771 2,007 1,960 

Nebraska 1,596 1,479 1,721 1,671 

Nevada 697 647 734 713 

New Hampshire 546 486 598 557 

New Jersey 647 531 722 676 

New Mexico * 1,107 1,048 1,214 1,176 

New York 635 549 736 697 

North Carolina 1,077 992 1,199 1,156 

North Dakota 1,817 1,783 1,882 1,870 

Ohio 1,452 1,338 1,588 1,545 

Oklahoma 931 895 1,019 986 

Oregon 407 372 450 420 

Pennsylvania 1,179 1,052 1,316 1,270 

Rhode Island 822 782 855 840 

South Carolina 840 772 930 897 

South Dakota 800 741 888 861 

Tennessee 1,254 1,163 1,363 1,326 

Texas 853 791 957 924 

Utah * 1,378 1,322 1,478 1,453 

Virginia 884 810 1,016 962 

Washington 264 215 312 284 
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West Virginia 1,748 1,620 1,858 1,817 

Wisconsin 1,281 1,203 1,417 1,380 

Wyoming 1,808 1,714 1,907 1,869 

* Excludes EGUs located in Indian country. 

Note that the proposed state goals in Table 3-5 differ slightly from the state goals 

modelled in the illustrative compliance scenarios analyzed in this RIA. Any differences in the 

goals are minor and reflect small adjustments to the goal setting methodology due to minor 

adjustments in the assumed at-risk nuclear capacity, fossil units included in Indian Country, the 

treatment of cogeneration in historical data, and the assumed applicability for some units. The 

resulting changes to the state goals are minor, and any differences in results obtained by 

analyzing these new goals would be negligible. Furthermore, these small changes in the goals 

would be offset by comparable changes in the illustrative compliance scenarios (in which 

compliance is consistent with the assumptions used in setting state goals). 

3.5 Compliance Scenarios Analyzed 

In order to estimate the costs, benefits, and impacts of implementing the proposed 

guidelines, the EPA modeled two illustrative compliance scenarios. One of these scenarios 

allows averaging of emission rates within each individual state (these scenarios are referred to as 

“state”), and another set of scenarios where groups of states are assumed to collaborate and 

achieve compliance across larger regions (referred to as “regional”). Estimates of the benefits, 

costs, and economic impacts of this proposed action are presented for both state and regional 

compliance.30 These illustrative compliance scenarios are designed to reflect, to the extent 

possible, the scope and nature of the proposed guidelines. However, there is considerable 

uncertainty with regard to the precise measures that states will adopt to meet the proposed 

requirements, since there are considerable flexibilities afforded to the states in developing their 

state plans. Nonetheless, the analysis of the benefits, costs, and relevant impacts of the proposed 

rule attempts to encapsulate some of those flexibilities in order to inform states and stakeholders 

of the potential overall impacts of the proposal. The relevant impacts, costs, and benefits are 

provided for 2020, 2025, and 2030 for Options 1 and 2 (with both state and regional 

compliance). 

 

30 For more details on the nature of the regulatory options, see the preamble. 
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It is also important to note that the analysis does not specify any particular CO2 reduction 

measure to occur, with the exception of the level of demand-side energy efficiency (EE), which 

the model is not currently configured to include as an endogenous compliance option. In other 

words, aside from EE, the analysis allows the power system the flexibility to respond to average 

emissions rate constraints on affected sources in the illustrative scenarios that achieve the state 

rate-based goals in the most cost-effective manner determined by IPM, as specified below. 

In the illustrative compliance scenarios analyzed, the average emissions rate of the source 

types included in the calculation of the state goals must be, on average, less than or equal to the 

proposed goals over the entire compliance period. That is, the sources assumed to be directly 

affected by the illustrative state compliance scenarios are only those included in the calculation 

of the state goals, and include affected sources as well as savings from demand-side energy 

efficiency.

31 These affected sources are: 32 

 Existing fossil steam boilers with nameplate capacity greater than 25 MW 

 Existing NGCC units with nameplate capacity greater than 25 MW 

 Simple cycle combustion turbines with nameplate capacity greater than 25 MW, 

and 33% capacity factor and 219,000 MWh of generation in 2012 

 New and existing non-hydro renewable capacity 

 At risk and under construction nuclear.33 

All compliance scenarios modeled include an assumption that affected sources within 

states are able to meet state goals collectively, by averaging all of their emissions relative to all 

of their generation. This approach enables some sources to emit at rates higher than the relevant 

goal, as long as there is corresponding generation coming from sources that emit at a lower rate 

such that the goal (in lbs/MWh) is met across all affected sources collectively. The average 

emissions rate at covered sources must be less than or equal to the applicable state goal, on 

average, over the entire compliance period, but not in any particular year. 

 

31 As discussed in the preamble, for compliance purposes states may be able to include sources of generation in the 

calculation of the state’s emission rate other than those sources of generation considered in constructing the 

building blocks for setting the state goals. However, this illustrative analysis does not include those options. 

32 For the illustrative scenarios renewable generation includes generation from wind, solar, geothermal, and biomass 

co-fired with coal. Dedicated biomass is not an affected source in the illustrative scenarios. 

33 See Technical Support Document – GHG Abatement Measures 

Deleted: Furthermore, a

Deleted: 34
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3-9 

The illustrative compliance scenarios further assume that the states adopt intertemporal 

averaging in the initial compliance period for both Option 1 and Option 2. That is, the average 

emissions rate at covered sources in each state must be less than or equal to the applicable state 

goal over the compliance period. The initial compliance period for Option 1 is 2020 to 2029 and 

for Option 2 it is 2020 to 2024. After the initial compliance period the average emission rate of 

the affected sources in each year must be less than or equal to the state goal in the illustrative 

compliance scenarios. 

For EE, the megawatt-hour (MWh) savings and associated costs are specified 

exogenously for Option 1 and Option 2 compliance scenarios consistent with the EE "best 

practice" performance levels informing calculation of state goals under each option. EPA has 

determined that these performance levels are achievable at costs that are generally less than 

avoided power system costs. EPA has specified and imposed EE-related costs and changes in 

future electricity demand exogenously when modeling the compliance scenarios presented for 

this rule. Details of the implementation of the demand reduction are reported in the following 

section.

EPA also analyzed a set of compliance scenarios that assume greater geographic 

flexibility for compliance where states may choose to cooperate in order to achieve more costeffective outcomes, since some states can reduce their emissions more easily relative to others. 

This scenario is modeled for both Option 1 and Option 2 and is referred to as the “Regional” 

scenario. The regional scenarios allow emission rate averaging across affected sources within six 

multi-state regions, informed by North American Electric Reliability Corporation (NERC) 

regions and Regional Transmission Organizations (RTOs). These regions do not always follow 

state borders, however, so certain states that fall into more than one region were grouped in 

regions where there was a majority of geographic territory (area) or generation. While Florida 

and Texas each have unique NERC regions unto themselves, for purposes of this compliance 

analysis, those states were each grouped with other neighboring states. 

 West (WECC) (CA, WA, OR, ID, MT, UT, NV, CO, WY, NM, AZ) 

 North Central (MISO)35 – ND, SD, IA, MN, WI, MO, IL, IN, MI 

 South Central (SPP + ERCOT) – NE, KS, OK, AR, TX, LA 

 Southeast (SERC + FL) – KY, NC, SC, TN, MS, AL, GA, FL 

 

35 Note that the MISO region expanded to integrate Entergy territory at the end of 2013. 

Deleted: . 
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 East Central (PJM) – OH, PA, WV, MD, DE, NJ, VA 

 Northeast (NPCC) – NY, RI, MA, CT, NH, VT, ME 

Figure 3-4. NERC Regions 

Figure 3-5. NERC Assessment Areas 
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 Figure 3-6. Regional Compliance Zones Used in this Analysis 

These regional groupings of states allow the state goals in each option analyzed to be met 

collectively by averaging emission rate performance across all affected units located in that 

region. Results are also presented for “State” scenarios (for both options), to illustrate potential 

impacts and benefits should states choose not to cooperate in a “Regional” manner. In the 

regional scenarios, as in the state scenarios, affected sources in each state must respond to their 

respective state goal. However, the ability to average is extended to all affected sources in each 

compliance region. In these scenarios, the average emissions rate from affected sources in each 

region must be less than or equal to the weighted average37 of the state goals in that region, over 

the compliance period. Furthermore, as in the “State” scenarios, the regions are assumed to 

adopt intertemporal averaging in the initial compliance period for each Option. 

The analysis in the illustrative scenarios does not assume that states use any specific 

policy mechanism to achieve the state goals. While IPM produces a least cost solution to 

achieve the state goals imposed in the illustrative scenarios, there may be less costly approaches 

that the states may adopt to achieve their state goals. 

 

37 The weights are the generation of the covered sources plus the demand-side energy savings, in the respective 

state.

Deleted: Estimates and r

Deleted: 36

Deleted: finds 

Deleted: way 

Deleted: to achieve the rate-based constraints 

Deleted: where t
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3.6 Demand Side Energy Efficiency 

3.6.1 Projected Demand-Side Energy Savings38

To estimate the potential electricity demand reduction that could be achieved, and 

associated costs incurred, through implementation of demand-side energy efficiency policies, 

EPA developed scenarios that reflect increased levels of demand-side energy efficiency, rooted 

in what leading states have already accomplished or have requirements in place to accomplish.39

For Option 1, adjustments were made to each state’s annual incremental reduction in electricity 

consumption by ramping up from an historical basis40 to a target rate of 1.5% of electricity 

demand annually over a period of years starting in 2017, and maintain that rate throughout the 

modeling horizon. Twelve leading states have either achieved, or have established requirements 

that will lead them to achieve, this rate of incremental electricity demand reduction, which we 

refer to as the “savings rate.” The pace of improvement from the state’s historical value is 

assumed to be 0.2% per year, beginning in 2017 until the target rate of reduction from baseline 

electricity demand is achieved. States already at or above the 1.5% annual incremental savings 

rate are assumed to have a 1.5% rate beginning in 2017 and sustain that rate. For Option 2, the 

annual incremental savings rate is ramped up from an historical basis to a target rate of 1.0% and 

at a pace of improvement of 0.15% per year, beginning in 2017, until the target rate is achieved. 

States already at or above the 1.0% annual incremental savings rate are assumed to sustain a 

1.0% rate beginning in 2017. Twenty leading states have either achieved, or have established 

requirements that will lead them to achieve, this rate of savings. The incremental savings rate for 

each state, for each year, is then used to derive cumulative annual energy savings based upon 

information/assumptions about the average life of EE measures and the distribution of measure 

lives within a state’s full portfolio of EE programs. The cumulative annual energy savings 

 

38 For a more detailed discussion of the demand-side energy efficiency savings projections, refer to the Greenhouse 

Gas Abatement Measures TSD.

39 This scenario is intended to represent a feasible pathway for additional EE resulting from accelerated use of 

energy efficiency policies, in all states, consistent with a level of performance that has already been 

demonstrated or required by policies (e.g., energy efficiency resource standards) of leading energy efficiency 

implementing states, and consistent with a demonstrated annual pace of performance improvement from current 

levels. It does not represent an estimate of the full potential for end-use EE. 

40 The historical basis of the percentage of reduced electricity consumption differs for each state and is drawn from 

the data reported in Energy Information Administration (EIA) Form 861, 2012, available at 

http://www.eia.gov/electricity/data/eia861/. 

Deleted: ¶
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3-13 

derived for Option 1 and Option 2 using this methodology are used consistently to set goals and 

to conduct power sector compliance modeling for each option.41

To reflect the implementation of demand-side energy efficiency in modeling, the fixed 

total electricity demand in IPM was adjusted exogenously to reflect the estimated future-year 

energy savings calculated from the approach described above. State energy savings in sales were 

scaled up to account for transmission losses and applied to base case generation demand in each 

model year to derive adjusted demand for each state, reflecting the energy efficiency scenario 

energy savings.42 The demand adjustments were applied proportionally across all segments (peak 

and non-peak) of the load duration curve.43 In order to reflect the adjusted state-level demand 

within IPM model regions that cross state borders, energy savings from a bisected state were 

distributed between the applicable IPM model regions using a distribution approach based on 

reported sales in 2013 as a proxy for the distribution of energy efficiency investment 

opportunities. 

 Table 3-3. Net Cumulative Savings as a Percent of Projected BAU Sales

 Option 1 Option 2 

 2020 2025 2030 2020 2025 2030 

Alabama 1.36% 6.19% 10.09% 1.07% 4.54% 7.09% 

Arizona 5.24% 9.50% 11.72% 3.52% 6.45% 8.04% 

Arkansas 1.52% 6.46% 10.31% 1.24% 4.77% 7.27% 

California 4.95% 9.46% 11.90% 3.55% 6.57% 8.23% 

Colorado 3.92% 8.73% 11.39% 3.32% 6.35% 8.02% 

Connecticut 4.71% 9.55% 12.27% 3.61% 6.77% 8.56% 

Delaware 1.14% 5.94% 10.14% 0.86% 4.32% 7.10% 

District of Columbia 1.14% 5.94% 10.14% 0.86% 4.32% 7.10% 

Florida 2.03% 7.04% 10.50% 1.75% 5.26% 7.45% 

Georgia 1.76% 6.74% 10.40% 1.48% 5.01% 7.36% 

Idaho 3.80% 8.73% 11.50% 3.28% 6.38% 8.11% 

 

41 See Greenhouse Gas Abatement Measures TSD and the State Goal Setting TSD 

42 That is, while the methodology for applying the energy efficiency savings rate was used consistently to set state 

goals and to conduct power sector compliance modeling for each option, the cumulative savings rate is applied 

to 2012 electricity consumption in the calculation of state goals whereas compliance modeling applies that rate 

to forecasted base case demand. Thus, for a given rate of demand reduction, the quantity of electricity demand 

reduced is greater in the compliance modeling than in setting the state goals, consistent with forecasted base case 

demand growth from 2012 to 2020 and beyond. 

43 For more information on load duration curves, see Chapter 2 of EPA’s Base Case using IPM (v5.13) 

documentation, available at: http://www.epa.gov/powersectormodeling/BaseCasev513.html 
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Illinois 4.36% 9.26% 12.03% 3.52% 6.66% 8.44% 

Indiana 3.20% 8.42% 11.59% 2.89% 6.26% 8.24% 

Iowa 4.65% 9.39% 12.04% 3.58% 6.67% 8.40% 

Kansas 1.22% 6.05% 10.17% 0.94% 4.42% 7.14% 

Kentucky 1.91% 6.95% 10.57% 1.63% 5.18% 7.50% 

Louisiana 1.14% 5.88% 9.97% 0.85% 4.28% 6.98% 

Maine 5.37% 9.96% 12.48% 3.61% 6.77% 8.56% 

Maryland 4.21% 9.13% 11.92% 3.47% 6.61% 8.38% 

Massachusetts 4.43% 9.37% 12.18% 3.55% 6.73% 8.54% 

Michigan 4.59% 9.43% 12.16% 3.59% 6.73% 8.51% 

Minnesota 4.80% 9.49% 12.09% 3.58% 6.67% 8.40% 

Mississippi 1.40% 6.28% 10.20% 1.12% 4.62% 7.18% 

Missouri 1.58% 6.60% 10.53% 1.29% 4.88% 7.44% 

Montana 3.36% 8.41% 11.33% 3.01% 6.21% 8.02% 

Nebraska 2.20% 7.38% 10.95% 1.91% 5.51% 7.78% 

Nevada 2.95% 8.07% 11.15% 2.67% 6.00% 7.91% 

New Hampshire 2.84% 8.14% 11.52% 2.56% 6.08% 8.20% 

New Jersey 1.25% 6.10% 10.23% 0.96% 4.46% 7.19% 

New Mexico 3.10% 8.11% 11.03% 2.81% 6.02% 7.82% 

New York 4.42% 9.35% 12.17% 3.54% 6.73% 8.54% 

North Carolina 2.37% 7.45% 10.76% 2.09% 5.56% 7.64% 

North Dakota 1.39% 6.32% 10.35% 1.11% 4.65% 7.28% 

Ohio 4.17% 9.13% 11.97% 3.47% 6.63% 8.43% 

Oklahoma 1.86% 6.88% 10.54% 1.57% 5.13% 7.47% 

Oregon 4.66% 9.26% 11.76% 3.55% 6.55% 8.19% 

Pennsylvania 4.67% 9.42% 12.07% 3.58% 6.68% 8.42% 

Rhode Island 3.90% 9.02% 12.00% 3.35% 6.60% 8.48% 

South Carolina 2.32% 7.40% 10.73% 2.04% 5.52% 7.62% 

South Dakota 1.60% 6.62% 10.52% 1.32% 4.90% 7.43% 

Tennessee 2.21% 7.33% 10.79% 1.93% 5.47% 7.65% 

Texas 1.78% 6.79% 10.48% 1.50% 5.05% 7.42% 

Utah 3.62% 8.62% 11.44% 3.19% 6.33% 8.08% 

Vermont 5.37% 9.96% 12.48% 3.61% 6.77% 8.56% 

Virginia 1.23% 5.98% 9.95% 0.95% 4.37% 6.97% 

Washington 4.24% 9.01% 11.64% 3.45% 6.49% 8.16% 

West Virginia 1.77% 6.86% 10.71% 1.49% 5.11% 7.59% 

Wisconsin 4.68% 9.48% 12.17% 3.60% 6.73% 8.50% 

Wyoming 1.61% 6.55% 10.32% 1.33% 4.85% 7.28% 

Contiguous U.S. Total 3.05% 7.93% 11.14% 2.44% 5.76% 7.83% 

Alaska 1.22% 6.02% 10.09% 0.94% 4.40% 7.08% 

Hawaii 1.29% 6.13% 10.15% 1.01% 4.49% 7.13% 

U.S. Total 3.04% 7.92% 11.13% 2.43% 5.75% 7.83% 

Source: See Greenhouse Gas Abatement Measures TSD 
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3.6.2 Demand-Side Energy Efficiency Total Costs44

Total costs of achieving the demand-side energy efficiency scenarios for each year were 

determined at the state level, exogenous to power sector modeling. In addition to the energy 

savings data, the total cost was based upon first-year cost of saved energy, average measure life, 

distribution of measure lives, and cost escalation factors. 

The first year cost of saved energy used in the cost calculation accounts for both the costs 

to the utilities that are funding the demand-side energy efficiency programs (known as the 

program costs), and the additional cost the end-user purchasing a more energy efficient 

technology (known as the participant costs). Total costs were found to be divided evenly, 50% 

each, between program costs and participant costs.45 To account for the potential for increasing 

costs as states realize greater levels of energy savings, the first-year costs were escalated when 

the annual incremental savings in each state reached 0.5% (a 20% additional cost escalation is 

applied to subsequent investments) and a 1.0% (a 40% additional cost escalation is applied to 

subsequent investments). 

To calculate total annualized energy efficiency costs, first-year costs for each year for 

each state were levelized (at 3% and 7% discount rates) over the estimated distribution of 

measure lives and the results summed for each year for each state. For example, the 2025 

estimate of annualized EE cost includes levelized value of first-year costs for 2017 through 2025. 

The annualized cost is rising in each analysis year as additional first-year costs are incurred. 

These annualized costs were determined for Options 1 and 2 and are summarized below in Table 

3-6. The total levelized cost of saved energy was calculated based upon the same inputs and 

using a 3% discount rate results in average values of 8.5 cents per kWh in 2020, 8.9 cents per 

kWh in 2025, and 9.0 cents per kWh in 2030.46

 

44 For a more detailed discussion of the demand-side energy efficiency savings cost estimates, refer to the 

Greenhouse Gas Abatement Measures TSD. 

45 For a more detailed discussion of the analysis of program versus participant costs, refer to the Greenhouse Gas 

Abatement Measures TSD. 

46 This analysis does not capture the potential effect on the quantity of electricity demand of lower electricity prices 

induced by energy efficiency policies. That is, the modeling does not capture a “system wide” rebound effect of 

energy efficiency policies. This is due to IPM’s assumption of fixed demand. However, the modeling also does 

not capture the effect of higher costs of producing electricity, which is attributable to other methods of 

complying with the state goals, on electricity demand for the same reason (i.e., fixed demand in IPM). For 

further discussion of these issues see the Limitations section at the end of this chapter. 

Comment [A45]: Please add to footnote: See 

Impacts Assessment section, Inputs, Step 3, 

Determine Ratio of Program to Participant costs. 

EPA: Consistent with other footnotes referencing 

GHG Abatement Measures TSD, EPA is not 

referencing specific sections. 

Deleted: cost

Deleted: Results 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

3-16 

The utility funding for demand-side energy efficiency programs (to cover program costs) 

is typically collected through a standard per kWh surcharge to the rate-payer; the regional retail 

price impacts analyzed from this RIA’s compliance scenarios assumes the recovery of these 

program costs through the following procedure.47 For each state, the first-year EE program costs 

are calculated for each year (which are equal to 50% of the total first-year EE costs for that state

as noted above). These EE program costs were distributed between the applicable IPM model 

regions using a distribution approach based on reported sales in 2013 as a proxy for the 

distribution of energy efficiency investment opportunities. These regionalized EE program costs 

were then incorporated into the regional retail price calculation as discussed in Section 3.7.9.

 48 

3.7 Projected Power Sector Impacts 

3.7.1 Projected Emissions 

Under the proposed rule, EPA projects annual CO2 reductions between 17% and 18% 

below base case projections for Option 1 in 2020 (reaching 26% to 27% below 2005 

emissions49), and between 24% and 25% below the base case in 2030 (reaching 30% below 2005 

emissions). For Option 2, EPA projects annual CO2 reductions between 13% and 14% in 2020 

(reaching 23% below 2005 emissions) and between 16% and 17% in 2030 (reaching 22% to 23% 

below 2005 emissions). For each Option, the regional scenario achieves fewer emissions 

reductions largely because the ability to average emissions regionally allows those states that 

were projected to emit below their state goal in the base case to offset reductions that other states 

would otherwise have made. 

 Table 3-4. Projected CO2 Emission Impacts, Relative to Base Case

 CO2 Emissions 

(MM Tonnes) 

CO2 Emissions Change 

from Base Case 

(MM Tonnes) 

CO2 Emissions: 

Percent Change from 

Base Case 

 2020 2025 2030 2020 2025 2030 2020 2025 2030 

Base Case 2,161 2,231 2,256 

 

47 The full retail price analysis method is discussed in Section 3.7.9 of this Chapter. 

48 The effect on equilibrium supply and demand of electricity due to changing retail rates to fund energy efficiency 

programs is not captured in the IPM modeling. 

49 For purposes of these calculations, EPA has used historical CO2 emissions from eGRID for 2005, which reports 

EGU emissions as 2,434 million metric tonnes in the contiguous US. 

Deleted: , equivalent 

Deleted: compliance target

Comment [A46]: Which states have targets 

below their BAU trajectories? Could part of the 

answer also be that the weighted average used to 

calculate the single target for the combined region is 

not based on achieved generation in the modeling? 

EPA: Correct that the state goals are calculated 

based on historical generation, not projected 

generation. 

Deleted: Reductions 

Deleted: Reductions

Deleted: 1

Deleted: rid
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3-17 

Option 1 Regional 1,790 1,730 1,711 -371 -501 -545 -17% -22% -24% 

Option 1 State 1,777 1,724 1,701 -383 -506 -555 -18% -23% -25% 

Option 2 Regional 1,878 1,862 1,903 -283 -368 -353 -13% -17% -16% 

Option 2 State 1,866 1,855 1,882 -295 -376 -373 -14% -17% -17% 

 Source: Integrated Planning Model run by EPA, 2014

 Table 3-5. Projected CO2 Emission Impacts, Relative to 2005 

 CO2 Emissions 

(MM Tonnes) 

CO2 Emissions Change 

from Base Case 

(MM Tonnes) 

CO2 Emissions: 

Percent Change from 

Base Case 

 2020 2025 2030 2020 2025 2030 2020 2025 2030 

Base Case 2,161 2,231 2,256 -273 -203 -178 -11% -8% -7% 

Option 1 Regional 1,790 1,730 1,711 -644 -704 -723 -26% -29% -30% 

Option 1 State 1,777 1,724 1,701 -657 -710 -733 -27% -29% -30% 

Option 2 Regional 1,878 1,862 1,903 -556 -572 -531 -23% -23% -22% 

Option 2 State 1,866 1,855 1,882 -568 -579 -552 -23% -24% -23% 

 Source: Integrated Planning Model run by EPA, 2014 

In 2020, EPA projects a 20% to 23% reduction of SO2, 22% to 24% reduction of NOX, 

and a 15% to 18% reduction of mercury, under the proposed Option 1 illustrative scenarios. 

EPA projects fewer emission reductions overall as a result of the proposed Option 2 in 2020: a 

17% to 18% reduction in SO2, 17% to 18% reduction in NOX, and an 11% to 14% reduction in 

mercury. The projected non-CO2 reductions presented in Table 3-6 below demonstrate similar 

trends in 2025 and 2030. 

 Table 3-6. Projected Non-CO2 Emission Impacts, 2020-2030 

 Base 

Case 

Option 1 Option 2 Option 1 Option 2 

 Reg. State Reg. State Reg. State Reg. State 

2020 

SO2

(thousand tons) 1,476 1,184 1,140 1,231 1,208 -19.8% -22.7% -16.6% -18.1% 

NOX

(thousand tons) 1,559 1,213 1,191 1,290 1,277 -22.2% -23.6% -17.2% -18.0% 

Hg 

(tons) 8.3 7.0 6.8 7.3 7.1 -15.3% -18.1% -11.3% -14.0% 

PM2.5

(thousand tons) 212 156 154 166 163 -26.4% -27.2% -21.5% -22.9%

2025 

SO2

(thousand tons) 1,515 1,120 1,090 1,218 1,188 -26.1% -28.0% -19.6% -21.6% 

Deleted: Reductions

Deleted: Reductions

Deleted: as a result

Deleted: of 

Deleted: s

Deleted: Reductions
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NOX

(thousand tons) 1,587 1,166 1,151 1,279 1,271 -26.5% -27.5% -19.4% -19.9% 

Hg 

(tons) 8.7 7.0 6.7 7.4 7.1 -19.5% -23.2% -14.9% -19.3% 

PM2.5

(thousand tons) 209 150 146 165 161 -28.1% -30.1% -21.0% -23.2%

2030 

SO2

(thousand tons) 1,530 1,106 1,059 1,243 1,209 -27.7% -30.8% -18.8% -21.0% 

NOX

(thousand tons) 1,537 1,131 1,109 1,286 1,264 -26.4% -27.9% -16.4% -17.8% 

Hg 

(tons) 8.8 7.0 6.6 7.7 7.2 -19.7% -24.1% -12.5% -17.6% 

PM2.5

(thousand tons) 198 144 142 158 154 -27.2% -28.5% -20.3% -22.1%

 Source: Integrated Planning Model run by EPA, 2014 

While the EPA has not quantified the climate impacts of these other pollutants for the 

proposed guidelines, the Agency has analyzed the potential changes in upstream methane 

emissions from the natural gas and coal production sectors that may result from the compliance 

approaches examined in this RIA. The EPA assessed whether the net change in upstream 

methane emissions from natural gas and coal production is likely to be positive or negative and 

also assessed the potential magnitude of changes relative to CO2 emissions reductions anticipated 

at power plants. This assessment included CO2 emissions from the flaring of methane, but did 

not evaluate potential changes in other combustion-related CO2 emissions, such as emissions 

associated with drilling, mining, processing, and transportation in the natural gas and coal 

production sectors. This analysis found that the net upstream methane emissions from natural gas 

systems and coal mines and CO2 emissions from flaring of methane will likely decrease under 

the proposed guidelines. Furthermore, the changes in upstream methane emissions are small 

relative to the changes in direct emissions from power plants. The technical details supporting 

this analysis can be found in the Appendix to this chapter. 

3.7.2 Projected Compliance Costs 

The power industry’s “compliance costs” are represented in this analysis as the change in 

electric power generation costs between the base case and policy case in which the sector 

pursues flexible compliance approaches to meet the proposed rule as represented in the 

illustrative compliance scenarios. In simple terms, these costs are the resource costs of what the 

Deleted: CH4

Comment [A47]: Please present total costs 

without fuel savings incorporated. Fuel savings 

should be presented the benefits section. 

EPA: It is not clear what is meant by fuel savings. 

There are two primary costs to the proposal; system 

costs for the power sector, and the additional 

expenditures on EE. The costs reflected show the 

combined effect of these two elements, on an 

annualized basis. We have also captured the 

electricity savings by estimating the average electric 

bill impacts, in addition to the retail electricity price 

estimates. The EE costs are also broken out in the 

RIA, should one want to see those in isolation. 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

3-19 

power industry will expend to comply with EPA’s requirements. 50 Program and participant enduse EE costs are also included in the compliance cost estimates. 

EPA projects that the annual compliance cost of the proposed rule’s Option 1 ranges from 

$5.4 to $7.4 billion in 2020 and from $7.3 to $8.8 billion in 2030. The projected annual 

incremental compliance cost of the proposed rule’s Option 2 ranges from $4.2 to $5.4 billion in 

2020 and from $1.9 to $3.1 billion in 2030. The annual compliance cost is the projected 

additional cost of complying with the proposed rule in the year analyzed and includes the net 

change in the annualized cost of capital investment in new generating sources and heat rate 

improvements at coal steam facilities,51 the change in the ongoing costs of operating pollution 

controls, shifts between or amongst various fuels, demand-side energy efficiency measures, and 

other actions associated with compliance. 

 Table 3-7. Annualized Compliance Costs (billions of 2011$) 

 2020 2025 2030 

Option 1 Regional 5.4 4.6 7.3 

Option 1 State 7.4 5.5 8.8 

Option 2 Regional 4.2 4.5 1.9 

Option 2 State 5.4 5.5 3.1 

 Source: Integrated Planning Model run by EPA, 2014 and GHG Abatement Measures 

TSD

EPA’s projection of $4.2 to $7.4 billion in additional costs in 2020 across the illustrative 

compliance scenarios evaluated for both options should be put into context for power sector 

operations. As shown in section 2.7, the power sector is expected in the base case to expend over 

$359 billion in 2020 to generate, transmit, and distribute electricity to end-use consumers. 

Therefore, the projected costs of compliance with the proposed rule amount to a one to two 

percent increase in the cost to meet electricity demand, while securing public health and welfare 

benefits that are several times more valuable (as described in Chapters 4 and 8). 

 

50 The compliance costs also capture the effect of changes in equilibrium fuel prices on the expenditures of the 

electricity sector to serve demand. 

51 See Chapter 2 of the Greenhouse Gas Abatement Measures TSD and Chapter 8 of EPA’s Base Case using IPM 

(v5.13) documentation, available at: http://www.epa.gov/powersectormodeling/BaseCasev513.html 

Deleted: incremental 

Deleted: incremental 

Deleted: final 

Deleted: additional 

Deleted: .
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3-20 

The annual compliance costs presented in Table 3-7 include the exogenously determined 

annualized total cost of demand-side energy efficiency measures, presented here in Table 3-8.

Error! Reference source not found. provides the total first-year or “up front” cost of demandside energy efficiency measures.

Table 3-8. Annualized Cost of Demand-Side Energy Efficiency (at discount rates of 3% 

and 7%, billions 2011$) 

 2018 2020 2025 2030 

Option 1 at 3% 4.1 10.2 28.9 42.7 

Option 1 at 7% 4.9 12.3 35.0 51.8 

Option 2 at 3% 3.6 8.0 20.6 29.8 

Option 2 at 7% 4.3 9.7 24.9 36.1 

Source: Greenhouse Gas Abatement Measures TSD 

The following example uses results from Option 1 Regional scenario in the year 2020 to 

illustrate how different components of estimated expenditures are combined to form the full 

compliance costs presented in Table 3-6. Comparing the IPM modeling results in 2020 for this 

scenario to results from the base case, one can see an incremental decline of $4.8 billion in the 

annualized expenditures required to supply enough electricity to meet demand. This incremental 

decline is a net outcome of two simultaneous forces having opposite effects. Imposing the CO2

constraints represented in the Option 1 Regional scenario on electric generators would, ceteris 

paribus, yield an incremental increase in expenditures to supply a given level of 

electricity. However, the IPM modeling also reflects a substantial reduction in electricity 

demand as a result of end-use energy efficiency (EE) improvements, which necessarily results in 

substantial reductions in the expenditures needed to supply a correspondingly lower amount of 

electricity. The incremental decline in IPM-modeled expenditures shows that before the 

expenditures to reduce electricity demand through end-use energy efficiency are taken into 

account, the reduced expenditures of electricity supply (due to EE) outweigh the increased 

expenditures to meet the policy’s CO2 constraints, such that the net outcome is a decline of $4.8 

billion in annualized expenditures to supply electricity in 2020.

In order to reflect the full compliance cost attributable to the policy, it is necessary to pair 

this incremental -$4.8 billion in electricity supply expenditures with the annualized expenditures 

needed to secure the end-use energy efficiency improvements. EPA has estimated these EErelated expenditures to be $10.2 billion in 2020 (using a 3% discount rate). As a result, this 

analysis finds the cost of the Option 1 Regional scenario in 2020 to be $5.4 billion (the sum of 

incremental supply-related and demand-related expenditures). 

Table 3-9. Total Power Sector Generating Costs (IPM) (billions 2011$) 

2020 2025 2030 

Base Case $177.8 $202.9 $224.7 

Option 1 Regional $173.0 $178.6 $189.2 

Option 1 State $175.0 $179.5 $190.7 

Option 2 Regional $174.0 $186.9 $196.8 

Deleted: Table 3-65

Deleted: 6Table 3-10

Deleted: Table 3-7

Deleted: ¶

Deleted: Table 

Deleted: Total Gross 
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3-21 

Option 2 State $175.2 $187.8 $198.0 

3.7.3 Projected Compliance Actions for Emissions Reductions 

Heat rate improvements (HRI). EPA analysis assumes that the existing coal steam electric 

generating fleet has, on average, the ability to improve operating efficiency (i.e., reduce the 

average net heat rate, or the Btu of fuel energy needed to produce one kWh of net electricity 

output). All else held constant, HRI allow the EGU to generate the same amount of electricity 

using less fuel. The decrease in required fossil fuel results in a lower output-based CO2 emissions 

rate (lbs/MWh), as well as a lower variable cost of electricity generation. In the modeling 

conducted for these compliance scenarios, coal boilers have the choice to improve heat rates by 

6% under Option 1 and 4% under Option 2, at capital cost of $100 per kW in both options.52

The vast majority of existing coal boilers are projected to adopt the aforementioned heat 

rate improvements. EPA projects that 176 to 179 GW of existing coal steam capacity (greater 

than 25 MW) will improve operating efficiency (i.e., reduce the average net heat rate) under 

Option 1 in 2020. Under Option 2, EPA projects that 168 to 185 GW of existing coal steam 

capacity with improve operating efficiency in 2020. 

Re-dispatch. Another approach for reducing the average emission rate from existing units is to 

shift some generation from more CO2-intensive generation to less CO2-intensive generation. 

Compared to the Base Case, existing coal steam capacity is projected to operate at a lower 

capacity factor for both Option 1 and Option 2, on average, although projected average capacity 

factors for existing coal steam boilers remains around 75% across scenarios. Existing natural gas 

combined cycle units, which are less carbon-intensive than coal steam capacity on an output 

basis, operate at noticeably higher capacity factor in Options 1 and 2, on average. See Table 3-

10. The utilization of existing natural gas combined cycle capacity is lower than 70% on an 

annual average basis in these illustrative compliance scenarios, reflecting the fact that states have 

the flexibility to choose among alternative CO2 reduction strategies that were part of BSER, 

instead of employing re-dispatch to the maximum extent. In addition, future electric demand is 

considerably lower than the Base Case. 

Table 3-10. Projected Capacity Factor of Existing Coal Steam and Natural Gas Combined 

Cycle Capacity 

 Existing Coal Steam Existing Natural Gas 

Combined Cycle 

 2020 2025 2030 2020 2025 2030 

Base Case 78% 80% 79% 52% 48% 42% 

Option 1 Regional 77% 74% 73% 55% 54% 50% 

Option 1 State 76% 74% 73% 56% 55% 51% 

 

52 The option for heat rate improvement is only made available in the illustrative scenarios for Options 1 and 2, and 

is not available in the base case. See Technical Support Document – GHG Abatement Measures. 

Deleted: ¶

<#>¶
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3-22 

Option 2 Regional 75% 74% 76% 57% 55% 49% 

Option 2 State 75% 73% 76% 57% 56% 49% 

 Source: Integrated Planning Model run by EPA, 2014 

Demand-Side Energy Efficiency. Another approach for reducing the average emission rate is to 

consider reductions in load attributable to demand-side energy efficiency savings, which will 

reduce the need for higher emitting generation.53 In the compliance scenario analyses presented 

in this RIA, each state is credited for total demand-side energy efficiency savings consistent with 

the savings that are used to construct the state goals. See section 1 for a description of the levels 

assumed for Options 1 and 2. Again, these reductions in demand as a result of demand-side 

energy efficiency are made exogenously in both of the Options for the illustrative scenarios 

analyzed. 

3.7.4 Projected Generation Mix 

Table 3-11 and Figure 3-7 show the generation mix in the base case and under the 

proposed rule. The ability to average the emissions rate at covered sources (which exclude new 

NGCC) over the 2020-2030 compliance period provides an incentive to shift generation within 

the covered sources to less carbon-intensive generation. In 2020, for Option 1, total generation 

declines approximately three percent under Option 1 as a result of the reduction in total demand 

attributable to the demand-side energy savings applied in the illustrative scenarios. Coal-fired 

generation is projected to decline 20% to 22% in 2020, and natural-gas-fired generation from 

existing combined cycle capacity is projected to increase four to six percent relative to the base 

case under Option 1. In 2030, the cumulative demand-side energy savings under the Option 1 

result in an 11% reduction in total generation relative to the base case. The coal-fired fleet in 

2030 generates between 25% and 27% less than in the base case, while natural-gas-fired 

generation from existing combined cycles increases 18% to 19% relative to the base case. Gasfired generation from new combined cycle capacity increases in 2020, as projected new natural 

gas combined cycle capacity replaces retired coal capacity. By 2030, generation from newly 

built natural gas combined cycle decreases between 36% and 40% relative to the base case, 

consistent with the decrease in new capacity (see section 0). Generation from non-hydro 

renewables increases two percent relative to the base case in 2030. 

 

53 Because fossil fuel-fired EGUs typically have higher variable costs than other EGUs (such as nuclear and 

renewable EGUs), they are typically the first to be displaced when demand is reduced. The influence of EE on 

new sources of generation depends on both their relative variable and capital costs. 54 For more detail on IPM’s 

electric load modeling and power system operation, please see IPM documentation 

(http://www.epa.gov/powersector modeling). 

Deleted: output-based 

Deleted: the 

Deleted: equal to the levels 

Deleted: that are assumed 

Deleted: in 

Deleted: o

Deleted: and 

Deleted: under the proposed rule

Deleted: ¶
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

3-23 

Similar trends are projected for Option 2. In 2020, total generation declines two percent 

under Option 2 as a result of the reduction in total demand attributable to the demand-side energy 

savings applied in the illustrative scenarios. Coal generation is projected to decrease between 

16% and 17% in 2020, and natural gas-fired generation from existing combined cycle units is 

projected to increase nine percent, relative to the base case. 

Under both options, additional natural gas pipeline capacity is projected to be built 

through 2020 relative to the base case. In all of the illustrative compliance scenarios, pipeline 

capacity is projected to increase four to eight percent beyond base case projections by 2020. In 

2030, however, the total cumulative pipeline capacity built is projected to decrease under both 

options, consistent with the projected decrease in total natural gas use. The projected increase in 

pipeline capacity in the near term is largely the result of building pipeline capacity a few years 

earlier than in is projected in the base case. Given the relatively small amount of additional 

infrastructure development that is projected to shift to earlier years, construction of this 

additional capacity should be easily manageable and not raise any reliability or cost concerns. 

Deleted: under the proposed rule
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3-24 

Table 3-11. Generation Mix (thousand GWh) 

Base 

Case 

Option 1 Option 2 Option 1 Option 2 

 Reg. State Reg. State Reg. State Reg. State 

2020 

Pulverized Coal 1,665 1,337 1,302 1,406 1,375 -20% -22% -16% -17% 

NG Combined Cycle 

(existing) 1,003 1,043 1,065 1,093 1,091 4% 6% 9% 9% 

NG Combined Cycle 

(new) 85 238 248 155 185 181% 192% 83% 119% 

Combustion Turbine 19 33 33 33 32 74% 76% 75% 67% 

Oil/Gas Steam 52 15 14 18 16 -70% -73% -65% -69% 

Non-Hydro Renewables 299 321 323 313 316 7% 8% 5% 5% 

Hydro 280 282 281 282 281 1% 1% 1% 1% 

Nuclear 817 817 819 814 819 0% 0% 0% 0% 

Other 8 15 14 13 12 92% 88% 66% 61% 

Total 4,227 4,102 4,100 4,128 4,128 -3% -3% -2% -2% 

2025 

Pulverized Coal 1,702 1,275 1,250 1,383 1,353 -25% -27% -19% -20% 

NG Combined Cycle 

(existing) 919 1,022 1,035 1,055 1,068 11% 13% 15% 16% 

NG Combined Cycle 

(new) 280 257 266 218 231 -8% -5% -22% -17% 

Combustion Turbine 27 37 37 37 37 36% 39% 36% 36% 

Oil/Gas Steam 37 13 15 16 16 -64% -59% -56% -58% 

Non-Hydro Renewables 335 347 346 342 341 4% 3% 2% 2% 

Hydro 280 282 281 282 282 1% 0% 0% 0% 

Nuclear 817 817 819 814 819 0% 0% 0% 0% 

Other 6 13 11 11 10 115% 86% 71% 64% 

Total 4,404 4,063 4,062 4,158 4,156 -8% -8% -6% -6% 

2030 

Pulverized Coal 1,668 1,249 1,216 1,419 1,377 -25% -27% -15% -17% 

NG Combined Cycle 

(existing) 810 955 961 932 936 18% 19% 15% 16% 

NG Combined Cycle 

(new) 599 359 384 372 409 -40% -36% -38% -32% 

Combustion Turbine 23 32 31 30 25 43% 35% 32% 12% 

Oil/Gas Steam 23 10 12 14 13 -57% -46% -40% -42% 

Non-Hydro Renewables 350 356 356 355 353 2% 2% 1% 1% 

Hydro 280 281 280 281 281 0% 0% 0% 0% 

Nuclear 797 796 797 793 797 0% 0% -1% 0% 

Other 6 16 14 13 12 163% 132% 109% 94% 

Total 4,557 4,054 4,051 4,206 4,205 -11% -11% -8% -8% 

Note: “Other” mostly includes MSW and fuel cells. Source: Integrated Planning Model run by EPA, 2014

Comment [A48]: Why do renewables not 

increase by more in any of the analysis years? Based 

on the state goals I would have expected renewable 

generation to rise by quite a more. 

EPA: Generation from both non-hydro renewables 

and existing NGCC increases as part of the model’s 

solution to meeting each state’s average emissions 

rate. At the level of CO2 reductions in these 

scenarios, and with the projected fuel prices and 

capital costs for construction of new renewables, it 

makes sense that existing NGCC capacity is 

generally more competitive than new non-hydro 

renewables. 

Also, note that demand is decreasing relative to the 

base case – so any generation increase relative to the 

base represents an even greater increase in total 

generation share. 

But still renewable generation only increase by 1.7% 

(6/350) over the baseline in 2030. How can this be 

explained when BB 3 at least seems to require more 

than a 1.7% increase in renewable generation? Is 

BB 3 just not binding for most states? Is most of the 

incremental renewable generation just in the 

baseline? 

EPA: While the state goals are based on the 

technologies specified in the building blocks, no 

individual building block binds state actions for 

compliance. EPA modelling projections suggest that 

state goals can be met cost-effectively through a 

variety of different compliance mechanisms. 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

3-25 

Figure 3-7. Generation Mix with the Base Case and 111(d) Options, 2020-2030 (million GWh) Source: Integrated Planning Model run by EPA, 2014 

0.000.501.001.502.002.503.003.504.004.505.00

Base

Case

Reg. State Reg. State Base

Case

Reg. State Reg. State Base

Case

Reg. State Reg. State

OtherOilNon‐hydroRenewablesHydroelectricNatural GasNuclearCoal

2020 2025 2030

Option 1 Option 2 Option 1 Option 2 Option 1 Option 2
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3-1 

3.7.5 Projected Incremental Retirements 

Relative to the base case, about 30 to 49 GW of coal-fired capacity is projected to be 

uneconomic to maintain (about 12% to 19% of all coal-fired capacity projected to be in service 

in the base case) by 2020 under the range of scenarios analyzed. 

For the proposed rule, EPA examined whether these projected incremental retirements 

may adversely impact reserve margins and reliability planning. The IPM model is designed to 

ensure that generation resource adequacy is maintained in the projected results, and the model is 

required to meet reserve margin requirements in the 64 modeling regions in the contiguous US 

by retaining enough existing capacity and/or building enough new capacity. IPM also addresses 

reliable delivery of generation resources at a regional level by limiting the ability to transfer 

power between regions using the bulk power transmission system. Within each model region, 

IPM assumes that adequate transmission capacity is available to deliver any resources located in, 

or transferred to, the region.54

EPA examined the implications of each of the scenarios for regional resource adequacy 

and for potential concerns over on grid reliability. To conduct this analysis, EPA examined key 

parameters from the IPM projections to assess whether concerns over regional resource adequacy 

would be likely to arise or whether changes in generation and flow pattern impacts would raise 

issues for reliability management. The key parameters analyzed were: 

Operating Reserve Margins. The IPM model ensures that target reserve margins from NERC 

will be met, by maintaining existing capacity or by building additional new capacity if needed. 

Capacity that is otherwise uneconomic to operate will be retired only when planned reserve 

margins can be met from within the region or by transfers from other regions. 

Operational Capacity. Since IPM ensures that NERC target margins will be met, EPA analyzed 

the remaining operating capacity for 2020 through 2030 to determine what types of changes in 

the generation fleet were projected to occur through retirements, additional generation and 

energy efficiency. Although there were changes from the base case to the policy cases, none of 

the policy cases were found to raise concerns over regional resource adequacy. Moreover, the 

time horizon for compliance with this rule will permit environmental and reliability planners to 

coordinate these changes and address potential concerns before they arise. 

Interregional Power Flows and Capacity Transfers. IPM constrains both interregional energy 

flows and interregional transfers of capacity to meet reserve requirements. These limits are based 

on grid operator data from ISOs, RTOs and other planning entities. Although these limits keep 

projected flows within expected bounds, EPA further examined how the policy options impacted 

 

54 For more detail on IPM’s electric load modeling and power system operation, please see IPM documentation 

(http://www.epa.gov/powersector modeling). 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

3-2 

these flows and transfers to identify any large shifts from the base case. None of the interregional 

changes in the policy cases suggested that there would be increases in flows that would raise 

significant concerns about grid congestion or grid management. 

The increased energy efficiency anticipated with the proposed rule also contributes to 

meeting resource adequacy, by lowering the regional load and thereby lowering operating 

capacity needed to meet planning reserve margins. Demand-side energy efficiency would also 

reduce the overall load on the grid and thus generally reduces the burden on the transmission 

infrastructure needed to maintain reliability. EPA concludes that the proposed rule will not raise 

significant concerns over regional resource adequacy or raise the potential for interregional grid 

problems. EPA believes any remaining local issues can be managed through standard reliability 

planning processes.55

Capacity changes from the base case in 2020 are shown in Table 3-12. 

 

55 For further discussion of EPA’s examination of these projected incremental retirements on reserve margins and 

reliability planning, see the Resource Adequacy and Reliability Analysis TSD. 

Deleted: E

Deleted: s

Deleted: Resources Adequacy 
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3-3 

 Table 3-12. Total Generation Capacity by 2020-2030 (GW) 

Base 

Case 

Option 1 Option 2 Option 1 Option 2 

 Reg. State Reg. State Reg. State Reg. State 

2020 

Pulverized Coal 244 198 195 214 211 -19% -20% -12% -14% 

NG Combined Cycle (existing) 219 216 217 218 218 -1% -1% -1% 0% 

NG Combined Cycle (new) 12 33 35 21 26 174% 190% 79% 117% 

Combustion Turbine 146 144 143 146 145 -2% -2% -1% -1% 

Oil/Gas Steam 83 66 66 72 71 -20% -20% -13% -14% 

Non-Hydro Renewables 93 105 105 101 102 13% 13% 9% 10% 

Hydro 101 101 101 101 101 0% 0% 0% 0% 

Nuclear 103 103 103 103 103 0% 0% 0% 0% 

Other 5 5 5 5 5 2% 2% 2% 2% 

Total 1,005 971 970 981 981 -3% -3% -2% -2% 

2025 

Pulverized Coal 243 197 193 214 211 -19% -21% -12% -13% 

NG Combined Cycle (existing) 219 216 217 218 218 -1% -1% -1% 0% 

NG Combined Cycle (new) 39 34 36 30 32 -11% -7% -23% -18% 

Combustion Turbine 149 145 144 148 147 -3% -3% -1% -2% 

Oil/Gas Steam 82 65 66 72 71 -20% -19% -12% -13% 

Non-Hydro Renewables 103 113 112 110 110 10% 8% 7% 7% 

Hydro 101 101 101 101 101 0% 0% 0% 0% 

Nuclear 103 103 103 103 103 0% 0% 0% 0% 

Other 5 5 5 5 5 2% 2% 2% 2% 

Total 1,044 980 977 1,000 997 -6% -6% -4% -4% 

2030 

Pulverized Coal 240 195 191 212 208 -19% -21% -12% -13% 

NG Combined Cycle (existing) 219 216 217 218 218 -1% -1% -1% 0% 

NG Combined Cycle (new) 84 49 52 53 58 -42% -38% -36% -31% 

Combustion Turbine 156 146 145 150 149 -7% -7% -4% -5% 

Oil/Gas Steam 82 65 66 72 71 -20% -19% -12% -13% 

Non-Hydro Renewables 107 117 115 113 114 9% 7% 6% 6% 

Hydro 101 101 101 101 101 0% 0% 0% 0% 

Nuclear 101 100 101 100 101 0% 0% -1% 0% 

Other 5 5 5 5 5 2% 2% 2% 2% 

Total 1,095 994 992 1,023 1,024 -9% -9% -7% -6% 

Source: Integrated Planning Model run by EPA, 2014 

3.7.6 Projected Capacity Additions 

Due largely to the demand reduction attributable to the demand-side energy savings 

applied in the illustrative scenarios, EPA projects less new natural gas combined cycle capacity 

Deleted: a low growth rate anticipated for future 

electricity demand levels in the latest 2013 EIA 

forecast, and 

Deleted: under the proposed rule
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built under the proposed rule than is built in the base case over the time horizon presented in this 

RIA. While this new NGCC capacity cannot be directly counted towards the average emissions 

rate used for compliance, it can displace some generation from covered sources and thus 

indirectly lower the average emissions rate from covered sources. Conversely, EPA projects an 

overall increase in new non-hydro renewable capacity. As affected sources in the illustrative 

scenarios, the generation from new non-hydro renewables are able to contribute to the average 

emissions rate in each state or region. 

Under the Option 1 illustrative scenarios, new natural gas combined cycle capacity is 

projected to increase by 21 to 23 GW in 2020 (174% to 190% increase relative to the base case), 

and decrease by 32 to 35 GW (38% to 42% reduction relative to base case) by 2030. New nonhydro renewable capacity is projected to increase by about 12 GW (67% increase) above the 

base case in 2020, and 8 to 9 GW (24% to 28% increase) by 2030. 

Under the Option 2 illustrative scenarios, new natural gas combined cycle capacity is 

projected to increase by about 9 to 14 GW (79% to 117% increase relative to base case) in 2020, 

and decrease between 26 and 31 GW (31% to 37% reduction) in 2030. New non-hydro 

renewable capacity is projected to increase by about 9 GW (50% increase) above the base case in 

2020, and about 6 GW (18% increase) by 2030. 

 Table 3-13. Projected Capacity Additions, Gas (GW) 

 Cumulative Capacity Additions: 

Gas Combined Cycle 

Incremental Cumulative 

Capacity Additions: Gas 

Combined Cycle 

 2020 2025 2030 2020 2025 2030 

Base Case 11.9 38.9 83.8 

Option 1 Regional 32.7 34.4 49.0 20.8 -4.4 -34.8 

Option 1 State 34.7 36.1 51.6 22.7 -2.7 -32.1 

Option 2 Regional 21.4 30.0 53.2 9.4 -8.9 -30.6 

Option 2 State 25.9 32.0 57.8 14.0 -6.8 -26.0 

 Source: Integrated Planning Model run by EPA, 2014 

 

Deleted: under the proposed rule

Comment [A50]: To add to this explanation: 

And, if new NGCC is constructed in a state, then 

although this new MegaWattage cannot be counted 

directly in the compliance math toward achieving 

the state goal, the impact of this new NGCC in 

potentially drawing down generation and lowering 

the emission rate from covered sources could assist 

in state compliance. Correct? 

EPA: See new text in previous paragraph. 
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 Table 3-14. Projected Capacity Additions, Non-hydro Renewable (GW) 

 Cumulative Capacity Additions: 

Renewables 

Incremental Cumulative 

Capacity Additions: Renewables 

 2020 2025 2030 2020 2025 2030 

Base Case 17.8 28.4 32.7 

Option 1 Regional 29.9 38.4 41.9 12.1 9.9 9.2 

Option 1 State 29.6 37.0 40.6 11.8 8.5 7.9 

Option 2 Regional 26.4 35.5 38.5 8.6 7.1 5.8 

Option 2 State 26.7 35.0 38.7 8.8 6.6 6.0 

 Source: Integrated Planning Model run by EPA, 2014 

3.7.7 Projected Coal Productions for the Electric Power Sector 

Coal production is projected to decrease in 2020 and beyond in the illustrative scenarios 

due to (1) improved heat rates (generating efficiency) at existing coal units, (2) demand 

reduction attributable to the demand-side energy savings, and (3) a shift in generation from coal 

to less-carbon intensive generation. As shown in Table 3-15, the largest decrease in 

coal production is projected to occur in the western region. Waste coal production is projected to 

increase slightly under the proposed rule due to the operation under both options of less than 1 

GW of coal steam capacity that is projected to retire under the base case. 

 Table 3-15. Coal Production for the Electric Power Sector, 2020 

 Coal Production (MM Tons) Percent Change from Base Case 

 Base 

Case 

Option 1 Option 2 Option 1 Option 2 

 Reg. State Reg. State Reg. State Reg. State 

Appalachia 140 87 91 97 100 -37% -35% -30% -28% 

Interior 249 231 222 234 226 -7% -11% -6% -9% 

West 446 308 292 343 332 -31% -34% -23% -26% 

Waste Coal 9 10 10 11 11 8% 5% 15% 16% 

Imports 0 0 0 0 0 

Total 844 636 616 684 668 -25% -27% -19% -21% 

 Source: Integrated Planning Model run by EPA, 2014 

Power sector natural gas use is projected to increase between 12% and 14% in 2020 under 

Option 1 and between 10% and 12% under Option 2. In later years, gas use declines under both 

options. These trends are consistent with the change in generation mix described above in 

section 0. 

Deleted: under the proposed rule
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 Table 3-16. Power Sector Gas Use 

 Power Sector Gas Use 

(TCF) 

Percent Change in Power 

Sector Gas Use 

 2020 2025 2030 2020 2025 2030 

Base Case 8.35 8.88 9.89 

Option 1 Regional 9.32 9.31 9.37 11.7% 4.8% -5.3% 

Option 1 State 9.54 9.52 9.61 14.3% 7.2% -2.9% 

Option 2 Regional 9.20 9.34 9.30 10.2% 5.1% -6.0% 

Option 2 State 9.35 9.52 9.53 12.0% 7.2% -3.7% 

 Source: Integrated Planning Model run by EPA, 2014 

3.7.8 Projected Fuel Price Impacts 

The impacts of the proposed rule on coal and natural gas prices before shipment are 

shown below in Table 3-17, Table 3-18, Table 3-19, and 

Table 3-20 and are attributable to the policy-induced changes in overall power sector demand for 

each fuel. 

Coal demand decreases over the 2020-2030 time horizon, resulting in a decrease in the 

price of coal delivered to the electric power sector. In 2020, the increase in natural gas demand 

results in an increase in the price of gas delivered to the electric power sector. In 2030, gas 

demand and price decrease below the base case projections, due to the cumulative impact of 

national demand-side energy efficiency savings and the consequent reduced overall electricity 

demand. 

IPM modeling of natural gas prices uses both short- and long-term price signals to 

balance supply and demand for the fuel across the modeled time horizon. As such, it should be 

understood that the pattern of IPM natural gas price projections over time is not a forecast of 

natural gas prices incurred by end-use consumers at any particular point in time. The natural gas 

market in the United States has historically experienced some degree of price volatility from year 

to year, between seasons within a year, and during short-lived weather events (such as cold snaps 

leading to short-run spikes in heating demand). These short-term price signals are fundamental 

for allowing the market to successfully align immediate supply and demand needs. However, 

end-use consumers are typically shielded from experiencing these rapid fluctuations in natural 

gas prices by retail rate regulation and by hedging through longer-term fuel supply contracts by 
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3-7 

the power sector. IPM assumes these longer-term price arrangements take place “outside of the 

model” and on top of the “real-time” shorter-term price variation necessary to align supply and 

demand. Therefore, the model’s natural gas price projections should not be mistaken for 

traditionally experienced consumer price impacts related to natural gas, but a reflection of 

expected average price changes over the period of time represented by the modeling horizon. 

Table 3-17. Projected Average Minemouth and Delivered Coal Prices (2011$/MMBtu) 

 Minemouth Delivered - Electric Power Sector 

 2020 2025 2030 2020 2025 2030 

Base Case 1.73 1.88 2.06 2.62 2.80 2.98 

Option 1 Regional 1.46 1.57 1.72 2.19 2.29 2.44 

Option 1 State 1.45 1.56 1.70 2.18 2.30 2.44 

Option 2 Regional 1.49 1.62 1.77 2.25 2.40 2.56 

Option 2 State 1.49 1.62 1.76 2.26 2.41 2.56 

 Source: Integrated Planning Model run by EPA, 2014 

Table 3-18. Projected Average Minemouth and Delivered Coal Prices: Percent Change 

from Base Case Projections 

 Minemouth Delivered - Electric Power Sector 

 2020 2025 2030 2020 2025 2030 

Option 1 Regional -15.5% -16.6% -16.4% -16.3% -18.3% -18.1% 

Option 1 State -16.1% -17.0% -17.6% -16.5% -17.9% -18.2% 

Option 2 Regional -14.1% -14.1% -14.2% -13.8% -14.4% -14.2% 

Option 2 State -14.0% -14.1% -14.6% -13.6% -14.1% -14.2% 

 Source: Integrated Planning Model run by EPA, 2014 

Table 3-19. Projected Average Henry Hub (spot) and Delivered Natural Gas Prices 

(2011$/MMBtu) 

 Henry Hub Delivered - Electric 

Power Sector 

 2020 2025 2030 2020 2025 2030 

Base Case 4.98 5.68 6.00 5.36 6.11 6.39 

Option 1 Regional 5.50 5.60 6.02 5.86 5.91 6.33 

Option 1 State 5.61 5.57 6.07 5.98 5.90 6.39 

Option 2 Regional 5.40 5.79 5.85 5.76 6.13 6.18 

Option 2 State 5.43 5.80 5.86 5.80 6.16 6.22 

 Source: Integrated Planning Model run by EPA, 2014 
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Table 3-20. Average Henry Hub (spot) and Delivered Natural Gas Prices: Percent Change 

from Base Case Projections 

 Henry Hub Delivered - Electric 

Power Sector 

 2020 2025 2030 2020 2025 2030 

Option 1 Regional 10.4% -1.5% 0.4% 9.3% -3.3% -0.9% 

Option 1 State 12.5% -2.0% 1.2% 11.5% -3.5% 0.0% 

Option 2 Regional 8.5% 2.0% -2.5% 7.5% 0.2% -3.2% 

Option 2 State 9.0% 2.1% -2.3% 8.1% 0.8% -2.6% 

 Source: Integrated Planning Model run by EPA, 2014 

3.7.9 Projected Retail Electricity Prices 

EPA’s analysis projects an increase in the national average (contiguous U.S.) retail 

electricity price between 5.9% and 6.5% in 2020 and between 2.7% and 3.1% by 2030 under the 

proposed Option 1, compared to the modeled base case price estimate in those years. Under 

Option 2, on average, EPA projects an average retail price increase ranging from 3.6% to 4.0% 

in 2020, and from 1.1% to 1.4% in 2030. 

Retail electricity prices embody generation, transmission, distribution, taxes, and utility 

demand-side EE program costs. IPM modeling projects changes in regional wholesale power 

prices and capacity payments related to imposition of the represented policy that are combined 

with EIA regional transmission and distribution costs to calculate changes to regional retail 

prices. As described in Section 3.6.2, the utility funding for demand-side energy efficiency 

programs (to cover program costs) is typically collected through a standard per kWh surcharge to 

the ratepayer and the regional retail price impacts assume that first-year costs of these policies 

are recovered by utilities in retail rates. There are many factors influencing the estimated retail 

electricity price impacts, namely projected changes in generation mix, fuel prices, and 

development of new generating capacity. These projected changes vary regionally under each 

compliance scenario in response to the goals under the two options, and they also vary depending 

upon retail electricity market structure (e.g., cost-of-service vs. competitive).

Table 3-21. 2020 Projected Contiguous U.S. and Regional Retail Electricity Prices 

(cents/kWh) 

 2020 Projected Retail Price (cents/kWh) Percent Change from Base Case 

Deleted: 

Deleted: -

Deleted: 

Deleted: option 

Deleted: can 
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3-9 

 

Base 

Case 

Option 1 

Regional 

Option 1 

State 

Option 2 

Regional 

Option 2 

State 

Option 1 

Regional 

Option 1 

State 

Option 2 

Regional 

Option 2 

State 

ERCT 9.9 10.6 10.8 10.4 10.5 7.4% 9.9% 5.3% 6.0% 

FRCC 10.6 11.3 11.6 11.2 11.4 6.5% 8.7% 5.2% 7.1% 

MROE 10.4 10.9 11.0 10.8 10.9 4.7% 5.8% 3.4% 4.2% 

MROW 9.2 9.8 9.8 9.6 9.6 6.4% 7.0% 4.6% 4.9% 

NEWE 13.8 15.2 15.4 14.5 14.8 10.1% 11.4% 5.1% 6.9% 

NYCW 18.0 19.7 19.8 18.8 18.9 9.5% 10.0% 4.6% 5.0% 

NYLI 14.7 16.1 16.1 15.3 15.3 9.3% 9.5% 3.7% 4.2% 

NYUP 12.7 14.0 14.0 13.4 13.3 9.9% 9.8% 4.8% 4.5% 

RFCE 12.2 13.3 13.2 12.6 12.8 8.6% 7.7% 3.2% 4.6% 

RFCM 10.7 11.2 11.3 11.1 11.1 5.1% 6.0% 3.6% 3.9% 

RFCW 10.1 10.7 10.8 10.4 10.3 6.1% 6.3% 2.5% 2.2% 

SRDA 9.0 9.4 9.4 9.3 9.2 4.1% 4.5% 3.0% 2.8% 

SRGW 9.3 9.7 9.7 9.5 9.5 4.9% 4.7% 2.1% 1.7% 

SRSE 10.4 10.7 10.7 10.6 10.6 2.8% 3.4% 2.2% 2.2% 

SRCE 8.2 8.4 8.4 8.3 8.4 1.5% 1.7% 1.3% 1.6% 

SRVC 10.7 10.9 10.9 10.8 10.8 2.4% 2.2% 1.6% 1.5% 

SPNO 10.6 11.7 10.7 11.4 10.7 9.9% 0.6% 7.5% 1.1% 

SPSO 8.3 9.0 9.3 8.8 9.0 8.3% 11.7% 5.3% 7.7% 

AZNM 10.5 11.1 11.3 10.9 11.1 5.3% 7.4% 3.9% 5.6% 

CAMX 14.3 15.2 15.2 14.9 14.9 6.3% 6.4% 4.7% 4.5% 

NWPP 7.3 7.7 7.8 7.6 7.6 6.1% 6.7% 4.5% 4.5% 

RMPA 8.9 9.5 9.9 9.4 9.6 6.3% 10.4% 5.0% 6.9% 

Contiguous 

U.S. 

10.4 11.1 11.1 10.8 10.9 5.9% 6.5% 3.6% 4.0% 

Table 3-22. 2025 Projected Contiguous U.S. and Regional Retail Electricity Prices 

(cents/kWh) 

 2025 Projected Retail Price (cents/kWh) Percent Change from Base Case 

 

Base 

Case 

Option 1 

Regional 

Option 1 

State 

Option 2 

Regional 

Option 2 

State 

Option 1 

Regional 

Option 1 

State 

Option 2 

Regional 

Option 2 

State 

ERCT 11.2 11.5 11.4 11.6 11.6 2.9% 1.8% 3.3% 3.7% 

FRCC 10.9 11.4 11.5 11.3 11.5 4.5% 5.4% 4.1% 5.4% 

MROE 10.5 10.9 11.0 10.8 10.9 4.0% 4.2% 2.5% 4.0% 

MROW 9.2 9.8 9.8 9.6 9.6 5.8% 5.7% 4.3% 4.4% 

NEWE 14.2 14.4 14.5 14.3 14.5 1.4% 1.9% 0.2% 1.6% 

NYCW 18.8 19.1 19.1 18.9 18.9 1.5% 1.3% 0.5% 0.4% 

NYLI 15.6 15.5 15.4 15.4 15.3 -0.4% -1.4% -1.4% -1.5% 

NYUP 13.2 13.3 13.2 13.2 13.1 0.2% -0.4% -0.3% -0.8% 

RFCE 12.6 12.7 12.9 13.0 13.0 0.4% 2.2% 3.0% 3.1% 
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RFCM 10.7 11.2 11.2 11.1 11.1 4.0% 4.5% 3.1% 3.6% 

RFCW 10.9 10.9 11.0 10.9 11.0 -0.4% 0.0% -0.1% 0.3% 

SRDA 9.3 9.7 9.7 9.7 9.7 4.1% 3.7% 3.9% 3.6% 

SRGW 10.1 10.1 10.1 10.1 10.1 -0.1% -0.1% -0.1% -0.1% 

SRSE 10.3 10.7 10.7 10.6 10.7 3.5% 3.8% 2.8% 2.9% 

SRCE 8.2 8.5 8.5 8.4 8.4 3.1% 3.2% 2.2% 2.2% 

SRVC 10.6 10.9 10.8 10.8 10.8 3.0% 2.5% 2.4% 2.0% 

SPNO 10.3 11.8 10.8 11.3 10.7 14.1% 4.5% 8.7% 3.0% 

SPSO 8.8 9.5 9.7 9.4 9.5 7.4% 9.4% 6.0% 7.7% 

AZNM 10.8 11.2 11.3 11.0 11.2 3.9% 5.0% 2.4% 4.0% 

CAMX 13.9 14.4 14.3 14.3 14.3 3.2% 2.9% 2.9% 2.9% 

NWPP 7.4 7.8 7.7 7.6 7.6 5.0% 4.6% 3.4% 3.3% 

RMPA 9.4 9.6 10.0 9.6 9.8 2.3% 6.4% 2.7% 4.8% 

Contiguous 

U.S. 

10.8 11.1 11.1 11.0 11.1 2.7% 2.9% 2.4% 2.7% 

Table 3-23. 2030 Projected Contiguous U.S. and Regional Retail Electricity Prices 

(cents/kWh) 

 2030 Projected Retail Price (cents/kWh) Percent Change from Base Case 

 

Base 

Case 

Option 1 

Regional 

Option 1 

State 

Option 2 

Regional 

Option 2 

State 

Option 1 

Regional 

Option 1 

State 

Option 2 

Regional 

Option 2 

State 

ERCT 11.6 12.0 12.0 11.8 11.8 3.6% 3.9% 1.9% 2.2% 

FRCC 10.9 11.5 11.5 11.1 11.2 4.7% 5.6% 1.5% 2.7% 

MROE 10.5 10.9 11.1 10.7 10.8 4.0% 5.9% 1.7% 3.3% 

MROW 9.4 9.8 9.8 9.6 9.7 4.3% 4.3% 2.6% 3.2% 

NEWE 15.1 15.1 15.3 14.9 15.1 -0.1% 1.0% -1.4% -0.6% 

NYCW 19.9 20.1 20.1 20.0 19.9 1.0% 0.8% 0.4% -0.4% 

NYLI 16.9 16.5 16.3 16.5 16.3 -2.3% -3.3% -2.5% -3.5% 

NYUP 14.2 14.2 14.2 14.2 14.0 0.0% -0.4% -0.3% -1.8% 

RFCE 12.4 12.8 12.9 12.6 12.7 3.4% 4.2% 1.4% 1.9% 

RFCM 10.8 11.2 11.2 11.0 11.0 3.8% 4.5% 2.0% 2.2% 

RFCW 11.2 11.3 11.3 11.2 11.2 0.4% 0.6% -0.1% 0.2% 

SRDA 9.5 9.9 9.9 9.7 9.7 4.6% 4.5% 2.2% 1.8% 

SRGW 10.4 10.3 10.2 10.3 10.4 -1.2% -1.6% -0.9% -0.5% 

SRSE 10.4 10.7 10.8 10.5 10.5 3.2% 4.0% 1.0% 1.5% 

SRCE 8.1 8.4 8.4 8.2 8.2 2.6% 2.7% 1.0% 0.7% 

SRVC 10.4 10.7 10.6 10.5 10.5 3.0% 2.5% 1.3% 0.9% 

SPNO 10.2 11.5 10.5 10.9 10.3 12.7% 3.1% 6.8% 1.2% 

SPSO 9.1 9.7 9.9 9.4 9.6 7.2% 9.2% 3.7% 5.6% 

AZNM 11.5 11.4 11.7 11.3 11.6 -0.2% 2.1% -1.0% 1.0% 

CAMX 14.1 14.7 14.7 14.4 14.4 4.2% 3.9% 2.1% 2.2% 

NWPP 7.4 7.7 7.7 7.6 7.5 2.8% 2.8% 1.5% 1.4% 

Deleted: ¶ ... [1]
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RMPA 9.9 9.9 10.3 9.9 10.0 0.7% 4.7% 0.5% 1.8% 

Contiguous 

U.S. 

10.9 11.2 11.3 11.1 11.1 2.7% 3.1% 1.1% 1.4% 

Figure 3-8. Electricity Market Module Regions 

Source: EIA <http://www.eia.gov/forecasts/aeo/pdf/nerc_map.pdf>. 

3.7.10 Projected Electricity Bill Impacts 

The electricity price changes addressed in section 3.7.9 combine with the significant 

reductions in electricity demand applied in the illustrative scenarios to affect average electricity 

bills. The estimated changes to average bills are summarized in Table 3-24. Under 

Option 1, EPA estimates an average bill increase of 2.7% to 3.2% in 2020 and an average bill 

decrease of 8.4% to 8.7% in 2030. Under Option 2, EPA estimates an average bill increase of 

1.1% to 1.4% in 2020 and an average bill decrease of 6.6% to 6,8% in 2030. These reduced 

electricity bills reflect the combined effects of changes in both average retail rates (driven by the 

effects of all four building blocks) and lower electricity demand (driven by the fourth building 

block, demand-side energy efficiency). 

 Table 3-24. Projected Changes in Average Electricity Bills 

 2020 2025 2030 

Option 1 Regional 2.7% -5.4% -8.7% 

Option 1 State 3.2% -5.3% -8.4% 

Option 2 Regional 1.1% -3.5% -6.8% 

Option 2 State 1.4% -3.2% -6.6% 

Deleted: policy-induced 
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3-12 

3.8 Projected Primary PM Emissions from Power Plants 

IPM is not configured to endogenously model primary PM emissions from power plants. 

These emissions are calculated as a function of IPM outputs, emission factors and control 

configuration. IPM-projected fuel use (heat input) is multiplied by PM emission factors (based in 

part on the presence of PM-relevant pollution control devices) to determine PM emissions. 

Primary PM emissions are calculated by adding the filterable PM and condensable PM 

emissions. 

Filterable PM emissions for each unit are based on historical information regarding 

existing emissions controls and types of fuel burned and ash content of the fuel burned, as well 

as the projected emission controls (e.g., scrubbers and fabric filters). 

Condensable PM emissions are based on plant type, sulfur content of the fuel, and 

SO2/HCl and PM control configurations. Although EPA’s analysis is based on the best available 

emission factors, these emission factors do not account for the potential changes in condensable 

PM emissions due to the installation and operation of SCRs. The formation of additional 

condensable PM (in the form of SO3 and H2SO4) in units with SCRs depends on a number of 

factors, including coal sulfur content, combustion conditions and characteristics of the catalyst 

used in the SCR, and is likely to vary widely from unit to unit. SCRs are generally designed and 

operated to minimize increases in condensable PM. This limitation means that IPM postprocessing is potentially underestimating condensable PM emissions for units with SCRs. In 

contrast, it is possible that IPM post-processing overestimates condensable PM emissions in a 

case where the unit is combusting a low-sulfur coal in the presence of a scrubber. 

EPA applied this methodology to develop primary PM emission projections for 2025 in 

the base case, and for Option 1 State and Option 2 Regional. Using these results, EPA then 

estimated primary PM emissions for the remainder of the base case and policy scenarios over the 

2020-2030 time horizon using simplified emissions factors. These factors were developed for 

the eastern and western regions (excluding California) using EPA’s emissions and fuel use 

projections for fossil plus biomass. Separate factors were developed for base case and policy 

case scenarios. These factors were applied to the projected fuel use from fossil and biomass 

plant types. While this methodology provides a reasonable estimate, EPA notes that applying the 
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3-13 

methodology discussed above would likely yield different results. Nevertheless, EPA has 

determined that this estimation is sufficient for the purpose of estimating benefits on a large 

regional level. 

For a more complete description of the methodologies used to post-process PM emissions 

from IPM, see “IPM ORL File Generation Methodology” (March, 2011), available in the docket. 

3.9 Limitations of Analysis 

EPA’s modeling is based on expert judgment of various input assumptions for variables 

whose outcomes are in fact uncertain. As a general matter, the Agency reviews the best available 

information from engineering studies of air pollution controls, the ability to improve operating 

efficiency, and new capacity construction costs to support a reasonable modeling framework for 

analyzing the cost, emission changes, and other impacts of regulatory actions. 

The costs presented in this RIA include both the IPM-projected annualized estimates of 

private compliance costs as well as the estimated costs incurred by utilities and ratepayers to 

achieve demand-side energy efficiency improvements. The IPM-projected annualized estimates 

of private compliance costs provided in this analysis are meant to show the increase in 

production (generating) costs to the power sector in response to the final rule. To estimate these 

annualized costs, EPA uses a conventional and widely-accepted approach that applies a capital 

recovery factor (CRF) multiplier to capital investments and adds that to the annual incremental 

operating expenses. The CRF is derived from estimates of the cost of capital (private discount 

rate), the amount of insurance coverage required, local property taxes, and the life of capital.56 

The demand-side energy efficiency costs are developed based on a review of energy 

efficiency data and studies, and expert judgment. EPA recognizes that significant variation exists 

in these analyses reflecting data and methodological limitations. The method used for estimating 

the demand-side energy efficiency costs is discussed in more detail in the Greenhouse Gas 

Abatement Measures TSD. The TSD also discusses the economic literature of energy efficiency 

costs and related considerations, energy savings potential studies, and discusses the associated 

 

56 See Chapter 8 of EPA’s Base Case using IPM (v5.13) documentation, available at: 

http://www.epa.gov/powersectormodeling/BaseCasev513.html. 

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uncertainties. The evaluation, measurement and verification (EM&V) of demand-side energy 

efficiency is addressed in the State Plan Considerations TSD. 

The base case electricity demand in IPM v.5.13 is calibrated to reference case demand in 

AEO 2013. AEO 2013 demand reflects, to some degree, a continuation of the impacts of state 

demand-side energy efficiency policies but does not explicitly represent many of the existing 

state policies in this area (e.g., energy efficiency resource standards). To some degree the 

implicit representation of state policies in the EPA’s base case alters the impacts assessment, but 

the direction of change is not known with certainty. This issue is discussed in more detail in the 

Greenhouse Gas Abatement Measures TSD. 

Cost estimates for the proposed rule are based on rigorous power sector modeling using 

ICF’s Integrated Planning Model.57 IPM assumes “perfect foresight” of market conditions over 

the time horizon modeled; to the extent that utilities and/or energy regulators misjudge future 

conditions affecting the economics of pollution control, costs may be understated as well.

Furthermore, IPM does not represent electricity markets in Alaska, Hawaii, and U.S. territories 

outside the contiguous U.S. and therefore the costs (and benefits) that may be expected from the 

proposed rule in this states and territories are not accounted for in the compliance cost modeling. 

3.10 Significant Energy Impacts 

The proposed rule (Option 1) would have a significant impact according to E.O. 13211: 

Actions that Significantly Affect Energy Supply, Distribution, or Use. Under the provisions of 

this rule, EPA projects that approximately 46 to 49 GW of additional coal-fired generation 

(about 19% of all coal-fired capacity and 4.6% of total generation capacity in 2020) may be 

removed from operation by 2020. 

EPA also projects the average delivered coal price decreases by 16.3% to 16.5% with 

decreased production of 208 to 228 million tons (24.6% to 27.7% of US production) in 2020 and 

that electric power sector delivered natural gas prices will increase by about 9.3% to 11.5% with 

increased power sector consumption of between 979 to 1,194 billion cubic feet (BCF) in 2020. 

 

57 Full documentation for IPM can be found at <http:// http://www.epa.gov/powersectormodeling>. 

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Average retail electricity price are projected to increase in the contiguous U.S. by 5.9% to 6.5% 

in 2020. 

3.11 Monitoring, Reporting, and Recordkeeping Costs 

EPA projected monitoring, reporting and recordkeeping costs for both state entities and 

affected EGUs for the compliance years 2020, 2025 and 2030. In calculating the costs for state 

entities, EPA estimated personnel costs to oversee compliance, and review and report annually to 

EPA on program progress relative to meeting the state’s reduction goal. To calculate the national 

costs, EPA estimated that 49 states and 1,228 facilities would be affected. 

In calculating the cost for affected EGUs to comply, EPA assumed that the state plan 

would utilize a rate-based emission limit. The EPA estimated that the majority of the cost to 

EGUs would be in calculating net energy output. Since the majority of EGUs do have some 

energy usage meters or other equipment available to them, EPA believes a new system for 

calculating net energy output is not needed. However, an affected EGU will still need to be 

modify their equipment to comply with a rate-based limit as described in the emission 

guidelines. The EPA estimates that it would take 3 working months for a technician to retrofit 

any existing energy meters to meet the requirements set in the state plan. Additionally EPA 

believes that 1 hour will be needed for each EGU operator to read the rule and understand how 

the facility will comply with the rule. Also, after all modifications are made at a facility to 

measure net energy output, each EGUs Data Acquisition System (DAS) would need to be 

upgraded to supply the rate-based emissions value to either the state or EPA’s Emissions 

Collection and Monitoring Plan System (ECMPS). Please note the costs to develop net energy 

output monitoring and to upgrade each facility’s DAS system are one-time costs incurred in 

2020. Recordkeeping and reporting costs substantially decrease for the period 2021-2030. The 

projected costs for 2020, 2025, and 2030 are summarized below. 

In calculating the cost for states to comply, EPA estimates that each state will rely on the 

equivalent of 2 full time staff to oversee program implementation, assess progress, develop 

possible contingency measures, state plan revisions and the subsequent public meetings if 

revisions are indeed needed, download data from the ECMPS for their annual reporting and 

develop their annual EPA report. Table 3-25 shows the annual respondent burden costs and costs 

of reporting and recordkeeping for 2020, 2025 and 2030.

Deleted: 0

Deleted: 4

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Table 3-25. Years 2020, 2025 and 2030: Summary of Annual Respondent Burden and Cost 

of Reporting and Recordkeeping Requirements (2011$) 

Nationwide 

Totals 

Total Annual 

Labor Burden 

(Hours) 

Total 

Annual 

Labor Costs 

Total 

Annualized

Capital 

Costs 

Total 

Annual 

O&M Costs 

Total Annualized 

Costs 

 Year 

2020 900,048 $65,573,900 $0 $2,701,100 $68,275,000

 Year 

2025 217,280 $8,215,240 $0 $638,500 $8,853,740

 Year 

2030 217,280 $8,215,240 $0 $638,500 $8,853,740 

The annual costs of this proposal Option1 and regulatory alternative Option 2 including 

monitoring reporting and recordkeeping costs are shown in Table 3-26 below. 

Table 3-26. Annualized Compliance Costs Including Monitoring, Reporting and 

Recordkeeping Costs Requirements (billions of 2011$) 

 2020 2025 2030 

Option 1 Regional 5.5 4.6 7.3 

Option 1 State 7.5 5.5 8.8 

Option 2 Regional 4.3 4.5 1.9 

Option 2 State 5.5 5.5 3.1 

Source: Integrated Planning Model run by EPA, 2014 and GHG Abatement Measures 

TSD. Monitoring, reporting and recordkeeping costs calculated outside IPM. 

 3.12 Social Costs 

As discussed in the EPA Guidelines for Preparing Economic Analyses, social costs are 

the total economic burden of a regulatory action. This burden is the sum of all opportunity costs 

incurred due to the regulatory action, where an opportunity cost is the value lost to society of any 

goods and services that will not be produced and consumed as a result of reallocating some 

resources towards pollution mitigation. Estimates of social costs may be compared to the social 

benefits expected as a result of a regulation to assess its net impact on society. The social costs of 

a regulatory action will not necessarily be equivalent to the expenditures associated with 

compliance. Nonetheless, here we use compliance costs as a proxy for social costs. This section 

Formatted Table

Deleted: 852,160

Deleted: $61,583,900

Deleted: $0 

Deleted: $2,701,100

Deleted: $64,285,000 

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provides a qualitative discussion of the relationship between social costs and compliance cost 

estimates presented in this chapter. 

For the illustrative compliance scenarios cost estimates presented in this Chapter are the 

sum of expenditures on end-use energy efficiency programs and the change in expenditures 

required by the electricity sector to comply with the proposed guidelines. These two components 

are estimated separately. The expenditures required to achieve the assumed demand reductions 

through end-use energy efficiency programs are estimated using historical data and expert 

judgment. The change in the expenditures required by the electricity sector to meet demand and 

maintain compliance are estimated by IPM and reflect both the reduction in electricity 

production costs due to the reduction in demand caused by the end-use energy efficiency 

programs and the increase in electricity production costs required to achieve the additional 

emission reductions necessary to comply with the state goals.58 

As described in section 3.6.1, the illustrative scenarios generally assume that, in 

achieving their goals, states adopt energy efficiency programs which lead to net demand 

reductions in each year equivalent to those applied in the calculation of their respective goals. 

The estimated expenditures required to achieve those net demand reductions through end-use 

energy efficiency programs are presented in this chapter and detailed in the GHG Abatement 

Measures TSD chapter on end-use energy efficiency. The social cost of achieving these energy 

savings comes in the form of increased expenditures on technologies and/or services that are 

required to lower end-user’s electricity consumption beyond the business as usual. Under the 

assumption of complete and well-functioning markets the expenditures required to reduce 

electricity consumption on the margin will represent society’s opportunity cost of the resources 

required to produce the energy savings. 

The social cost of achieving these net electricity demand reductions may differ from the 

expenditures associated with the end-use energy efficiency programs. For example, some 

participants in end-use energy efficiency programs might have chosen to adopt the energy 

efficiency improvements even in the absence of the program.59 Therefore the expenditures, 

 

58 As described in section 3.5, IPM provides the least-cost solution to attaining the constraints representing the 

regulation required used to achieve the state goals but for the component of the state goals that is achieved by 

end use energy efficiency programs. 

59 For example if a rebate program is offered for energy efficient appliances, some participants that claim the rebate 

may have purchased the more energy efficient appliances even without the rebate and so the rebate and 

Formatted: Indent: First line: 0.5"
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except for any program administration expenditures, associated with those demand reductions 

are not part of the program’s social costs, as they would have accrued even in its absence.60 The 

compliance cost estimates for the illustrative scenarios includes this limited share of the program 

costs that is expended on end-users who would have reduced their demand in the absence of the 

program. Thus, with respect to this particular issue, the social cost of the illustrative scenarios 

would be less than the estimated compliance cost reported in Table 3-9 to a limited degree. If the 

program expenditures that do not lead to additional demand reductions are paid for by electricity 

rate or tax payer funded programs then that portion of program expenditures represents a transfer 

among electricity consumers and has no net welfare gain or loss to society as a whole. 

Due to the flexibility held by states in implementing their compliance with the proposed 

standards these energy efficiency expenditures may be borne by end-users through direct 

participant expenditures or electricity rate increases or by producers through reductions in their 

profits. While the allocation of these expenditures between consumers and producers is 

important for understanding the distributional impact of potential compliance strategies, it does 

not necessarily affect the opportunity cost required for the production of the energy savings from 

a social perspective. However, specific design elements of demand-side or end-use energy 

efficiency programs included to address distributional outcomes may have an effect on the 

economic efficiency of the programs and therefore the social cost. 

Another reason the expenditures associated with end-use energy efficiency programs may 

differ from social costs is due to differences in the services provided by more energy efficient 

technologies and services adopted under the program relative to the baseline. For example, if 

under the program end-users adopted more energy efficient products which were associated with 

quality or service attributes deemed less desirable, then there would be an additional welfare loss 

that should be accounted for in social costs but is not necessarily captured in the measure of 

expenditures. However, there is an analogous (and more common) possibility that in some cases 

the quality of services, outside of the energy savings, provided by the more energy efficient 

products and practices are deemed more desirable by some end-users. For example, 

weatherization of buildings to reduced electricity demand associated with cooling will likely 

 investment made by these end-users is not a social cost of the program. However, the administrative cost of the 

rebate program is a social cost as it requires the reallocation of societal resources. 

60 The demand reductions assumed in the illustrative compliance scenarios only include those additional demand 

reductions motivated by the program costs. That is, the demand reductions assumed for the illustrative 

compliance scenarios already account for the potential that some program costs do not lead to additional energy 

efficiency investments by end-users. For more information see the GHG Abatement Measures TSD chapter on 

end-use energy efficiency. 
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have a significant impact on natural gas use associated with heating. In either case these real 

welfare impacts are not fully captured by end-use energy efficiency expenditure estimates. 

The fact that such quality and service differences may exist in reality but may not be 

reflected in the price difference between more and less energy efficient products is one potential 

hypothesis for the energy paradox. The energy paradox is the observation that end-users do not 

always purchase products that are more energy efficient when the additional cost is less than the 

reduction in the net present value of expected electricity expenditures achieved by those 

products.61 Such circumstances are present in the analysis presented in this chapter, whereby in 

some regions the base case and illustrative scenarios suggest that cost of reducing demand 

through energy efficiency programs is less than the retail electricity price. In addition to 

heterogeneity in product services and consumer preferences, there are other explanations for the 

energy paradox, falling both within and outside the neoclassical rational expectations paradigm 

that is used in benefit/cost analysis. The end-use energy efficiency chapter of the GHG 

Abatement Measures TSD discusses the energy paradox in detail and provides additional 

hypothesis for why consumers may not make energy efficiency investments that ostensibly seem 

to be in their own interest. The TSD discussion also provides details on how the presence of 

additional market failures can lead to levels of energy efficiency investment that may be too low 

from society’s perspective even if that is not the case for the end-user. In such cases there is the 

potential for properly designed energy efficiency programs to address the source of underinvestment, such as principal-agent problems where there is a disconnect between those making 

the purchase decision regarding energy efficient investments and energy use and those that 

would receive the benefits associated with reduced energy use through lower electricity bills. 

The other component of compliance cost reported in this chapter is the change in resource 

cost (i.e., expenditures) required by the electricity sector to fulfill the remaining demand while 

making additional CO2 emissions intensity reductions necessary to comply with the state goals. 

Included in the estimate of these compliance costs, developed using IPM, are the cost savings 

associated with the reduction in required electricity generation due to the demand reductions 

from end-use energy efficiency programs and improvements in heat rate. By shifting the demand 

 

61 An analogous situation is present when some EGUs have assumed to have the ability to make heat rate 

improvements at a capital cost that is less than the anticipated fuel expenditure savings. 

Deleted: baseline 

Formatted: Subscript
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curve for electricity, energy efficiency programs reduce the production cost in the sector. The 

resource cost estimates from IPM therefore account for the increased cost of providing electricity 

at a lower average emissions rate net of the reduction in production costs due to lower demand 

from end-use energy efficiency programs. 

Under the assumption that impacts outside the electricity market and markets providing 

inputs to the electricity sector do not meaningfully affect the prices in those markets, and the 

assumption of fixed electricity demand, then the social costs associated with the regulatory 

action would be equal to the resource costs measured by IPM (net of tax and subsidy payments 

and recovery of sunk costs). Under these assumptions the change in compliance cost will equal 

the reduction in producer62 and consumer surplus63 in the electricity sector from the preregulatory action market equilibrium. However, IPM forecasts production and price changes in 

fuel markets, which implies that there are changes in producer and consumer surplus in those 

markets, and therefore the resource cost estimate by IPM may differ from the social cost for this 

reason. For a theoretically consistent method for estimating partial-equilibrium changes in 

welfare where prices and outputs change in multiple markets see Chapter 9 of Just et al. (2004). 

3.13 References 

US EPA (2010) EPA Guidelines for Preparing Economic Analyses, Chapters 8 and Appendix A. 

http://yosemite.epa.gov/ee/epa/eed.nsf/webpages/guidelines.html

 

62 Producer surplus is a welfare measure representing the amount gained by producers from selling output at a 

market price higher than the price they are willing to accept. 

63 Consumer surplus is a welfare measure representing the monetized value of the benefit consumers receive from 

consumption of purchased goods or services beyond their opportunity cost as defined by the market price. 

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APPENDIX 3A: ANALYSIS OF POTENTIAL UPSTREAM METHANE EMISSIONS 

CHANGES IN NATURAL GAS SYSTEMS AND COAL MINING

The purpose of this appendix is to describe the methodology for estimating upstream 

methane (CH4) emissions related to natural gas systems and coal mining sectors that may result 

from the compliance approaches examined in the Regulatory Impact Analysis (RIA). The US 

Environmental Protection Agency (EPA) assessed whether the net change in upstream methane 

emissions from natural gas and coal production is likely to be positive or negative and also 

assessed the potential magnitude of these upstream changes relative to CO2 emissions reductions 

anticipated at power plants from the compliance strategies examined in the RIA. In addition to 

estimating changes in upstream methane emissions, this assessment included estimating CO2

from the flaring of methane, but did not examine other potential changes in other upstream 

greenhouse gas emissions changes from natural gas systems and coal mining sectors. 

The methodologies used to project upstream emissions were previously developed for the 

purpose of the Sixth U.S. Climate Action Report, and were subject to peer review and public 

review as part of the publication of that report. In Section 3A.1, the overall approach is described 

in brief. In Section 3A.2, results are presented. In Section 3A.3, detailed methodologies are 

presented for how CH4 and CO2 projections were calculated for coal mining and natural gas 

systems. Finally, Section 3A.4 contains a bibliography of cited resources. 

3A.1 General Approach

3A.1.1 Analytical Scope 

Upstream CH4 and CO2 emissions associated with coal mining and natural gas systems 

were estimated for 2020 through 2030 using methodologies developed for the 2014 U.S. Climate 

Action Report (U.S. Department of State 2014). The base year for the projections is 2011, as 

reported in the 2013 U.S. GHG Inventory (EPA 2013a). The projection methodologies use 

activity driver data outputs such as coal and natural gas production from the baseline and policy 

scenarios generated by the Integrated Planning Model (IPM), which was used in the RIA to 

model compliance strategies. The projection methodologies use similar activity data and 

emissions factors as are used in the U.S. Greenhouse Gas (GHG) Inventory. The projection 
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3-2 

methodologies estimate reductions associated with both voluntary and regulatory programs 

affecting upstream emissions. In the case of the voluntary programs, the rate of reductions is 

based on the historical average over recent years. In the case of regulatory reductions, the 

reductions are based on the reduction rates estimated in the relevant regulatory impact analysis. 

The methodologies were subject to expert peer review and public review in the context of the 

Sixth U.S. Climate Action Report. For more information on the review, or for the detailed 

methodologies used for non-CO2 source projections in that report, see “Methodologies for U.S. 

Greenhouse Gas Emissions Projections: Non-CO2 and Non-Energy CO2 Sources” (EPA, 2013b). 

Uncertainties and limitations are discussed, including a side case which incorporates additional 

geographic information for estimating CH4 from coal mining. 

The term “upstream emissions” in this memo refers to vented, fugitive and flared 

emissions associated with fuel production, processing, transmission, storage, and distribution of 

fuels prior to fuel combustion in electricity plants. For this analysis, the EPA focused on 

upstream CH4 from the natural gas systems and coal mining sectors. In addition, the analysis 

included CO2 resulting from flaring in natural gas production. This analysis does not assess other 

upstream GHG emissions changes, such as CO2 emissions from the combustion of fuel used in 

natural gas and coal production activities or other non-combustion CO2 emissions from natural 

gas systems, such as vented CO2 and CO2 emitted from acid-gas removal processes. 

Also, the EPA assessed potential upstream methane emissions from natural gas systems 

and coal mining sectors within the domestic US, but did not examine emissions from potential 

changes in upstream emissions generated by changes in natural gas and coal production, 

processing, and transportation activities outside of the US.64. Last, the EPA did not assess 

potential changes in other upstream non-GHG emissions, such as nitrogen oxides, volatile 

organic compounds, and particulate matter. Table 3A-1 presents estimates of the upstream 

emissions discussed in this memo for 2011, based on the 2013 U.S. GHG Inventory. 

EPA defined the boundaries of this assessment in order to provide targeted insights into the 

potential net change in methane emissions from natural gas systems and coal production 

 

64 While the analysis does not estimate methane emissions changes outside of the United States, activity factors 

include imports and exports of natural gas to help estimate domestic methane emissions related to trade of 

natural gas, such as emissions from LNG terminals in the US or from pipelines transporting imported natural gas 

within the US (or transporting natural gas within the US while en route for export). 
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3-3 

activities specifically. CO2 emissions from flared methane are included because regulatory and 

voluntary programs influence the rate of methane flaring over time and the CO2 remaining after 

flaring is a methane-related GHG. Because of the multiple compliance strategies adopted in the 

illustrative compliance scenarios, a more comprehensive assessment of upstream GHG emissions 

would require examination of the broader power sector and related input markets and their 

potential changes in response to the rule. This analysis would be complex and likely subject to 

data limitations and substantial uncertainties. Rather, EPA chose to limit the scope of this 

upstream analysis to evaluate the potential for changes in GHG emissions that may be of 

significant scale relative to the impacts of the rule and for which EPA had previously-reviewed 

projection techniques, which are presented in detail below.

3A.1.2 Coal Mining Source Description 

Within coal mining, this analysis covers fugitive CH4 emissions from coal mining 

(including pre-mining drainage) and post-mining activities (i.e., coal handling), including both 

underground and surface mining. Emissions from abandoned mines are not included. Energyrelated CO2 emissions, such as emissions from mining equipment and vehicles transporting coal 

are not included. CH4, which is contained within coal seams and the surrounding rock strata, is 

released into the atmosphere when mining operations reduce the pressure above and/or 

surrounding the coal bed. The quantity of CH4 emitted from these operations is a function of two 

primary factors: coal rank and coal depth. Coal rank is a measure of the carbon content of the 

coal, with higher coal ranks corresponding to higher carbon content and generally higher CH4

content. Pressure increases with depth and prevents CH4 from migrating to the surface; as a 

result, underground mining operations typically emit more CH4 than surface mining. In addition 

to emissions from underground and surface mines, post-mining processing of coal and 

abandoned mines also release CH4. Post-mining emissions refer to CH4 retained in the coal that 

is released during processing, storage, and transport of the coal. 

3A.1.3 Natural Gas Systems Source Description 

Within natural gas systems, this analysis covers vented and fugitive CH4 emissions from 

the production, processing, transmission and storage, and distribution segments of the natural gas 

system. It also includes CO2 from flaring of natural gas. Not included are vented and fugitive 

Deleted: 

Comment [A51]: 

Reviewer comment: 

This states that EPA "chose to limit the scope" of 

their analysis, but the text does not clearly justify 

this decision. We would like to understand why the 

choice was made to focus on one GHG (methane) 

and not another (CO2). 

Another sentence refers to methane emissions from 

natural gas systems and coal production as an 

"important" and "well defined issue." However, 

since roughly half of all upstream GHGs from 

natural gas systems are energy-related CO2 (and the 

other half are methane), it may appear to be a little 

arbitrary to refer to the upstream methane issue as 

"important" when justifying a narrowed scope which 

excludes energy-related CO2. In other words, EPA 

should explain what makes methane more important 

than CO2 in this context when their total (GWPweighted) GHG impacts are comparable. In addition, 

characterizing methane emissions from natural gas 

systems as a "well-defined issue” may not be 

universally agreed upon. DOE would suggest a 

different word choice, given the amount of active 

debate and controversy over the scale of methane 

emissions from natural gas systems. 

Comment [A52]: Response to reviewer 

comment: 

We modified the paragraph to address the reviewer’s 

comments. 
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CO2 emissions from natural gas systems, such as vented CO2 emissions removed during natural 

gas processing, or energy-related CO2 such as emissions from stationary or mobile combustion. 

The U.S. natural gas system encompasses hundreds of thousands of wells, hundreds of 

processing facilities, and over a million miles of transmission and distribution pipelines. CH4 and 

non-combustion65 CO2 emissions from natural gas systems are generally process-related, with 

normal operations, routine maintenance, and system upsets being the primary contributors. There 

are four primary stages of the natural gas system which are briefly described below. 

Production: In this initial stage, wells are used to withdraw raw gas from underground 

formations. Emissions arise from the wells themselves, gathering pipelines, and well-site gas 

treatment facilities (e.g., dehydrators, separators). Major emissions source categories within the 

production stage include pneumatic devices, gas wells with liquids unloading, and gas well 

completions and re-completions (i.e., workovers) with hydraulic fracturing (EPA 2013). Flaring 

emissions account for the majority of the non-combustion CO2 emissions within the production 

stage. 

Processing: In this stage, natural gas liquids and various other constituents from the raw gas are 

removed, resulting in “pipeline-quality” gas, which is then injected into the transmission system. 

Fugitive CH4 emissions from compressors, including compressor seals, are the primary 

emissions source from this stage. In the U.S. GHG Inventory, the majority of non-combustion 

CO2 emissions in the processing stage come from acid gas removal units, which are designed to 

remove CO2 from natural gas. 

Transmission and Storage: Natural gas transmission involves high-pressure, large-diameter 

pipelines that transport gas long distances from field production and processing areas to 

distribution systems or large-volume customers such as power plants or chemical plants. 

Compressor station facilities, which contain large reciprocating and turbine compressors, are 

used to move the gas throughout the U.S. transmission system. Fugitive CH4 emissions from 

these compressor stations and from metering and regulating stations account for the majority of 

the emissions from this stage. Pneumatic devices and non-combusted engine exhaust are also 

sources of CH4 emissions from transmission facilities. Natural gas is also injected and stored in 

underground formations, or liquefied and stored in above-ground tanks, during periods of lower 

demand (e.g., summer), and withdrawn, processed, and distributed during periods of higher 

demand (e.g., winter). Compressors and dehydrators are the primary contributors to emissions 

from these storage facilities. Emissions from LNG import terminals are included within the 

transportation and storage stage. 

Distribution: Distribution pipelines take the high-pressure gas from the transmission system at 

“city gate” stations, reduce the pressure, and then distribute the gas through primarily 

underground mains and service lines to individual end users. 

 

65 In this document, consistent with IPCC accounting terminology, the term “combustion emissions” refers to the 

emissions associated with the combustion of fuel for useful heat and work, while “non-combustion emissions” 

refers to emissions resulting from other activities, including flaring and CO2 removed from raw natural gas. 
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Table 3A-1. Base Year Upstream Emissions in the U.S. GHG Inventory 

Emissions Source 2011 Emissions 

(TgCO2e) 

CH4 from Coal Mining 75.2 

Underground Mining and Post- 

 Mining 57.4 

Surface Mining and Post-Mining 18.0 

CH4 from Natural Gas Systems 172.3 

Production 63.6 

Processing 23.3 

Transmission and Storage 52.1 

Distribution 33.2 

CO2 from flaring of natural gas 10.3 

 Source: 2013 U.S. GHG Inventory (EPA, 2013) 

It is important to note that in Table 3A-1, CO2-equivalent methane emissions are presented 

using the Fourth Assessment Report Global Warming Potential (GWP) of 25, whereas CO2-

equivalent methane emissions in the 1990-2011 U.S. GHG Inventory (EPA 2013) are presented 

using the Second Assessment Report GWP of 21. EPA plans to use 25 as the methane GWP 

starting with the 1990-2013 U.S. GHG Inventory, to be published in April 2015. 

3A.1.4 Compliance Approaches Examined 

As is described in the RIA for the proposed EGU GHG Existing Source Emissions 

Guidelines, the EPA is using the following four building blocks to determine state-specific goal 

for the proposed EGU GHG Existing Source Emissions Guidelines: 

1. Lowering the carbon intensity of generation at individual affected EGUs (e.g., through 

heat rate improvements) 

2. Reducing emissions of the most carbon-intensive affected EGUs to the extent that this 

can be accomplished cost-effectively by shifting generation to less carbon-intensive 

existing fossil fuel-fired EGUs, including NGCC units that are under construction 

3. Reducing emissions of carbon-emitting EGUs to the extent that this can be 

accomplished cost-effectively by expanding the amount of new, lower (or no) carbonintensity generation 
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4. Reducing emissions of carbon-emitting EGUs to the extent that this can be 

accomplished cost-effectively by increasing demand-side energy efficiency 

States will ultimately determine optimal approaches to comply with the goals established 

in this regulatory action. Each of these goal approaches use the four building blocks described 

above at different levels of stringency. Option 1 involves higher deployment of the four building 

blocks but allows a longer timeframe to comply (2030) whereas Option 2 has a lower 

deployment over a shorter timeframe (2025). The RIA depicts illustrative state’s compliance 

scenarios for the goals set for Options 1 and 2, inclusive of regional and state compliance 

approaches for each option. 

3A.1.5 Activity Drivers 

IPM-based activity driver projections from baseline and policy scenarios underlie the 

estimates of upstream methane emissions. These activity drivers include domestic coal and 

natural gas production, imports and exports, and natural gas consumption. For a sensitivity 

analysis described later, regional coal production is used for the Appalachian, Interior, and 

Western regions. The following Tables 3A-2 to 3A-5 summarize the IPM-based activity driver 

results from the baseline, Option 1 Regional and State scenarios, and Option 2 Regional and 

State scenarios.66

Under Option 1, the state and regional compliance scenarios result in 24 percent and 22 

percent reductions in coal production in 2020, respectively, relative to base case coal production. 

Natural gas production in 2020 increases by 4 percent as a result of the Option 1 State 

compliance scenario, and increases by 3 percent in the Option 1 Regional compliance scenario 

relative to the base case. 

Under Option 2, the state and regional compliance scenarios result in 19 percent and 17 

percent reductions in coal production in 2020, respectively, relative to base case coal production. 

Natural gas production in 2020 increases by 3 percent as a result of either the Option 2 state 

compliance scenario or the Option 2 Regional compliance scenario, relative to the base case. 

 

66 Uncertainties related to activity drivers are discussed in the uncertainties and limitations section. 
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Table 3A-2. Projected Coal Production Impacts, Option 1 

 

Coal Production 

(million short tons) 

Coal Production 

Change from Base 

Case 

(million short tons) 

Coal Production 

Percent Change 

from Base Case 

 2020 2025 2030 2020 2025 2030 2020 2025 2030 

Base 

Case 921 952 951 

Option 1 

State 695 682 682 -225 -270 -269 -24% -28% -28% 

Option 1 

Regional 716 698 702 -205 -254 -249 -22% -27% -26% 

Table 3A-3. Projected Coal Production Impacts, Option 2 

 

Coal Production 

(million short tons) 

Coal Production 

Change from Base 

Case 

(million short tons) 

Coal Production 

Percent Change 

from Base Case 

 2020 2025 2030 2020 2025 2030 2020 2025 2030 

Base 

Case 921 952 951 

Option 2 

State 747 749 772 -174 -203 -178 -19% -21% -19% 

Option 2 

Regional 763 764 795 -157 -187 -156 -17% -20% -16% 

Table 3A-4. Projected Natural Gas Production Impacts, Option 1 

 

Dry Gas 

Production 

(trillion cubic feet) 

Dry Gas 

Production Change 

from Base Case 

(trillion cubic feet) 

Dry Gas 

Production Percent 

Change from Base 

Case 

 2020 2025 2030 2020 2025 2030 2020 2025 2030 

Base 

Case 26.6 29.3 31.9 

Option 1 

State 27.7 29.8 31.7 +1.1 +0.6 -0.2 +4% +2% -1% 

Option 1 

Regional 27.5 29.7 31.5 +0.9 +0.4 -0.4 +3% +1% -1% 
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Table 3A-5. Projected Natural Gas Production Impacts, Option 2 

 

Dry Gas 

Production 

(trillion cubic feet) 

Dry Gas 

Production Change 

from Base Case 

(trillion cubic feet) 

Dry Gas 

Production Percent 

Change from Base 

Case 

 2020 2025 2030 2020 2025 2030 2020 2025 2030 

Base 

Case 26.6 29.3 31.9 

Option 2 

State 27.5 29.8 31.6 +0.9 +0.5 -0.3 +3% +2% -1% 

Option 2 

Regional 27.4 29.7 31.4 +0.8 +0.4 -0.5 +3% +1% -1% 

3A.2 Results 

This section presents results for the main analysis and sensitivity analysis. The detailed methods 

used to perform the analysis are presented in section 3A.3. 

3A.2.1 Primary Results 

 Both options 1 and 2, in either the state or regional compliance scenarios, result in total 

net reductions in upstream CH4 emissions and CO2 emissions (see Table 3A-6). Under Option 1, 

the state compliance scenario results in net emissions reduction of 10.6 TgCO2e in 2020, while 

the regional compliance scenario results in 9.9 TgCO2e reduction. Under Option 2, the net 

emissions reduction is smaller: 7.7 and 7.4 TgCO2e in the state and regional compliance 

scenarios in 2020, respectively. These net emissions changes represent the sum of changes in 

CH4 from coal mining, CH4 from natural gas systems, and CO2 from flaring in natural gas 

production. 

 Under the regional compliance scenario, Option 1 would result in decreases in CH4

emissions from coal mining of 14.7 TgCO2e in 2020, 18.2 TgCO2e in 2025, and 17.7 TgCO2e in 

2030. Under the same scenario, CH4 from natural gas systems increases relative to the base case 

in 2020 (4.4 TgCO2e) and 2025 (2.1 TgCO2e) but decreases relative to the base case in 2030 (by 

1.7 TgCO2e). Following a similar pattern, CO2 from flaring in natural gas production increases 

by 0.4 TgCO2e in 2020 and 0.3 TgCO2e in 2025 while decreasing by 0.3 TgCO2e in 2030. The 

total net change under the Option 1 Regional compliance scenario is a reduction in emissions. 
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 Under the regional compliance scenario, Option 2 would result in decreases in CH4

emissions from coal mining of 11.3 TgCO2e in 2020, 13.4 TgCO2e in 2025, and 11.1 TgCO2e in 

2030. CH4 from natural gas systems increases relative to the base case in 2020 (3.6 TgCO2e) and 

2025 (1.8 TgCO2e), while decreasing in 2030 (by 2.3 TgCO2e). CO2 from flaring in natural gas 

production increases in 2020 and 2025, and decreases in 2030. Like Option 1, the total net 

change under the Option 2 Regional compliance scenario is a reduction in emissions. The full 

results are listed in Table 3A-6. 
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Table 3A-6. Upstream Emissions Changes, Baseline to Compliance Scenarios 

 Emissions (TgCO2e) 

 2020 2025 2030 

Option 1 State 

CH4 from Coal Mining -16.1 -19.3 -19.1 

CH4 from Natural Gas Systems +5.1 +2.6 -1.0 

CO2 from NG flaring +0.4 +0.2 -0.3 

Total CH4 + CO2 -10.6 -16.4 -20.5 

Option 1 Regional 

CH4 from Coal Mining -14.7 -18.2 -17.7 

CH4 from Natural Gas Systems +4.4 +2.1 -1.7 

CO2 from NG flaring +0.4 +0.1 -0.5 

Total CH4 + CO2 -9.9 -16.0 -19.8 

Option 2 State 

CH4 from Coal Mining -12.4 -14.5 -12.7 

CH4 from Natural Gas Systems +4.4 +2.4 -1.5 

CO2 from NG flaring +0.4 +0.3 -0.3 

Total CH4 + CO2 -7.7 -11.8 -14.4 

Option 2 Regional 

CH4 from Coal Mining -11.3 -13.4 -11.1 

CH4 from Natural Gas Systems +3.6 +1.8 -2.3 

CO2 from NG flaring +0.2 +0.1 -0.4 

Total CH4 + CO2 -7.4 -11.4 -13.8 

3A.2.2 Sensitivity Analysis: Side Case Incorporating More Coal Production Geographic 

Detail 

A number of factors could potentially affect the changes in upstream emission as a result 

of the policy. Here, we present sensitivity analysis examining the possible effect of shifts in 

regional coal production that might result in a changing the relative share of production 

originating in underground mines and surface mines. This sensitivity analysis is presented 

because underground mining generally emits more CH4 emissions per ton of coal production 

than surface mining. The compliance scenarios show generally larger reductions in coal 

production in the western region where more of the generally lower-emitting surface mining 

takes place. This analysis is characterized as a “sensitivity analysis” as the methods that were 

peer-reviewed as part of the EPA’s contribution to the Climate Action Report, which did not 
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examine alternative coal production scenarios, did not incorporate this geographic component. 

After incorporating this effect, the net upstream CH4 emissions reductions that may result from 

the compliance scenarios are approximately 1 to 2 TgCO2e lower than the results found in the 

main analysis (see Table 3A-7). 

Table 3A-7. Upstream Emissions Changes, Baseline to Compliance Scenarios, 

Side Case Incorporating More Coal Production Geographic Detail 

 Emissions (TgCO2e) 

 2020 2025 2030

Option 1 State 

CH4 from Coal Mining -14.1 -17.4 -17.8

CH4 from Natural Gas Systems +5.1 +2.6 -1.0

CO2 from NG flaring +0.4 +0.2 -0.3

Total CH4 + CO2 -8.6 -14.6 -19.2

Option 1 Regional 

CH4 from Coal Mining -13.1 -16.5 -16.3

CH4 from Natural Gas Systems +4.4 +2.1 -1.7

CO2 from NG flaring +0.4 +0.1 -0.5

Total CH4 + CO2 -8.3 -14.3 -18.5

Option 2 State 

CH4 from Coal Mining -11.2 -13.2 -11.5

CH4 from Natural Gas Systems +4.4 +2.4 -1.5

CO2 from NG flaring +0.4 +0.3 -0.3

Total CH4 + CO2 -6.4 -10.4 -13.2

Option 2 Regional 

CH4 from Coal Mining -10.3 -12.3 -10.0

CH4 from Natural Gas Systems +3.6 +1.8 -2.3

CO2 from NG flaring +0.2 +0.1 -0.4

Total CH4 + CO2 -6.5 -10.3 -12.8

3A.2.3 Uncertainties and Limitations 

Projections of upstream CH4 emissions and CO2 emitted from flaring of CH4 are subject to 

a range of uncertainties and limitations. These uncertainties and limitations include estimating 

the effect of the compliance approach on activity drivers, uncertainty in base year emissions, and 

uncertainties in changes in emissions factors over relatively long periods of time. For example, 

EPA’s application of IPM relies on EIA projections for coal imports and exports. Consequently, 
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coal imports and exports are not able to fully respond within the IPM framework to significant 

fluctuations in power sector coal demand. To the extent international markets may be expected 

to offset reduced domestic coal demand, changes in U.S. upstream emissions as a result of the 

policy scenarios would be smaller than what is presented here. 

Discussion of uncertainty in historical estimates of emissions from coal mining and natural 

gas systems can be found in the 2013 U.S. GHG Inventory. Projected changes in activity drivers 

and emissions factors are based on a combination of policy, macroeconomic, energy market, and 

technology factors which are uncertain in both baseline and compliance scenarios. Relatively 

higher or lower economic growth, or changes in the relative prices or availability of various 

technologies could result in alternative estimates in the net change in upstream CH4 emissions 

and related CO2 emissions. 

3A.3 Methodologies 

3A.3.1 Coal Mining 

The scope of CH4 from coal mining emissions covered in this analysis is discussed above 

in the “General Approach” section. 

 
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Methodology 

EPA calculated emissions projections for this source by summing emissions associated 

with underground mining, post-underground mining, surface mining, and post-surface mining. 

௦,௬ݏ݊݋݅ݏݏ݉݅ܧ ෍	 ൌ ௬ݏ݊݋݅ݏݏ݉݅ܧ

௦

Equation 3 

Where: 

s = Sources (underground, post-underground, surface, and post-surface 

mining) 

Emissionsy,s = Emissions in year y from source s

EPA projected emissions from each source by multiplying an aggregate emissions factor 

by projected coal production (for underground or surface mining as appropriate). Projected 

reductions due to recovery and use are then subtracted from potential emissions.67

ቆ ൈ ௦,௕݊݋݅ݐܿݑ݀݋ݎܲݕݎ݋ݐ݁݊ݒ݊ܫ ൈ ௦,௔௚௚ܨܧ ൌ ௦,௬ݏ݊݋݅ݏݏ݉݅ܧ

௦,௬݊݋݅ݐܿݑ݀݋ݎ݁݀ܲݐ݆݁ܿ݋ݎܲ

௦ቇ,௕݊݋݅ݐܿݑ݀݋ݎ݁݀ܲݐ݆݁ܿ݋ݎܲ

௦ሻܽܿݎܨ݁ݏܷݕݎ݁ݒ݋4ܴ݁ܿܪܥ	 െ 1ሺ ൈ

Equation 4 

Where: 

EFagg,s = Aggregate emissions factor associated with source s

InventoryProductionb,s = Coal production associated with source s in the base 

year from the U.S. GHG Inventory68

ProjectedProductiony,s = Projected coal production associated with the 

emissions source (e.g., either underground or surface 

mining) in year y 

CH4RecoveryUseFracs = Fraction of CH4 recovered from source s 

Emissions Factors 

To calculate potential emissions from each category, EPA calculated an aggregate CH4

emissions factor using historical CH4 emissions and coal production data contained in the most 

recent U.S. GHG Inventory (EPA 2013a). For example, historical CH4 liberated by underground 

mining was divided by the total underground coal production for the corresponding year. The 

aggregate emissions factor is the average of this ratio over the most recent five years. Similar 

 

67 Current CH4 recovery and use projects apply to underground mining, but projects related to surface mining could 

be implemented in the future. 

68 Because of slight differences between historical and projection datasets, values for production in the base year 

from each dataset do not cancel 
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calculations were performed for post-underground mining emissions, surface mining emissions, 

and post-surface mining emissions, using either historical underground or surface mining 

production data as appropriate. 

The projection methodology differs from the estimation methodology used in the U.S. 

GHG Inventory. The inventory does not use emissions factors to calculate CH4 emissions from 

underground mines. The U.S. GHG Inventory estimates total CH4 emitted from underground 

mines as the sum of CH4 liberated from ventilation systems (mine-by-mine measurements) and 

CH4 liberated by means of degasification systems, minus CH4 recovered and used. EPA 

estimated surface mining and post-mining CH4 emissions by multiplying basin-specific coal 

production, obtained from EIA’s Annual Coal Report (EIA 2012), by basin-specific emissions 

factors. 

Coal Production Projections 

For the Sixth U.S. Climate Action Report, EPA projected emissions using projections of 

underground, surface, and total coal production from the EIA Annual Energy Outlook (AEO) 

(EIA 2013). For this analysis, projections of total coal production and production by region were 

drawn from IPM runs performed for the proposal RIA. Projections of underground and surface 

mining were not available outputs for the various scenarios, so two different approaches were 

used to estimate underground and surface mining in the baseline and compliance scenarios. 

The 2013 AEO projects the total coal production for the United States, as well as the coal 

production by region, and by various characteristics including underground and surface mining 

(see AEO table “Coal Production by Region and Type”). In the primary results presented above, 

the breakout between underground and surface mining for projection years in both baseline and 

compliance scenarios is based on the 2013 AEO proportions. This means that the compliance 

approach is assumed not to affect the relative proportion of underground and surface mining in 

the main results. Also, note there has been a general trend toward increasing surface mining 

relative to underground mining (EPA 2013). 

In the sensitivity analysis that incorporated more geographical details into coal production, 

EPA used IPM outputs for coal production from the Appalachian, Interior, and Western regions 

to estimate the proportion of underground versus surface mining in each scenario. This was done 

by assuming that the relative proportion of underground versus surface mining in each coal 
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production region would remain constant through the projection period, but that the national 

proportion of underground and surface production would depend on regional production 

changes. In general, a larger proportion of coal production in the Appalachian and Interior 

regions is from underground mining, while a large majority of coal production in western regions 

is from surface mining. The proportion of underground and surface mining in each region was 

based on averaging the years 2011 and 2012 historical percentages. EIA provides historical 

regional coal production data broken out between underground and surface mining in its Annual 

Coal Report (EIA 2012). EPA collated and calculated the proportion of production, underground 

versus surface, for each year. 

CH4 Mitigation (Recovery and Use) 

EPA projected coal mine CH4 mitigation by calculating the historical fraction of methane 

recovered in relation to generation from underground mines, and applying that fraction to future 

generation. The historical fraction was averaged over the most recent five years. Future 

mitigation was estimated by applying the historical rate of recovery and use to projected 

potential emissions generated. 

The U.S. GHG Inventory uses quantitative estimates of CH4 recovery and use from several 

sources. Several gassy underground coal mines in the United States employ ventilation systems 

to ensure that CH4 levels remain within safe concentrations. Additionally, some U.S. coal mines 

supplement ventilation systems with degasification systems, which remove CH4 from the mine 

and allow the captured CH4 to be used as an energy source. 

௬,௦݁ݏܷݕݎ݁ݒ݋4ܴ݁ܿܪܥ ෍	ൌ ௦ܽܿݎܨ݁ݏܷݕݎ݁ݒ݋4ܴ݁ܿܪܥ

௬,௦ݏ݊݋݅ݏݏ݉݅ܧ݈݅ܽݐ݁݊ݐ݋ܲ

ൗ5

௕ିସ

௬ୀ௕

Equation 5 

Where: 

CH4RecoveryUses,y = Recovered emissions from source s in year y 

Potential Emissionss, y = Potential emissions from source s in year y

b = base year 

3A.3.2 Natural Gas Systems 

The scope of CH4 and CO2 from natural gas systems emissions covered in this analysis are 

discussed above in the “General Approach” section. 

Methodology 
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The methodology for natural gas emissions projections involves the calculation of CH4 and 

CO2 emissions for over 100 emissions source categories across the four natural gas sector stages, 

and then the summation of emissions for each sector stage. The calculation of emissions for each 

source of emissions in natural gas systems generally occurs in three steps: 

1. Calculate potential CH4 (CH4 that would be released in the absence of controls) 

2. Estimate reductions data associated with voluntary action and regulations 

3. Calculate net emissions 

EPA calculated projections of potential CH4 emissions from natural gas systems by 

summing the projections associated with (1) production, (2) processing, (3) transmission and 

storage, and (4) distribution. For the 2014 U.S. Climate Action Report in general, activity data 

were projections of natural gas production and consumption from the Department of Energy’s 

Energy Information Administration, or EIA (EIA 2013). Additional activity data for projections 

included liquefied natural gas (LNG) imports, pipeline length, and number of service lines. For 

this report, activity driver data were taken from IPM outputs for baseline and compliance 

scenarios consistent with the analysis presented in the RIA. Because the base year inventory 

emissions explicitly include reductions due to voluntary and regulatory requirements, the 

projections also include appropriate explicit mitigation projections as well. Emissions for each 

source were estimated using the following equation: 

ܰܧ௦,௬ ൌ ܲܧ௦,௬ െ ܸܴ௦,௬ െ ܴܴ௦,௬

 Equation 6 

Where: 

NEs,y = Projected net emissions for source s in year y

PEs,y = Projected potential emissions for source s in year y

VRs,y, y = Projected voluntary reductions for source s in year y

RRs,y, y = Projected regulatory reductions for source s in year y

The sections below describe detailed calculations for projections of CH4 from natural gas 

systems. This analysis also includes CO2 emissions that result from flaring in the production 

sector.69 The U.S. Greenhouse Gas Inventory also includes other sources of venting, fugitive, and 

flaring CO2 such as CO2 processing emissions from acid gas removal units, which are designed 

to remove CO2 from natural gas. This analysis does not include these other non-combustion CO2

 

69 The GHG Inventory estimate for CO2 from natural gas flaring includes some CO2 from flaring of associated gas. 
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3-17 

sources. EPA calculated projected flaring CO2 emissions by scaling emissions in the base year 

by the increase in projected natural gas production in the IPM scenario outputs consistent with 

the analysis presented in the RIA.

Production Stage 

The production stage includes a total of 35 emissions source categories. Regional 

emissions were estimated in the base year inventory for the six supply regions (i.e., Northeast, 

Gulf Coast, Midcontinent, Southwest, Rocky Mountain, and West Coast) for 33 of these sources. 

Potential Emissions 

EPA estimated future year potential emissions for the production stage using the 

following equation. 

ܲܧ௦,௬ ൌ ܲܧ௦,௕ ൈ ቀ

ீ௔௦	௉௥௢ௗ௨௖௧௜௢௡೤

ீ௔௦	௉௥௢ௗ௨௖௧௜௢௡್

ቁ 

Equation 7 

Where: 

PEs,y, y = Projected future potential emissions for source s in year y

PEs,b, b = Estimated potential emissions for source s in base year b

Gas Productiony = Projected natural gas dry production year y

Gas Productionb = Estimated natural gas dry production for base year b

The natural gas dry production estimates were obtained from the IPM scenario outputs. 

Voluntary Reductions 

Projections of voluntary reductions for the production stage were based on historical data 

reported by industry to the Natural Gas STAR program for projects implemented to reduce 

emissions. Natural Gas STAR tracks projects on an annual basis and assigns a lifetime of limited 

duration to each reduction project; for purposes of the base year emissions inventory and the 

future year projections, the reductions associated with each project were either considered to be a 

“one-year” project or a “permanent” project based on sunset dates provided by the Natural Gas 

STAR program. Reductions from “one-year” projects were typically from the implementation of 

new or modified practices, while reductions from “permanent” projects tended to be from 

equipment installation, replacement, or modification. In the base year emissions inventory and 

the future year projections, reductions for a “one-year” project were limited to the project’s 

reported start year, while reductions for a “permanent” project were assigned to the project’s 

reported start year and every subsequent year thereafter. Thus, the reductions due to “permanent” 
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projects gradually accumulated throughout the inventory time series, while the reductions due to 

“one-year” projects were replaced every year. 

The following production stage voluntary reductions were reported to Natural Gas STAR 

and applied to individual sources in the emissions inventory: 

 Completions for gas wells with hydraulic fracturing (one year)—perform reduced emissions 

completions (RECs).70

 Pneumatic device vents (one year)—reduce gas pressure on pneumatic devices; capture/use gas 

released from gas-operated pneumatic pumps. 

 Pneumatic device vents (permanent)—identify and replace high-bleed pneumatic devices; convert 

pneumatic devices to mechanical controls; convert to instrument air systems; install no-bleed 

controllers. 

 Kimray pumps (permanent)—install/convert gas-driven pumps to electric, mechanical, or solar 

pumps. 

 Gas engines compressor exhaust (one year)—replace ignition/reduce false starts; turbine fuel use 

optimization. 

 Gas engines compressor exhaust (permanent)—convert engine starting to Nitrogen- and/or CO2-

rich gas; install automated air/fuel ratio controls; install lean burn compressors; replace gas starters 

with air or N. 

In addition to these reductions that were applied to specific individual sources in the 

emissions inventory, there were reductions classified as “Other Production” that were applied to 

the overall production stage emissions. 

It was assumed that the percentage of voluntary reductions relative to potential CH4 in the 

most recent base year inventory for the production stage would remain constant in each 

subsequent future year.71 In addition, implementation of the Oil and Natural Gas Sector New 

 

70 The 2014 GHG Inventory includes an update to the methodology for calculating emissions from hydraulically 

fractured gas well completions and workovers. The update uses control/practice-specific emission factors and no 

longer uses potential methane, or reductions data from Gas STAR or from regulations to calculate emissions, as 

emissions are directly calculated using the emission factors. 

71 The assumption of a constant rate of voluntary reductions relative to the base year inventory for sources 

unaffected by regulatory changes is meant to simulate a constant level of effort toward voluntary reductions into 

the future. No enhancements to the voluntary program are assumed. This assumption is a source of uncertainty; 

due to the voluntary nature of the program, reduction levels can fluctuate based on participation and investment. 

Where new regulatory requirements apply to new and modified equipment, voluntary reductions are assumed to 

continue to apply to existing equipment, but no voluntary reductions are applied to new equipment. As a 

potential future improvement to these projections, EPA may develop an alternate methodology to model 

equipment turnover. However, a revised and reviewed methodology that incorporates equipment turnover is 

would likely be developed within the context of preparing the Agency’s submission to the next Climate Action 

Report, which will probably be in the 2017 to 2018 timeframe. 
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Source Performance Standards (NSPS)—discussed further below—necessitates the 

reclassification of certain production reductions from voluntary to regulatory. 

Regulatory Reductions 

As part of the regulatory reductions for the production stage, reductions due to existing Oil 

and Natural Gas Sector National Standards for Hazardous Air Pollutants (NESHAP) 

requirements (EPA. 2012a) for dehydrator vents and condensate tanks without control devices 

were included in the base year inventory. These reductions were carried forward in the future 

year projections. 

In addition, the base year inventory accounted for state-level requirements in Wyoming 

and Colorado for RECs.72 In the base year inventory, a national-level reduction was estimated by 

applying a 95 percent REC reduction to the fraction of national emissions occurring in Wyoming 

and Colorado (i.e., 15.1 percent); this resulted in a national-level reduction of 14.35 percent for 

gas well completions and workovers with hydraulic fracturing. These reductions were modified 

as described below. 

The Oil and Natural Gas Sector NSPS for VOCs (EPA 2012a, finalized in 2012) 

significantly increased the amount of regulatory reductions applicable to the production stage, 

resulting in substantial CH4 emissions reductions co-benefits. These reductions are not currently 

reflected in the 2013 U.S. GHG Inventory for the base year 2011, but are projected for future 

years as discussed in detail below. The specific Oil and Natural Gas Sector NSPS requirements 

impact the following production stage sources with regard to VOC (and the associated CH4) 

emissions: 

 Hydraulically fractured natural gas well completions 

 Hydraulically refractured natural gas well recompletions 

 New and modified high-bleed, gas-driven pneumatic controllers 

 New storage tanks (with VOC emissions of 6 tons per year or more) 

 New and modified reciprocating and centrifugal compressors at gathering and boosting 

stations 

 

72 The 2014 GHG Inventory includes an update to the methodology for calculating emissions from hydraulically 

fractured gas well completions and workovers. The update uses control/practice-specific emission factors and no 

longer uses potential methane, or reductions data from Gas STAR or from regulations to calculate emissions, as 

emissions are directly calculated using the emission factors. 
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The impact of these requirements on the future year projections is discussed below. The 

specific quantitative reductions calculated for these projections are based on information from 

the Oil and Natural Gas Sector NSPS Background Technical Support Document for the 

Proposed Standards (EPA 2011) and the Background Supplemental Technical Support 

Document for the Final New Source Performance Standards (EPA 2012b), referred to 

collectively in this document as the Oil and Natural Gas Sector NSPS TSD. 

Hydraulically Fractured Well Completions 

The Oil and Natural Gas Sector NSPS requires the use of RECs (or “green completions”) 

for all new hydraulically-fractured natural gas well completions. A phase-in period prior to 

January 1, 2015, also allows for the alternate use of a completion combustion device (i.e., flare), 

instead of RECs. In addition, RECs are not required for exploratory “wildcat” wells, delineation 

wells (i.e., used to define the borders of a natural gas reservoir), and low-pressure wells (i.e., 

completions where well pressure is too low to perform RECs); in these instances, emissions must 

be reduced using combustion. Based on the Oil and Natural Gas Sector NSPS TSD (EPA 

2012b), EPA assumed for the purpose of these projections a 95 percent reduction for both RECs 

and completion combustion.73

Although the base year inventory included a national-level reduction of 14.35 percent to 

account for the required use of RECs in Wyoming and Colorado, there does not appear to be an 

appreciable difference in emissions reductions resulting from the Oil and Natural Gas Sector 

NSPS requirements and the state requirements in Wyoming and Colorado. Therefore, for future 

year projections, the national-level reduction of 14.35 percent was replaced with a 95 percent 

reduction for new hydraulically fractured well completions. 

Hydraulically Refractured Well Workovers 

The Oil and Natural Gas Sector NSPS also requires the use of RECs for gas wells that are 

refractured and recompleted. The phase-in period before January 1, 2015, is also applicable.74 As 

 

73 The Oil and Natural Gas Sector NSPS TSD indicates that 90 percent of flowback gas can be recovered during an 

REC (based on Natural Gas STAR data) and that any amount of gas that cannot be recovered can be directed to a 

completion combustion device in order to achieve a minimum 95 percent reduction in emissions. The Oil and 

Natural Gas Sector NSPS TSD indicates that although industrial flares are required to meet a combustion 

efficiency of 98 percent, this is not required for completion combustion devices. Completion combustion devices 

(i.e., exploration and production flares) can be expected to achieve 95 percent combustion efficiency. 

74 Use of RECs is not considered to be “modified” and would not trigger state permitting requirements, while use of 

flaring or completion combustion would be considered to be “modified.” 
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3-21 

with completions, a 95 percent reduction was assumed for both RECs and completion 

combustion. This replaced the national-level reduction of 14.35 percent that was used in the base 

year inventory. 

For both well completions and workovers (or refractured well completions) with hydraulic 

fracturing, in conjunction with the Oil and Natural Gas Sector NSPS, EPA removed REC-related 

reductions from the projected voluntary reductions from the production stage to avoid doublecounting. This removal was very straightforward, since these REC-related reductions were 

calculated separately and then applied to the well completions and workovers source in the base 

year inventory. 

New and Modified High-Bleed, Gas-Driven Pneumatic Controllers

The Oil and Natural Gas Sector NSPS also requires the installation of new low-bleed 

pneumatic devices (i.e., bleed rates less than or equal to 6 standard cubic feet per hour) instead of 

high-bleed pneumatic devices (i.e., bleed rates greater than 6 standard cubic feet per hour) with 

exceptions where high bleed devices are required for safety reasons. The TSD indicates that a 

typical production stage high-bleed pneumatic device emits 6.91 tons of CH4 per year and that 

replacing the high-bleed device with a typical low-bleed pneumatic device would result in a 

reduction of 6.65 tons CH4 per year; this is a reduction of 96.2 percent. The TSD also indicates 

that only 51 percent of all pneumatic devices installed are continuous bleed natural gas driven 

controllers. In addition, it is assumed that 20 percent of the situations where bleed pneumatic 

devices are installed require a high-bleed device (i.e., instances where a minimal response time is 

needed, large valves require a high bleed rate to actuate, or a safety isolation valve is involved) 

(EPA 2011). Based on this information, for the purpose of these projections EPA applied a 

national-level reduction of 77 percent (i.e., 0.962 × 0.8) to each future year’s annual increase in 

emissions from pneumatic device vents in the production stage. 

In conjunction with the Oil and Natural Gas Sector NSPS, no removal of production stage 

voluntary reductions was required. The reductions included in the base year inventory already 

occurred in the past and the associated effects carry forward into the future or were unrelated to 

the requirements of the Oil and Natural Gas Sector NSPS. 

New Storage Tanks 
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3-22 

The Oil and Natural Gas Sector NSPS also requires that new storage tanks with VOC 

emissions of 6 tons per year or greater must reduce VOC emissions by at least 95 percent, likely 

to be accomplished by routing emissions to a combustion device or rerouting emissions into 

process streams. The Oil and Natural Gas Sector NSPS TSD indicates that approximately 74 

percent of the total condensate produced in the United States passes through storage tanks with 

VOC emissions of 6 tons per year or greater (EPA 2011). Based on this information, for the 

purpose of these projections EPA applied a national-level reduction of 70.3 percent (i.e., 0.95 × 

0.74) to each future year’s annual increase in emissions from condensate storage tanks in the 

production stage. 

In conjunction with the Oil and Natural Gas Sector NSPS, no removal of production stage 

voluntary reductions associated with storage tanks was required. The reductions included in the 

base year inventory already occurred in the past and the associated effects carry forward into the 

future. 

New and Modified Reciprocating Compressors 

The Oil and Natural Gas Sector NSPS requires the replacement of rod packing systems in 

new and modified reciprocating compressors at gathering and boosting stations. There are two 

options for this replacement: every 26,000 hours of operation if operating hours are monitored 

and documented, or every 36 months if operating hours are not monitored or documented. The 

Oil and Natural Gas Sector NSPS TSD estimated baseline emissions of 3,773 tons per year of 

CH4 for new reciprocating compressors used in the production stage; the TSD also estimated 

total reductions from replacing the rod packing for these compressors as 2,384 tons per year of 

CH4 (EPA 2011). Based on this information, for the purpose of these projections EPA applied a 

national-level reduction of 63.2 percent to each future year’s annual increase in emissions from 

gathering reciprocating compressors in the production stage. 

Processing Stage 

The processing stage includes a total of 11 emissions source categories. EPA estimated the 

base year inventory emissions for the processing stage at the national level, instead of at the 

region level, like the base year inventory emissions for the production stage. 

Potential Emissions 
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3-23 

Because projections of future year processing activity were not available, EPA also used 

Equation 7 to estimate future year potential emissions for the processing stage by assuming that 

the quantity of processed natural gas would track closely with the quantity of produced natural 

gas. 

As with the production stage, EPA used the natural gas dry production estimates from the 

IPM scenario outputs. 

Voluntary Reductions 

Projections of voluntary reductions for the processing stage were based on historical data 

reported by industry to the Natural Gas STAR program for projects implemented to reduce 

emissions (EPA 2012c). The following processing stage voluntary reductions were reported to 

Natural Gas STAR and applied to individual sources in the emissions inventory: 

 Blowdowns/venting (one year)—recover gas from pipeline pigging operations; redesign 

blowdown/alter ESD practices; reduce emissions when taking compressors offline; use composite 

wrap repair; use hot taps for in-service pipeline connections; use inert gas and pigs to perform 

pipeline purges. 

 Blowdowns/venting (permanent)—rupture pin shutoff device to reduce venting. 

In addition to these reductions that were applied to specific individual sources in the 

emissions inventory, there were reductions classified as “Other Processing” that were applied to 

the overall processing stage emissions. 

It was assumed that the percentage of voluntary reductions relative to potential CH4 in the 

most recent base year inventory for the processing stage would remain constant in each 

subsequent future year.75 In addition, implementation of the Oil and Natural Gas Sector NSPS 

(discussed further below) necessitates the reclassification of certain processing reductions from 

voluntary to regulatory. 

Regulatory Reductions 

 

75 This assumption is discussed in Footnote 7. 
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3-24 

The only regulatory reductions included in the base year inventory for the processing stage 

were existing Oil and Natural Gas Sector NESHAP requirements for dehydrator vents (EPA 

2013). These reductions were carried forward in the future year projections. 

The Oil and Natural Gas Sector NSPS significantly increased the amount of regulatory 

reductions applicable to the processing stage relative to the base year 2011 inventory estimates. 

The specific Oil and Natural Gas Sector NSPS requirements affect the following processing 

stage sources with regard to VOC (and the associated CH4) emissions: 

 New and modified reciprocating compressors 

 New and modified centrifugal compressors 

 New and modified high-bleed, gas-driven pneumatic controllers 

 New storage tanks (with VOC emissions of at least 6 tons per year) 

The impact of these requirements on the future year projections is discussed below. 

New and Modified Reciprocating Compressors 

The Oil and Natural Gas Sector NSPS requires the replacement of rod packing systems in 

new and modified reciprocating compressors. There are two options for this replacement: every 

26,000 hours of operation if operating hours are monitored and documented, or every 36 months 

if operating hours are not monitored or documented. The Oil and Natural Gas Sector NSPS TSD 

estimated baseline emissions of 4,870 tons per year of CH4 for new reciprocating compressors 

used in the processing stage; the Oil and Natural Gas Sector NSPS TSD also estimated total 

reductions from replacing the rod packing for these compressors as 3,892 tons per year of CH4

(EPA 2011). Based on this information, for the purpose of these projections EPA applied a 

national-level reduction of 79.9 percent to each future year’s annual increase in emissions from 

reciprocating compressors in the processing stage. 

New and Modified Centrifugal Compressors 

The Oil and Natural Gas Sector NSPS requires a 95 percent reduction in VOC emissions 

from new and modified centrifugal compressors with wet seal systems, which can be 

accomplished through flaring or by routing captured gas back to a compressor suction or fuel 

system, or switching to dry seal systems. The Oil and Natural Gas Sector NSPS does not apply to 

centrifugal compressors with dry seal systems, because they have low VOC emissions. A 
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3-25 

national-level reduction of 95 percent was applied to each future year’s annual increase in 

emissions from centrifugal compressors with wet seals in the processing stage. 

In conjunction with the Oil and Natural Gas Sector NSPS, no removal of processing stage 

voluntary reductions was required. The reductions included in the base year inventory already 

occurred in the past and the associated effects carry forward into the future or were unrelated to 

the requirements of the Oil and Natural Gas Sector NSPS. 

1.1.1.1.1.1.1 New and Modified High-Bleed, Gas-Driven Pneumatic Controllers 

The Oil and Natural Gas Sector NSPS also requires that the VOC emissions limit for 

continuous-bleed, gas-driven pneumatic controls at gas processing plants be zero. Accordingly, 

emissions from new pneumatic device vents in the processing stage were set to zero. 

New Storage Tanks 

As described above in the production sector. 

Transmission and Storage Stage 

The transmission and storage stage includes a total of 37 emissions source categories: 25 

associated with natural gas transmission and storage and 12 associated with liquefied natural gas 

(LNG) transmission and storage. The natural gas and LNG emissions were estimated at the 

national level. 

Potential Emissions 

Future year potential emissions for the natural gas sources and the six LNG storage sources 

within the transmission and storage stage were estimated using the following equation: 

ܲܧ௦,௬ ൌ ܲܧ௦,௕ ൈ ቀ

ீ௔௦	஼௢௡௦௨௠௣௧௜௢௡೤

ீ௔௦	஼௢௡௦௨௠௣௧௜௢௡್

ቁ 

Equation 8 

Where: 

PEs,y = Projected future potential emissions for source s in year y

PEs,b = Estimated potential emissions for source s in base year b

Gas Consumptiony = Projected national natural gas consumption in year y

Gas Consumptionb = Estimated national natural gas consumption in base year b

The national natural gas consumption estimates were obtained from the IPM scenario 

outputs. 

Future year potential emissions for the six LNG import terminal sources within the 

transmission and storage stage were estimated using the following equation: 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

3-26 

ܲܧ௦,௬ ൌ ܲܧ௦,௕ ൈ ቀ

௅ேீ	ூ௠௣௢௥௧௦೤

௅ேீ	ூ௠௣௢௥௧௦್

ቁ 

Equation 9 

Where: 

PEs,y = Projected future potential emissions for source s in year y

PEs,b = Estimated potential emissions for source s in base year b

LNG Importsy = Projected LNG imports in year y

LNG Importsb = Estimated LNG imports in base year b

The LNG import estimates were obtained from the table titled “Natural Gas Imports and 

Exports” of the IPM scenario outputs. The specific estimates used were for the “Liquefied 

Natural Gas Imports” line item. 

Voluntary Reductions 

Projections of voluntary reductions for the transmission and storage stage were also based 

on historical data reported by industry to the Natural Gas STAR program for projects 

implemented to reduce emissions. The following transmission and storage stage voluntary 

reductions were reported to Natural Gas STAR and applied to individual sources in the base year 

emissions inventory: 

 Reciprocating compressors (one year)—replace compressor rod packing systems. 

 Reciprocating compressors (permanent)—replace wet seals with dry seals. 

 Pipeline venting (one year)—recover gas from pipeline pigging operations; use composite wrap 

repair; use hot taps for in-service pipeline connections; use inert gas and pigs to perform pipeline 

purges; use pipeline pump-down techniques to lower gas line pressure. 

 Pneumatic devices (permanent)—identify and replace high-bleed pneumatic devices; convert 

pneumatic devices to mechanical controls; convert to instrument air systems. 

In addition to these reductions that were applied to specific individual sources in the 

emissions inventory, there were reductions classified as “Other Transmission and Storage” that 

were applied to the overall transmission and storage stage emissions. 

It was assumed that the percentage of voluntary reductions relative to potential CH4 in the 

most recent base year inventory for the transmission and storage stage would remain constant in 

each subsequent future year.76 In addition, implementation of the Oil and Natural Gas Sector 

 

76 This assumption is discussed in Footnote 7. 
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3-27 

NSPS (discussed further below) necessitates the reclassification of certain reductions from 

voluntary to regulatory. 

Regulatory Reductions 

No regulatory reductions were previously included in the inventory for the transmission 

and storage stage. 

The Oil and Natural Gas Sector NSPS includes requirements applicable to the natural gas 

transmission and storage stage for VOC reductions of at least 95 percent for new storage tanks 

with VOC emissions of 6 tons per year or more. 

The impact of these requirements on the future year projections is discussed below. 

New Storage Tanks 

As described above in the production sector. 

Distribution Stage 

The distribution stage includes a total of 23 emissions source categories consisting of 10 

city gate sources, two customer meter sources, three vented sources, and eight pipeline leak 

sources. For all sources, emissions were estimated at the national level. 

Potential Emissions 

Because future year distribution projections were not available, EPA estimated future year 

potential emissions for the distribution stage (except for the pipeline leak sources) using 

Equation 3, assuming that the quantity of distributed natural gas tracks closely with the quantity 

of consumed natural gas.77 The natural gas consumption estimates were obtained from the IPM 

scenario outputs. Sector-specific consumption estimates were used. For most sources (i.e., all 

city gate, all vented, and the residential customer meter sources), the “Natural Gas” line item 

under “Residential Consumption” was used. For the commercial/industry sources, EPA used the 

summation of the “Natural Gas” line item under “Commercial Consumption” and the “Natural 

Gas Subtotal” line item (including natural gas, natural gas-to-liquids heat and power, and lease 

and plant fuel) under “Industrial Consumption.” 

 

77 Many natural gas power plants are connected directly to transmission and distribution pipelines, and thus an 

increase in consumption of natural gas by power plants might not lead to a proportional change in CH4 emissions 

from the distribution segment of the natural gas system. The current projection methodology uses total natural 

gas consumption as an activity driver to project emissions from non-pipeline leak sources in the distribution 

segment. EPA examined how the results would differ if the distribution segment were excluded. Depending on 

the scenario and year, the net emissions change between the base case and policy cases was reduced by up to 0.9 

TgCO2e or increased by up to 0.4 TgCO2e, assuming the change in power plant natural gas consumption had no 

effect on distribution-segment methane emissions. 
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3-28 

Unlike most other sources in the natural gas systems emissions inventory, projected 

pipeline leak emissions in the distribution stage were not estimated using natural gas production 

or consumption estimates. Instead, linear extrapolation of historical pipeline miles was used to 

project leak emissions from distribution mains, while linear extrapolation of the historical 

number of service lines was used to project leak emissions from services. Linear extrapolation 

was used because the historical statistics for pipeline miles and number of services show fairly 

consistent behavioral trends over the entire time series from 1990 to 2011. In particular, the 

historical statistics show a distinct trend toward the use of plastic and away from other materials 

(i.e., cast iron, copper, unprotected steel, and protected steel). Historical pipeline length data was 

drawn from the US GHG Inventory (EPA 2013), which draws pipeline data from a variety of 

sources. 

Voluntary Reductions 

Projections of voluntary reductions for the distribution stage were based on historical data 

reported by industry to the Natural Gas STAR program for projects implemented to reduce 

emissions. Unlike the production, processing, and transmission and storage stages, no 

distribution stage voluntary reductions reported to Natural Gas STAR were applied to individual 

sources in the emissions inventory. However, there were reductions classified as “Other 

Distribution” that were applied to the overall distribution stage emissions. 

It was assumed that the percentage of voluntary reductions relative to potential CH4 in the 

most recent base year inventory for the transmission stage would remain constant in each 

subsequent future year.78

Regulatory Reductions 

There were no requirements in the Oil and Natural Gas Sector NSPS that impact emissions 

from the distribution stage. 

 

78 This assumption is discussed in Footnote 7. 
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3-29 

3A.4 References 

IPCC. 2006. “2006 IPCC Guidelines for National Greenhouse Gas Inventories.” Available at: 

<http://www.ipcc-nggip.iges.or.jp/public/2006gl/>. 

U. S. Department of State. 2014. “2014 U.S. Climate Action Report to the UNFCCC.” Available 

at: < http://www.state.gov/e/oes/rls/rpts/car6/index.htm>. 

U. S. Energy Information Administration (EIA). 2012. “Annual Coal Report 2011.” Available at: 

<http://www.eia.gov/coal/annual/>. 

U. S. EIA. 2013. “Annual Energy Outlook 2013.” Available at: 

<http://www.eia.gov/forecasts/aeo/>. 

U. S. Environmental Protection Agency. 1993. Anthropogenic Methane Emissions in the United 

States, Estimates for 1990: Report to Congress. (EPA document number EPA-430-R-93-003). 

U. S. EPA. 2011. “Oil and Natural Gas Sector: Standards of Performance for Crude Oil and 

Natural Gas Production, Transmission, and Distribution: Background Technical Support 

Document for the Proposed Standards.” Available at: 

<http://epa.gov/airquality/oilandgas/pdfs/20110728tsd.pdf>. 

U. S. EPA. 2012a. “Oil and Natural Gas Sector: New Source Performance Standards and 

National Emission Standards for Hazardous Air Pollutants Reviews.” 40 CFR Parts 60 and 63 

[EPA-HQ-OAR-2010-0505; FRL-9665-1], RIN 2060-AP76. Available at: 

<http://www.gpo.gov/fdsys/pkg/FR-2012-08-16/pdf/2012-16806.pdf>. 

U. S. EPA. 2012b. “Oil and Natural Gas Sector: Standards of Performance for Crude Oil and 

Natural Gas Production, Transmission, and Distribution: Background Supplemental Technical 

Support Document for the Final New Source Performance Standards.” Available at: 

<http://epa.gov/airquality/oilandgas/pdfs/20120418tsd.pdf>. 

U.S. EPA. 2012c. “Natural Gas STAR Reductions 1990-2011.” Natural Gas STAR Program. 

U.S. EPA. 2013a. Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990–2011. (EPA 

document number EPA-430-R-13-001). Available at: 

<http://www.epa.gov/climatechange/ghgemissions/usinventoryreport.html>. 

U.S. EPA. 2013b. “Methodologies for U.S. Greenhouse Gas Emissions Projections: Non-CO2

and Non-Energy CO2 Sources.” Available at: 

<http://www.state.gov/documents/organization/219472.pdf> 
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3-1 

CHAPTER 4: ESTIMATED CLIMATE BENEFITS AND HUMAN HEALTH CO-BENEFITS

4.1 Introduction 

Implementing the proposed Emission Guidelines for Greenhouse Gas (GHG) Emissions 

from Existing Stationary Sources: Electric Utility Generating Units (EGUs) (hereafter, EGU 

GHG Existing Source Guidelines) is expected to reduce emissions of carbon dioxide (CO2) and 

have ancillary human health benefits (i.e., co-benefits) associated with lower ambient 

concentrations of criteria air pollutants. This chapter describes the methods used to estimate the 

monetized climate benefits and the monetized air pollution health co-benefits associated with 

reducing exposure to ambient fine particulate matter (PM2.5) and ozone by reducing emissions of 

precursor pollutants (i.e., sulfur dioxide (SO2), nitrogen dioxide (NO2), and directly emitted 

PM2.5). Data, resource, and methodological limitations prevent EPA from monetizing the 

benefits from several important co-benefit categories, including reducing direct exposure to SO2, 

NO2, and hazardous air pollutants (HAP), as well as ecosystem effects and visibility impairment. 

We qualitatively discuss these unquantified benefits in this chapter. 

This chapter provides estimates of the monetized climate benefits and air pollution health 

co-benefits associated with emission reductions for two options with two illustrative compliance 

scenarios across several analysis years and discount rates. The estimated benefits associated with 

these emission reductions are beyond those achieved by previous EPA rulemakings, including 

the Mercury and Air Toxics Standards (MATS). 

4.2 Estimated Climate Benefits from CO2 

The primary goal of the proposed guidelines is to reduce emissions of CO2. In this section, 

we provide an overview of the climate science assessments released since the 2009 

Endangerment Finding. We also provide information regarding the economic valuation of CO2

using the Social Cost of Carbon (SCC), a metric that estimates the monetary value of impacts 

associated with marginal changes in CO2 emissions in a given year. Table 4-1 summarizes the 

quantified and unquantified climate benefits in this analysis. 

Deleted: public health and public welfare effects 

associated with climate change
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

3-2 

Table 4-1. Climate Effects 

Benefits 

Category 

Specific Effect Effect Has Been 

Quantified 

Effect Has Been 

Monetized 

More 

Information 

Improved Environment 

Reduced 

climate effects 

Global climate impacts from CO2 —  SCC TSD 

Climate impacts from ozone and black 

carbon (directly emitted PM) 

— — Ozone ISA, PM 

ISA*

Other climate impacts (e.g., other GHGs 

such as methane, aerosols, other impacts) 

— — IPCC*

* We assess these co-benefits qualitatively because we do not have sufficient confidence in available data or 

methods. 

4.2.1 Climate Change Impacts 

In 2009, the EPA Administrator found that “six greenhouse gases taken in combination 

endanger both the public health and the public welfare of current and future generations.”82 The 

specific public health and public welfare impacts are detailed in the 2009 Endangerment Finding 

and its record. 

A number of major peer-reviewed scientific assessments have been released since the 

administrative record concerning the Endangerment Finding closed following the EPA’s 2010 

Reconsideration Denial. These assessments include the IPCC’s 2012 “Special Report on 

Managing the Risks of Extreme Events and Disasters to Advance Climate Change Adaptation” 

(SREX), the IPCC and 2013-14 Fifth Assessment Report (AR5), the 2014 National Climate 

Assessment report, the NRC 2010 “Ocean Acidification: A National Strategy to Meet the 

Challenges of a Changing Ocean” (Ocean Acidification), NRC 2011 “Report on Climate 

Stabilization Targets: Emissions, Concentrations, and Impacts over Decades to Millennia” 

(Climate Stabilization Targets), NRC 2011 ““National Security Implications for U.S. Naval 

Forces” (National Security Implications), NRC 2011 “Understanding Earth’s Deep Past: Lessons 

for Our Climate Future” (Understanding Earth’s Deep Past), NRC 2012 “Sea Level Rise for the 

Coasts of California, Oregon, and Washington: Past, Present, and Future”, NRC 2012 “Climate 

and Social Stress: Implications for Security Analysis” (Climate and Social Stress), and NRC 

2013 “Abrupt Impacts of Climate Change” (Abrupt Impacts) assessments. 

 

82 “Endangerment and Cause or Contribute Findings for Greenhouse Gases Under Section 202(a) of the Clean Air 

Act,” 74 Fed. Reg. 66,496 (Dec. 15, 2009) (“Endangerment Finding”). 

Deleted: 4.2.1 Public Health Effects from 

Climate Change¶

Climate change threatens public health in a number 

of ways: direct temperature effects, the effect of 

higher atmospheric CO2 concentrations on 

characteristics of air quality, changes in vector-borne 

diseases, and changes in the severity and frequency 

of extreme weather events. This section summarizes 

the 2009 Endangerment Finding’s conclusions for 

each of these effects in turn.79¶

Heat is already the leading cause of weather-related 

deaths in the United States, and heat waves are 

associated with marked short-term increases in 

mortality and morbidity. It has already been 

observed that unusually hot days and heat waves are 

becoming more frequent, and that unusually cold 

days are becoming less frequent. In the future, severe 

heat waves are projected to further intensify in 

magnitude and duration over the portions of the ... [2]

Comment [A53]: OMB comment: As per our 

discussion on 5/27, this section and the next should 

not attempt to characterize or shorten the 

endangerment finding. 

We suggest EPA either: 

1. Refer the readers to the endangerment finding 

and the public health effects section – ie replace 

this all with a citation/cross reference 

2. Indent and quote the major/relevant findings 

from the endangerment finding. 

Given that this is the RIA and you don’t need to have 

a lengthy discussion, the former may be the most 

expeditious way to address our comment. 

EPA response: As an alternative, could we use the 

language from the 111b RIA (Chapter 3 of 

http://www2.epa.gov/sites/production/files/2013-

09/documents/20130920proposalria.pdf)? 

However, we are moving forward on the assumption 

that we will use option 1. 

Comment [A54]: OMB comment: In the 

endangerment finding or not? We suggest moving to 

the new section if this wasn’t in the EF. 

EPA response: Discussion deleted. 

Deleted: 3 

Comment [A55]: OMB Comment: IN this 

section, we first accepted your new text so that the 

suggestions are clearer. 

EPA response: Thanks. 

Deleted: in New Assessments

Deleted: USGCRP’s 

Deleted: “Climate Change Impacts in the United 

States” (Climate Change Impacts), and

Deleted: ’s

Comment [A56]: OMB comment: Are these all 

NRC repts? If so, pls add NRC at the beginning of 

each title. And either provide full title or 

citation/URL 

EPA response: NRC added, these are full titles. 
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3-3 

The EPA has reviewed these assessments and finds that in general, the improved 

understanding of the climate system they present are consistent with the assessments underlying 

the 2009 Endangerment Finding. 

The IPCC report, the National Climate Assessment, and three of the new NRC assessments 

provide estimates of projected global sea level rise. These estimates, while not always directly 

comparable as they assume different emissions scenarios and baselines, are at least 40 percent 

larger than, and in some cases more than twice as large as, the rise estimated in a 2007 IPCC 

assessment of between 0.18 and 0.59 meters by the end of the century, relative to 1990. (It 

should be noted that in 2007, the IPCC stated that including poorly understood ice sheet 

processes could lead to an increase in the projections.) While these NRC and IPCC assessments 

continue to recognize and characterize the uncertainty inherent in accounting for ice sheet 

processes, these revised estimates are consistent with the assessments underlying the existing 

finding that GHGs are reasonably anticipated to endanger public health and welfare. Other key 

findings of the recent assessments are described briefly below. 

According to the IPCC in the SREX, “A changing climate leads to changes in the 

frequency, intensity, spatial extent, duration, and timing of extreme weather and climate events, 

and can result in unprecedented extreme weather and climate events.” The SREX documents 

observational evidence of changes in some weather and climate extremes that have occurred 

globally since 1950. The assessment also provides evidence regarding the cause of some of these 

changes to elevated concentrations of GHGs, including warming of extreme daily temperatures, 

intensified extreme precipitation events, and increases in extreme coastal high water levels due to 

rising sea level. The SREX projects further increases in some extreme weather and climate 

events during the 21st century. Combined with increasing vulnerability and exposure of 

populations and assets, increases in extreme weather and climate events have consequences for 

disaster risk, with particular impacts on the water, agriculture and food security and health 

sectors. 

In its Climate Stabilization Targets assessment, the NRC states, “Emissions of carbon 

dioxide from the burning of fossil fuels have ushered in a new epoch where human activities will 

largely determine the evolution of Earth’s climate. Because carbon dioxide in the atmosphere is 

Deleted: strengthens the case that GHGs endanger 

public health and welfare

Comment [A57]: Suggested text change from 

OMB: “are consistent with the assessment 

underlying the GHGs endangerment finding.” 

OMB comment: Similar to the way we approach the 

PM benefits discussion, it is better for EPA to say 

“consistent with” rather than “strengthens the case” 

We will also flag the need for any changes in the 

preambles, if necessary, to conform to these changes. 

EPA response: Revised text. 

Comment [A58]: OMB comment: newest? 

EPA response: No. 

Deleted: that 

Comment [A59]: OMB comment: Need a more 

precise term than “larger”. One might infer from the 

sentence that the new assessments are larger with 

respect to the most likely scenario for SLR. 

However, my recollection is that at least one of the 

new assessments is only “larger” with respect to the 

upward bound of SLR. Suggest adding a sentence or 

two to explain which estimator is larger (e.g., mean, 

median, upward bound of range, etc.). 

EPA response: Comparisons between assessments 

can be a bit tricky because of differences in 

emissions scenario and differences in baseline: 

For example, the 0.5-1.0m from the NRC climate 

stabilization assessment is specifically the A1B 

scenario, which should be compared to the 0.21 to 

0.48 A1B range from AR4. The other NRC 

assessment low end estimates are 0.4 and 0.5 m 

respectively, and the NCA low end is 30 cm (1 foot). 

The raw AR5 assessment range is 0.26 to 0.82 m, 

which is larger than 0.18 to 0.59 meters even as a 

raw estimate. However, AR5 includes the RCP2.6 

emissions scenario which is a much lower scenario 

than anything considered by AR4 (which didn’t ... [3]

Deleted: strongly support and strengthen

Comment [A60]: OMB suggested edit: “are 

consistent with the assessment underlying” 

EPA response: OK. 

Deleted: 

Deleted: changes 

Comment [A61]: OMB suggested edit: 

“increases” 

EPA response: Done.. ... [4]

Deleted: the 

Comment [A62]: OMB suggested edit: “its” 

EPA response: Done. 

Deleted: :

Deleted: ¶
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

3-4 

long lived, it can effectively lock Earth and future generations into a range of impacts, some of 

which could become very severe.”

The assessment concludes that carbon dioxide emissions will alter the atmosphere’s 

composition and therefore the climate for thousands of years; and attempts to quantify the results 

of stabilizing GHG concentrations at different levels. The report also projects the occurrence of 

several specific climate change impacts, finding warming could lead to increases in heavy 

rainfall and decreases in crop yields and Arctic sea ice extent, along with other significant 

changes in precipitation and stream flow. For an increase in global average temperature of 1 to 2 

oC above pre-industrial levels, the assessment projects that the area burnt by wildfires in western 

North America will likely more than double and coral bleaching and projects that erosion will 

likely increase due both to warming and ocean acidification. An increase of 3 oC is projected to 

lead to a sea level rise of 0.5 to 1 meter by 2100. With an increase of 4 oC, the average summer 

in the United States is projected to be as warm as the warmest summers of the past century. The 

assessment notes that although many important aspects of climate change are difficult to 

quantify, the risk of adverse impacts is likely to increase with increasing temperature, and the 

risk of surprises can be expected to increase with the duration and magnitude of the warming. 

The NRC assessment on Sea Level Rise projects a global sea level rise of 0.5 to 1.4 meters 

by 2100, which is sufficient to lead to rising relative sea level even in the northern states. The 

NRC National Security Implications assessment considers potential impacts of sea level rise and 

suggests that “the Department of the Navy should expect roughly 0.4 to 2 meters global average 

sea-level rise by 2100. This assessment also recommends preparing for increased needs for 

humanitarian aid; responding to the effects of climate change in geopolitical hotspots, including 

possible mass migrations; and addressing changing security needs in the Arctic as sea ice 

retreats. The NRC Climate and Social Stress assessment found that it would be “prudent for 

security analysts to expect climate surprises in the coming decade . . . and for them to become 

progressively more serious and more frequent thereafter[.]” 

The NRC Understanding Earth’s Deep Past assessment finds that “the magnitude and rate 

of the present greenhouse gas increase place the climate system in what could be one of the most 

severe increases in radiative forcing of the global climate system in Earth history.” This 

assessment finds that CO2 concentrations by the end of the century, without a reduction in 

Comment [A63]: OMB suggests adding 

quotation marks. 

OMB comment: Please confirm that this is a 

quotation. 

EPA response: Yes, it is. Added quotation marks. 

Deleted: “¶

Deleted: found 

Comment [A64]: OMB suggested text: 

“projects” 

EPA response: Done. 

Comment [A65]: OMB suggested text: “projects 

that erosion” 

EPA response: Done. 

Comment [A66]: OMB suggested text: “likely 

increase” 

EPA response: Done. 

Deleted: will 

Comment [A67]: OMB suggested text: “is 

projected to be” 

EPA response: Done. 

Deleted: would 

Comment [A68]: OMB suggested text: 

“projects” 

EPA response: Done. 

Deleted: Another 

Deleted: A third 

Deleted: Another 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

3-5 

emissions, are projected to increase to levels that Earth has not experienced for more than 30 

million years. 

Similarly, the NRC Ocean Acidification assessment finds that “[t]he chemistry of the 

ocean is changing at an unprecedented rate and magnitude due to anthropogenic carbon dioxide 

emissions; the rate of change exceeds any known to have occurred for at least the past hundreds 

of thousands of years.” The assessment notes that the full range of consequences is still 

unknown, but the risks “threaten coral reefs, fisheries, protected species, and other natural 

resources of value to society.” 

The most recent assessments to be released were the IPCC AR5 assessments between 

September 2013 and April 2014, the NRC Abrupt Impacts assessment in December of 2013, and 

the U.S. National Climate Assessment in May of 2014. The NRC Abrupt Impacts report 

examines the potential for tipping points, thresholds beyond which major and rapid changes 

occur in the Earth’s climate system or other systems impacted by the climate. The Abrupt 

Impacts report did find less cause for concern than some previous assessments regarding some 

abrupt events within the next century such as disruption of the Atlantic Meridional Overturning 

Circulation (AMOC) and sudden releases of high-latitude methane from hydrates and 

permafrost, but found that the potential for abrupt changes in ecosystems, weather and climate 

extremes, and groundwater supplies critical for agriculture now seem more likely, severe, and 

imminent. The assessment found that some abrupt changes were already underway (Arctic sea 

ice retreat and increases in extinction risk due to the speed of climate change), but cautioned that 

even abrupt changes such as the AMOC disruption that are not expected in this century can have 

severe impacts when they happen. 

The IPCC AR5 assessments are also generally consistent with the underlying science 

supporting the 2009 Endangerment Finding. For example, confidence in attributing recent 

warming to human causes has increased: the IPCC stated that it is extremely likely (>95% 

confidence) that human influences have been the dominant cause of recent warming. Moreover, 

the IPCC found that the last 30 years were likely (>66% confidence) the warmest 30 year period 

in the Northern Hemisphere of the past 1400 years, that the rate of ice loss of worldwide glaciers 

and the Greenland and Antarctic ice sheets has likely increased, that there is medium confidence 

that the recent summer sea ice retreat in the Arctic is larger than has been in 1450 years, and that 

Deleted: an 

Deleted: on ocean acidification 

Deleted: USGCRP Climate Impacts

Deleted: a

Deleted: confirm and strengthen previous findings

Comment [A69]: OMB suggested text: “The 

IPCC AR5 assessments also generally consistent 

with the prior finding.” 

OMB comment: If this comment is referring to to 

EPA’s Endangerment Finding, it is better for EPA to 

say “ are consistent with” rather than “confirm and 

strengthen” . However, if this is referring to the 

prior IPCC report, make that clear in the sentence, 

and use a quote. 

EPA response: Done. 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

3-6 

concentrations of carbon dioxide and several other of the major greenhouse gases are higher than 

they have been in at least 800,000 years. Climate-change induced impacts have been observed in 

changing precipitation patterns, melting snow and ice, species migration, negative impacts on 

crops, increased heat and decreased cold mortality, and altered ranges for water-borne illnesses 

and disease vectors. Additional risks from future changes include death, injury, and disrupted 

livelihoods in coastal zones and regions vulnerable to inland flooding, food insecurity linked to 

warming, drought, and flooding, especially for poor populations, reduced access to drinking and 

irrigation water for those with minimal capital in semi-arid regions, and decreased biodiversity in 

marine ecosystems, especially in the Arctic and tropics, with implications for coastal livelihoods. 

The IPCC determined that “[c]ontinued emissions of greenhouse gases will cause further 

warming and changes in all components of the climate system. Limiting climate change will 

require substantial and sustained reductions of greenhouse gases emissions. 

Finally, the recently released National Climate Assessment stated, “Climate change is already 

affecting the American people in far reaching ways. Certain types of extreme weather events 

with links to climate change have become more frequent and/or intense, including prolonged 

periods of heat, heavy downpours, and, in some regions, floods and droughts. In addition, warming is causing sea level to rise and glaciers and Arctic sea ice to melt, and oceans are becoming 

more acidic as they absorb carbon dioxide. These and other aspects of climate change are 

disrupting people’s lives and damaging some sectors of our economy.” Assessments from these 

bodies represent the current state of knowledge, comprehensively cover and synthesize 

thousands of individual studies to obtain the majority conclusions from the body of scientific 

literature and undergo a rigorous and exacting standard of review by the peer expert community 

and U.S. government. 

4.2.2 Social Cost of Carbon 

We estimate the global social benefits of CO2 emission reductions expected from the 

proposed guidelines using the SCC estimates presented in the 2013 Technical Support 

Document: Technical Update of the Social Cost of Carbon for Regulatory Impact Analysis 

Under Executive Order 12866 (2013 SCC TSD).83 We refer to these estimates, which were 

 

83 Docket ID EPA-HQ-OAR-2013-0495, Technical Support Document: Technical Update of the Social Cost of 

Carbon for Regulatory Impact Analysis Under Executive Order 12866, Interagency Working Group on Social 

Cost of Carbon, with participation by Council of Economic Advisers, Council on Environmental Quality, 

Deleted: future 

Deleted: , and that l

Comment [A70]: OMB comment: Please use a 

direct quote. 

EPA response: Done. 

Deleted: USGCRP “Climate Change Impacts

Deleted: ”

Deleted: a

Deleted: emphasizes that climate change is already 

happening now and it is happening in the United 

States. The assessment documents the increases in 

some extreme weather and climate events in recent 

decades, the damage and disruption to infrastructure 

and agriculture, and projects continued increase and 

more severe changes across a wide range of peoples, 

sectors, and ecosystems.¶

The EPA plans to continue relying heavily on the 

major assessments by the USGCRP, the IPCC, and 

the NRC to summarize the state of climate science 

and to inform EPA actions related to climate change. 

Comment [A71]: OMB comment: Please use a 

quote from the executive summary of the USGCRP 

instead of a one sentence paraphrase of the entire 

report. 

EPA response: Done. 

Comment [A72]: OMB deleted this sentence. 

OMB comment: Deleted sentence seems like a 

policy statement, not necessarily appropriate for the 

RIA. 

EPA response: OK. 

Deleted: 4 

Comment [A73]: OMB comment: Given the 

open IQ request for correction, has EPA considering 

adopting the text in the most recent response for this 

section? 

In addition, barring your response to that question, 

you check this section carefully for typos and 

readability. 

EPA response: We are not aware of open 

information quality act requests – are you referring 

to the IQA petition submitted by API and other 

industry groups? My understanding is that OMB has 

responded to that petition. The OMB response to 

that petition does not seem appropriate as a 

replacement for the SCC discussion in the RIA. 

Consistent with past EPA RIAs, the text has been 

pulled from the SCC TSDs (which were heavily 

vetted). Please let us know if you think there is a 

particular topic in this section that is out of date or 

missing. (We are not aware of any). 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

3-7 

developed by the U.S. government, as “SCC estimates.” The SCC is a metric that estimates the 

monetary value of impacts associated with marginal changes in CO2 emissions in a given year. It 

includes a wide range of anticipated climate impacts, such as net changes in agricultural 

productivity and human health, property damage from increased flood risk, and changes in 

energy system costs, such as reduced costs for heating and increased costs for air conditioning. It 

is typically used to assess the avoided damages as a result of regulatory actions (i.e., benefits of 

rulemakings that have an incremental impact on cumulative global CO2 emissions). 

The SCC estimates used in this analysis were developed over many years, using the best 

science available, and with input from the public. The EPA and other federal agencies have 

considered the extensive public comments on ways to improve SCC estimation received via the 

notice and comment period that was part of numerous rulemakings since 2006. In addition, 

OMB’s Office of Information and Regulatory Affairs recently sought public comment on the 

approach used to develop the SCC estimates. The comment period ended on February 26, 2014, 

and OMB is reviewing the comments received. 

An interagency process that included the EPA and other executive branch entities used 

three integrated assessment models (IAMs) to develop SCC estimates and selected four global 

values for use in regulatory analyses. The SCC estimates were first released in February 2010 

and updated in 2013 using new versions of each IAM. 84 

The SCC estimates represent global measures because of the distinctive nature of the 

climate change problem. The climate change problem is highly unusual in at least two respects. 

First, emissions of most GHGs contribute to damages around the world even when they are 

 Department of Agriculture, Department of Commerce, Department of Energy, Department of Transportation, 

Environmental Protection Agency, National Economic Council, Office of Energy and Climate Change, Office of 

Management and Budget, Office of Science and Technology Policy, and Department of Treasury (May 2013, 

Revised November 2013). Available at: 

http://www.whitehouse.gov/sites/default/files/omb/assets/inforeg/technical-update-social-cost-of-carbon-forregulator-impact-analysis.pdf. 

84 Docket ID EPA-HQ-OAR-2009-0472-114577, Technical Support Document: Social Cost of Carbon for 

Regulatory Impact Analysis Under Executive Order 12866, Interagency Working Group on Social Cost of 

Carbon, with participation by Council of Economic Advisers, Council on Environmental Quality, Department of 

Agriculture, Department of Commerce, Department of Energy, Department of Transportation, Environmental 

Protection Agency, National Economic Council, Office of Energy and Climate Change, Office of Management 

and Budget, Office of Science and Technology Policy, and Department of Treasury (February 2010). Available at: 

http://www.whitehouse.gov/sites/default/files/omb/inforeg/for-agencies/Social-Cost-of-Carbon-for-RIA.pdf. See 

previous citation for 2013 SCC TSD.
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3-8 

emitted in the United States. The SCC must therefore incorporate the full (global) damages 

caused by GHG emissions in order to address the global nature of the problem. Second, climate 

change presents a problem that the United States alone cannot solve. The US now operates in a 

global, highly interconnected economy such that impacts on the other side of the world now 

affect our economy. Climate damages in other countries can affect U.S. companies. Climateexacerbated conflict can require military expenditures by the U.S. All of this means that the true 

cost of climate change to U.S. is much larger than impacts that simply occur in the U.S. Climate 

change presents a problem that the United States alone cannot solve. A global number is the 

economically appropriate reference point for collective actions to reduce climate change. 

A key objective in the development of the SCC estimates was to enable a consistent 

exploration of three integrated assessment models (DICE, FUND, and PAGE)85 while respecting 

the different approaches to quantifying damages taken by the key modelers in the field. The 

selection of the three input parameters (equilibrium climate sensitivity, reference socioeconomic 

scenarios, discount rate) was based on an extensive review of the literature. Specifically, a 

probability distribution for climate sensitivity was specified as an input into all three models. In 

addition, the interagency group used a range of scenarios for the socio-economic parameters and 

a range of values for the discount rate. All other model features were left unchanged, relying on 

the model developers’ best estimates and judgments. In DICE, these parameters are handled 

deterministically and represented by fixed constants; in PAGE, most parameters are represented 

by probability distributions. FUND was also run in a mode in which parameters were treated 

probabilistically. The use of three models and these input parameters allowed for exploration of 

important uncertainties in the way climate damages are estimated, equilibrium climate 

sensitivity, reference socioeconomic and emission trajectories, and discount rate. As stated in the 

2010 SCC TSD, however, key uncertainties remain as the existing models are imperfect and 

incomplete. See the 2010 SCC TSD for a complete discussion of the methods used to develop 

the estimates and the key uncertainties, and the 2013 SCC TSD for the updated estimates. 

Notably, the 2013 process did not revisit the 2010 interagency modeling decisions (e.g., 

with regard to the discount rate, reference case socioeconomic and emission scenarios or 

 

85 The full models names are as follows: Dynamic Integrated Climate and Economy (DICE); Climate Framework for 

Uncertainty, Negotiation, and Distribution (FUND); and Policy Analysis of the Greenhouse Gas Effect (PAGE). 

Deleted: along 

Comment [A74]: OMB comment: Should this be 

“alone”? 

EPA response: Yes.
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

3-9 

equilibrium climate sensitivity). Rather, improvements in the way damages are modeled are 

confined to those that have been incorporated into the latest versions of the models by the 

developers themselves and used in peer-reviewed publications. The model updates that are 

relevant to the SCC estimates include: an explicit representation of sea level rise damages in the 

DICE and PAGE models; updated adaptation assumptions, revisions to ensure damages are 

constrained by GDP, updated regional scaling of damages, and a revised treatment of potentially 

abrupt shifts in climate damages in the PAGE model; an updated carbon cycle in the DICE 

model; and updated damage functions for sea level rise impacts, the agricultural sector, and 

reduced space heating requirements, as well as changes to the transient response of temperature 

to the buildup of GHG concentrations and the inclusion of indirect effects of methane emissions 

in the FUND model. The 2013 SCC TSD provides complete details. 

When attempting to assess the incremental economic impacts of carbon dioxide emissions, 

the analyst faces a number of serious challenges. A report from the National Academies of 

Science (NRC, 2009) points out that any assessment will suffer from uncertainty, speculation, 

and lack of information about (1) future emissions of greenhouse gases, (2) the effects of past 

and future emissions on the climate system, (3) the impact of changes in climate on the physical 

and biological environment, and (4) the translation of these environmental impacts into 

economic damages.86 As a result, any effort to quantify and monetize the harms associated with 

climate change will raise serious questions of science, economics, and ethics and should be 

viewed as provisional. 

The 2010 SCC TSD noted a number of limitations to the SCC analysis, including the 

incomplete way in which the integrated assessment models capture catastrophic and noncatastrophic impacts, their incomplete treatment of adaptation and technological change, 

uncertainty in the extrapolation of damages to high temperatures, and assumptions regarding risk 

aversion. Current integrated assessment models do not assign value to all of the important 

physical, ecological, and economic impacts of climate change recognized in the climate change 

literature due to a lack of precise information on the nature of damages and because the science 

incorporated into these models understandably lags behind the most recent research. The limited 

 

86 National Research Council (2009). Hidden Costs of Energy: Unpriced Consequences of Energy Production and 

Use. National Academies Press. See docket ID EPA-HQ-OAR-2009-0472-11486. 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

3-10 

amount of research linking climate impacts to economic damages makes the modeling exercise 

even more difficult. These individual limitations do not all work in the same direction in terms of 

their influence on the SCC estimates, though taken together they suggest that the SCC estimates 

are likely conservative. In particular, the IPCC Fourth Assessment Report (2007) concluded that 

“It is very likely that [SCC estimates] underestimate the damage costs because they cannot 

include many non-quantifiable impacts.” 

Nonetheless, these estimates and the discussion of their limitations represent the best 

available information about the social benefits of CO2 reductions to inform benefit-cost analysis. 

The new versions of the models used to estimate the values presented below offer some 

improvements in these areas, although further work remains warranted. Accordingly, the EPA 

and other agencies continue to engage in research on modeling and valuation of climate impacts 

with the goal to improve these estimates. Additional details are provided in the SCC TSDs. 

The four SCC estimates, updated in 2013, are as follows: $13, $46, $68, and $137 per 

metric ton of CO2 emissions in the year 2020 (2011$).87 The first three values are based on the 

average SCC from the three IAMs, at discount rates of 5, 3, and 2.5 percent, respectively. SCC 

estimates for several discount rates are included because the literature shows that the SCC is 

quite sensitive to assumptions about the discount rate, and because no consensus exists on the 

appropriate rate to use in an intergenerational context (where costs and benefits are incurred by 

different generations). The fourth value is the 95th percentile of the SCC from all three models at 

a 3 percent discount rate. It is included to represent higher-than-expected impacts from 

temperature change further out in the tails of the SCC distribution (representing less likely, but 

potentially catastrophic, outcomes). 

Table 4-2 presents the updated global SCC estimates for the years 2015 to 2050. In order 

to calculate the dollar value for emission reductions, the SCC estimate for each emissions year 

would be applied to changes in CO2 emissions for that year, and then discounted back to the 

analysis year using the same discount rate used to estimate the SCC.88 The SCC increases over 

 

87 The 2010 and 2013 TSDs present SCC in 2007$. The estimates were adjusted to 2011$ using GDP Implicit Price 

Deflator, http://www.gpo.gov/fdsys/pkg/ECONI-2013-02/pdf/ECONI-2013-02-Pg3.pdf. 

88 This analysis considered the climate impacts of only CO2 emission change. As discussed below, the climate 

impacts of other pollutants were not calculated for the proposed guidelines. Furthermore, the U.S. Interagency 

Working Group on the Social Cost of Carbon has so far only considered estimates for the social cost of CO2. 

While CO2 is the dominant GHG emitted by the sector, we recognize the representative facilities within these 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

3-11 

time because future emissions are expected to produce larger incremental damages as physical 

and economic systems become more stressed in response to greater climate change. Note that the 

interagency group estimated the growth rate of the SCC directly using the three integrated 

assessment models rather than assuming a constant annual growth rate. This helps to ensure that 

the estimates are internally consistent with other modeling assumptions. Tables 4-3 through 4-5 

report the incremental climate benefits estimated in three analysis years (2020, 2025, and 2030) 

for the two illustrative compliance scenarios (i.e., state and regional) for two options evaluated. 

Table 4-2. Global Social Cost of CO2, 2015-2050 (in 2011$)* 

Year 

Discount Rate and Statistic 

5% Average 3% Average 2.5% Average 3% (95th percentile) 

2015 $12 $39 $61 $116

2020 $13 $46 $68 $137

2025 $15 $50 $74 $153

2030 $17 $55 $80 $170

2035 $20 $60 $85 $187

2040 $22 $65 $92 $204

2045 $26 $70 $98 $220

2050 $28 $76 $104 $235

* The SCC values vary depending on the year of CO2 emissions and are defined in real terms, i.e., adjusted for 

inflation using the GDP implicit price deflator. These SCC values are stated in $/metric ton. 

Table 4-3. Estimated Global Climate Benefits of CO2 Reductions for Proposed EGU GHG 

Existing Source Guidelines in 2020 (billions of 2011$)* 

Discount Rate and Statistic Option 1 – 

state 

Option 1 – 

regional 

Option 2 – 

state 

Option 2 - 

regional 

Million metric tonnes of CO2 reduced 383 371 295 283 

5% (average) $4.9 $4.7 $3.8 $3.6 

3% (average) $18 $17 $14 $13 

2.5% (average) $26 $25 $20 $19 

3% (95th percentile) $52 $51 $40 $39 

* The SCC values are dollar-year and emissions-year specific. SCC values represent only a partial accounting of 

climate impacts. 

 comparisons may also have different emission rates for other climate forcers that will serve a minor role in 

determining the overall social cost of generation. 
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3-12 

Table 4-4. Estimated Global Climate Benefits of CO2 Reductions for Proposed EGU GHG 

Existing Source Guidelines in 2025 (billions of 2011$)* 

Discount Rate and Statistic Option 1 – 

state 

Option 1 - 

regional 

Option 2 – 

state 

Option 2 - 

regional 

Million metric tonnes of CO2 reduced 506 501 376 368 

5% (average) $7.6 $7.5 $5.6 $5.5 

3% (average) $25 $25 $19 $18 

2.5% (average) $37 $37 $28 $27 

3% (95th percentile) $77 $76 $57 $56 

* The SCC values are dollar-year and emissions-year specific. SCC values represent only a partial accounting of 

climate impacts. 

Table 4-5. Estimated Global Climate Benefits of CO2 Reductions for Proposed EGU GHG 

Existing Source Guidelines in 2030 (billions of 2011$)* 

Discount Rate and Statistic Option 1 – 

state 

Option 1 - 

regional 

Option 2 – 

state 

Option 2 - 

regional 

Million metric tonnes of CO2 reduced 555 545 373 353 

5% (average) $9.5 $9.3 $6.4 $6.0 

3% (average) $31 $30 $21 $20 

2.5% (average) $44 $44 $30 $28 

3% (95th percentile) $94 $92 $63 $60 

* The SCC values are dollar-year and emissions-year specific. SCC values represent only a partial accounting of 

climate impacts. 

It is important to note that the climate benefits presented above are associated with changes 

in CO2 emissions only. Implementing these guidelines, however, will have an impact on the 

emissions of other pollutants that would affect the climate. Both predicting reductions in 

emissions and estimating the climate impacts of these other pollutants, however, is complex. 

The climate impacts of these other pollutants have not been calculated for the proposed 

guidelines.89 

The other emissions potentially reduced as a result of these guidelines include other 

greenhouse gases (such as methane), aerosols and aerosol precursors such as black carbon, 

organic carbon, sulfur dioxide and nitrogen oxides, and ozone precursors such as nitrogen oxides 

and volatile organic carbon compounds. Changes in emissions of these pollutants (both increases 

and decreases) could directly result from changes in electricity generation, upstream fossil fuel 

extraction and transport, and/or downstream secondary market impacts. Reductions in black 

carbon or ozone precursors are projected to lead to further cooling, but reductions in the other 

aerosol species and precursors are projected to lead to warming. Therefore, changes in non-CO2

 

89 The federal government’s SCC estimates are designed to assess the climate benefits associated with changes in 

CO2 emissions only. 
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pollutants could potentially augment or offset the climate benefits calculated here. These 

pollutants can act in different ways and on different timescales than carbon dioxide. For 

example, aerosols reflect (and in the case of black carbon, absorb) incoming radiation, whereas 

greenhouse gases absorb outgoing infrared radiation. In addition, these aerosols are thought to 

affect climate indirectly by altering properties of clouds. Black carbon can also deposit on snow 

and ice, darkening these surfaces and accelerating melting. In terms of lifetime, while carbon 

dioxide emissions can increase concentrations in the atmosphere for hundreds or thousands of 

years, many of these other pollutants are short lived and remain in the atmosphere for short 

periods of time ranging from days to weeks and can therefore exhibit large spatial and temporal 

variability. 

While the EPA has not quantified the climate impacts of these other pollutants for the 

proposed guidelines, the Agency has analyzed the potential changes in upstream methane 

emissions from the natural gas and coal production sectors that may result from the compliance 

scenarios examined in this RIA in the appendix to Chapter 3. The EPA assessed whether the net 

change in upstream methane emissions from natural gas and coal production is likely to be 

positive or negative and also assessed the potential magnitude of changes relative to CO2

emissions reductions anticipated at power plants. This assessment included CO2 emissions from 

the flaring of methane, but did not evaluate potential changes in other combustion-related CO2

emissions, such as emissions associated with drilling, mining, processing, and transportation in 

the natural gas and coal production sectors. This analysis found that the net upstream CH4

emissions from natural gas systems and coal mines and CO2 emissions from flaring of methane 

will likely decrease under the proposed guidelines. Furthermore, the analysis suggests that the 

changes in upstream methane emissions are small relative to the changes in direct emissions 

from power plants. 

4.3 Estimated Human Health Co-Benefits 

In addition to CO2, implementing these proposed guidelines is expected to reduce 

emissions of SO2 and NOX, which are precursors to formation of ambient PM2.5, as well as 

directly emitted fine particles.90 Therefore, reducing these emissions would also reduce human 

 

90 We estimate the health co-benefits associated with emission reductions of two categories of directly emitted 

particles: elemental carbon plus organic carbon (EC+OC) and crustal. Crustal emissions are composed of 

compounds associated with minerals and metals from the earth’s surface, including carbonates, silicates, iron, 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

3-14 

exposure to ambient PM2.5 and the incidence of PM2.5-related health effects. In addition, in the 

presence of sunlight, NOX and VOCs can undergo a chemical reaction in the atmosphere to form 

ozone. Depending on localized concentrations of volatile organic compounds (VOCs), reducing 

NOX emissions would also reduce human exposure to ozone and the incidence of ozone-related 

health effects. Although we do not have sufficient data to quantify these impacts in this analysis, 

reducing emissions of SO2 and NOx would also reduce ambient exposure to SO2 and NO2, 

respectively. In this section, we provide an overview of the monetized PM2.5 and ozone-related 

co-benefits estimated for the proposed guidelines. The estimated co-benefits associated with 

these emission reductions are beyond those achieved by previous EPA rulemakings, including 

MATS. A full description of the underlying data, studies, and assumptions is provided in the PM 

NAAQS RIA (U.S. EPA, 2012a) and Ozone NAAQS RIA (U.S. EPA, 2008b, 2010d). 

There are several important considerations in assessing the air pollution-related health cobenefits for a climate-focused rulemaking. First, these estimated health co-benefits do not 

account for any climate-related air quality changes (e.g., increased ambient ozone associated 

with higher temperatures) but rather changes in precursor emissions affected by this rulemaking. 

Excluding climate-related air quality changes may underestimate ozone-related health cobenefits. It is unclear how PM2.5-related health co-benefits would be impacted by excluding 

climate-related air quality changes since the science is unclear as to how climate change may 

affect PM2.5 exposure. Second, the estimated health co-benefits also do not consider temperature 

modification of PM2.5 and ozone risks (Roberts 2004; Ren 2006a, 2006b, 2008a, 2008b). Third, 

the estimated climate benefits reported in this RIA reflect global benefits, while the estimated 

health co-benefits are calculated for the contiguous U.S. only. Excluding temperature 

modification of air pollution risks and international air pollution-related health benefits implies 

that the quantified health co-benefits likely lead to underestimation. 

Implementing these guidelines may lead to reductions in ambient PM2.5 concentrations 

below the National Ambient Air Quality Standards (NAAQS) for PM and ozone in some areas 

and assist other areas with attaining these NAAQS. Because the NAAQS RIAs (U.S. EPA, 

2012a, 2008b, 2010d) also calculated PM and ozone benefits, there are important differences 

 phosphates, copper, and zinc. Often, crustal material represents particles not classified as one of the other species 

(e.g., organic carbon, elemental carbon, nitrate, sulfate, chloride, etc.). 
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3-15 

worth noting in the design and analytical objectives of each RIA. The NAAQS RIAs illustrate 

the potential costs and benefits of attaining a revised air quality standard nationwide based on an 

array of emission reduction strategies for different sources including known and unknown 

controls, incremental to implementation of existing regulations and controls needed to attain the 

current standards. In short, NAAQS RIAs hypothesize, but do not predict, the reduction 

strategies that States may choose to enact when implementing a revised NAAQS. The setting of 

a NAAQS does not directly result in costs or benefits, and as such, EPA’s NAAQS RIAs are 

merely illustrative and the estimated costs and benefits are not intended to be added to the costs 

and benefits of other regulations that result in specific costs of control and emission reductions. 

However, it is possible that some costs and benefits estimated in this RIA may account for the 

same air quality improvements as estimated in the illustrative NAAQS RIAs. 

Similar to NAAQS RIAs, the emission reduction scenarios estimated for the proposed 

guidelines are also illustrative. In contrast to NAAQS RIAs, all of the emission reductions for the 

illustrative compliance scenarios would occur in one well-characterized sector (i.e., the EGU 

sector). In general, EPA is more confident in the magnitude and location of the emission 

reductions for implementation rules, which typically require specific emission reductions in a 

specific sector. As such, emission reductions achieved under promulgated implementation rules 

will ultimately be reflected in the baseline of future NAAQS analyses, which would reduce the 

incremental costs and benefits associated with attaining revised future NAAQS. EPA does not 

re-issue illustrative RIAs outside of the rulemaking process that retroactively update the baseline 

to account for implementation rules promulgated after an RIA was completed. For more 

information on the relationship between illustrative analyses, such as for the NAAQS and this 

proposal, and implementation rules, please see Section 1.3 of the PM NAAQS RIA (U.S. EPA, 

2012a). 

4.3.1 Health Impact Assessment for PM2.5 and Ozone 

The Integrated Science Assessment for Particulate Matter (PM ISA) (U.S. EPA, 2009b) 

identified the human health effects associated with ambient PM2.5 exposure, which include 

premature morality and a variety of morbidity effects associated with acute and chronic 

exposures. Similarly, the Integrated Science Assessment for Ozone and Related Photochemical 

Oxidants (Ozone ISA) (U.S. EPA, 2013b) identified the human health effects associated with 
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3-16 

ambient ozone exposure, which include premature morality and a variety of morbidity effects 

associated with acute and chronic exposures. Table 4-6 identifies the quantified and unquantified 

co-benefit categories captured in EPA’s health co-benefits estimates for reduced exposure to 

ambient PM2.5 and ozone. Although the table below does not list unquantified health effects such 

as those associated with exposure to SO2, NO2, and mercury nor welfare effects such as 

acidification and nutrient enrichment, these effects are described in detail in Chapters 5 and 6 of 

the PM NAAQS RIA (U.S. EPA, 2012a) and summarized later in this chapter. It is important to 

emphasize that the list of unquantified benefit categories is not exhaustive, nor is quantification 

of each effect complete. 
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3-17 

 Table 4-6. Human Health Effects of Ambient PM2.5 and Ozone 

Category Specific Effect 

Effect Has 

Been 

Quantified 

Effect Has 

Been 

Monetized 

More 

Information 

Improved Human Health 

Reduced incidence of 

premature mortality 

from exposure to 

PM2.5

Adult premature mortality based on cohort study 

estimates and expert elicitation estimates (age >25 or 

age >30) 

  PM ISA 

Infant mortality (age <1)   PM ISA

Reduced incidence of 

morbidity from 

exposure to PM2.5

Non-fatal heart attacks (age > 18)   PM ISA

Hospital admissions—respiratory (all ages)   PM ISA

Hospital admissions—cardiovascular (age >20)   PM ISA

Emergency room visits for asthma (all ages)   PM ISA

Acute bronchitis (age 8-12)   PM ISA

Lower respiratory symptoms (age 7-14)   PM ISA

Upper respiratory symptoms (asthmatics age 9-11)   PM ISA

Asthma exacerbation (asthmatics age 6-18)   PM ISA

Lost work days (age 18-65)   PM ISA

Minor restricted-activity days (age 18-65)   PM ISA

Chronic Bronchitis (age >26) — — PM ISA

Emergency room visits for cardiovascular effects (all 

ages) — — PM ISA1

Strokes and cerebrovascular disease (age 50-79) — — PM ISA1

Other cardiovascular effects (e.g., other ages) — — PM ISA2

Other respiratory effects (e.g., pulmonary function, 

non-asthma ER visits, non-bronchitis chronic 

diseases, other ages and populations) 

— — PM ISA2

Reproductive and developmental effects (e.g., low 

birth weight, pre-term births, etc) — — PM ISA2,3

Cancer, mutagenicity, and genotoxicity effects — — PM ISA2,3

Reduced incidence of 

mortality from 

exposure to ozone 

Premature mortality based on short-term study 

estimates (all ages)   Ozone ISA 

Premature mortality based on long-term study 

estimates (age 30–99) — — Ozone ISA1

Reduced incidence of 

morbidity from 

exposure to ozone 

Hospital admissions—respiratory causes (age > 65)   Ozone ISA 

Hospital admissions—respiratory causes (age <2)   Ozone ISA 

Emergency department visits for asthma (all ages)   Ozone ISA 

Minor restricted-activity days (age 18–65)   Ozone ISA 

School absence days (age 5–17)   Ozone ISA 

Decreased outdoor worker productivity (age 18–65) — — Ozone ISA1

Other respiratory effects (e.g., premature aging of 

lungs) — — Ozone ISA2

Cardiovascular and nervous system effects — — Ozone ISA2

Reproductive and developmental effects — — Ozone ISA2,3

1

 We assess these co-benefits qualitatively due to data and resource limitations for this analysis, but we have 

quantified them in sensitivity analyses for other analyses. 

2

 We assess these co-benefits qualitatively because we do not have sufficient confidence in available data or 

methods. 
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3 We assess these co-benefits qualitatively because current evidence is only suggestive of causality or there are other 

significant concerns over the strength of the association. 

We follow a “damage-function” approach in calculating benefits, which estimates changes 

in individual health endpoints (specific effects that can be associated with changes in air quality) 

and assigns values to those changes assuming independence of the values for those individual 

endpoints. Because EPA rarely has the time or resources to perform new research to measure 

directly, either health outcomes or their values for regulatory analyses, our estimates are based 

on the best available methods of benefits transfer, which is the science and art of adapting 

primary research from similar contexts to estimate benefits for the environmental quality change 

under analysis. We use a “benefit-per-ton” approach to estimate the PM2.5 and ozone co-benefits 

in this RIA. This section describes the underlying basis for the health and economic valuation 

estimates, and the subsequent section provides an overview of the benefit-per-ton estimates, 

which are described in detail in the appendix to this chapter. 

The health impact assessment (HIA) quantifies the changes in the incidence of adverse 

health impacts resulting from changes in human exposure to PM2.5 and ozone. We use the 

environmental Benefits Mapping and Analysis Program (BenMAP) (version 4.0.66) to 

systematize health impact analyses by applying a database of key input parameters, including 

population projections, health impact functions, and valuation functions (Abt Associates, 2012). 

For this assessment, the HIA is limited to those health effects that are directly linked to ambient 

PM2.5 and ozone concentrations. There may be other indirect health impacts associated with 

reducing emissions, such as occupational health exposures. Epidemiological studies generally 

provide estimates of the relative risks of a particular health effect for a given increment of air 

pollution (often per 10 μg/m3

 for PM2.5 or ppb for ozone). These relative risks can be used to 

develop risk coefficients that relate a unit reduction in PM2.5 to changes in the incidence of a 

health effect. We refer the reader to the PM NAAQS RIA (U.S. EPA, 2012a) and Ozone 

NAAQS RIA (U.S. EPA, 2008b, 2010d) for more information regarding the epidemiology 

studies and risk coefficients applied in this analysis, and we briefly elaborate on adult premature 

mortality below. The size of the mortality effect estimates from epidemiological studies, the 

serious nature of the effect itself, and the high monetary value ascribed to prolonging life make 

mortality risk reduction the most significant health endpoint quantified in this analysis. 

Comment [A75]: OMB comment: Is MATS in 

the baseline? 

EPA response: Yes. We have clarified that these 

emission reductions are beyond MATS in sections 

4.1, 4.3, and 4.5.1. 

Comment [A76]: OMB comment: Given how 

large the co-benefits are – larger than the CO2 

benefits – EPA should commit to doing scenario 

specific air quality modeling for the final rule. 

EPA response: Given the structure of 111(d) and the 

focus on climate benefits, we believe that the 

benefit-per-ton analysis that we have conducted to 

estimate the air pollution health co-benefits is 

appropriate. However, we recognize that more 

precise air quality modeling can be informative. 
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Considering a substantial body of published scientific literature and reflecting thousands of 

epidemiology, toxicology, and clinical studies, the PM ISA documents the association between 

elevated PM2.5 concentrations and adverse health effects, including increased premature mortality 

(U.S. EPA, 2009b). The PM ISA, which was twice reviewed by the Clean Air Scientific 

Advisory Committee of EPA’s Science Advisory Board (SAB-CASAC) (U.S. EPA-SAB, 2009b, 

2009c), concluded that there is a causal relationship between mortality and both long-term and 

short-term exposure to PM2.5 based on the entire body of scientific evidence. The PM ISA also 

concluded that the scientific literature consistently finds that a no-threshold log-linear model 

most adequately portrays the PM-mortality concentration-response relationship while 

recognizing potential uncertainty about the exact shape of the concentration-response function. 

In addition to adult mortality discussed in more detail below, we use effect coefficients from 

Woodruff et al. (1997) to estimate PM-related infant mortality. 

For adult PM-related mortality, we use the effect coefficients from the most recent 

epidemiology studies examining two large population cohorts: the American Cancer Society 

cohort (Krewski et al., 2009) and the Harvard Six Cities cohort (Lepeule et al., 2012). The PM 

ISA (U.S. EPA, 2009b) concluded that the ACS and Six Cities cohorts provide the strongest 

evidence of the association between long-term PM2.5 exposure and premature mortality with 

support from a number of additional cohort studies. The SAB’s Health Effects Subcommittee 

(SAB-HES) also supported using these two cohorts for analyses of the benefits of PM reductions 

(U.S. EPA-SAB, 2010a). As both the ACS and Six Cities cohort studies have inherent strengths 

and weaknesses, we present PM2.5 co-benefits estimates using relative risk estimates from both 

these cohorts (Krewski et al., 2009; Lepeule et al., 2012). 

As a characterization of uncertainty regarding the adult PM2.5-mortality relationship, EPA 

graphically presents the PM2.5 co-benefits derived from EPA’s expert elicitation study (Roman et 

al., 2008; IEc, 2006). The primary goal of the 2006 study was to elicit from a sample of health 

experts probabilistic distributions describing uncertainty in estimates of the reduction in 

mortality among the adult U.S. population resulting from reductions in ambient annual average 

PM2.5 concentrations. In that study, twelve experts provided independent opinions regarding the 

4.3.1.1 Mortality Concentration-Response Functions for PM2.5
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PM2.5-mortality concentration-response function. Because the experts relied upon the ACS and 

Six Cities cohort studies to inform their concentration-response functions, the benefits estimates 

derived from the expert responses generally fall between results derived from these studies (see 

Figure 4-1). We do not combine the expert results in order to preserve the breadth and diversity 

of opinion on the expert panel. This presentation of the expert-derived results is generally 

consistent with SAB advice (U.S. EPA-SAB, 2008), which recommended that the EPA 

emphasize that “scientific differences existed only with respect to the magnitude of the effect of 

PM2.5 on mortality, not whether such an effect existed” and that the expert elicitation “supports 

the conclusion that the benefits of PM2.5 control are very likely to be substantial”. Although it is 

possible that newer scientific literature could revise the experts’ quantitative responses if elicited 

again, we believe that these general conclusions are unlikely to change. 

4.3.1.2 Mortality Concentration-Response Functions for Ozone 

In 2008, the National Academies of Science (NRC, 2008) issued a series of 

recommendations to the EPA regarding the quantification and valuation of ozone-related shortterm mortality. Chief among these was that “...short-term exposure to ambient ozone is likely to 

contribute to premature deaths” and the committee recommended that “ozone-related mortality 

be included in future estimates of the health benefits of reducing ozone exposures...” The NAS 

also recommended that “...the greatest emphasis be placed on the multicity and NMMAPS 

[National Morbidity, Mortality, and Air Pollution Study] studies without exclusion of the metaanalyses” (NRC, 2008). In view of the findings of the National Academies panel, we estimate the 

co-benefits of avoiding short-term ozone mortality using the Bell et al. (2004) NMMAPS 

analysis, the Schwartz (2005) multi-city study, the Huang et al. (2005) multi-city study as well as 

effect estimates from the three meta-analyses (Bell et al. (2005), Levy et al. (2005), and Ito et al. 

(2005)). These studies are consistent with the studies used in the Ozone NAAQS RIA (U.S. 

EPA, 2008b, 2010d).91 For simplicity, we report the ozone mortality estimates in this RIA as a 

range from Bell et al. (2004) to Levy et al. (2005) to represent the lowest and the highest cobenefits estimates based on these six ozone mortality studies. In addition, we graphically present 

 

91 Since EPA received NAS advice, EPA published the Ozone ISA (U.S. EPA, 2013b) and the second draft Ozone 

Health Risk and Exposure Assessment (U.S. EPA, 2014a). Therefore, the ozone mortality studies applied in this 

analysis, while current at the time of the previous Ozone NAAQS RIAs, do not reflect the most updated 

literature available. The selection of ozone mortality studies used to estimate benefits in RIAs will be revisited in 

the forthcoming RIA accompanying the on-going review of the Ozone NAAQS. 
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estimated co-benefits derived from all six studies mentioned above as a characterization of 

uncertainty regarding the ozone -mortality relationship in Figure 4-1. 

4.3.2 Economic Valuation for Health Co-benefits 

After quantifying the change in adverse health impacts, we estimate the economic value of 

these avoided impacts. Reductions in ambient concentrations of air pollution generally lower the 

risk of future adverse health effects by a small amount for a large population. Therefore, the 

appropriate economic measure is willingness to pay (WTP) for changes in risk of a health effect. 

For some health effects, such as hospital admissions, WTP estimates are generally not available, 

so we use the cost of treating or mitigating the effect. These cost-of-illness (COI) estimates 

generally (although not necessarily in every case) understate the true value of reductions in risk 

of a health effect. They tend to reflect the direct expenditures related to treatment but not the 

value of avoided pain and suffering from the health effect. The unit values applied in this 

analysis are provided in Table 5-9 of the PM NAAQS RIA for each health endpoint (U.S. EPA, 

2012a). 

Avoided premature deaths account for 98 percent of monetized PM-related co-benefits and 

over 90 percent of monetized ozone-related co-benefits. The economics literature concerning the 

appropriate method for valuing reductions in premature mortality risk is still developing. The 

adoption of a value for the projected reduction in the risk of premature mortality is the subject of 

continuing discussion within the economics and public policy analysis community. Following 

the advice of the SAB’s Environmental Economics Advisory Committee (SAB-EEAC), the EPA 

currently uses the value of statistical life (VSL) approach in calculating estimates of mortality 

benefits, because we believe this calculation provides the most reasonable single estimate of an 

individual’s willingness to trade off money for reductions in mortality risk (U.S. EPA-SAB, 

2000). The VSL approach is a summary measure for the value of small changes in mortality risk 

experienced by a large number of people. 

EPA continues work to update its guidance on valuing mortality risk reductions, and the 

Agency consulted several times with the SAB-EEAC on this issue. Until updated guidance is 

available, the Agency determined that a single, peer-reviewed estimate applied consistently, best 

reflects the SAB-EEAC advice it has received. Therefore, EPA has decided to apply the VSL 

that was vetted and endorsed by the SAB in the Guidelines for Preparing Economic Analyses 
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(U.S. EPA, 2000)92 while the Agency continues its efforts to update its guidance on this issue. 

This approach calculates a mean value across VSL estimates derived from 26 labor market and 

contingent valuation studies published between 1974 and 1991. The mean VSL across these 

studies is $6.3 million (2000$).93 We then adjust this VSL to account for the currency year and to 

account for income growth from 1990 to the analysis year. Specifically, the VSLs applied in this 

analysis in 2011$ after adjusting for income growth are $9.9 million for 2020 and $10.1 million 

for 2025 and 2030.94 

The Agency is committed to using scientifically sound, appropriately reviewed evidence in 

valuing mortality risk reductions and has made significant progress in responding to the SABEEAC’s specific recommendations. In the process, the Agency has identified a number of 

important issues to be considered in updating its mortality risk valuation estimates. These are 

detailed in a white paper, “Valuing Mortality Risk Reductions in Environmental Policy” (U.S. 

EPA, 2010c), which recently underwent review by the SAB-EEAC. A meeting with the SAB on 

this paper was held on March 14, 2011 and formal recommendations were transmitted on 

July 29, 2011 (U.S. EPA-SAB, 2011). EPA is taking SAB’s recommendations under advisement. 

In valuing PM2.5-related premature mortality, we discount the value of premature mortality 

occurring in future years using rates of 3 percent and 7 percent (OMB, 2003). We assume that 

there is a “cessation” lag between changes in PM exposures and the total realization of changes 

in health effects. Although the structure of the lag is uncertain, the EPA follows the advice of the 

SAB-HES to assume a segmented lag structure characterized by 30 percent of mortality 

reductions in the first year, 50 percent over years 2 to 5, and 20 percent over the years 6 to 20 

after the reduction in PM2.5 (U.S. EPA-SAB, 2004c). Changes in the cessation lag assumptions 

do not change the total number of estimated deaths but rather the timing of those deaths. Because 

short-term ozone-related premature mortality occurs within the analysis year, the estimated 

ozone-related co-benefits are identical for all discount rates. 

 

92 In the updated Guidelines for Preparing Economic Analyses (U.S. EPA, 2010e), EPA retained the VSL endorsed 

by the SAB with the understanding that further updates to the mortality risk valuation guidance would be 

forthcoming in the near future. 

93 In 1990$, this base VSL is $4.8 million. 

94 Income growth projections are only currently available in BenMAP through 2024, so both the 2025 and 2030 

estimates use income growth only through 2024 and are therefore likely underestimates. 
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4.3.3 Benefit-per-ton Estimates for PM2.5

We used a “benefit-per-ton” approach to estimate the PM2.5 co-benefits in this RIA. EPA 

has applied this approach in several previous RIAs (e.g., U.S. EPA, 2011b, 2011c, 2012b). These 

benefit-per-ton estimates provide the total monetized human health co-benefits (the sum of 

premature mortality and premature morbidity), of reducing one ton of PM2.5 (or PM2.5 precursor 

such as NOX or SO2) from a specified source. Specifically, in this analysis, we multiplied the 

estimates for the EGU sector by the corresponding emission reductions based on regional (i.e., 

East, West, and California) benefit-per-ton estimates. 

The method used to calculate the regional benefit-per-ton estimates is a slight modification 

of the national benefit-per-ton estimates described in the TSD: Estimating the Benefit per Ton of 

Reducing PM2.5 Precursors from 17 Sectors (U.S. EPA, 2013a). The national estimates were 

derived using the approach published in Fann et al. (2012), but they have since been updated to 

reflect the epidemiology studies and Census population data first applied in the final PM 

NAAQS RIA (U.S. EPA, 2012a). The approach in Fann et al. (2012) is similar to the work 

previously published by Fann et al. (2009), but the newer study includes improvements that 

provide more refined estimates of PM2.5-related health benefits for emissions reductions in the 

various sectors. Specifically, the air quality modeling data reflect industrial sectors that are more 

narrowly defined. In addition, the updated air quality modeling data reflects more recent 

emissions data (2005 rather than 2001) and has higher spatial resolution (12km rather than 36 km 

grid cells).95 For this rulemaking, to generate the regional benefit-per-ton estimates we simply 

aggregated the EGU impacts in BenMAP to the region (i.e., East, West, and California) rather 

than aggregating to the nation as was done in Fann et al. (2012). We then divided the regional 

benefits by the regional emissions rather than the national emissions. The appendix to this 

chapter provides additional detail regarding these calculations. 

As noted below in the characterization of uncertainty, all benefit-per-ton estimates have 

inherent limitations. Specifically, all benefit-per-ton estimates reflect the geographic distribution 

of the modeled sector emissions, which may not match the emission reductions anticipated by 

 

95 Although the modeling underlying the benefit-per-ton estimates does not reflect emission reductions anticipated 

from MATS, the EGU contribution to ambient PM2.5 and ozone on a per-ton basis would be similar. (Fann, 

Fulcher, and Baker, 2013) Because the emission reductions in this RIA are calculated from an IPM base case 

that includes MATS (see Chapter 3), there is no double-counting concern with the resulting co-benefits 

estimates. 
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the proposed guidelines, and they may not reflect local variability in population density, 

meteorology, exposure, baseline health incidence rates, or other local factors for any specific 

location. In addition, these estimates reflect the regional average benefit-per-ton for each ambient 

PM2.5 precursor emitted from EGUs, which assumes a linear atmospheric response to emission 

reductions. The regional benefit-per-ton estimates, although less subject to these types of 

uncertainties than national estimates, still should be interpreted with caution. Even though we 

assume that all fine particles have equivalent health effects, the benefit-per-ton estimates vary 

between precursors depending on the location and magnitude of their impact on PM2.5 levels, 

which drive population exposure. 

4.3.4 Benefit-per-ton Estimates for Ozone 

Similar to PM2.5, we used a “benefit-per-ton” approach in this RIA to estimate the ozone 

co-benefits, which represent the total monetized human health co-benefits (the sum of premature 

mortality and premature morbidity) of reducing one ton of NOx (an ozone precursor). Also 

consistent with the PM2.5 estimates, we generated regional benefit-per-ton estimates for ozone for 

the EGU sector using the air quality modeling data described in Fann et al. (2012) and using the 

updated Census population data first applied in the final PM NAAQS RIA (U.S. EPA, 2012a). In 

contrast to the PM2.5 estimates, the ozone estimates are not based on changes to annual 

emissions. Instead, the regional estimates (i.e., East, West, and California) correspond to NOX

emissions from U.S. EGUs during the ozone-season (May to September). Because we estimate 

ozone health impacts from May to September only, this approach underestimates ozone cobenefits in areas with a longer ozone season such as southern California and Texas. These 

estimates assume that EGU-attributable ozone formation at the regional-level is due to NOx 

alone. Because EGUs emit little VOC relative to NOX emissions, it is unlikely that VOCs 

emitted by EGUs would contribute substantially to regional ozone formation. All benefit-per-ton 

estimates have inherent limitations and should be interpreted with caution. We provide more 

detailed information regarding the generation of these estimates in the appendix to this chapter. 

4.3.5 Estimated Health Co-Benefits Results 

Tables 4-7 through 4-9 provide the national and regional benefit-per-ton estimates for 

2020, 2025, and 2030. Tables 4-10 through 4-12 provide the emission reductions estimated to 

occur in three analysis years (2020, 2025, and 2030) for two illustrative compliance scenarios 
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3-25 

(i.e., state and regional) for two options by region (i.e., East, West, and California).96 Tables 4-13 

through 4-15 summarize the national monetized PM and ozone-related health co-benefits 

estimated to occur in three analysis years (2020, 2025, and 2030) for the options by precursor 

pollutant using discount rates of 3 percent and 7 percent. Tables 4-16 through 4-18 provide 

national summaries of the reductions in health incidences estimated for the options associated 

with these pollution reductions in 2020, 2025, and 2030. Figure 4-1 provides a visual 

representation of the range of estimated PM2.5 and ozone-related co-benefits using concentrationresponse functions from different studies and expert opinion for the options evaluated in 2020 as 

an illustrative analysis year. Figures 4-2 and 4-3 provide a breakdown of the monetized health 

co-benefits for each of the options evaluated in 2020 as an illustrative analysis year by precursor 

pollutant and region, respectively. 

Table 4-7. Summary of National and Regional Benefit-per-ton Estimates for EGUs in 2020 

(2011$)* 

Pollutant Discount

Rate National Regional

East West California

SO2

3% $38,000 to $86,000 $40,000 to $90,000 $7,800 to $18,000 $160,000 to $320,000 

7% $34,000 to $77,000 $36,000 to $82,000 $7,100 to $16,000 $140,000 to $320,000 

Directly emitted 

PM2.5 (EC+OC) 

3% $140,000 to $320,000 $140,000 to $320,000 $56,000 to $130,000 $280,000 to $570,000 

7% $130,000 to $290,000 $130,000 to $280,000 $50,000 to $110,000 $250,000 to $570,000 

Directly emitted 

PM2.5 (crustal) 

3% $18,000 to $40,000 $18,000 to $41,000 $11,000 to $25,000 $110,000 to $220,000 

7% $16,000 to $36,000 $16,000 to $37,000 $10,000 to $23,000 $95,000 to $220,000 

NOX (as PM2.5) 3% $5,600 to $13,000 $6,700 to $15,000 $1,200 to $2,600 $17,000 to $34,000 

7% $5,000 to $11,000 $6,000 to $14,000 $1,000 to $2,400 $15,000 to $34,000 

NOX (as Ozone) N/A $3,800 to $16,000 $4,600 to $19,000 $930 to $4,000 $7,400 to $31,000 

* The range of estimates reflects the range of epidemiology studies for avoided premature mortality for PM2.5 and 

ozone. All estimates are rounded to two significant figures. The monetized co-benefits do not include reduced 

health effects from direct exposure to NO2, SO2, ecosystem effects, or visibility impairment. All fine particles are 

assumed to have equivalent health effects, but the benefit per ton estimates vary depending on the location and 

magnitude of their impact on PM2.5 concentrations, which drive population exposure. The monetized co-benefits 

incorporate the conversion from precursor emissions to ambient fine particles and ozone. Benefit-per-ton 

estimates for ozone are based on ozone season NOX emissions. Ozone co-benefits occur in analysis year, so they 

are the same for all discount rates. Confidence intervals are unavailable for this analysis because of the benefitper-ton methodology. In general, the 95th percentile confidence interval for monetized PM2.5 benefits ranges from 

approximately -90 percent to +180 percent of the central estimates based on Krewski et al. (2009) and Lepeule et 

al. (2012). 

 

96 See Chapter 3 of this RIA for more information regarding the expected emission reductions used to calculate the 

health co-benefits in this chapter. Chapter 3 also provides more information regarding the illustrative compliance 

scenarios. 
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Table 4-8. Summary of National and Regional Benefit-per-Ton Estimates for EGUs in 2025 

(2011$)* 

Pollutant Discount

Rate National Regional

East West California

SO2

3% $41,000 to $93,000 $44,000 to $98,000 $8,800 to $20,000 $180,000 to $410,000 

7% $37,000 to $84,000 $39,000 to $89,000 $8,000 to $18,000 $160,000 to $370,000 

Directly emitted 

PM2.5 (EC+OC) 

3% $150,000 to $350,000 $150,000 to $340,000 $64,000 to $140,000 $320,000 to $720,000 

7% $140,000 to $310,000 $140,000 to $310,000 $58,000 to $130,000 $290,000 to $650,000 

Directly emitted 

PM2.5 (crustal) 

3% $17,000 to $39,000 $18,000 to $40,000 $12,000 to $27,000 $43,000 to $96,000 

7% $15,000 to $35,000 $16,000 to $36,000 $11,000 to $24,000 $38,000 to $87,000 

NOX (as PM2.5) 3% $6,000 to $14,000 $7,200 to $16,000 $1,300 to $2,900 $19,000 to $42,000 

7% $5,400 to $12,000 $6,500 to $15,000 $1,200 to $2,600 $17,000 to $38,000 

NOX (as Ozone) N/A $4,900 to $21,000 $5,900 to $25,000 $1,200 to $5,400 $9,900 to $42,000 

* The range of estimates reflects the range of epidemiology studies for avoided premature mortality for PM2.5 and 

ozone. All estimates are rounded to two significant figures. The monetized co-benefits do not include reduced 

health effects from direct exposure to NO2, SO2, ecosystem effects, or visibility impairment. All fine particles are 

assumed to have equivalent health effects, but the benefit per ton estimates vary depending on the location and 

magnitude of their impact on PM2.5 concentrations, which drive population exposure. The monetized co-benefits 

incorporate the conversion from precursor emissions to ambient fine particles and ozone. Benefit-per-ton 

estimates for ozone are based on ozone season NOX emissions. Ozone co-benefits occur in analysis year, so they 

are the same for all discount rates. Confidence intervals are unavailable for this analysis because of the benefitper-ton methodology. In general, the 95th percentile confidence interval for monetized PM2.5 benefits ranges from 

approximately -90 percent to +180 percent of the central estimates based on Krewski et al. (2009) and Lepeule et 

al. (2012).

Table 4-9. Summary of National and Regional Benefit-per-Ton Estimates for EGUs in 2030 

(2011$)* 

Pollutant Discount

Rate National Regional

East West California

SO2

3% $44,000 to $100,000 $47,000 to $110,000 $9,800 to $22,000 $200,000 to $450,000 

7% $40,000 to $90,000 $42,000 to $95,000 $8,800 to $20,000 $180,000 to $410,000 

Directly emitted 

PM2.5 (EC+OC) 

3% $170,000 to $370,000 $160,000 to $370,000 $71,000 to $160,000 $360,000 to $800,000 

7% $150,000 to $340,000 $150,000 to $330,000 $64,000 to $150,000 $320,000 to $730,000 

Directly emitted 

PM2.5 (crustal) 

3% $18,000 to $42,000 $19,000 to $43,000 $13,000 to $30,000 $47,000 to $110,000 

7% $17,000 to $38,000 $17,000 to $38,000 $12,000 to $27,000 $43,000 to $96,000 

NOX (as PM2.5) 3% $6,400 to $14,000 $7,600 to $17,000 $1,400 to $3,200 $21,000 to $42,000 

7% $5,800 to $13,000 $6,900 to $16,000 $1,300 to $2,900 $19,000 to $47,000 

NOX (as Ozone) N/A $5,300 to $23,000 $6,300 to $27,000 $1,400 to $6,000 $11,000 to $47,000 

* The range of estimates reflects the range of epidemiology studies for avoided premature mortality for PM2.5 and 

ozone. All estimates are rounded to two significant figures. The monetized co-benefits do not include reduced 

health effects from direct exposure to NO2, SO2, ecosystem effects, or visibility impairment. All fine particles are 

assumed to have equivalent health effects, but the benefit per ton estimates vary depending on the location and 

magnitude of their impact on PM2.5 concentrations, which drive population exposure. The monetized co-benefits 

incorporate the conversion from precursor emissions to ambient fine particles and ozone. Benefit-per-ton 

estimates for ozone are based on ozone season NOX emissions. Ozone co-benefits occur in analysis year, so they 

are the same for all discount rates. Confidence intervals are unavailable for this analysis because of the benefitper-ton methodology. In general, the 95th percentile confidence interval for monetized PM2.5 benefits ranges from 

approximately -90 percent to +180 percent of the central estimates based on Krewski et al. (2009) and Lepeule et 

al. (2012). 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

3-27 

Table 4-10. Emission Reductions of Criteria Pollutants for the Proposed EGU GHG 

Existing Source Guidelines in 2020 (thousands of short tons)* 

Region SO2 All-year NOx Ozone-Season 

NOx 

Directly emitted 

PM2.5 (EC+OC) 

Directly emitted 

PM2.5 (crustal) 

Option 1 - State 

East 311 315 135 5 41 

West 25 51 22 <1 4 

California <1 1 1 N/A N/A 

National Total 335 367 157 6 45 

Option 1 - Regional 

East 279 305 130 5 41 

West 10 32 13 0 3 

California 2 8 3 N/A N/A 

National Total 292 345 146 6 44 

Option 2 - State 

East 247 240 101 4 35 

West 20 40 18 <1 3 

California <1 1 1 N/A N/A 

National Total 267 281 119 5 38 

Option 2 - Regional 

East 234 235 97 4 33 

West 8 25 11 <1 2 

California 2 8 3 N/A N/A 

National Total 244 268 111 5 36 

*All emissions shown in the table are rounded, so regional emission reductions may appear to not sum to 

national total.
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

3-28 

Table 4-11. Emission Reductions of Criteria Pollutants for the Proposed EGU 

GHG Existing Source Guidelines in 2025 (thousands of short tons)* 

Region SO2

All-year 

NOx 

Ozone-Season 

NOx 

Directly emitted 

PM2.5 (EC+OC) 

Directly emitted 

PM2.5 (crustal) 

Option 1 - State 

East 395 378 164 6 44 

West 30 53 23 1 6 

California 1 5 2 N/A N/A 

National Total 425 436 190 6 49 

Option 1 - Regional 

East 376 372 160 5 42 

West 16 34 15 1 4 

California 3 16 5 N/A N/A 

National Total 395 421 180 6 46 

Option 2 - State 

East 301 271 114 4 34 

West 25 42 20 <1 4 

California 1 4 2 N/A N/A 

National Total 327 317 136 5 38 

Option 2 - Regional 

East 281 270 113 4 32 

West 13 24 11 <1 3 

California 3 14 5 N/A N/A 

National Total 297 309 129 4 34 

 *All emissions shown in the table are rounded, so regional emission reductions may appear to not sum to national 

total. 

 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

3-29 

Table 4-12. Emission Reductions of Criteria Pollutants for the Proposed EGU GHG 

Existing Source Guidelines in 2030 (thousands of short tons)* 

Region SO2 All-year NOx Ozone-Season 

NOx 

Directly emitted 

PM2.5 (EC+OC)* 

Directly emitted 

PM2.5 (crustal)* 

Option 1 - State 

East 441 376 163 5 39 

West 30 52 24 1 5 

California <1 <1 <1 N/A N/A 

National Total 471 428 187 6 44 

Option 1 - Regional 

East 406 366 158 5 39 

West 16 33 15 <1 4 

California 2 7 3 N/A N/A 

National Total 424 407 176 5 42 

Option 2 - State 

East 299 238 104 4 31 

West 22 36 16 <1 3 

California <1 <1 0 N/A N/A 

National Total 321 274 120 4 34 

Option 2 - Regional 

East 275 227 98 4 29 

West 11 20 9 <1 2 

California 1 4 3 N/A N/A 

National Total 287 252 110 4 31 

 *All emissions shown in the table are rounded, so regional emission reductions may appear to not sum to national 

total.
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

3-30 

Table 4-13. Summary of Estimated Monetized Health Co-Benefits for the Proposed EGU 

GHG Existing Source Guidelines in 2020 (millions of 2011$) * 

Pollutant 3% Discount Rate 7% Discount Rate 

Option 1 - State 

SO2 $13,000 to $29,000 $11,000 to $26,000 

Directly emitted PM2.5 (EC+OC) $760 to $1,700 $690 to $1,600 

Directly emitted PM2.5 (crustal) $790 to $1,800 $710 to $1,600 

NOx (as PM2.5) $2,200 to $4,900 $2,000 to $4,400 

NOx (as Ozone) $640 to $2,700 $640 to $2,700 

Total $17,000 to $40,000 $15,000 to $36,000

Option 1 - Regional 

SO2 $12,000 to $26,000 $11,000 to $24,000 

Directly emitted PM2.5 (EC+OC) $750 to $1,700 $670 to $1,500 

Directly emitted PM2.5 (crustal) $770 to $1,700 $690 to $1,600 

NOx (as PM2.5) $2,200 to $5,000 $2,000 to $4,500 

NOx (as Ozone) $630 to $2,700 $630 to $2,700 

Total $16,000 to $37,000 $15,000 to $34,000

Option 2 - State 

SO2 $10,000 to $23,000 $9,100 to $21,000 

Directly emitted PM2.5 (EC+OC) $640 to $1,500 $580 to $1,300 

Directly emitted PM2.5 (crustal) $660 to $1,500 $600 to $1,400 

NOx (as PM2.5) $1,700 to $3,800 $1,500 to $3,400 

NOx (as Ozone) $480 to $2,100 $480 to $2,100 

Total $14,000 to $32,000 $12,000 to $29,000

Option 2 - Regional 

SO2 $9,800 to $22,000 $8,900 to $20,000 

Directly emitted PM2.5 (EC+OC) $610 to $1,400 $550 to $1,200 

Directly emitted PM2.5 (crustal) $630 to $1,400 $570 to $1,300 

NOx (as PM2.5) $1,700 to $3,900 $1,600 to $3,500 

NOx (as Ozone) $470 to $2,000 $470 to $2,000 

Total $13,000 to $31,000 $12,000 to $28,000

* All estimates are rounded to two significant figures so numbers may not sum down columns. The estimated 

monetized co-benefits do not include climate benefits or reduced health effects from direct exposure to NO2, SO2, 

ecosystem effects, or visibility impairment. All fine particles are assumed to have equivalent health effects, but the 

benefit-per-ton estimates vary depending on the location and magnitude of their impact on PM2.5 levels, which 

drive population exposure. The monetized co-benefits incorporate the conversion from precursor emissions to 

ambient fine particles and ozone. Co-benefits for PM2.5 precursors are based on regional benefit-per-ton estimates. 

Co-benefits for ozone are based on ozone season NOx emissions. Ozone co-benefits occur in analysis year, so they 

are the same for all discount rates. Confidence intervals are unavailable for this analysis because of the benefit-perton methodology. In general, the 95th percentile confidence interval for monetized PM2.5 benefits ranges from 

approximately -90 percent to +180 percent of the central estimates based on Krewski et al. (2009) and Lepeule et 

al. (2012). 

Comment [A77]: OMB comment: Given 

projected PM emissions post MATS (and now 

CSAPR) for the US, including the transportation 

sector, how many tons (and thus, benefits) remain to 

be mitigated? Does EPA have any sense of the cost 

reduction curves associated with those remaining 

tons? 

EPA response: In Table 3-4 of this RIA, we provide 

the estimated tons of criteria pollutant emissions in 

the IPM base case and remaining after 

implementation of the proposed guidelines. Cost 

curves are associated with the remaining criteria 

pollutant tons are not relevant to the co-benefits 

analysis or the proposed guidelines. 

OMB reply: It is still worth giving some context to 

these reductions, relative to NAAQS goals. 

EPA response: We do not have the information to 

provide additional context relative to the NAAQS 

beyond the sentence in section 4.3 that says: 

“Implementing these guidelines may lead to 

reductions in ambient PM2.5 concentrations below the 

National Ambient Air Quality Standards (NAAQS) 

for PM and ozone in some areas and assist other 

areas with attaining these NAAQS”. We have not 

conducted air quality modeling for this RIA, and a 

NAAQS analysis is beyond the scope of this RIA. 

Furthermore, this is an illustrative analysis of what 

states may choose to do for one sector. 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

3-31 

Table 4-14. Summary of Estimated Monetized Health Co-Benefits for the Proposed EGU 

GHG Existing Source Guidelines in 2025 (millions of 2011$) * 

Pollutant 3% Discount Rate 7% Discount Rate 

Option 1 - State 

SO2 $18,000 to $40,000 $16,000 to $36,000 

Directly emitted PM2.5 (EC+OC) $900 to $2,000 $810 to $1,800 

Directly emitted PM2.5 (crustal) $830 to $1,900 $750 to $1,700 

NOx (as PM2.5) $2,900 to $6,500 $2,600 to $5,800 

NOx (as Ozone) $1,000 to $4,400 $1,000 to $4,400 

Total $23,000 to $54,000 $21,000 to $49,000

Option 1 - Regional 

SO2 $17,000 to $38,000 $15,000 to $35,000 

Directly emitted PM2.5 (EC+OC) $850 to $1,900 $760 to $1,700 

Directly emitted PM2.5 (crustal) $780 to $1,800 $700 to $1,600 

NOx (as PM2.5) $3,000 to $6,800 $2,700 to $6,100 

NOx (as Ozone) $1,000 to $4,300 $1,000 to $4,300 

Total $23,000 to $53,000 $21,000 to $48,000

Option 2 - State 

SO2 $14,000 to $30,000 $12,000 to $27,000 

Directly emitted PM2.5 (EC+OC) $690 to $1,600 $630 to $1,400 

Directly emitted PM2.5 (crustal) $640 to $1,400 $580 to $1,300 

NOx (as PM2.5) $2,100 to $4,700 $1,900 to $4,200 

NOx (as Ozone) $720 to $3,100 $720 to $3,100 

Total $18,000 to $41,000 $16,000 to $37,000 

Option 2 - Regional 

SO2 $13,000 to $29,000 $12,000 to $26,000 

Directly emitted PM2.5 (EC+OC) $640 to $1,400 $580 to $1,300 

Directly emitted PM2.5 (crustal) $590 to $1,300 $530 to $1,200 

NOx (as PM2.5) $2,200 to $5,000 $2,000 to $4,500 

NOx (as Ozone) $730 to $3,100 $730 to $3,100 

Total $17,000 to $40,000 $16,000 to $36,000 

* All estimates are rounded to two significant figures so numbers may not sum down columns. The estimated 

monetized co-benefits do not include climate benefits or reduced health effects from direct exposure to NO2, SO2, 

ecosystem effects, or visibility impairment. All fine particles are assumed to have equivalent health effects, but the 

benefit-per-ton estimates vary depending on the location and magnitude of their impact on PM2.5 levels, which 

drive population exposure. The monetized co-benefits incorporate the conversion from precursor emissions to 

ambient fine particles and ozone. Co-benefits for PM2.5 precursors are based on regional benefit-per-ton estimates. 

Co-benefits for ozone are based on ozone season NOx emissions. Ozone co-benefits occur in analysis year, so they 

are the same for all discount rates. Confidence intervals are unavailable for this analysis because of the benefit-perton methodology. In general, the 95th percentile confidence interval for monetized PM2.5 benefits ranges from 

approximately -90 percent to +180 percent of the central estimates based on Krewski et al. (2009) and Lepeule et 

al. (2012). 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

3-32 

Table 4-15. Summary of Estimated Monetized Health Co-Benefits for the Proposed EGU 

GHG Existing Source Guidelines in 2030 (millions of 2011$) * 

Pollutant 3% Discount Rate 7% Discount Rate 

Option 1 - State 

SO2 $21,000 to $47,000 $19,000 to $43,000 

Directly emitted PM2.5 (EC+OC) $870 to $2,000 $780 to $1,800 

Directly emitted PM2.5 (crustal) $800 to $1,800 $720 to $1,600 

NOx (as PM2.5) $2,900 to $6,600 $2,600 to $6,000 

NOx (as Ozone) $1,100 to $4,600 $1,100 to $4,600 

Total $27,000 to $62,000 $24,000 to $57,000

Option 1 - Regional 

SO2 $20,000 to $44,000 $18,000 to $40,000 

Directly emitted PM2.5 (EC+OC) $840 to $1,900 $760 to $1,700 

Directly emitted PM2.5 (crustal) $770 to $1,700 $700 to $1,600 

NOx (as PM2.5) $3,000 to $6,700 $2,700 to $6,100 

NOx (as Ozone) $1,100 to $4,500 $1,100 to $4,500 

Total $25,000 to $59,000 $23,000 to $54,000

Option 2 - State 

SO2 $14,000 to $32,000 $13,000 to $29,000

Directly emitted PM2.5 (EC+OC) $680 to $1,500 $610 to $1,400

Directly emitted PM2.5 (crustal) $620 to $1,400 $560 to $1,300

NOx (as PM2.5) $1,900 to $4,200 $1,700 to $3,800

NOx (as Ozone) $680 to $2,900 $680 to $2,900

Total $18,000 to $42,000 $16,000 to $38,000 

Option 2 - Regional 

SO2 $13,000 to $30,000 $12,000 to $27,000

Directly emitted PM2.5 (EC+OC) $630 to $1,400 $570 to $1,300

Directly emitted PM2.5 (crustal) $580 to $1,300 $520 to $1,200

NOx (as PM2.5) $1,800 to $4,200 $1,700 to $3,800

NOx (as Ozone) $660 to $2,800 $660 to $2,800

Total $17,000 to $40,000 $15,000 to $36,000 

* All estimates are rounded to two significant figures so numbers may not sum down columns. The estimated 

monetized co-benefits do not include climate benefits or reduced health effects from direct exposure to NO2, SO2, 

ecosystem effects, or visibility impairment. All fine particles are assumed to have equivalent health effects, but the 

benefit-per-ton estimates vary depending on the location and magnitude of their impact on PM2.5 levels, which 

drive population exposure. The monetized co-benefits incorporate the conversion from precursor emissions to 

ambient fine particles and ozone. Co-benefits for PM2.5 precursors are based on regional benefit-per-ton estimates. 

Co-benefits for ozone are based on ozone season NOx emissions. Ozone co-benefits occur in analysis year, so they 

are the same for all discount rates. Confidence intervals are unavailable for this analysis because of the benefit-perton methodology. In general, the 95th percentile confidence interval for monetized PM2.5 benefits ranges from 

approximately -90 percent to +180 percent of the central estimates based on Krewski et al. (2009) and Lepeule et 

al. (2012). 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

3-33 

Table 4-16. Summary of Avoided Health Incidences from PM2.5-Related and OzoneRelated Co-benefits for Proposed EGU GHG Existing Source Guidelines in 

2020* 

Option 1 - 

state 

Option 1 - 

regional 

Option 2 - 

state 

Option 2 - 

regional 

PM2.5-related Health Incidences 

Avoided Premature Mortality 

Krewski et al. (2009) (adult) 1,800 1,700 1,400 1,400 

Lepeule et al. (2012) (adult) 4,100 3,800 3,200 3,200 

Woodruff et al. (1997) (infant) 4 4 3 3 

Avoided Morbidity 

Emergency department visits for asthma (all ages) 950 890 760 740 

Acute bronchitis (age 8–12) 2,600 2,500 2,100 2,000 

Lower respiratory symptoms (age 7–14) 33,000 31,000 27,000 26,000 

Upper respiratory symptoms (asthmatics age 9–11) 48,000 45,000 38,000 38,000 

Minor restricted-activity days (age 18–65) 1,300,000 1,200,000 1,000,000 1,000,000 

Lost work days (age 18–65) 220,000 210,000 180,000 170,000 

Asthma exacerbation (age 6–18) 100,000 95,000 82,000 80,000 

Hospital admissions—respiratory (all ages) 530 490 420 410 

Hospital admissions—cardiovascular (age > 18) 650 610 520 500 

Non-Fatal Heart Attacks (age >18) 

Peters et al. (2001) 2,100 1,900 1,600 1,600 

Pooled estimate of 4 studies 220 210 180 170 

Ozone-related Health Incidences 

Avoided Premature Mortality 

Bell et al. (2004) (all ages) 36 35 27 27 

Levy et al. (2005) (all ages) 170 160 120 120 

Avoided Morbidity 

Hospital admissions—respiratory causes (ages > 65) 220 210 160 160 

Hospital admissions—respiratory causes (ages < 2) 100 98 76 74 

Emergency room visits for asthma (all ages) 120 110 89 87 

Minor restricted-activity days (ages 18-65) 210,000 210,000 160,000 160,000 

School absence days 72,000 71,000 55,000 54,000 

* All estimates are rounded to whole numbers with two significant figures. Co-benefits for PM2.5 precursors are 

based on regional benefit-per-ton estimates for all precursors. Co-benefits for ozone are based on ozone season NOx 

emissions. Confidence intervals are unavailable for this analysis because of the benefit-per-ton methodology. In 

general, the 95th percentile confidence interval for the health impact function alone ranges from approximately ±30 

percent for mortality incidence based on Krewski et al. (2009) and ±46 percent based on Lepeule et al. (2012). 

Deleted: Related 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

3-34 

Table 4-17. Summary of Avoided Health Incidences from PM2.5-Related and OzoneRelated Co-benefits for Proposed EGU GHG Existing Source Guidelines in 

2025* 

Option 1 - 

state 

Option 1 - 

regional 

Option 2 - 

state 

Option 2 - 

regional 

PM2.5-related Health Incidences 

Avoided Premature Mortality 

Krewski et al. (2009) (adult) 2,400 2,300 1,800 1,800 

Lepeule et al. (2012) (adult) 5,400 5,300 4,100 4,000 

Woodruff et al. (1997) (infant) 5 5 4 4 

Avoided Morbidity 

Emergency department visits for asthma (all ages) 1,200 1,200 930 900 

Acute bronchitis (age 8–12) 3,400 3,300 2,600 2,500 

Lower respiratory symptoms (age 7–14) 43,000 43,000 33,000 32,000 

Upper respiratory symptoms (asthmatics age 9–11) 63,000 62,000 48,000 46,000 

Minor restricted-activity days (age 18–65) 1,700,000 1,600,000 1,300,000 1,200,000 

Lost work days (age 18–65) 280,000 280,000 210,000 210,000 

Asthma exacerbation (age 6–18) 130,000 130,000 100,000 100,000 

Hospital admissions—respiratory (all ages) 730 710 560 540 

Hospital admissions—cardiovascular (age > 18) 890 870 680 650 

Non-Fatal Heart Attacks (age >18) 

Peters et al. (2001) 2,800 2,700 2,100 2,100 

Pooled estimate of 4 studies 310 300 230 220 

Ozone-related Health Incidences 

Avoided Premature Mortality 

Bell et al. (2004) (all ages) 93 92 65 66 

Levy et al. (2005) (all ages) 420 420 300 300 

Avoided Morbidity 

Hospital admissions—respiratory causes (ages > 65) 600 600 430 430 

Hospital admissions—respiratory causes (ages < 2) 250 240 180 180 

Emergency room visits for asthma (all ages) 290 290 210 210 

Minor restricted-activity days (ages 18-65) 520,000 520,000 370,000 370,000 

School absence days 180,000 180,000 130,000 130,000 

* All estimates are rounded to whole numbers with two significant figures. Co-benefits for PM2.5 precursors are 

based on regional benefit-per-ton estimates for all precursors. Co-benefits for ozone are based on ozone season NOx 

emissions. In general, the 95th percentile confidence interval for the health impact function alone ranges from 

approximately ±30 percent for mortality incidence based on Krewski et al. (2009) and ±46 percent based on Lepeule 

et al. (2012). 

Deleted: Related 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

3-35 

Table 4-18. Summary of Avoided Health Incidences from PM2.5-Related and OzoneRelated Co-Benefits for Proposed EGU GHG Existing Source Guidelines in 

2030* 

Option 1 - 

state 

Option 1 - 

regional 

Option 2 - 

state 

Option 2 - 

regional 

PM2.5-related Health Incidences 

Avoided Premature Mortality 

Krewski et al. (2009) (adult) 2,700 2,600 1,900 1,800 

Lepeule et al. (2012) (adult) 6,200 5,900 4,200 4,000 

Woodruff et al. (1997) (infant) 5 5 3 4 

Avoided Morbidity 

Emergency department visits for asthma (all ages) 1,400 1,300 930 900 

Acute bronchitis (age 8–12) 3,700 3,500 2,500 2,500 

Lower respiratory symptoms (age 7–14) 48,000 45,000 33,000 32,000 

Upper respiratory symptoms (asthmatics age 9–11) 69,000 66,000 47,000 46,000 

Minor restricted-activity days (age 18–65) 1,800,000 1,700,000 1,200,000 1,200,000 

Lost work days (age 18–65) 310,000 290,000 210,000 210,000 

Asthma exacerbation (age 6–18) 150,000 140,000 100,000 100,000 

Hospital admissions—respiratory (all ages) 870 820 590 540 

Hospital admissions—cardiovascular (age > 18) 1,000 980 710 650 

Non-Fatal Heart Attacks (age >18) 

Peters et al. (2001) 3,300 3,100 2,200 2,100 

Pooled estimate of 4 studies 360 340 240 220 

Ozone-related Health Incidences 

Avoided Premature Mortality 

Bell et al. (2004) (all ages) 97 96 62 60 

Levy et al. (2005) (all ages) 440 430 280 270 

Avoided Morbidity 

Hospital admissions—respiratory causes (ages > 65) 670 660 430 410 

Hospital admissions—respiratory causes (ages < 2) 250 240 160 150 

Emergency room visits for asthma (all ages) 290 290 190 180 

Minor restricted-activity days (ages 18-65) 510,000 510,000 330,000 320,000 

School absence days 180,000 180,000 120,000 110,000 

* All estimates are rounded to whole numbers with two significant figures. Co-benefits for PM2.5 precursors are 

based on regional benefit-per-ton estimates for all precursors. Co-benefits for ozone are based on ozone season NOx 

emissions. In general, the 95th percentile confidence interval for the health impact function alone ranges from 

approximately ±30 percent for mortality incidence based on Krewski et al. (2009) and ±46 percent based on Lepeule 

et al. (2012). 

 

Deleted: Related 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

3-36 

Figure 4-1. Monetized Health Co-benefits for each Option (Regional Compliance) of the 

Proposed EGU GHG Existing Source Guidelines in 2020 * 

*The PM2.5 graphs show the estimated PM2.5 co-benefits at discount rates of 3% and 7% using effect coefficients 

derived from the Krewski et al. (2009) study and the Lepeule et al. (2012) study, as well as 12 effect coefficients 

derived from EPA’s expert elicitation on PM mortality (Roman et al., 2008). The results shown are not the direct 

results from the studies or expert elicitation; rather, the estimates are based in part on the concentration-response 

functions provided in those studies. The ozone graphs show the estimated ozone co-benefits derived from six ozone 

mortality studies (i.e., Bell et al. (2004), Schwartz (2005), Huang et al. (2005), Bell et al. (2005), Levy et al. (2005), 

and Ito et al. (2005). Ozone co-benefits occur in the analysis year, so they are the same for all discount rates. These 

estimates do not include climate benefits. The monetized co-benefits do not include climate benefits or reduced 

health effects from direct exposure to NO2, SO2, ecosystem effects, or visibility impairment. Results would be 

similar if the state compliance scenario was shown.

PM2.5       Ozone
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

3-37 

Figure 4-2. Breakdown of Monetized Health Co-benefits by Precursor Pollutant at a 3% 

Discount Rate for each Option (Regional Compliance) for Proposed EGU GHG 

Existing Source Guidelines in 2020* 

* “Low Health Co-benefits” refers to the combined health co-benefits estimated using the Bell et al. (2004) 

mortality study for ozone with the Krewski et al. (2009) mortality study for PM2.5. “High Health Co-benefits” refers 

to the combined health co-benefits estimated using the Levy et al. (2005) mortality study for ozone with the Lepeule 

et al. (2012) mortality study for PM2.5. Results would be similar if the state compliance scenario was shown.

 

SO2 73%

Directly

emitted

PM2.5

(EC+OC) 4%

Directly

emitted

PM2.5

(Crustal)

5%

NOx (as

PM2.5)

14%

NOx (as

Ozone)

4%

Option 1 ‐ Regional

SO2 70%

Directly

emitted

PM2.5

(EC+OC) 5%

Directly

emitted

PM2.5

(Crustal)

5%

NOx (as

PM2.5)

13%

NOx (as

Ozone)

7%

Option 1 ‐ Regional

SO2 74%

Directly

emitted

PM2.5

(EC+OC)

5%

Directly

emitted

PM2.5

(Crustal)

5%

NOx (as

PM2.5)

13%

NOx (as

Ozone)

3%

Option 2 ‐ Regional

SO2 72%

Directly

emitted

PM2.5

(EC+OC) 4%

Directly

emitted

PM2.5

(Crustal)

5%

NOx (as

PM2.5)

13%

NOx (as

Ozone)

6%

Option 2 ‐ Regional

Low Health Co‐benefits    High Health Co‐benefits
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

3-38 

Figure 4-3. Breakdown of Monetized Health Co-Benefits by Region at a 3% Discount Rate 

for each Option (Regional compliance) for Proposed EGU GHG Existing Source 

Guidelines in 2020* 

* “Low Health Co-benefits” refers to the combined health co-benefits estimated using the Bell et al. (2004) 

mortality study for ozone with the Krewski et al. (2009) mortality study for PM2.5. “High Health Co-benefits” refers 

to the combined health co-benefits estimated using the Levy et al. (2005) mortality study for ozone with the Lepeule 

et al. (2012) mortality study for PM2.5. Results would be similar if the state compliance scenario was shown.

4.3.6 Characterization of Uncertainty in the Estimated Health Co-benefits 

In any complex analysis using estimated parameters and inputs from numerous models, 

there are likely to be many sources of uncertainty. This analysis is no exception. This analysis 

includes many data sources as inputs, including emission inventories, air quality data from 

models (with their associated parameters and inputs), population data, population estimates, 

East 95.6%

West

1.1%

California

3.3%

Option 1 ‐ Regional

East 95.5%

West 1.2%

California

3.3%

Option 1 ‐ Regional

East 95.1%

West

1.1%

California

3.8%

Option 2 ‐ Regional

East 95.0%

West 1.1%

California

3.9%

Option 2 ‐ Regional

Low Health Co‐benefits    High Health Co‐benefits
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3-39 

health effect estimates from epidemiology studies, economic data for monetizing co-benefits, 

and assumptions regarding the future state of the world (i.e., regulations, technology, and human 

behavior). Each of these inputs may be uncertain and would affect the estimate of co-benefits. 

When the uncertainties from each stage of the analysis are compounded, even small uncertainties 

can have large effects on the total quantified benefits. Therefore, the estimates of co-benefits in 

each analysis year should be viewed as representative of the general magnitude of co-benefits of 

the illustrative compliance scenarios, rather than the actual co-benefits anticipated from 

implementing the proposed guidelines. 

This RIA does not include the type of detailed uncertainty assessment found in the PM 

NAAQS RIA (U.S. EPA, 2012a) or the Ozone NAAQS RIA (U.S. EPA, 2008b) because we lack 

the necessary air quality modeling input and/or monitoring data to run the benefits model. 

However, the results of the quantitative and qualitative uncertainty analyses presented in the PM 

NAAQS RIA and Ozone NAAQS RIAs can provide some information regarding the uncertainty 

inherent in the estimated co-benefits results presented in this analysis. For example, sensitivity 

analyses conducted for the PM NAAQS RIA indicate that alternate cessation lag assumptions 

could change the estimated PM2.5-related mortality co-benefits discounted at 3 percent by 

between 10 percent and –27 percent and that alternate income growth adjustments could change 

the PM2.5-related mortality co-benefits by between 33 percent and −14 percent. Although we 

generally do not calculate confidence intervals for benefit-per-ton estimates and they can provide 

an incomplete picture about the overall uncertainty in the benefits estimates, the PM NAAQS RIA 

can provide an indication of the random sampling error in the health impact and economic 

valuation functions using Monte Carlo methods. In general, the 95th percentile confidence interval 

for monetized PM2.5 benefits ranges from approximately -90 percent to +180 percent of the 

central estimates based on Krewski et al. (2009) and Lepeule et al. (2012). The 95th percentile 

confidence interval for the health impact function alone ranges from approximately ±30 percent for 

mortality incidence based on Krewski et al. (2009) and ±46 percent based on Lepeule et al. (2012). 

Unlike RIAs for which EPA conducts air quality modeling, we do not have information on 

the specific location of the air quality changes associated with the proposed guidelines. As such, 

it is not feasible to estimate the proportion of co-benefits occurring in different locations, such as 

designated nonattainment areas. Instead, we applied benefit-per-ton estimates, which reflect 

specific geographic patterns of emissions reductions and specific air quality and benefits 
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3-40 

modeling assumptions. For example, these estimates may not reflect local variability in 

population density, meteorology, exposure, baseline health incidence rates, or other local factors 

that might lead to an over-estimate or under-estimate of the actual co-benefits of controlling PM 

and ozone precursors. Use of these benefit-per-ton values to estimate co-benefits may lead to 

higher or lower benefit estimates than if co-benefits were calculated based on direct air quality 

modeling. Great care should be taken in applying these estimates to emission reductions 

occurring in any specific location, as these are all based on broad emission reduction scenarios 

and therefore represent average benefits-per-ton over the entire region. The benefit-per-ton for 

emission reductions in specific locations may be very different than the estimates presented here. 

To the extent that the geographic distribution of the emissions reductions achieved by 

implementing the proposed guidelines is different than the emissions in the sector modeling, the 

co-benefits may be underestimated or overestimated. For more information regarding the 

limitations of benefit-per-ton estimates derived from the sector modeling, see the TSD describing 

the calculation of the national benefit-per-ton estimates (U.S. EPA, 2013a) and Fann et al. 

(2012). In addition, the appendix to this chapter provides additional uncertainty information 

regarding the benefit-per-ton estimates applied in this RIA, including an evaluation of the 

similarities and differences in the spatial distribution of EGU emissions in the sector modeling 

and the IPM base case discussed in Chapter 3 of this RIA. 

Our estimate of the total monetized co-benefits is based on EPA’s interpretation of the best 

available scientific literature and methods and supported by the SAB-HES and the National 

Academies of Science (NRC, 2002). Below are key assumptions underlying the estimates for 

PM2.5-related premature mortality, which accounts for 98 percent of the monetized PM2.5 health 

co-benefits. 

4. We assume that all fine particles, regardless of their chemical composition, are 

equally potent in causing premature mortality. This is an important assumption, 

because PM2.5 varies considerably in composition across sources, but the scientific 

evidence is not yet sufficient to allow differentiation of effect estimates by particle 

type. The PM ISA concluded that “many constituents of PM2.5 can be linked with 

multiple health effects, and the evidence is not yet sufficient to allow differentiation 

of those constituents or sources that are more closely related to specific outcomes” 

(U.S. EPA, 2009b). 
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3-41 

5. We assume that the health impact function for fine particles is log-linear without a 

threshold in this analysis. Thus, the estimates include health co-benefits from 

reducing fine particles in areas with varied concentrations of PM2.5, including both 

areas that do not meet the fine particle standard and those areas that are in attainment, 

down to the lowest modeled concentrations. 

6. We assume that there is a “cessation” lag between the change in PM exposures and 

the total realization of changes in mortality effects. Specifically, we assume that some 

of the incidences of premature mortality related to PM2.5 exposures occur in a 

distributed fashion over the 20 years following exposure based on the advice of the 

SAB-HES (U.S. EPA-SAB, 2004c), which affects the valuation of mortality cobenefits at different discount rates. 

In general, we are more confident in the magnitude of the risks we estimate from simulated 

PM2.5 concentrations that coincide with the bulk of the observed PM concentrations in the 

epidemiological studies that are used to estimate the benefits. Likewise, we are less confident in 

the risk we estimate from simulated PM2.5 concentrations that fall below the bulk of the observed 

data in these studies. Concentration benchmark analyses (e.g., lowest measured level [LML], one 

standard deviation below the mean of the air quality data in the study, etc.) allow readers to 

determine the portion of population exposed to annual mean PM2.5 levels at or above different 

concentrations, which provides some insight into the level of uncertainty in the estimated PM2.5 

mortality benefits. In this analysis, we apply two concentration benchmark approaches (LML and 

one standard deviation below the mean) that have been incorporated into recent RIAs and EPA’s 

Policy Assessment for Particulate Matter (U.S. EPA, 2011d). There are uncertainties inherent in 

identifying any particular point at which our confidence in reported associations becomes 

appreciably less, and the scientific evidence provides no clear dividing line. However, the EPA 

does not view these concentration benchmarks as a concentration threshold below which we 

would not quantify health co-benefits of air quality improvements.97 Rather, the co-benefits 

estimates reported in this RIA are the best estimates because they reflect the full range of air 

quality concentrations associated with the emission reduction strategies. The PM ISA concluded 

that the scientific evidence collectively is sufficient to conclude that the relationship between 

 

97 For a summary of the scientific review statements regarding the lack of a threshold in the PM2.5-mortality 

relationship, see the TSD entitled Summary of Expert Opinions on the Existence of a Threshold in the 

Concentration-Response Function for PM2.5-related Mortality (U.S. EPA, 2010b). 
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3-42 

long-term PM2.5 exposures and mortality is causal and that overall the studies support the use of a 

no-threshold log-linear model to estimate PM-related long-term mortality (U.S. EPA, 2009b). 

For this analysis, policy-specific air quality data is not available, and the compliance 

strategies are illustrative of what states may choose to do. For this RIA, we are unable to 

estimate the percentage of premature mortality associated with the emission reductions at each 

PM2.5 concentration, as we have done for previous rules with air quality modeling (e.g., U.S. 

EPA, 2011b, 2012a). However, we believe that it is still important to characterize the distribution 

of exposure to baseline concentrations. As a surrogate measure of mortality impacts, we provide 

the percentage of the population exposed at each PM2.5 concentration in the baseline of the 

source apportionment modeling used to calculate the benefit-per-ton estimates for this sector

using 12 km grid cells across the contiguous U.S.

98 It is important to note that baseline exposure 

is only one parameter in the health impact function, along with baseline incidence rates 

population and change in air quality. In other words, the percentage of the population exposed to 

air pollution below the LML is not the same as the percentage of the population experiencing 

health impacts as a result of a specific emission reduction policy. The most important aspect, 

which we are unable to quantify without rule-specific air quality modeling, is the shift in 

exposure anticipated by implementing the proposed guidelines. Therefore, caution is warranted 

when interpreting the LML assessment in this RIA because these results are not consistent with 

results from RIAs that had air quality modeling. 

Table 4-19 provides the percentage of the population exposed above and below two 

concentration benchmarks (i.e., LML and one standard deviation below the mean) in the 

modeled baseline for the sector modeling. Figure 4-4 shows a bar chart of the percentage of the 

population exposed to various air quality levels in the baseline, and Figure 4-5 shows a 

cumulative distribution function of the same data. Both figures identify the LML for each of the 

major cohort studies. 

 

98 As noted above, the modeling used to generate the benefit-per-ton estimates does not reflect emission reductions 

anticipated from MATS rule. Therefore, the baseline PM2.5 concentrations in the LML assessment are higher than 

would be expected if MATS was reflected. 

Deleted: level 

Comment [A78]: OMB comment: The references 

the vacatur of CSAPR rule and should be updated to 

reflect recent SCOTUS decision. As written, this 

suggests that it doesn’t include the DC Circuit’s 

CSAPR decision. Does this mean that CSAPR is 

part of the analysis? EPA should clarify the footnote. 

EPA response: The footnote was revised in a 

previous iteration to address this comment. 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

3-43 

Table 4-19. Population Exposure in the Baseline Sector Modeling (used to generate the 

benefit-per-ton estimates) Above and Below Various Concentrations 

Benchmarks in the Underlying Epidemiology Studies * 

Epidemiology Study 

Below 1 Standard 

Deviation. 

Below AQ Mean 

At or Above 1 Standard 

Deviation Below AQ 

Mean 

Below LML At or Above LML 

Krewski et al. (2009) 89% 11% 7% 93% 

Lepeule et al. (2012) N/A N/A 23% 67% 

* One standard deviation below the mean is equivalent to the middle of the range between the 10th and 25th

percentile. For Krewski, the LML is 5.8 μg/m3

 and one standard deviation below the mean is 11.0 μg/m3. For 

Lepeule et al., the LML is 8 μg/m3

 and we do not have the data for one standard deviation below the mean. It is 

important to emphasize that although we have lower levels of confidence in levels below the LML for each study, 

the scientific evidence does not support the existence of a level below which health effects from exposure to PM2.5

do not occur. 

Figure 4-4 . Percentage of Adult Population (age 30+) by Annual Mean PM2.5 Exposure 

in the Baseline Sector Modeling (used to generate the benefit-per-ton estimates)* 

* This graph shows the population exposure in the modeling baseline used to generate the benefit-per-ton estimates. 

Similar graphs for analyses with air quality modeling show premature mortality impacts at each PM2.5 concentration. 

Therefore, caution is warranted when interpreting this graph because it is not consistent with similar graphs from 

RIAs that had air quality modeling (e.g., MATS).

Among the populations exposed to PM2.5 in the baseline:

93% are exposed to PM2.5 levels at or above the LML of the Krewski et al. (2009) study

67% are exposed to PM2.5 levels at or above the LML of the Lepeule et al. (2012) study

0%

5%

10%

15%

20%

25%

<1 1‐2 2‐3 3‐4 4‐5 5‐6 6‐7 7‐8 8‐9 9‐10 10‐11 11‐12 12‐13 13‐14 14‐15 15‐16 16‐17 17‐18 18‐19 19‐20

Percentage of PopulationExposed

Baseline Annual MeanPM2.5 Level (μg/m3)

LML of Lepeule et al.

(2012)study

LML of Krewski et

al. (2009) study
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

3-44 

Figure 4-5 . Cumulative Distribution of Adult Population (age 30+) by Annual Mean 

PM2.5 Exposure in the Baseline Sector Modeling (used to generate the benefit-perton estimates)* 

* This graph shows the population exposure in the modeling baseline used to generate the benefit-per-ton estimates. 

Similar graphs for analyses with air quality modeling show premature mortality impacts at each PM2.5 concentration. 

Therefore, caution is warranted when interpreting this graph because it is not consistent with similar graphs from 

RIAs that had air quality modeling (e.g., MATS).

4.4 Combined Climate Benefits and Health Co-benefits Estimates 

In this analysis, we were able to monetize the estimated co-benefits associated with the 

decreased emissions of CO2 and reduced exposure to PM2.5 and ozone, but we were unable to 

monetize the co-benefits associated with reducing exposure to mercury, hydrogen chloride, 

carbon monoxide, SO2, and NO2, as well as ecosystem effects and visibility impairment. 

Specifically, we estimated the combined climate benefits at discount rates of 5 percent, 3 

percent, 2.5 percent, and 3 percent (95th percentile) (as estimated by the interagency working 

Among the populations exposed to PM2.5 in the baseline:

93% are exposed to PM2.5 levels at or above the LML of the Krewski et al. (2009) study

67% are exposed to PM2.5 levels at or above the LML of the Lepeule et al. (2012) study

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

Cumulative percentage of populationexposed

Baseline AnnualMeanPM2.5 Level(μg/m3)

LML of Krewski et

al. (2009) study

LML of Lepeule et

al. (2012) study
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3-45 

group), and health co-benefits at discount rates of 3 percent and 7 percent (as recommended by 

EPA’s Guidelines for Preparing Economic Analyses (U.S. EPA, 2010e) and OMB’s Circular A4 [OMB, 2003]). 

Different discount rates are applied to SCC than to the health co-benefit estimates 

because CO2 emissions are long-lived and subsequent damages occur over many years. 

Moreover, several rates are applied to SCC because the literature shows that it is sensitive to 

assumptions about discount rate and because no consensus exists on the appropriate rate to use in 

an intergenerational context. The SCC interagency group centered its attention on the 3 percent 

discount rate but emphasized the importance of considering all four SCC estimates.99 The EPA 

has evaluated the range of potential impacts by combining all SCC values with health co-benefits 

values at the 3 percent and 7 percent discount rates. To be consistent with concepts of 

intergenerational discounting, values for health benefits, which occur within a generation, would 

only be combined with SCC values using a lower discount rate (e.g., the 7 percent health benefit 

estimates would be combined with 5 percent or lower SCC values, but the 3 percent health 

benefit would not be combined with the 5 percent SCC value). While the 5 percent SCC and 3 

percent health benefit estimate falls within the range of values we analyze, this individual 

estimate should not be used independently in an analysis, as it represents a combination of 

discount rates that is unlikely to occur. Combining the 3 percent SCC values with the 3 percent 

health benefit values assumes that there is no difference in discount rates between 

intragenerational and intergenerational impacts. 

Tables 4-20 through 4-22 provide the combined climate and health benefits for each 

option evaluated for 2020, 2025, and 2030. Figure 4-6 shows the breakdown of the monetized 

benefits by pollutant for each option evaluated in 2020 as an illustrative analysis year using a 3 

percent discount rate. 

 

99 See the 2010 SCC TSD. Docket ID EPA-HQ-OAR-2009-0472-114577 or 

http://www.whitehouse.gov/sites/default/files/omb/inforeg/for-agencies/Social-Cost-of-Carbon-for-RIA.pdf for 

details. 
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3-46 

Table 4-20. Combined Climate Benefits and Health Co-Benefits for Proposed EGU GHG 

Existing Source Guidelines in 2020 (billions of 2011$)* 

SCC Discount Rate Climate 

Benefits Only 

Climate Benefits plus Health Co-Benefits 

(Discount Rate Applied to Health Co-Benefits) 

3% 7% 

Option 1 - state 383 million metric tonnes CO2

5% $4.9 $22 to $45 $20 to $41 

3% $18 $35 to $57 $33 to $54 

2.5% $26 $43 to $66 $42 to $62 

3% (95th percentile) $52 $69 to $92 $68 to $88 

Option 1 - regional 371 million metric tonnes CO2

5% $4.7 $21 to $42 $19 to $39 

3% $17 $33 to $54 $32 to $51 

2.5% $25 $41 to $63 $40 to $59 

3% (95th percentile) $51 $67 to $88 $65 to $85 

Option 2 - state 295 million metric tonnes CO2

5% $3.8 $17 to $35 $16 to $32 

3% $14 $27 to $45 $26 to $42 

2.5% $20 $34 to $52 $32 to $49 

3% (95th percentile) $40 $54 to $72 $53 to $69 

Option 2 - regional 283 million metric tonnes CO2

5% $3.6 $17 to $34 $16 to $32 

3% $13 $26 to $44 $25 to $41 

2.5% $19 $33 to $50 $31 to $47 

3% (95th percentile) $39 $52 to $70 $51 to $67 

*All estimates are rounded to two significant figures. Climate benefits are based on reductions in CO2 emissions. 

Co-benefits are based on regional benefit-per-ton estimates. Co-benefits for ozone are based on ozone season NOx 

emissions. Ozone co-benefits occur in analysis year, so they are the same for all discount rates. The health cobenefits reflect the sum of the PM2.5 and ozone co-benefits and reflect the range based on adult mortality functions 

(e.g., from Krewski et al. (2009) with Bell et al. (2004) to Lepeule et al. (2012) with Levy et al. (2005)). The 

monetized health co-benefits do not include reduced health effects from direct exposure to NO2, SO2, and HAP; 

ecosystem effects; or visibility impairment. 
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3-47 

Table 4-21. Combined Climate Benefits and Health Co-Benefits for Proposed EGU GHG 

Existing Source Guidelines in 2025 (billions of 2011$)* 

SCC Discount Rate Climate 

Benefits Only 

Climate Benefits plus Health Co-Benefits 

(Discount Rate Applied to Health Co-Benefits) 

3% 7% 

Option 1 - state 506 million metric tonnes CO2

5% $7.6 $31 to $62 $29 to $57 

3% $25 $49 to $80 $46 to $75 

2.5% $37 $61 to $92 $58 to $87 

3% (95th percentile) $77 $100 to $130 $98 to $130 

Option 1 - regional 501 million metric tonnes CO2

5% $7.5 $30 to $61 $28 to $56 

3% $25 $48 to $78 $46 to $74 

2.5% $37 $60 to $90 $57 to $85 

3% (95th percentile) $76 $99 to $130 $97 to $120 

Option 2 - state 376 million metric tonnes CO2

5% $5.6 $23 to $47 $22 to $43 

3% $19 $36 to $60 $35 to $56 

2.5% $28 $45 to $69 $44 to $65 

3% (95th percentile) $57 $75 to $98 $73 to $95 

Option 2 - regional 368 million metric tonnes CO2

5% $5.5 $23 to $46 $21 to $42 

3% $18 $36 to $59 $34 to $55 

2.5% $27 $44 to $67 $43 to $64 

3% (95th percentile) $56 $73 to $96 $72 to $93 

*All estimates are rounded to two significant figures. Climate benefits are based on reductions in CO2 emissions. 

Co-benefits are based on regional benefit-per-ton estimates. Co-benefits for ozone are based on ozone season NOx 

emissions. Ozone co-benefits occur in analysis year, so they are the same for all discount rates. The health cobenefits reflect the sum of the PM2.5 and ozone co-benefits and reflect the range based on adult mortality functions 

(e.g., from Krewski et al. (2009) with Bell et al. (2004) to Lepeule et al. (2012) with Levy et al. (2005)). It is 

important to note that the monetized health co-benefits do not include reduced health effects from direct exposure to 

NO2, SO2, and HAP; ecosystem effects; or visibility impairment. 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

3-48 

Table 4-22. Combined Climate Benefits and Health Co-Benefits for Proposed EGU GHG 

Existing Source Guidelines in 2030 (billions of 2011$)* 

SCC Discount Rate Climate 

Benefits Only 

Climate Benefits plus Health Co-Benefits 

(Discount Rate Applied to Health Co-Benefits) 

3% 7% 

Option 1 - state 555 million metric tonnes CO2

5% $9.5 $36 to $72 $34 to $66 

3% $31 $57 to $93 $55 to $87 

2.5% $44 $71 to $110 $69 to $100 

3% (95th percentile) $94 $120 to $160 $120 to $150 

Option 1 - regional 545 million metric tonnes CO2

5% $9.3 $35 to $68 $32 to $63 

3% $30 $55 to $89 $53 to $84 

2.5% $44 $69 to $100 $66 to $97 

3% (95th percentile) $92 $120 to $150 $120 to $150 

Option 2 - state 373 million metric tonnes CO2

5% $6.4 $24 to $48 $23 to $44 

3% $21 $39 to $63 $37 to $59 

2.5% $30 $48 to $72 $46 to $68 

3% (95th percentile) $63 $81 to $110 $80 to $100 

Option 2 - regional 353 million metric tonnes CO2

5% $6.0 $23 to $46 $21 to $42 

3% $20 $37 to $59 $35 to $56 

2.5% $28 $45 to $68 $44 to $64 

3% (95th percentile) $60 $77 to $100 $75 to $96 

*All estimates are rounded to two significant figures. Climate benefits are based on reductions in CO2 emissions. 

Co-benefits are based on regional benefit-per-ton estimates. Co-benefits for ozone are based on ozone season NOx 

emissions. Ozone co-benefits occur in analysis year, so they are the same for all discount rates. The health cobenefits reflect the sum of the PM2.5 and ozone co-benefits and reflect the range based on adult mortality functions 

(e.g., from Krewski et al. (2009) with Bell et al. (2004) to Lepeule et al. (2012) with Levy et al. (2005)). It is 

important to note that the monetized health co-benefits do not include reduced health effects from direct exposure to 

NO2, SO2, and HAP; ecosystem effects; or visibility impairment. 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

3-49 

Figure 4-6. Breakdown of Combined Monetized Climate and Health Co-benefits of 

Proposed EGU GHG Existing Source Guidelines in 2020 by Option (Regional 

Compliance) and Pollutant (3% discount rate)* 

* “Low Health Co-benefits” refers to the combined health co-benefits estimated using the Bell et al. (2004) 

mortality study for ozone with the Krewski et al. (2009) mortality study for PM2.5. “High Health Co-benefits” refers 

to the combined health co-benefits estimated using the Levy et al. (2005) mortality study for ozone with the Lepeule 

et al. (2012) mortality study for PM2.5. Results would be similar if the state compliance scenario was shown.

4.5 Unquantified Co-benefits 

The monetized co-benefits estimated in this RIA only reflect a subset of co-benefits 

attributable to the health effect reductions associated with ambient fine particles and ozone. Data, 

time, and resource limitations prevented EPA from quantifying the impacts to, or monetizing the 

co-benefits from several important benefit categories, including co-benefits associated with 

exposure to several HAP (including mercury and hydrogen chloride) SO2 and NO2, as well as 

CO2 52%

SO2 35%

Directly

emitted

PM2.5

(EC+OC) 2%

Directly

emitted

PM2.5

(Crustal) 2%

NOx (as

PM2.5)

7%

NOx (as

Ozone) 2%

Option 1 ‐ Regional

CO2 31%

SO2 49%

Directly

emitted

PM2.5

(EC+OC) 3%

Directly

emitted

PM2.5

(Crustal) 3%

NOx (as

PM2.5)

9%

NOx (as

Ozone) 5%

Option 1 ‐ Regional

CO2 50%

SO2 37%

Directly

emitted

PM2.5

(EC+OC) 2%

Directly

emitted

PM2.5

(Crustal) 2%

NOx (as

PM2.5)

7%

NOx (as

Ozone) 2%

Option 2 ‐ Regional

CO2 30%

SO2 50%

Directly

emitted

PM2.5

(EC+OC) 3%

Directly

emitted

PM2.5

(Crustal) 3%

NOx (as

PM2.5) NOx (as 9% Ozone) 5%

Option 2 ‐ Regional

Low Health Co‐benefits     High Health Co‐benefits  
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review*** 

3-50 

ecosystem effects, and visibility impairment due to the absence of air quality modeling data for 

these pollutants in this analysis. This does not imply that there are no co-benefits associated with 

these emission reductions. In this section, we provide a qualitative description of these benefits, 

which are listed in Table 4-23. 

Table 4-23. Unquantified Health and Welfare Co-benefits Categories 

Category Specific Effect 

Effect Has 

Been 

Quantified 

Effect Has 

Been 

Monetized 

More 

Information 

Improved Human Health 

Reduced incidence of 

morbidity from 

exposure to NO2

Asthma hospital admissions (all ages) — — NO2 ISA1

Chronic lung disease hospital admissions (age > 

65) — — NO2 ISA1

Respiratory emergency department visits (all ages) — — NO2 ISA1

Asthma exacerbation (asthmatics age 4–18) — — NO2 ISA1

Acute respiratory symptoms (age 7–14) — — NO2 ISA1

Premature mortality — — NO2 ISA1,2,3

Other respiratory effects (e.g., airway 

hyperresponsiveness and inflammation, lung 

function, other ages and populations) 

— — NO2 ISA2,3

Reduced incidence of 

morbidity from 

exposure to SO2

Respiratory hospital admissions (age > 65) — — SO2 ISA1

Asthma emergency department visits (all ages) — — SO2 ISA1

Asthma exacerbation (asthmatics age 4–12) — — SO2 ISA1

Acute respiratory symptoms (age 7–14) — — SO2 ISA1

Premature mortality — — SO2 ISA1,2,3

Other respiratory effects (e.g., airway 

hyperresponsiveness and inflammation, lung 

function, other ages and populations) 

— — SO2 ISA1,2

Reduced incidence of 

morbidity from 

exposure to CO 

Cardiovascular effects — — CO ISA 1,2

Respiratory effects — — CO ISA 1,2,3

Central nervous system effects — — CO ISA 1,2,3

Premature mortality — — CO ISA 1,2,3

Reduced incidence of 

morbidity from 

exposure to 

methylmercury 

Neurologic effects—IQ loss — — IRIS; NRC, 

20001

Other neurologic effects (e.g., developmental 

delays, memory, behavior) — — IRIS; NRC, 

20002

Cardiovascular effects — — IRIS; NRC, 

20002,3

Genotoxic, immunologic, and other toxic effects — — IRIS; NRC, 

20002,3

Reduced incidence of 

morbidity from exposure 

to HAP 

Effects associated with exposure to hydrogen 

chloride — — ATSDR, IRIS1,2

Improved Environment 

1.2 Table 4-12. Continued 

Reduced visibility Visibility in Class 1 areas — — PM ISA1
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Category Specific Effect 

Effect Has 

Been 

Quantified 

Effect Has 

Been 

Monetized 

More 

Information 

impairment Visibility in residential areas — — PM ISA1

Reduced effects on 

materials 

Household soiling — — PM ISA1,2

Materials damage (e.g., corrosion, increased wear) — — PM ISA2

Reduced effects from 

PM deposition (metals 

and organics) 

Effects on Individual organisms and ecosystems — — PM ISA2

Reduced vegetation 

and ecosystem effects 

from exposure to ozone 

Visible foliar injury on vegetation — — Ozone ISA1

Reduced vegetation growth and reproduction — — Ozone ISA1

Yield and quality of commercial forest products 

and crops — — Ozone ISA1

Damage to urban ornamental plants — — Ozone ISA2

Carbon sequestration in terrestrial ecosystems — — Ozone ISA1

Recreational demand associated with forest 

aesthetics — — Ozone ISA2

Other non-use effects Ozone ISA2

Ecosystem functions (e.g., water cycling, 

biogeochemical cycles, net primary productivity, 

leaf-gas exchange, community composition) 

— — Ozone ISA2

Reduced effects from 

acid deposition 

Recreational fishing — — NOx SOx ISA1

Tree mortality and decline — — NOx SOx ISA2

Commercial fishing and forestry effects — — NOx SOx ISA2

Recreational demand in terrestrial and aquatic 

ecosystems — — NOx SOx ISA2

Other non-use effects NOx SOx ISA2

Ecosystem functions (e.g., biogeochemical cycles) — — NOx SOx ISA2

Reduced effects from 

nutrient enrichment 

Species composition and biodiversity in terrestrial 

and estuarine ecosystems — — NOx SOx ISA2

Coastal eutrophication — — NOx SOx ISA2

Recreational demand in terrestrial and estuarine 

ecosystems — — NOx SOx ISA2

Other non-use effects NOx SOx ISA2

Ecosystem functions (e.g., biogeochemical cycles, 

fire regulation) — — NOx SOx ISA2

Reduced vegetation 

effects from ambient 

exposure to SO2 and 

NOx

Injury to vegetation from SO2 exposure — — NOx SOx ISA2

Injury to vegetation from NOx exposure — — NOx SOx ISA2

Reduced ecosystem 

effects from exposure 

to methylmercury 

Effects on fish, birds, and mammals (e.g., 

reproductive effects) — — Mercury Study 

RTC2

Commercial, subsistence and recreational fishing — — Mercury Study 

RTC1

1 We assess these co-benefits qualitatively due to data and resource limitations for this RIA. 

2

We assess these co-benefits qualitatively because we do not have sufficient confidence in available data or 

methods. 

3 We assess these co-benefits qualitatively because current evidence is only suggestive of causality or there are other 

significant concerns over the strength of the association. 
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4.5.1 HAP Co-benefits 

Due to methodology and resource limitations, we were unable to estimate the co-benefits 

associated with reducing emissions of the hazardous air pollutants in this analysis. EPA’s SABHES concluded that “the challenges for assessing progress in health improvement as a result of 

reductions in emissions of hazardous air pollutants (HAPs) are daunting...due to a lack of 

exposure-response functions, uncertainties in emissions inventories and background levels, the 

difficulty of extrapolating risk estimates to low doses and the challenges of tracking health 

progress for diseases, such as cancer, that have long latency periods” (U.S. EPA-SAB, 2008). In 

2009, EPA convened a workshop to address the inherent complexities, limitations, and 

uncertainties in current methods to quantify the benefits of reducing HAP. Recommendations 

from this workshop included identifying research priorities, focusing on susceptible and 

vulnerable populations, and improving dose-response relationships (Gwinn et al., 2011). 

Chapter 4 of the MATS RIA (U.S. EPA, 2011b) describes the health effects associated 

with HAP emitted by EGUs. Below we describe the health effects associated with the two HAP 

for which we were able to quantify emission reductions for the proposed guidelines: mercury and 

hydrogen chloride. Using the IPM modeling described in Chapter 3 of this RIA, we estimate that 

the illustrative compliance scenarios for the proposed guidelines would reduce mercury 

emissions by up to 2.1 tons and hydrogen chloride by up to 590 tons by 2030. These HAP 

emission reductions are beyond those achieved by MATS. 

4.5.1.1 Mercury 

Mercury in the environment is transformed into a more toxic form, methylmercury 

(MeHg). Because Hg is a persistent pollutant, MeHg accumulates in the food chain, especially 

the tissue of fish. When people consume these fish, they consume MeHg. In 2000, the NAS 

Study was issued which provides a thorough review of the effects of MeHg on human health 

(NRC, 2000).100 Many of the peer-reviewed articles cited in this section are publications 

originally cited in the Mercury Study.101 In addition, EPA has conducted literature searches to 

 

100 National Research Council (NRC). 2000. Toxicological Effects of Methylmercury. Washington, DC: National 

Academies Press. 

101 U.S. Environmental Protection Agency (U.S. EPA). 1997. Mercury Study Report to Congress, EPA–HQ–OAR–

2009–0234–3054. December. Available on the Internet at <http://www.epa.gov/hg/report.htm>. 
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3-53 

obtain other related and more recent publications to complement the material summarized by the 

NRC in 2000. 

In its review of the literature, the NAS found neurodevelopmental effects to be the most 

sensitive and best documented endpoints and appropriate for establishing a reference dose (RfD) 

(NRC, 2000); in particular NAS supported the use of results from neurobehavioral or 

neuropsychological tests. The NAS report noted that studies in animals reported sensory effects 

as well as effects on brain development and memory functions and support the conclusions based 

on epidemiology studies. The NAS noted that their recommended endpoints for an RfD are 

associated with the ability of children to learn and to succeed in school. They concluded the 

following: “The population at highest risk is the children of women who consumed large 

amounts of fish and seafood during pregnancy. The committee concludes that the risk to that 

population is likely to be sufficient to result in an increase in the number of children who have to 

struggle to keep up in school.” 

The NAS summarized data on cardiovascular effects available up to 2000. Based on these 

and other studies, the NRC concluded that “Although the data base is not as extensive for 

cardiovascular effects as it is for other end points (i.e., neurologic effects), the cardiovascular 

system appears to be a target for MeHg toxicity in humans and animals.” The NRC also stated 

that “additional studies are needed to better characterize the effect of methylmercury exposure on 

blood pressure and cardiovascular function at various stages of life.” 

Additional cardiovascular studies have been published since 2000. EPA did not develop a 

quantitative dose-response assessment for cardiovascular effects associated with MeHg 

exposures, as there is no consensus among scientists on the dose-response functions for these 

effects. In addition, there is inconsistency among available studies as to the association between 

MeHg exposure and various cardiovascular system effects. The pharmacokinetics of some of the 

exposure measures (such as toenail Hg levels) are not well understood. The studies have not yet 

received the review and scrutiny of the more well-established neurotoxicity data base. 

The Mercury Study noted that MeHg is not a potent mutagen but is capable of causing 

chromosomal damage in a number of experimental systems. The NAS concluded that evidence 

that human exposure to MeHg caused genetic damage is inconclusive; they note that some earlier 

studies showing chromosomal damage in lymphocytes may not have controlled sufficiently for 
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potential confounders. One study of adults living in the Tapajós River region in Brazil (Amorim 

et al., 2000) reported a direct relationship between MeHg concentration in hair and DNA damage 

in lymphocytes, as well as effects on chromosomes.102 Long-term MeHg exposures in this 

population were believed to occur through consumption of fish, suggesting that genotoxic effects 

(largely chromosomal aberrations) may result from dietary, and chronic MeHg exposures similar 

to and above those seen in the Faroes and Seychelles populations. 

Although exposure to some forms of Hg can result in a decrease in immune activity or an 

autoimmune response (ATSDR, 1999), evidence for immunotoxic effects of MeHg is limited 

(NRC, 2000)103. 

Based on limited human and animal data, MeHg is classified as a “possible” human 

carcinogen by the International Agency for Research on Cancer (IARC, 1994)104 and in IRIS 

(U.S. EPA, 2002).105 The existing evidence supporting the possibility of carcinogenic effects in 

humans from low-dose chronic exposures is tenuous. Multiple human epidemiological studies 

have found no significant association between Hg exposure and overall cancer incidence, 

although a few studies have shown an association between Hg exposure and specific types of 

cancer incidence (e.g., acute leukemia and liver cancer) (NRC, 2000). 

There is also some evidence of reproductive and renal toxicity in humans from MeHg 

exposure. However, overall, human data regarding reproductive, renal, and hematological 

toxicity from MeHg are very limited and are based on either studies of the two high-dose 

poisoning episodes in Iraq and Japan or animal data, rather than epidemiological studies of 

chronic exposures at the levels of interest in this analysis. 

 

102 Amorim, M.I.M., D. Mergler, M.O. Bahia, H. Dubeau, D. Miranda, J. Lebel, R.R. Burbano, and M. Lucotte. 

2000. Cytogenetic damage related to low levels of methyl mercury contamination in the Brazilian Amazon. An. 

Acad. Bras. Ciênc. 72(4): 497-507. 

103 Agency for Toxic Substances and Disease Registry (ATSDR). 1999. Toxicological Profile for Mercury. U.S. 

Department of Health and Human Services, Public Health Service, Atlanta, GA. 

104 International Agency for Research on Cancer (IARC). 1994. IARC Monographs on the Evaluation of 

Carcinogenic Risks to Humans and their Supplements: Beryllium, Cadmium, Mercury, and Exposures in the 

Glass Manufacturing Industry. Vol. 58. Jalili, H.A., and A.H. Abbasi. 1961. Poisoning by ethyl mercury toluene 

sulphonanilide. Br. J. Indust. Med. 18(Oct.):303-308 (as cited in NRC, 2000). 

105 U.S. Environmental Protection Agency (EPA). 2002. Integrated Risk Information System (IRIS) on 

Methylmercury. National Center for Environmental Assessment. Office of Research and Development. Available 

at http://www.epa.gov/iris/subst/0073.htm. 
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4.5.1.2 Hydrogen Chloride 

Hydrogen chloride (HCl) is a corrosive gas that can cause irritation of the mucous 

membranes of the nose, throat, and respiratory tract. Brief exposure to 35 ppm causes throat 

irritation, and levels of 50 to 100 ppm are barely tolerable for 1 hour.106 The greatest impact is on 

the upper respiratory tract; exposure to high concentrations can rapidly lead to swelling and 

spasm of the throat and suffocation. Most seriously exposed persons have immediate onset of 

rapid breathing, blue coloring of the skin, and narrowing of the bronchioles. Exposure to HCl can 

lead to Reactive Airways Dysfunction Syndrome (RADS), a chemically, or irritant-induced type 

of asthma. Children may be more vulnerable to corrosive agents than adults because of the 

relatively smaller diameter of their airways. Children may also be more vulnerable to gas 

exposure because of increased minute ventilation per kg and failure to evacuate an area promptly 

when exposed. Hydrogen chloride has not been classified for carcinogenic effects.107

4.5.2 Additional NO2 Health Co-Benefits 

In addition to being a precursor to PM2.5 and ozone, NOx emissions are also associated 

with a variety of adverse health effects associated with direct exposure. Unfortunately, we were 

unable to estimate the health co-benefits associated with reduced NO2 exposure in this analysis. 

Therefore, this analysis only quantified and monetized the PM2.5 and ozone co-benefits 

associated with the reductions in NO2 emissions. 

Following a comprehensive review of health evidence from epidemiologic and laboratory 

studies, the Integrated Science Assessment for Oxides of Nitrogen —Health Criteria (NOx ISA) 

(U.S. EPA, 2008c) concluded that there is a likely causal relationship between respiratory health 

effects and short-term exposure to NO2. The NOx ISA concluded that the evidence “is sufficient 

to infer a likely causal relationship between short-term NO2 exposure and adverse effects on the 

respiratory system.” These epidemiologic and experimental studies encompass a number of 

endpoints including emergency department visits and hospitalizations, respiratory symptoms, 

airway hyperresponsiveness, airway inflammation, and lung function. The NOx ISA also 

 

106 Agency for Toxic Substances and Disease Registry (ATSDR). Medical Management Guidelines for Hydrogen 

Chloride. Atlanta, GA: U.S. Department of Health and Human Services. Available at 

http://www.atsdr.cdc.gov/mmg/mmg.asp?id=758&tid=147#bookmark02. 107 U.S. Environmental Protection Agency (U.S. EPA). 1995. “Integrated Risk Information System File of Hydrogen 

Chloride.” Washington, DC: Research and Development, National Center for Environmental Assessment. This 

material is available at http://www.epa.gov/iris/subst/0396.htm. 
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concluded that the relationship between short-term NO2 exposure and premature mortality was 

“suggestive but not sufficient to infer a causal relationship,” because it is difficult to attribute the 

mortality risk effects to NO2 alone. Although the NOx ISA stated that studies consistently 

reported a relationship between NO2 exposure and mortality, the effect was generally smaller 

than that for other pollutants such as PM. 

4.5.3 Additional SO2 Health Co-Benefits 

In addition to being a precursor to PM2.5, SO2 emissions are also associated with a variety 

of adverse health effects associated with direct exposure. Unfortunately, we were unable to 

estimate the health co-benefits associated with reduced SO2 in this analysis because we do not 

have air quality modeling data available. Therefore, this analysis only quantifies and monetizes 

the PM2.5 co-benefits associated with the reductions in SO2 emissions. 

Following an extensive evaluation of health evidence from epidemiologic and laboratory 

studies, the Integrated Science Assessment for Oxides of Sulfur —Health Criteria (SO2 ISA) 

concluded that there is a causal relationship between respiratory health effects and short-term 

exposure to SO2 (U.S. EPA, 2008a). The immediate effect of SO2 on the respiratory system in 

humans is bronchoconstriction. Asthmatics are more sensitive to the effects of SO2 likely 

resulting from preexisting inflammation associated with this disease. A clear concentrationresponse relationship has been demonstrated in laboratory studies following exposures to SO2 at 

concentrations between 20 and 100 ppb, both in terms of increasing severity of effect and 

percentage of asthmatics adversely affected. Based on our review of this information, we 

identified four short-term morbidity endpoints that the SO2 ISA identified as a “causal 

relationship”: asthma exacerbation, respiratory-related emergency department visits, and 

respiratory-related hospitalizations. The differing evidence and associated strength of the 

evidence for these different effects is described in detail in the SO2 ISA. The SO2 ISA also 

concluded that the relationship between short-term SO2 exposure and premature mortality was 

“suggestive of a causal relationship” because it is difficult to attribute the mortality risk effects to 

SO2 alone. Although the SO2 ISA stated that studies are generally consistent in reporting a 

relationship between SO2 exposure and mortality, there was a lack of robustness of the observed 

associations to adjustment for pollutants. We did not quantify these co-benefits due to data 

constraints. 
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4.5.4 Additional NO2 and SO2 Welfare Co-Benefits 

As described in the Integrated Science Assessment for Oxides of Nitrogen and Sulfur —

Ecological Criteria (NOx ISA) (U.S. EPA, 2008d), SO2 and NOx emissions also contribute to a 

variety of adverse welfare effects, including acidic deposition, visibility impairment, and nutrient 

enrichment. Deposition of nitrogen causes acidification, which can cause a loss of biodiversity of 

fishes, zooplankton, and macro invertebrates in aquatic ecosystems, as well as a decline in 

sensitive tree species, such as red spruce (Picea rubens) and sugar maple (Acer saccharum) in 

terrestrial ecosystems. In the northeastern U.S., the surface waters affected by acidification are a 

source of food for some recreational and subsistence fishermen and for other consumers and 

support several cultural services, including aesthetic and educational services and recreational 

fishing. Biological effects of acidification in terrestrial ecosystems are generally linked to 

aluminum toxicity, which can cause reduced root growth, which restricts the ability of the plant 

to take up water and nutrients. These direct effects can, in turn, increase the sensitivity of these 

plants to stresses, such as droughts, cold temperatures, insect pests, and disease leading to 

increased mortality of canopy trees. Terrestrial acidification affects several important ecological 

services, including declines in habitat for threatened and endangered species (cultural), declines 

in forest aesthetics (cultural), declines in forest productivity (provisioning), and increases in 

forest soil erosion and reductions in water retention (cultural and regulating). (U.S. EPA, 2008d) 

Deposition of nitrogen is also associated with aquatic and terrestrial nutrient enrichment. In 

estuarine waters, excess nutrient enrichment can lead to eutrophication. Eutrophication of 

estuaries can disrupt an important source of food production, particularly fish and shellfish 

production, and a variety of cultural ecosystem services, including water-based recreational and 

aesthetic services. Terrestrial nutrient enrichment is associated with changes in the types and 

number of species and biodiversity in terrestrial systems. Excessive nitrogen deposition upsets 

the balance between native and nonnative plants, changing the ability of an area to support 

biodiversity. When the composition of species changes, then fire frequency and intensity can 

also change, as nonnative grasses fuel more frequent and more intense wildfires. (U.S. EPA, 

2008d) 
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4.5.5 Ozone Welfare Co-Benefits 

Exposure to ozone has been associated with a wide array of vegetation and ecosystem 

effects in the published literature (U.S. EPA, 2013b). Sensitivity to ozone is highly variable 

across species, with over 65 plan species identified as “ozone-sensitive”, many of which occur in 

state and national parks and forests. These effects include those that damage or impair the 

intended use of the plant or ecosystem. Such effects are considered adverse to the public welfare 

and can include reduced growth and/or biomass production in sensitive plant species, including 

forest trees, reduced crop yields, visible foliar injury, reduced plant vigor (e.g., increased 

susceptibility to harsh weather, disease, insect pest infestation, and competition), species 

composition shift, and changes in ecosystems and associated ecosystem services. 

4.5.6 Carbon Monoxide Co-Benefits 

CO in ambient air is formed primarily by the incomplete combustion of carbon-containing 

fuels and photochemical reactions in the atmosphere. The amount of CO emitted from these 

reactions, relative to carbon dioxide (CO2), is sensitive to conditions in the combustion zone, 

such as fuel oxygen content, burn temperature, or mixing time. Upon inhalation, CO diffuses 

through the respiratory system to the blood, which can cause hypoxia (reduced oxygen 

availability). Carbon monoxide can elicit a broad range of effects in multiple tissues and organ 

systems that are dependent upon concentration and duration of exposure. The Integrated Science 

Assessment for Carbon Monoxide (U.S. EPA, 2010a) concluded that short-term exposure to CO 

is “likely to have a causal relationship” with cardiovascular morbidity, particularly in individuals 

with coronary heart disease. Epidemiologic studies associate short-term CO exposure with 

increased risk of emergency department visits and hospital admissions. Coronary heart disease 

includes those who have angina pectoris (cardiac chest pain), as well as those who have 

experienced a heart attack. Other subpopulations potentially at risk include individuals with 

diseases such as chronic obstructive pulmonary disease (COPD), anemia, or diabetes, and 

individuals in very early or late life stages, such as older adults or the developing young. The 

evidence is suggestive of a causal relationship between short-term exposure to CO and 

respiratory morbidity and mortality. The evidence is also suggestive of a causal relationship for 

birth outcomes and developmental effects following long-term exposure to CO, and for central 

nervous system effects linked to short- and long-term exposure to CO. 
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4.5.7 Visibility Impairment Co-Benefits 

Reducing secondary formation of PM2.5 would improve levels visibility in the U.S. because 

suspended particles and gases degrade visibility by scattering and absorbing light (U.S. EPA, 

2009b). Fine particles with significant light-extinction efficiencies include sulfates, nitrates, 

organic carbon, elemental carbon, and soil (Sisler, 1996). Visibility has direct significance to 

people’s enjoyment of daily activities and their overall sense of wellbeing. Good visibility 

increases the quality of life where individuals live and work, and where they engage in 

recreational activities. Particulate sulfate is the dominant source of regional haze in the eastern 

U.S. and particulate nitrate is an important contributor to light extinction in California and the 

upper Midwestern U.S., particularly during winter (U.S. EPA, 2009b). Previous analyses (U.S. 

EPA, 2011a) show that visibility co-benefits can be a significant welfare benefit category. 

Without air quality modeling, we are unable to estimate visibility related benefits, and we are 

also unable to determine whether the emission reductions associated with the proposed 

guidelines would be likely to have a significant impact on visibility in urban areas or Class I 

areas. 

 
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Final Mercury and Air Toxics Standards. EPA-452/R-11-011. December. Available at: 

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U.S. Environmental Protection Agency (U.S. EPA). 2011c. Regulatory Impact Analysis: 

National Emission Standards for Hazardous Air Pollutants for Industrial, Commercial, and 

Institutional Boilers and Process Heaters. February. Available at: 

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the Particulate Matter National Ambient Air Quality Standards. EPA-452/D-11-003. Office 

of Air Quality Planning and Standards, Health and Environmental Impacts Division. April. 

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U.S. Environmental Protection Agency (U.S. EPA). 2012a. Regulatory Impact Analysis for the 

Final Revisions to the National Ambient Air Quality Standards for Particulate Matter. EPA452/R-12-003. Office of Air Quality Planning and Standards, Health and Environmental 

Impacts Division. December. Available at: <http://www.epa.gov/pm/2012/finalria.pdf>. 

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Petroleum Refineries New Source Performance Standards Ja. Office of Air Quality Planning 

and Standards, Health and Environmental Impacts Division. June. Available at: 

<http://www.epa.gov/ttnecas1/regdata/RIAs/refineries_nsps_ja_final_ria.pdf>. 

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Estimating the Benefit per ton of Reducing PM2.5 Precursors from 17 sectors. Office of Air 

Quality Planning and Standards, Research Triangle Park, NC. February. Available at: 

<http://www.epa.gov/airquality/benmap/models/Source_Apportionment_BPT_TSD_1_31_13

.pdf>. 

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Ozone and Related Photochemical Oxidants (Final Report). U.S. Environmental Protection 

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Assessment for Ozone Second External Review Draft. EPA-452/P-14-003a. Office of Air 

Quality Planning and Standards, Research Triangle Park, NC. February. Available at: 

<http://www.epa.gov/ttn/naaqs/standards/ozone/data/20140131welfarerea.pdf>. 
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U.S. Environmental Protection Agency—Science Advisory Board (U.S. EPA-SAB). 2002. 

Workshop on the Benefits of Reductions in Exposure to Hazardous Air Pollutants: 

Developing Best Estimates of Dose-Response Functions An SAB Workshop Report of an 

EPA/SAB Workshop (Final Report). EPA-SAB-EC-WKSHP-02-001. January. Available at: 

<http://yosemite.epa.gov/sab%5CSABPRODUCT.NSF/34355712EC011A358525719A005B

F6F6/$File/ecwkshp02001%2Bappa-g.pdf>. 

U.S. Environmental Protection Agency—Science Advisory Board (U.S. EPA-SAB). 2008. 

Characterizing Uncertainty in Particulate Matter Benefits Using Expert Elicitation. EPACOUNCIL-08-002. July. Available at: 

<http://yosemite.epa.gov/sab/sabproduct.nsf/0/43B91173651AED9E85257487004EA6CB/$F

ile/EPA-COUNCIL-08-002-unsigned.pdf>. 

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SAB Report on EPA’s White Paper Valuing the Benefits of Fatal Cancer Risk Reduction.

EPA-SAB-EEAC-00-013. July. Available at: 

<http://yosemite.epa.gov/sab%5CSABPRODUCT.NSF/41334524148BCCD6852571A70051

6498/$File/eeacf013.pdf>. 

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Advisory Council on Clean Air Compliance Analysis Response to Agency Request on 

Cessation Lag. EPA-COUNCIL-LTR-05-001. December. Available at: 

<http://yosemite.epa.gov/sab/sabproduct.nsf/0/39F44B098DB49F3C85257170005293E0/$Fil

e/council_ltr_05_001.pdf>. 

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Benefits of Reducing Benzene Emissions in Houston, 1990–2020. EPA-COUNCIL-08-001. 

July. Available at: 

<http://yosemite.epa.gov/sab/sabproduct.nsf/D4D7EC9DAEDA8A548525748600728A83/$Fi

le/EPA-COUNCIL-08-001-unsigned.pdf>. 

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Draft, December 2008). EPA-COUNCIL-09-008. May. Available at: 

<http://yosemite.epa.gov/sab/SABPRODUCT.NSF/81e39f4c09954fcb85256ead006be86e/73

ACCA834AB44A10852575BD0064346B/$File/EPA-CASAC-09-008-unsigned.pdf>. 
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U.S. Environmental Protection Agency—Science Advisory Board (U.S. EPA-SAB). 2009c. 

Review of Integrated Science Assessment for Particulate Matter (Second External Review 

Draft, July 2009). EPA-CASAC-10-001. November. Available at: 

<http://yosemite.epa.gov/sab/SABPRODUCT.NSF/81e39f4c09954fcb85256ead006be86e/15

1B1F83B023145585257678006836B9/$File/EPA-CASAC-10-001-unsigned.pdf>. 

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Review of EPA’s DRAFT Health Benefits of the Second Section 812 Prospective Study of the 

Clean Air Act. EPA-COUNCIL-10-001. June. Available at: < 

http://yosemite.epa.gov/sab/sabproduct.nsf/9288428b8eeea4c885257242006935a3/72D4EFA

39E48CDB28525774500738776/$File/EPA-COUNCIL-10-001-unsigned.pdf>. 

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Review of Valuing Mortality Risk Reductions for Environmental Policy: A White Paper 

(December 10, 2010). EPA-SAB-11-011 July. Available at: 

<http://yosemite.epa.gov/sab/sabproduct.nsf/298E1F50F844BC23852578DC0059A616/$File/

EPA-SAB-11-011-unsigned.pdf>. 

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United States. Thomas R. Karl, Jerry M. Melillo, and Thomas C. Peterson, (eds.). Cambridge 

University Press. 

Woodruff, T.J., J. Grillo, and K.C. Schoendorf. 1997. “The Relationship between Selected of 

postneonatal infant mortality and particulate air pollution in the United States.” 

Environmental Health Perspectives 105 (6): 608-612. 
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5-1 

APPENDIX 4A: GENERATING REGIONAL BENEFIT-PER-TON ESTIMATES FOR 

ELECTRIC GENERATING UNITS

The purpose of this appendix is to provide additional detail regarding the generation of 

the benefit-per-ton estimates applied in Chapter 4 of this Regulatory Impact Analysis (RIA). 

Specifically, this appendix describes the methods for generating benefit-per-ton estimates by 

region for PM2.5 and ozone precursors emitted by the electrical generating unit (EGU) sector. 

 4A.1 Overview of Benefit-per-Ton Estimates 

As described in the Technical Support Document: Estimating the Benefit per Ton of 

Reducing PM2.5 Precursors from 17 Sectors (U.S. EPA, 2013a) (hereafter “BPT TSD”), the 

procedure for calculating average benefit-per-ton coefficients generally follows three steps, 

shown graphically in Figure 4A-1. As an example, in order to calculate national average benefitper-ton estimates for each ambient PM2.5 precursor emitted from EGU sources, we: 

1. Use air quality modeling to predict ambient concentrations of primary PM2.5, nitrate and 

sulfate across the contiguous U.S. that are attributable to the EGU sector. 

2. Estimate the health impacts, and the economic value of these impacts, associated with the 

attributable ambient concentrations of primary PM2.5, sulfate and nitrate PM2.5 using the 

environmental Benefits Mapping and Analysis Program (BenMAP v4.0.66)108 (Abt 

Associates, Inc, 2012). 

3. Divide the PM2.5-related health impacts attributable to each type of PM2.5, and the 

monetary value of these impacts, by the level of associated precursor emissions. That is, 

primary PM2.5 benefits are divided by direct PM2.5 emissions, sulfate benefits are divided 

by SO2 emissions, and nitrate benefits are divided by NOx emissions. 

 

108 In this stage we estimate the PM2.5-related impacts associated with changes in directly emitted PM2.5, nitrate and sulfate separately, so that 

we may ultimately calculate the benefitper-ton reduced of the corresponding PM2.5 precursor, or directly emitted PM2.5, in step 3. When 

estimating these impacts we apply effect coefficients that relate changes in total PM2.5 mass to the risk of adverse health outcomes; we do not 

apply effect coefficients that are differentiated by PM2.5 specie. 
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Figure 4A-1. Conceptual Overview of Benefit-per-Ton Calculation 

4A.2 Underlying Source Apportionment Air Quality Modeling 

EPA performed a national-scale air quality modeling analysis using the Comprehensive 

Air Quality Model with Extensions (CAMx) model109 to estimate PM2.5 and ozone 

concentrations attributable to 17 industrial sectors, including EGUs. In this section, we provide a 

short summary of the air quality modeling used to generate these benefit-per-ton estimates. 

Readers interested in a full discussion of the air quality modeling may consult the Air Quality 

Modeling Technical Support Document: Source Sector Assessments (U.S. EPA, 2011a). The 

source apportionment modeling is also discussed in Fann, Baker and Fulcher (2012). 

CAMx simulates the numerous physical and chemical processes involved in the 

formation, transport, and destruction of ozone, particulate matter and air toxics. Emissions of 

precursor species are injected into the model where they react to form secondary species such as 

ozone and then transport around the modeling domain before ultimately being removed by 

deposition or chemical reaction. Source apportionment techniques track the formation and 

transport of ozone and PM from specific emissions sources and calculate the contribution of 

sources and precursors to ozone and PM2.5 at individual receptor locations. In contrast to “zero-

 

109 Environ International Corporation. 2010. Comprehensive Air Quality Model with Extensions, 

Version 5.3. User’s Guide. Novato, CA. December. Available at <http://www.camx.com>. 

PM

2.5 air quality 

change for a 

given sector

Human health 

benefits

Benefit-per-ton 

calculation
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5-3 

out” modeling techniques, the tracking of emissions and resulting pollution in source 

apportionment modeling does not affect the transport, chemical transformation, or atmospheric 

chemical relationships within the modeling. More details on the implementation of source 

apportionment in CAMx can be found in the CAMx user’s guide. 

The modeling analyses were performed for a domain covering the continental U.S. This 

domain has a parent horizontal grid of 36 km with two finer-scale 12 km grids over the eastern 

and western U.S. The base year of data used to construct the modeling platform includes 

emissions and meteorology for 2005. Specifically, the starting point for the emission projections 

in this modeling was the 2005 v4.3 emissions platform (U.S. EPA, 2005). EGU emission 

estimates for 2016 are from the Integrated Planning Model (IPM), and the projections include 

emission reductions related to the NOx State Implementation Plan Call (U.S. EPA, 1998) and the 

proposed Transport Rule (U.S. EPA, 2010c).110

4A.3 Regional PM2.5 Benefit-per-Ton Estimates for EGUs 

The approach for generating regional benefit-per-ton estimates for PM2.5 from EGU 

emissions is a small modification of the approach described above from the BPT TSD. The 

regional benefit-per-ton estimates reflect the ambient PM2.5 attributable to the EGU sector in the 

source apportionment modeling (“sector modeling”) from Fann, Baker, and Fulcher (2012), as 

illustrated in Figures 4A-2 and 4A-3 for 2016. After estimating the PM2.5 benefits for each of the 

analysis years applied in this RIA (i.e., 2020, 2025, and 2030), we aggregated the benefits results 

regionally (i.e., East, West, and California) rather than nationally, as shown in Figure 4A-4. 111

Due to the low emissions of SO2, NOX, and directly emitted particles from EGUs in California 

and the high population density, we separated out California in order not to bias the benefit-perton estimates for the rest of the Western U.S. In order to calculate the benefit-per-ton estimates, 

 

110 The 2016 air quality modeling simulations underlying the benefit-per-ton estimates do not 

reflect emission reductions anticipated from the EGU sector as a result of the recently 

promulgated MATS rule, and so are likely to overstate the total PM2.5 from this sector. (Fann, 

Fulcher, and Baker [2013]). The EGU contribution on a per-ton basis would be similar. Because 

the emission reductions in this RIA are calculated from an IPM base case that includes MATS 

(see Chapter 3), there is no double-counting concern with the resulting co-benefits estimates. 

111 This aggregation is identified as the shapefile “Report Regions” in BenMAP’s grid 

definitions. 
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5-4 

we divided the regional benefits estimates by the corresponding emissions, as shown in Table 

4A-1. Lastly, we adjusted the benefit-per-ton estimates for a currency year of 2011$.112

Figure 4A-2. Modeled PM2.5 Concentrations Attributable to EGUs in 2016 (Annual Mean, 

in μg/m3

) (Source: BPT TSD) 

This method provides estimates of the regional average benefit-per-ton for each ambient 

PM2.5 precursor emitted from EGU sources. For some precursor emissions, such as NOx, there is 

generally a non-linear relationship between emissions and formation of PM2.5. This means that 

each ton of NOx reduced would have a different impact on ambient PM2.5 depending on the 

initial level of emissions and potentially on the levels of emissions of other pollutants. In 

contrast, SO2 is generally linear in forming PM2.5. For non-linear pollutants like NOx, a marginal 

benefit-per-ton approach would better approximate the specific benefits associated with an 

emissions reduction scenario for a given set of base case emissions, but we do not have sufficient 

air quality modeling data to calculate a marginal benefit-per-ton estimates for the EGU sector. 

 

112 Currently, BenMAP does not have an inflation adjustment to 2011$. We ran BenMAP for a currency year of 2010$ and calculated the 

benefit-per-ton estimates in 2010$. We then adjusted the resulting benefit-per-ton estimates to 2011$ using the Consumer Price Index.
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5-5 

Therefore, using an average benefit-per-ton estimate for NOx adds uncertainty to the co-benefits 

estimated in this RIA. Because most of the estimated co-benefits for the proposed guidelines are 

attributable to reductions in SO2 emissions, the added uncertainty is likely to be small. 
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5-6 

Figure 4A-3. Modeled PM2.5 Concentrations Attributable to EGUs by Precursor in 2016 (Annual Mean, in μg/m3) 

a) Sulfate b) Nitrate

c) Elemental Carbon and Organic Carbon d) Crustal PM2.5
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5-7 

Figure 4A-4. Regional Breakdown 

Table 4A-1. Summary of National and Regional Emissions in Sector Modeling for EGUs in 

2016 (in short tons) 

Pollutant National EGU

emissions

Regional EGU Emissions

East West California

SO2 3,793,362 3,520,296 273,070 4,886 

Directly emitted PM2.5 (EC+OC) 30,078 26,172 3,892 1,523 

Directly emitted PM2.5 (crustal) 243,497 214,219 28,438 840 

NOx (all year) 1,826,582 1,425,148 401,584 13,485 

NOx (ozone season) 931,189 728,402 195,748 7,039 

In this RIA, we estimate emission reductions from EGUs using IPM.113 IPM outputs 

provide endogenously projected unit level emissions of SO2, NOx, CO2, Hg, HCl from EGUs, 

but CO, VOC, NH3 and total directly emitted PM2.5 and PM10 emissions are post-calculated.114 In 

addition, directly emitted particle emissions calculated from IPM outputs do not include 

speciation, i.e. they are only the total emissions. In order to estimate the benefits associated with 

 

113 See Chapter 3 of this RIA for additional information regarding IPM.

114 Detailed documentation of this post-processing is available at 

http://www.epa.gov/powersectormodeling/docs/v513/FlatFile_Methodology.pdf 
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5-8 

reduced emissions of directly emitted particles, we must determine the fraction of total PM2.5 

emissions comprised of elemental carbon and organic carbon (EC+OC) and crustal emissions.115

Figure 4A-5 illustrates the relative breakdown of directly emitted PM2.5 components from EGUs 

in the modeling by Fann, Baker, and Fulcher (2012). In this modeling, the national average 

EC+OC fraction of emitted PM2.5 is 10% with a range of 5% to 63% in different states due to the 

different proportion of fuels. The national average is similar to the averages for the east and west 

regions at 10% and 7%, respectively. Only five states had EC+OC fractions greater than 30%. 

For crustal emissions, the national average fraction of emitted PM2.5 from EGUs is 78% with a 

range of 26% to 83%. The national average is similar to the averages for the east and west 

regions at 78% and 81%, respectively. Only four states had crustal fractions less than 50%. 

Figure 4A-5. Breakdown of Directly Emitted PM2.5 Emissions from EGU in Sector 

Modeling 

There are several uncertainties associated with estimating the benefits associated with 

reducing emissions of EC+OC and crustal PM2.5 from EGUs. As previously mentioned, IPM 

does not estimate PM2.5 emissions by component, and total PM2.5 is estimated as an IPM post-

 

115 Crustal emissions are composed of compounds associated with minerals and metals from the 

earth’s surface, including carbonates, silicates, iron, phosphates, copper, and zinc. Often, crustal 

material represents particles not classified as one of the other species (e.g., organic carbon, 

elemental carbon, nitrate, sulfate, chloride, etc.). 

‐

5,000

10,000

15,000

20,000

25,000

Texas

Pennsylvania

Ohio

Indiana

Florida

West Virginia

Georgia

Kentucky

Alabama

North Carolina

South Carolina

Illinois

Minnesota

Missouri

Wyoming

Arizona

Tennessee

Virginia

Michigan

Wisconsin

North Dakota

UtahIowa

NewMexico

Kansas

Oklahoma

Colorado

MarylandNew York

Arkansas

Louisiana

Nevada

California

Nebraska

Montana

New Jersey

Mississippi

Massachusetts

Connecticut

Washington

South Dakota

New Hampshire

Oregon

Delaware

Rhode Island

Maine

Idaho

Emissionsin SectorModeling (Tons)

PNO3 PSO4

POC PEC

PMFINE (crustal)
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5-9 

processing step using emission factors. In order to conduct air quality modeling, PM2.5 from 

EGUs is speciated into components during the emissions modeling process based on emission 

profiles for EGUs by source classification code. Even though these speciation profiles are not 

unit-specific, an emission profile based on the source classification code is highly sophisticated 

and reflects the fuel and the unit configuration. In addition, the air quality model output has been 

adjusted to match an interpolated surface of speciated PM2.5 measurements, using the Model 

Attainment Test Software (Abt Associates, Inc, 2010). Uncertainties in some emissions sectors 

can sometimes be large enough that air quality estimates from well-characterized sectors such as 

EGUs may be changed to match observed monitor data. While these changes are usually 

minimal, in this instance, uncertainties in crustal emissions from other sectors impact the 

relationship between EGU crustal emissions and resulting air quality impacts. Because the cobenefits associated with directly emitted particles for the proposed guidelines are small relative 

to the co-benefits of reducing SO2 emissions, these uncertainties would not substantially affect 

the estimate of total monetized health co-benefits.116 In calculating the PM2.5 co-benefits in this 

RIA, we estimate the emission reductions of EC+OC and crustal emissions by applying the 

national average fractions (i.e., 78% crustal and 10% EC+OC) to the emission reductions of all 

directly emitted particles from EGUs. Because the benefit-per-ton estimates for reducing 

emissions of EC+OC are larger than the benefit-per-ton estimate for crustal emissions, this 

assumption underestimates the monetized PM2.5 co-benefits in certain states with higher EC+OC 

fractions, such as California and North Dakota. We further underestimate the co-benefits by not 

quantifying or monetizing the co-benefits associated with reducing directly emitted particulate 

nitrate and sulfate. 

Although it is possible to calculate 95th percentile confidence intervals using the approach 

described in this appendix (e.g., U.S. EPA, 2011b), we generally do not calculate confidence 

intervals for benefit-per-ton estimates. Instead, we refer the reader to Chapter 5 of PM NAAQS 

RIA (U.S. EPA, 2012a) for an indication of the combined random sampling error in the health 

impact and economic valuation functions using Monte Carlo methods. In general, the 95th

percentile confidence interval for the total monetized PM2.5 benefits ranges from approximately90% to +180% of the central estimates based on concentration-response functions from Krewski 

 

116 See Figure 5-2 of this RIA for the relative proportion of health co-benefits from directly 

emitted particles relative to co-benefits from SO2 emissions. 
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5-10 

et al. (2009) and Lepeule et al. (2012). The 95th percentile confidence interval for the health 

impact function alone ranges from approximately ±30% for mortality incidence based on 

Krewski et al. (2009) and ±46% based on Lepeule et al. (2012). These confidence intervals do 

not reflect other sources of uncertainty inherent within the estimates, such as baseline incidence 

rates, populations exposed, and transferability of the effect estimate to diverse locations. As a 

result, the reported confidence intervals and range of estimates give an incomplete picture about 

the overall uncertainty in the benefits estimates. 

Tables 4A-2 through 4A-4 provide the national and regional benefit-per-ton estimates for 

the EGU sector at discount rates of 3% and 7% in 2020, 2025, and 2030 respectively. Tables 4A5 through 4A-7 provide the incidence per ton estimates for the EGU sector in 2020, 2025, and 

2030 respectively. 
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5-11 

Table 4A-2. Summary of National and Regional PM2.5 Benefit-per-Ton Estimates for EGUs in 2020 (2011$)* 

Pollutant Discount Rate National Region East West California

SO2 3% $38,000 to $86,000 $40,000 to $90,000 $7,800 to $18,000 $160,000 to $360,000 7% $34,000 to $77,000 $36,000 to $82,000 $7,100 to $16,000 $140,000 to $320,000 

Directly emitted 

PM2.5 (EC+OC) 

3% $140,000 to $320,000 $140,000 to $320,000 $56,000 to $130,000 $280,000 to $640,000 

7% $130,000 to $290,000 $130,000 to $280,000 $50,000 to $110,000 $250,000 to $570,000 

Directly emitted 

PM2.5 (Crustal) 

3% $18,000 to $40,000 $18,000 to $41,000 $11,000 to $25,000 $110,000 to $240,000 

7% $16,000 to $36,000 $16,000 to $37,000 $10,000 to $23,000 $95,000 to $220,000 

NOx (as PM2.5) 3% $5,600 to $13,000 $6,700 to $15,000 $1,200 to $2,600 $17,000 to $38,000 7% $5,000 to $11,000 $6,000 to $14,000 $1,000 to $2,400 $15,000 to $34,000 

* The range of estimates reflects the range of epidemiology studies for avoided premature mortality for PM2.5. All estimates are rounded to two significant figures. All fine 

particles are assumed to have equivalent health effects, but the benefit per ton estimates vary depending on the location and magnitude of their impact on PM2.5 levels, 

which drive population exposure. The monetized benefits incorporate the conversion from precursor emissions to ambient fine particles. The estimates do not include 

reduced health effects from direct exposure to ozone, NO2, SO2, ecosystem effects, or visibility impairment. 

Table 4A-3. Summary of National and Regional PM2.5 Benefit-per-Ton Estimates for EGUs in 2025 (2011$)* 

Pollutant Discount Rate National Region East West California

SO2 3% $41,000 to $93,000 $44,000 to $98,000 $8,800 to $20,000 $180,000 to $410,000 7% $37,000 to $84,000 $39,000 to $89,000 $8,000 to $18,000 $160,000 to $370,000 

Directly emitted 

PM2.5 (EC+OC) 

3% $150,000 to $350,000 $150,000 to $340,000 $64,000 to $140,000 $320,000 to $720,000 

7% $140,000 to $310,000 $140,000 to $310,000 $58,000 to $130,000 $290,000 to $650,000 

Directly emitted 

PM2.5 (Crustal) 

3% $17,000 to $39,000 $18,000 to $40,000 $12,000 to $27,000 $43,000 to $96,000 7% $15,000 to $35,000 $16,000 to $36,000 $11,000 to $24,000 $38,000 to $87,000 

NOx (as PM2.5) 3% $6,000 to $14,000 $7,200 to $16,000 $1,300 to $2,900 $19,000 to $42,000 7% $5,400 to $12,000 $6,500 to $15,000 $1,200 to $2,600 $17,000 to $38,000 

* The range of estimates reflects the range of epidemiology studies for avoided premature mortality for PM2.5. All estimates are rounded to two significant figures. All fine 

particles are assumed to have equivalent health effects, but the benefit per ton estimates vary depending on the location and magnitude of their impact on PM2.5 levels, 

which drive population exposure. The monetized benefits incorporate the conversion from precursor emissions to ambient fine particles. The estimates do not include 

reduced health effects from direct exposure to ozone, NO2, SO2, ecosystem effects, or visibility impairment. 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review***

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Table 4A-4. Summary of National and Regional PM2.5 Benefit-per-Ton Estimates for EGUs in 2030 (2011$)* 

Pollutant Discount Rate National Region East West California

SO2 3% $44,000 to $100,000 $47,000 to $110,000 $9,800 to $22,000 $200,000 to $450,000 7% $40,000 to $90,000 $42,000 to $95,000 $8,800 to $20,000 $180,000 to $410,000 

Directly emitted PM2.5 (EC+OC) 

3% $170,000 to $370,000 $160,000 to $370,000 $71,000 to $160,000 $360,000 to $800,000 7% $150,000 to $340,000 $150,000 to $330,000 $64,000 to $150,000 $320,000 to $730,000 

Directly emitted PM2.5 (Crustal) 

3% $18,000 to $42,000 $19,000 to $43,000 $13,000 to $30,000 $47,000 to $110,000 7% $17,000 to $38,000 $17,000 to $38,000 $12,000 to $27,000 $43,000 to $96,000 

NOx (as PM2.5) 3% $6,400 to $14,000 $7,600 to $17,000 $1,400 to $3,200 $21,000 to $42,000 7% $5,800 to $13,000 $6,900 to $16,000 $1,300 to $2,900 $19,000 to $47,000 

* The range of estimates reflects the range of epidemiology studies for avoided premature mortality for PM2.5. All estimates are rounded to two significant figures. All fine 

particles are assumed to have equivalent health effects, but the benefit per ton estimates vary depending on the location and magnitude of their impact on PM2.5 levels, 

which drive population exposure. The monetized benefits incorporate the conversion from precursor emissions to ambient fine particles. The estimates do not include 

reduced health effects from direct exposure to ozone, NO2, SO2, ecosystem effects, or visibility impairment. 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review***

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Table 4A-5. Summary of Regional PM2.5 Incidence-per-Ton Estimates for EGUs in 2020* 

Health Endpoint 

East West California 

SO2 NOx EC+OC Crustal SO2 NOx EC+OC Crustal SO2 NOx EC+OC Crustal 

Premature Mortality 

Krewski et al. (2009) – adult 0.004400 0.000730 0.015000 0.002000 0.000860 0.000130 0.006100 0.001200 0.017000 0.001800 0.031000 0.012000Lepeule et al. (2012) – adult 0.009900 0.001700 0.035000 0.004500 0.001900 0.000290 0.014000 0.002800 0.039000 0.004100 0.070000 0.026000

Woodruff et al. (1997) – infants 0.000010 0.000002 0.000033 0.000004 0.000002 0.000000 0.000016 0.000003 0.000036 0.000004 0.000067 0.000025

Morbidity 

Emergency department visits for asthma 0.002300 0.000410 0.008700 0.001000 0.000380 0.000055 0.002800 0.000520 0.008600 0.001000 0.016000 0.005900Acute bronchitis 0.006300 0.001100 0.022000 0.002800 0.001600 0.000330 0.011000 0.002300 0.031000 0.003400 0.057000 0.021000Lower respiratory symptoms 0.081000 0.014000 0.290000 0.036000 0.021000 0.004200 0.150000 0.029000 0.390000 0.044000 0.720000 0.270000Upper respiratory symptoms 0.120000 0.020000 0.410000 0.051000 0.030000 0.006000 0.210000 0.042000 0.560000 0.062000 1.000000 0.390000Minor restricted-activity days 3.200000 0.540000 11.000000 1.400000 0.780000 0.130000 5.400000 1.000000 16.00000 1.700000 29.00000 11.00000Lost work days 0.540000 0.090000 1.900000 0.240000 0.130000 0.023000 0.910000 0.180000 2.700000 0.290000 4.900000 1.800000Asthma exacerbation 0.290000 0.020000 0.420000 0.053000 0.074000 0.006200 0.220000 0.043000 1.400000 0.064000 1.100000 0.400000Hospital Admissions, Respiratory 0.001300 0.000220 0.004500 0.000580 0.000190 0.000026 0.001400 0.000270 0.004100 0.000440 0.007400 0.002800Hospital Admissions, Cardiovascular 0.001600 0.000270 0.005600 0.000720 0.000220 0.000032 0.001800 0.000340 0.005000 0.000520 0.009000 0.003400Non-fatal Heart Attacks (Peters) 0.005000 0.000860 0.018000 0.002300 0.000810 0.000110 0.006000 0.001200 0.018000 0.001900 0.032000 0.012000Non-fatal Heart Attacks (All others) 0.000550 0.000093 0.001900 0.000250 0.000087 0.000012 0.000640 0.000130 0.001900 0.000210 0.003400 0.001300

* All estimates are rounded to two significant figures. All fine particles are assumed to have equivalent health effects, but the incidence-per-ton estimates vary depending on 

the location and magnitude of their impact on PM2.5 levels, which drive population exposure. The incidence benefit-per-ton estimates incorporate the conversion from 

precursor emissions to ambient fine particles. 
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Table 4A-6. Summary of Regional PM2.5 Incidence-per-Ton Estimates for EGUs in 2025* 

Health Endpoint 

East West California 

SO2 NOx EC+OC Crustal SO2 NOx EC+OC Crustal SO2 NOx EC+OC Crustal 

Premature Mortality 

Krewski et al. (2009) – adult 0.004700 0.000770 0.016000 0.002100 0.000940 0.000140 0.006800 0.001400 0.019000 0.002000 0.034000 0.013000Lepeule et al. (2012) – adult 0.011000 0.001700 0.037000 0.004800 0.002100 0.000310 0.015000 0.003100 0.043000 0.004500 0.077000 0.029000

Woodruff et al. (1997) – infants 0.000009 0.000001 0.000031 0.000004 0.000002 0.000000 0.000016 0.000003 0.000034 0.000004 0.000063 0.000024

Morbidity 

Emergency department visits for asthma 0.002400 0.000420 0.009000 0.001100 0.000410 0.000059 0.003000 0.000560 0.009000 0.001000 0.016000 0.006100Acute bronchitis 0.006600 0.001100 0.023000 0.002900 0.001700 0.000350 0.012000 0.002400 0.032000 0.003600 0.059000 0.022000Lower respiratory symptoms 0.084000 0.014000 0.300000 0.037000 0.022000 0.004400 0.150000 0.031000 0.410000 0.046000 0.760000 0.290000Upper respiratory symptoms 0.120000 0.020000 0.430000 0.053000 0.032000 0.006300 0.220000 0.044000 0.590000 0.065000 1.100000 0.410000Minor restricted-activity days 3.200000 0.540000 12.000000 1.400000 0.820000 0.140000 5.700000 1.100000 16.00000 1.70000 30.00000 11.00000Lost work days 0.550000 0.091000 2.000000 0.240000 0.140000 0.024000 0.970000 0.190000 2.700000 0.300000 5.000000 1.800000Asthma exacerbation 0.300000 0.021000 0.440000 0.055000 0.078000 0.006500 0.230000 0.046000 1.400000 0.067000 1.100000 0.420000Hospital Admissions, Respiratory 0.001400 0.000240 0.005000 0.000640 0.000220 0.000030 0.001600 0.000320 0.004800 0.000500 0.008500 0.003200Hospital Admissions, Cardiovascular 0.001800 0.000290 0.006100 0.000780 0.000250 0.000036 0.002000 0.000390 0.005600 0.000580 0.010000 0.003800Non-fatal Heart Attacks (Peters) 0.005500 0.000930 0.019000 0.002500 0.000910 0.000120 0.006800 0.001300 0.020000 0.002100 0.036000 0.013000Non-fatal Heart Attacks (All others) 0.000600 0.000100 0.002100 0.000270 0.000098 0.000013 0.000730 0.000140 0.002200 0.000230 0.003900 0.001500

* All estimates are rounded to two significant figures. All fine particles are assumed to have equivalent health effects, but the incidence-per-ton estimates vary depending on 

the location and magnitude of their impact on PM2.5 levels, which drive population exposure. The incidence benefit-per-ton estimates incorporate the conversion from 

precursor emissions to ambient fine particles. 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review***

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Table 4A-7. Summary of Regional PM2.5 Incidence-per-Ton Estimates for EGUs in 2030* 

Health Endpoint 

East West California 

SO2 NOx EC+OC Crustal SO2 NOx EC+OC Crustal SO2 NOx EC+OC Crustal 

Premature Mortality 0.005000 0.000810 0.017000 0.002300 0.001000 0.000150 0.007600 0.001500 0.021000 0.002200 0.038000 0.014000

Krewski et al. (2009) – adult 0.011000 0.001800 0.040000 0.005100 0.002400 0.000340 0.017000 0.003400 0.048000 0.005000 0.086000 0.032000Lepeule et al. (2012) – adult 0.000009 0.000001 0.000030 0.000004 0.000002 0.000000 0.000015 0.000003 0.000032 0.000004 0.000060 0.000023

Woodruff et al. (1997) – infants 

Morbidity 0.002500 0.000430 0.009300 0.001100 0.000430 0.000062 0.003200 0.000600 0.009400 0.001100 0.017000 0.006400

Emergency department visits for asthma 0.006800 0.001100 0.024000 0.003000 0.001800 0.000370 0.013000 0.002600 0.033000 0.003700 0.061000 0.023000Acute bronchitis 0.087000 0.014000 0.310000 0.038000 0.023000 0.004700 0.170000 0.033000 0.420000 0.047000 0.780000 0.300000Lower respiratory symptoms 0.130000 0.021000 0.440000 0.055000 0.034000 0.006700 0.240000 0.047000 0.610000 0.067000 1.100000 0.420000Upper respiratory symptoms 3.300000 0.540000 12.000000 1.500000 0.860000 0.150000 6.000000 1.200000 17.00000 1.800000 30.00000 11.00000Minor restricted-activity days 0.560000 0.092000 2.000000 0.250000 0.150000 0.025000 1.000000 0.200000 2.800000 0.300000 5.100000 1.900000Lost work days 0.310000 0.021000 0.460000 0.057000 0.082000 0.006900 0.240000 0.048000 1.500000 0.069000 1.200000 0.430000Asthma exacerbation 0.001600 0.000260 0.005500 0.000710 0.000250 0.000034 0.001800 0.000360 0.005500 0.000580 0.009900 0.003700Hospital Admissions, Respiratory 0.001900 0.000320 0.006700 0.000850 0.000280 0.000041 0.002300 0.000440 0.006400 0.000660 0.012000 0.004300Hospital Admissions, Cardiovascular 0.006000 0.001000 0.021000 0.002700 0.001000 0.000140 0.007700 0.001500 0.023000 0.002400 0.041000 0.015000Non-fatal Heart Attacks (Peters) 0.000660 0.000110 0.002300 0.000290 0.000110 0.000015 0.000830 0.000160 0.002500 0.000260 0.004400 0.001700Non-fatal Heart Attacks (All others) 0.005000 0.000810 0.017000 0.002300 0.001000 0.000150 0.007600 0.001500 0.021000 0.002200 0.038000 0.014000

* All estimates are rounded to two significant figures. All fine particles are assumed to have equivalent health effects, but the incidence-per-ton estimates vary depending on 

the location and magnitude of their impact on PM2.5 levels, which drive population exposure. The incidence benefit-per-ton estimates incorporate the conversion from 

precursor emissions to ambient fine particles. 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review***

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4A.4 Regional Ozone Benefit-per-Ton Estimates 

The process for generating the regional ozone benefit-per-ton estimates is consistent with 

the process for PM2.5. The key difference is substituting the ozone impacts from EGUs in the 

sector modeling for the PM2.5 impacts. We have not historically generated ozone benefit-per-ton 

estimates due to the complex non-linearity in the atmospheric response to changes in ozone 

precursor pollutants from different sectors in different geographic areas. However, for EGUs, we 

have increased confidence in the magnitude and location of ozone-season NOx emissions and 

ambient ozone concentrations attributable to these emissions. In addition, the sector modeling 

provides information regarding the total EGU contribution to ozone formation, which provides 

greater transferability than an air quality modeling scenario for a regulation that might include 

both increases and decreases in emissions in different locations. Figure 4A-6 provides the 

average ambient ozone concentrations from the EGU sector in the sector modeling for 2016.117

 

117 The 2016 air quality modeling simulations do not reflect emission reductions anticipated from 

the EGU sector as a result of the recently promulgated MATS rule, and so may overstate the total 

ozone contribution from this sector. (Fann, Fulcher, and Baker (2013). However, the EGU 

contribution on a per-ton basis would likely be similar. Because the emission reductions in this 

RIA are calculated from an IPM base case that includes MATS (see Chapter 3), there is no 

double-counting concern with the resulting co-benefits estimates. 
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Figure 4A-6. Modeled Average Ozone Concentrations Attributable to EGUs in 2016 (Daily 

8-hour maximum, May-September, in ppb) 

We assume that all of the ozone impacts from EGUs are attributable to NOx emissions. 

VOC emissions, which are also a precursor to ambient ozone formation, are insignificant from 

the EGU sector relative to NOx emissions from EGUs and the total VOC emissions inventory. 

Therefore, we believe that our assumption that EGU-attributable ozone formation at the regionallevel is due to NOx alone is reasonable. 

Similar to PM2.5, this method provides estimates of the regional average benefit-per-ton. 

Due to the non-linear chemistry between NOx emissions and ambient ozone, using an average 

benefit-per-ton estimate for NOx adds uncertainty to the ozone co-benefits estimated for the 

proposed guidelines. Because most of the estimated co-benefits for the proposed guidelines are 

attributable to changes in ambient PM2.5, the added uncertainty is likely to be small. 

In the ozone co-benefits estimated in this RIA, we apply the benefit-per-ton estimates 

calculated using NOX emissions from U.S. EGUs during the ozone-season only (May to 

September). As shown in Table 4A-1, ozone-season NOx emissions from EGUs are 

approximately half of all-year NOX emissions. Because we estimate ozone health impacts from 

May to September only, this approach underestimates ozone co-benefits in areas with a longer 

ozone seasons such as southern California and Texas. When the underestimated benefit-per-ton 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review***

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estimate is multiplied by ozone-season only NOx emission reductions, this results in an 

underestimate of the monetized ozone co-benefits. For illustrative purposes, Tables 4A-8 through 

4A-10 provide the ozone benefit-per-ton estimates using both all-year NOx emissions and ozoneseason only NOx for 2020, 2025, and 2030, respectively. Tables 4A-11 through 4A-13 provide 

the ozone season incidence-per-ton estimates for 2020, 2025, and 2030, respectively. 

Table 4A-8. Summary of National and Regional Ozone Benefit-per-Ton Estimates for 

EGUs in 2020 (2011$)* 

Ozone precursor

Pollutant National Regional

East West California

Ozone season NOx $3,800 to $16,000 $4,600 to $19,000 $930 to $4,000 $7,400 to $31,000 

All-year NOx $1,900 to $8,000 $2,300 to $9,600 $450 to $2,000 $3,800 to $16,000

* The range of estimates reflects the range of epidemiology studies for avoided premature mortality for ozone. All 

estimates are rounded to two significant figures. The monetized benefits incorporate the conversion from NOx 

precursor emissions to ambient ozone. 

Table 4A-9. Summary of National and Regional Ozone Benefit-per-Ton Estimates for 

EGUs in 2025 (2011$)* 

Ozone precursor

Pollutant National Regional

East West California

Ozone season NOx $4,900 to $21,000 $5,900 to $25,000 $1,200 to $5,400 $9,900 to $42,000 

All-year NOx $2,500 to $11,000 $3,000 to $13,000 $650 to $2,800 $5,200 to $22,000 

* The range of estimates reflects the range of epidemiology studies for avoided premature mortality for ozone. All 

estimates are rounded to two significant figures. The monetized benefits incorporate the conversion from NOx 

precursor emissions to ambient ozone. 

Table 4A-10. Summary of National and Regional Ozone Benefit-per-Ton Estimates for 

EGUs in 2030 (2011$)* 

Ozone precursor

Pollutant National Regional

East West California

Ozone season NOx $5,300 to $23,000 $6,300 to $27,000 $1,400 to $6,000 $11,000 to $47,000 

All-year NOx $2,700 to $12,000 $3,200 to $14,000 $730 to $3,200 $5,700 to $25,000 

* The range of estimates reflects the range of epidemiology studies for avoided premature mortality for ozone. All 

estimates are rounded to two significant figures. The monetized benefits incorporate the conversion from NOx 

precursor emissions to ambient ozone. 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review***

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Table 4A-11. Summary of Regional Ozone Incidence-per-Ton Estimates for EGUs in 2020*

Health Endpoint East West California 

Premature Mortality – adult 

Bell et al. (2004) 0.000260 0.000053 0.000420 

Levy et al. (2005) 0.001200 0.000250 0.001900 

Morbidity 

Hospital Admissions, Respiratory (ages > 65) 0.001600 0.000250 0.002200 

Hospital Admissions, Respiratory (ages < 2) 0.000710 0.000220 0.001200 

Emergency Room Visits, Respiratory 0.000840 0.000150 0.001300 

Acute Respiratory Symptoms 1.500000 0.380000 3.000000 

School Loss Days 0.510000 0.140000 1.000000 

* All estimates are rounded to two significant figures. The incidence benefit-per-ton estimates incorporate the 

conversion from NOx precursor emissions to ambient ozone. These estimates reflect ozone-season NOx 

emissions. 

Table 4A-12. Summary of Regional Ozone Incidence-per-Ton Estimates for EGUs in 2025*

Health Endpoint East West California 

Premature Mortality – adult 

Bell et al. (2004) 0.000530 0.000110 0.000890 

Levy et al. (2005) 0.002400 0.000520 0.004100 

Morbidity 

Hospital Admissions, Respiratory (ages > 65) 0.003500 0.000590 0.004900 

Hospital Admissions, Respiratory (ages < 2) 0.001400 0.000440 0.002300 

Emergency Room Visits, Respiratory 0.001700 0.000300 0.002700 

Acute Respiratory Symptoms 3.000000 0.770000 5.900000 

School Loss Days 1.000000 0.290000 2.100000 

* All estimates are rounded to two significant figures. The incidence benefit-per-ton estimates incorporate the 

conversion from NOx precursor emissions to ambient ozone. These estimates reflect ozone-season NOx 

emissions. 

Table 4A-13. Summary of Regional Ozone Incidence-per-Ton Estimates for EGUs in 2030*

Health Endpoint East West California 

Premature Mortality – adult 

Bell et al. (2004) 0.000570 0.000130 0.001000 

Levy et al. (2005) 0.002600 0.000580 0.004500 

Morbidity 

Hospital Admissions, Respiratory (ages > 65) 0.004000 0.000690 0.005900 

Hospital Admissions, Respiratory (ages < 2) 0.001400 0.000460 0.002400 

Emergency Room Visits, Respiratory 0.001800 0.000320 0.002800 

Acute Respiratory Symptoms 3.000000 0.810000 6.000000 

School Loss Days 1.100000 0.310000 2.200000 

* All estimates are rounded to two significant figures. The incidence benefit-per-ton estimates incorporate the 

conversion from NOx precursor emissions to ambient ozone. These estimates reflect ozone-season NOx 

emissions. 

4A.5 Evaluating the Benefit-per-Ton Estimates 

In this section, we provide information that can be used to evaluate the regional benefitper-ton estimates and provide some characterization of the uncertainty inherent in these estimates 

relative to benefits estimated using scenario-specific air quality modeling. First, we evaluated 
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review***

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how well the spatial distribution of emissions underlying the regional benefit-per-ton estimates 

match the spatial distribution of the emissions for the illustrative compliance scenarios for the 

proposed guidelines. Second, we evaluated how well the national and regional benefit-per-ton 

estimates predicted modeled benefits estimated for MATS (U.S. EPA, 2011b) and CSAPR (U.S. 

EPA, 2011c). 

For the first evaluation, we provide graphs of the EGU emissions in each state in the 

sector modeling base case used to generate the regional benefit-per-ton estimates and the 

emissions in the IPM base case for this RIA, as shown in Figures 4A-7 through 4A-9. It is 

important to note that these graphs do not show the emission reductions anticipated from 

implementation of the proposed guidelines. Rather, these graphs illustrate the similarities and 

differences in the spatial distribution of the emissions from the EGU sector from the different 

base cases in order to evaluate the potential uncertainty associated with using the benefit-per-ton 

estimates to estimate the health co-benefits of the proposed guidelines. As noted in section 4A-2 

above, the sector modeling base case does not reflect emission reductions anticipated from the 

EGU sector as a result of the recently promulgated MATS rule,118 but the IPM base case does 

reflect those emission reductions. Even though the sector modeling has substantially more SO2

emissions from EGUs (3.8 million tons in 2016 vs. 1.5 million tons in 2020), the spatial 

distribution is relatively similar across states and thus the resulting benefit-per-ton would likely 

be similar. Therefore, we would not expect this difference to have a substantial effect on the 

resulting co-benefits estimated for the proposed guidelines. Base case emissions for annual NOx 

and ozone-season NOx are also reasonably similar. 

 

118 See Figure 5C-1 from the MATS RIA (U.S. EPA, 2011b) for more information regarding the 

state-level SO2 emission reductions anticipated from MATS. 
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Figure 4A-7. Comparison of Base Case SO2 Emissions in 2020 

 ‐

50,000

100,000150,000200,000250,000300,000350,000400,000450,000

Alabama

Arizona

Arkansas

California

Colorado

Connecticut

Delaware

District of Columbia

Florida

Georgia

Idaho

Illinois

Indiana

Iowa

Kansas

Kentucky

Louisiana

Maine

Maryland

Massachusetts

Michigan

Minnesota

Mississippi

Missouri

Montana

Nebraska

Nevada

New Hampshire

New Jersey

New Mexico

New York

North Carolina

North Dakota

Ohio

Oklahoma

Oregon

Pennsylvania

Rhode Island

South Carolina

South Dakota

Tennessee

Texas

Utah

Vermont

Virginia

Washington

West Virginia

Wisconsin

Wyoming

Tons

EGU sector air quality modeling base caseIPM base case for this RIA
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Figure 4A-8. Comparison of Base Case Annual NOx Emissions in 2020 

 ‐

20,00040,00060,00080,000

100,000120,000140,000160,000

Alabama

Arizona

Arkansas

California

Colorado

Connecticut

Delaware

District of Columbia

Florida

Georgia

Idaho

Illinois

Indiana

Iowa

Kansas

Kentucky

Louisiana

Maine

Maryland

Massachusetts

Michigan

Minnesota

Mississippi

Missouri

Montana

Nebraska

Nevada

New Hampshire

New Jersey

New Mexico

New York

North Carolina

North Dakota

Ohio

Oklahoma

Oregon

Pennsylvania

Rhode Island

South Carolina

South Dakota

Tennessee

Texas

Utah

Vermont

Virginia

Washington

West Virginia

Wisconsin

Wyoming

Tons

EGU sector air quality modeling base caseIPM base case for this RIA
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review***

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Figure 4A-9. Comparison of Base Case Ozone-season NOx Emissions in 2020 

 ‐

10,00020,00030,00040,00050,00060,00070,00080,000

Alabama

Arizona

Arkansas

California

Colorado

Connecticut

Delaware

District of Columbia

Florida

Georgia

Idaho

Illinois

Indiana

Iowa

Kansas

Kentucky

Louisiana

Maine

Maryland

Massachusetts

Michigan

Minnesota

Mississippi

Missouri

Montana

Nebraska

Nevada

New Hampshire

New Jersey

New Mexico

New York

North Carolina

North Dakota

Ohio

Oklahoma

Oregon

Pennsylvania

Rhode Island

South Carolina

South Dakota

Tennessee

Texas

Utah

Vermont

Virginia

Washington

West Virginia

Wisconsin

Wyoming

Tons

EGU sector air quality modeling base caseIPM base case for this RIA
***E.O. 12866 Review – Draft – Do Not Cite, Quote or Release During Review***

5-1 

For the second evaluation, we used the national and regional benefit-per-ton estimates to 

estimate the modeled sulfate benefits estimated for MATS and CSAPR.119 We focused on sulfate 

because the vast majority of PM2.5 benefits for both rules were from reductions in ambient 

sulfate. We found that the national benefit-per-ton estimates overestimated the modeled CSAPR 

benefits by 7 percent and the MATS benefits by 33 percent. The regional benefit-per-ton 

estimates overestimated the CSAPR benefits by 14 percent and MATS benefits by 29 percent. 

This evaluation shows that the national and regional benefit-per-ton estimates perform 

reasonably well, with a slight overestimate, but this does not mean that the co-benefits estimated 

for the proposed guidelines would necessarily be within a similar range. 

We also evaluated whether available modeling information could be used to generate 

reliable state-level benefit-per-ton estimates for PM2.5.

120 In general, we would expect state-level 

estimates to better reflect the spatial differences in emission reductions and associated health 

impacts across scenarios than regional estimates, which implicitly assume a constant percentage 

of emission reductions across the region. Varying percentage reductions across states are further 

magnified by spatial differences in population density, base case health incidence rates, air 

quality response, and interstate pollution transport. 

We tested several methods for generating state-level benefit-per-ton estimates. The 

method that performed best used state-by-state contribution modeling in the Eastern U.S. 

conducted for CSAPR (U.S. EPA, 2011a) to adjust the regional benefit-per-ton estimates for the 

EGU sector. Although the CSAPR modeling is the best available for estimating state-level 

benefit-per-ton estimates, it zeroed-out all anthropogenic emission sources within a state rather 

than just zeroing-out the emissions from the EGU sector alone. Currently, we do not have air 

quality modeling that provides information regarding the PM2.5 response to EGU only emissions 

for each state separately. We evaluated the performance of the state-level estimates by 

 

119 The benefits analyses for both the MATS and CSAPR RIAs relied on benefit-per-ton 

estimates generated from similar policy-specific air quality modeling conducted specifically 

for those rulemakings. For this evaluation, we compared the benefits estimated from the air 

quality modeling, not the benefits estimated for the final rules in the RIA generated using the 

benefit-per-ton estimates for those rulemakings. 

120 We did not attempt to generate state-level ozone benefit-per-ton estimates due to inter-state 

transport, complex atmospheric chemistry, and localized impacts from VOC emissions. 
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comparing the modeled benefits for two previous rulemakings (i.e., CSAPR and MATS) to the 

benefits estimated using state-level benefit-per-ton. When we evaluated the state-level estimates 

in the same manner as the national and regional estimates, we found that the state-level estimates 

performed similarly, in general, to the regional estimates for estimating total national benefits but 

were unreliable in estimating the benefits that would accrue to each state. In addition, because 

the spatial differences in emission reductions between the options evaluated in this RIA are 

small, using the state-level estimates did not make a difference in the relative co-benefits across 

options. 

 
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4A.6 References 

Abt Associates, Inc. 2010. “User’s Guide: Modeled Attainment Test Software.” Available at: 

<http://www.epa.gov/scram001/modelingapps_mats.htm>. 

Abt Associates, Inc. 2012. “BenMAP User’s Manual Appendices,” prepared for U.S. Research 

Triangle Park, NC: U. S. Environmental Protection Agency, Office of Air Quality Planning 

and Standards. Available at: 

<http://www.epa.gov/air/benmap/models/BenMAPAppendicesOct2012.pdf>. 

Bell, M.L., et al. 2004. “Ozone and Short-Term Mortality in 95 U.S. Urban Communities, 1987-

2000.” Journal of the American Medical Association, 292(19): pp. 2372-8. 

Bell, M.L.; F. Dominici and J.M. Samet. 2005. “A Meta-Analysis of Time-Series Studies of 

Ozone and Mortality with Comparison to the National Morbidity, Mortality, and Air Pollution 

Study.” Epidemiology. 16(4): pp. 436-45. 

Fann, N.; C.M. Fulcher and B.J. Hubbell. 2009. “The Influence of Location, Source, and 

Emission Type in Estimates of the Human Health Benefits of Reducing a Ton of Air 

Pollution.” Air Quality and Atmospheric Health, 2:169–176. 

Fann, N.; K.R. Baker and C.M. Fulcher. 2012. “Characterizing the PM2.5-Related Health 

Benefits of Emission Reductions for 17 Industrial, Area and Mobile Emission Sectors Across 

the U.S.” Environment International, 49 41–151. 

Fann, N.; K.R. Baker and C.M. Fulcher. 2013. “The Recent and Future Health Burden of Air 

Pollution Apportioned Across 23 U.S. Sectors.” Environmental Scientific Technology, 47 (8) 

(2013), pp. 3580–3589. 

Huang Y.; F. Dominici and M. Bell. 2005. “Bayesian Hierarchical Distributed Lag Models for 

Summer Ozone Exposure and Cardio-Respiratory Mortality.” Environmetrics, 16, 547-562. 

Ito, K.; S.F. De Leon and M. Lippmann. 2005. “Associations Between Ozone and Daily 

Mortality: Analysis and Meta-Analysis.” Epidemiology, 16(4): p. 446-57. 

Krewski D.; M. Jerrett; R.T. Burnett; R. Ma; E. Hughes; Y. Shi, et al. 2009. Extended Follow-Up 

and Spatial Analysis of the American Cancer Society Study Linking Particulate Air Pollution 

and Mortality. HEI Research Report, 140, Health Effects Institute, Boston, MA. 

Lepeule, J.; F. Laden; D. Dockery and J. Schwartz. 2012. “Chronic Exposure to Fine Particles 

and Mortality: An Extended Follow-Up of the Harvard Six Cities Study from 1974 to 2009.” 

Environmental Health Perspective, Jul; 120(7):965-70. 

Levy, J.I.; S.M. Chemerynski and J.A. Sarnat. 2005. “Ozone Exposure and Mortality: An 

Empiric Bayes Metaregression Analysis.” Epidemiology, 16(4): pp. 458-68. 

Roman, H.A.; K. D. Walker; T. L. Walsh; L. Conner; H. M. Richmond; B. J. Hubbell and P. L. 

Kinney. 2008. “Expert Judgment Assessment of the Mortality Impact of Changes in Ambient 

Fine Particulate Matter in the U.S.” Environmental Scientific Technology, 42(7):2268-2274. 

Schwartz, J. 2005. “How Sensitive is the Association Between Ozone and Daily Deaths to 

Control for Temperature?” American Journal of Respiratory and Critical Care Medicine, Vol. 

171 (6): 627-31. 
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5-4 

U.S. Environmental Protection Agency. 1998. Regulatory Impact Analysis for the NOx SIP Call, 

FIP, and Section 126 Petitions. (EPA document number EPA-452/R-98-003). Available at: 

<http://http://www.epa.gov/ttn/oarpg/otag/sipriav2.zip>. 

U.S. EPA. 2005. “2005 National Emissions Inventory Data & Documentation.” Available at: 

<http://www.epa.gov/ttnchie1/net/2005inventory.html>. 

U.S. EPA. 2010. Regulatory Impact Analysis for the Proposed Federal Transport Rule. (EPA 

document number EPA-HQ-OAR-2009-0491). Research Triangle Park, NC. Available at: 

<http://www.epa.gov/ttn/ecas/regdata/RIAs/proposaltrria_final.pdf>. 

U.S. EPA. 2011a. “Air Quality Modeling Final Rule Technical Support Document [Cross-State 

Rule].” Research Triangle Park, NC: Office of Air Quality Planning and Standards, Air 

Quality Assessment Division, June. Available on the Internet at: 

<http://www.epa.gov/crossstaterule/pdfs/AQModeling.pdf >. 

U.S. EPA. 2011b. Regulatory Impact Analysis for the Final Mercury and Air Toxics Standards. 

Research Triangle Park, NC: Office of Air Quality Planning and Standards, Health and 

Environmental Impacts Division. (EPA document number EPA-452/R-11-011, December). 

Available at <http://www.epa.gov/ttn/ecas/regdata/RIAs/matsriafinal.pdf>. 

U.S. EPA. 2011c. “Regulatory Impact Analysis (RIA) for the Final Transport Rule.” Research 

Triangle Park: Office of Air and Radiation, July. Available at: 

<http://www.epa.gov/airtransport/pdfs/FinalRIA.pdf>. 

U.S. EPA. 2011d. “Air Quality Modeling Technical Support Document: Source Sector 

Assessments.” Research Triangle Park, NC. Available at: 

<http://www.epa.gov/scram001/reports/EPA454_R11_006.pdf>. 

U.S. EPA. 2012a. “Regulatory Impact Analysis for the Final Revisions to the National Ambient 

Air Quality Standards for Particulate Matter.” Research Triangle Park, NC: Office of Air 

Quality Planning and Standards, Health and Environmental Impacts Division. (EPA document 

number EPA-452/R-12-003, December). Available at: 

<http://www.epa.gov/pm/2012/finalria.pdf>. 

U.S. EPA. 2013a. “Technical Support Document: Estimating the Benefit per Ton of Reducing 

PM2.5 Precursors from 17 Sectors.” Research Triangle Park, NC: Office of Air Quality 

Planning and Standards, February. Available at: 

<http://www.epa.gov/airquality/benmap/models/Source_Apportionment_BPT_TSD_1_31_13

.pdf>. 

U.S. EPA. 2013b. Integrated Science Assessment of Ozone and Related Photochemical Oxidants 

(Final Report). Washington, DC: U.S. Environmental Protection Agency. (EPA document 

number EPA/600/R-10/076F). Available at: 

<http://cfpub.epa.gov/ncea/isa/recordisplay.cfm?deid=247492#Download>. 
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5-1 

CHAPTER 5: ECONOMIC IMPACTS – MARKETS OUTSIDE THE 

ELECTRICITY SECTOR 

5.1 Introduction 

The energy sector impacts presented in Chapter 3 of this regulatory impact analysis (RIA) 

include projected changes in the prices for electricity, natural gas, and coal resulting from the 

proposed Electric Utility Generating Unit (EGU) Existing Source Greenhouse Gas (GHG) 

Guidelines. This chapter addresses the impact of these changes on other markets and discusses 

some of the determinants of the magnitude of these impacts. 

Under the proposed EGU Existing Source GHG Guidelines states are not required to use 

any of the measures that the EPA determines constitute BSER, or use those measures to the same 

degree of stringency that the EPA determines is achievable at reasonable cost; rather, CAA 

section 111(d) allows each state to determine the appropriate combination of, and the extent of 

its reliance on, measures for its state plan, by way of meeting its state-specific goal. Given the 

flexibilities afforded states in complying with the emission guidelines, the benefits, cost and 

economic impacts reported in this RIA are illustrative of compliance actions states may take. The 

compliance approaches adopted by the states will ultimately drive the magnitude and timing of 

impacts on the prices of electricity, natural gas, and coal and in turn other markets that use these 

commodities in the production process. The flexibility afforded to states by the Clean Air Act 

also allows them to adopt programs which include design elements that may mitigate or promote 

particular impacts based on their priorities. For example, states in the Regional Greenhouse Gas 

Initiative use the revenues from allowance auctions to support direct bill assistance for retail 

consumers, fund investments in clean energy and electricity demand reduction for business 

consumers, and support employment in the development of clean and renewable energy 

technologies. In its recent regulations to limit GHG emissions, California’s Air Resources Board 

designated a portion of allowances to be allocated to electric distribution companies for the 

purpose of mitigating electricity rate increases and their associated impacts. Other states may 

choose to comply with particularly robust deployment of renewables, energy efficiency, or 

natural gas in order to promote manufacturing demand or employment in those sectors. For 

example, energy efficiency investments may be targeted towards reducing both electricity 

Deleted: and cost-effective
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5-2 

consumption and natural gas or heating oil consumption, such as weatherization projects. The 

composition of these programs will influence the effects of the state’s compliance with the 

proposed rulemaking.

To support the Transport Rule proposed in the summer of 2010, among other rulemakings, 

the EPA used the Economic Model for Policy Analysis (EMPAX) to estimate the effect of 

impacts projected by the Integrated Planning Model (IPM) on markets outside the electricity 

sector. EMPAX is a dynamic computable general equilibrium (CGE) model that forecasts a new 

equilibrium for the entire economy after a policy intervention. While the external Council on 

Clean Air Compliance Analysis (Council) peer review of this study stated that inclusion of 

benefits in an economy-wide model, specifically adapted for use in that study, “represent[ed] a 

significant step forward in benefit-cost analysis,” EPA recognizes that serious technical 

challenges remain when attempting to evaluate the benefits and costs of potential regulatory 

actions using economy-wide models. Consistent with the Council’s advice regarding the 

importance of including benefit-side effects demonstrated by the 1990 to 2020 Clean Air Act 

study, and the lack of available multi-year air quality projections needed to include these benefitside effects, EPA has not conducted CGE modeling for this proposal. 

However, the EPA recognizes that serious technical challenges remain when attempting to 

evaluate the impacts of potential regulatory actions using economy-wide models. The EPA is 

therefore establishing a new Science Advisory Board (SAB) panel on economy-wide modeling 

to consider the technical merits and challenges of using this analytical tool to evaluate costs, 

benefits, and economic impacts in regulatory development. The EPA will use the 

recommendations and advice of this panel as an input into its process for improving benefit-cost 

and economic impact analyses that are used to inform decision-making at the agency. The panel 

will also be asked to identify potential paths forward for improvements that could address the 

challenges posed when economy-wide models are used to evaluate the effects of regulations. 

The advice from the Science Advisory Board (SAB) panel formed specifically to address 

the subject of economy-wide modeling will not be available in time for this proposal. Given the 

ongoing SAB panel on economy-wide modeling, the uncertain nature of the ultimate energy 

price impacts due to the compliance flexibility for states, and the ongoing challenges accurately 
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5-3 

representing costs, energy efficiency savings and economic benefits in economy-wide modeling, 

this Chapter proceeds by presenting the energy impacts associated with the illustrative scenarios 

analyzed in Chapter 3. This Chapter then presents a qualitative discussion of the factors that will, 

in part, determine the timing and magnitude of effects in other markets. 

5.2 Summary of Secondary Market Impacts of Energy Price Changes 

Electricity, natural gas, and coal are important inputs to the production of other goods and 

services. Therefore, changes in the price of these commodities will shift the production costs for 

sectors that use electricity, natural gas, and coal in the production of other goods and services. 

Such changes in production costs may lead to changes in the quantities and/or prices of the goods 

or services produced and changes in imports and exports. We refer to these changes as secondary 

market impacts. 

The EPA used IPM to estimate electricity, natural gas, and coal price changes based on the 

illustrative compliance approaches modeled for this proposal. IPM is a multi-regional, dynamic, 

deterministic linear programming model of the U.S. electric power sector that is described in 

more detail in Chapter 3. The prices are average prices weighted by the amount used. Table 5-1 

shows these estimated price changes. For other results generated by IPM, please refer to Chapter 

3.

There are many factors influencing the projected natural gas prices. Firstly, as discussed in 

Chapter 3, there are key differences between the two regulatory options (both stringency and 

over time). Second, IPM (and its integrated gas resource and supply module) will develop 

natural gas reserves and bring to market appropriate natural gas supplies based on a multitude of 

factors. Since the model simulates perfect foresight, it anticipates future demand for natural gas 

and respond accordingly. In addition, IPM (and the natural gas module) are viewing a very long 

time horizon (through 2050, longer than the compliance timeframe), such that the impacts in 

certain years may be responsive to other modeling assumptions or drivers. The modeling 

framework is simultaneously solving for all of these key market and policy parameters (both 

electric and natural gas), resulting in the impacts shown. For more information on the modeling 

framework see http://www.epa.gov/airmarkt/progsregs/epa-ipm/BaseCasev513.html.

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Table 5-1. Estimated Percentage Changes in Average Energy Prices, by Energy Type and 

Regulatory Option 

2020 2025 2030 

Option 1 Regional Compliance:

Electricity Price Change: 5.9% 2.7% 2.7% 

Delivered Natural Gas Price Change: 9.3% -3.3% -0.9% 

Delivered Coal Price Change: -16.3% -18.3% -18.1% 

Option 2 Regional Compliance 2020 2025 2030

Electricity Price Change: 3.6% 2.4% 1.1% 

Delivered Natural Gas Price Change: 7.5% 0.2% -3.2% 

Delivered Coal Price Change: -13.8% -14.4% -14.2% 

Option 1 State Compliance: 2020 2025 2030

Electricity Price Change: 6.5% 2.9% 3.1% 

Delivered Natural Gas Price Change: 11.5% -3.5% 0.0% 

Delivered Coal Price Change: -16.5% -17.9% -18.2% 

Option 2 State Compliance 2020 2025 2030

Electricity Price Change: 4.0% 2.7% 1.4% 

Delivered Natural Gas Price Change: 8.1% 0.8% -2.6% 

Delivered Coal Price Change: -13.6% -14.1% -14.2% 

For options and years when the price of electricity, natural gas, or coal increased, one 

would expect decreases in production and increases in market prices in sectors for which these 

commodities are inputs, ceteris paribus. Conversely, in options and years when prices of these 

inputs decreased, one would expect increases in production and decreases in market prices within 

these sectors. Smaller changes in input price changes are assumed to lead to smaller impacts 

within secondary markets. However, a number of factors in addition to the magnitude and sign of 

the energy price changes, influence the magnitude of the impact on production and market prices 

for sectors using electricity, natural gas, or coal as inputs to production. These factors are 

discussed below. 

Comment [A79]: Would EPA provide intuition 

on why gas price changes are so different between 

option 1 and 2? 

Comment [A80]: Text added on previous page to 

address this. 
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5.3.1 Share of Total Production Costs 

The impact of energy price changes in a particular sector depends, in part, on the share of 

total production costs attributable to those commodities. For sectors in which the directly 

affected inputs are only a small portion of production costs, the impact will be smaller than for 

sectors in which these inputs make up a greater portion of total production costs. Therefore more 

energy-intensive sectors would potentially experience greater cost increases when electricity, 

natural gas, or coal prices increase, but would also experience greater savings when these input 

prices decrease.121

5.3.2 Ability to Substitute between Inputs to the Production Process 

The ease with which producers are able to substitute other inputs for electricity, natural 

gas, or coal, or even amongst those commodities, influences the impact of price changes for 

these inputs. Those sectors with a greater ability to substitute across energy inputs or to other 

inputs will be able to, at least partially, offset the increased cost of these inputs resulting in 

smaller market impacts. Similarly, when prices for electricity, natural gas, or coal decrease, some 

sectors may choose to use more of these inputs in place of other more costly substitutes. 

5.3.3 Availability of Substitute Goods and Services 

The ability of producers in sectors experiencing changes in their input prices to pass along 

the increased costs to their customers in the form of higher prices for their products depends, in 

part, on the availability of substitutes for the sectors’ products. Substitutes may either be other 

domestic products or foreign imports. If close substitutes exist, the demand for the product will 

in general be more elastic and the producers will be less able to pass on the added cost through a 

price increase. 

Such substitution can also take place between foreign and domestic goods within the same 

sector. Changes in the price of electricity, natural gas, and coal can influence the quantities of 

goods imported or exported from sectors using these inputs. When the cost of domestic 

production increases due to more expensive inputs, imports may increase as consumers substitute 

 

121 The net direct effect of this rulemaking on the production costs of a sector that is attributable to a change in the 

electricity price also depends on the expenditures the sector makes to reduce its demand for electricity under any 

energy efficiency program that was adopted to achieve a state goal. That said, those expenditures may lead to 

other reduced expenditures for the sector, such as reduced natural gas use from weatherization projects. 

Comment [A81]: Trade exposed industries will 

also have a more difficult time passing the costs 

along as well. 

Comment [A82]: Text changed to include this 

point. 
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5-6 

towards relatively less costly foreign-produced goods. If imports increase as a result of a 

regulation and those imports come from countries with fewer emission controls, this can result in 

foreign emission increases that offset some portion of domestic decreases, an effect commonly 

referred to as “leakage.” The potential for leakage is noteworthy for global pollutants such as 

carbon dioxide (CO2) and other GHG emissions. Unlike most criteria pollutants and hazardous 

air pollutants, the impacts of CO2 emissions are not affected by the location from which those 

emissions originate. EPA does not anticipate significant leakage in the EGU sector to occur from 

this regulation because the nature of electricity transmission does not lend itself to significant 

imports or exports of electricity.

5.4 Conclusions 

Changes in the price of electricity, natural gas, and coal can impact markets for goods and 

services produced by sectors that use these energy inputs in the production process. The direction 

and magnitude of these impacts is influenced by a number of factors. Changes in cost of 

production may lead to changes in price, quantity produced, and profitability of firms within 

secondary markets. If regulation results in changes in domestic markets that lead to an increase 

in imports, increases in production in countries with more energy-intensive production may lead 

to emissions leakage. 

Deleted: as discussed in Chapter 3.

Comment [A83]: Would EPA provide the page 

numbers in Chapter 3 that leads to this conclusion? 

Comment [A84]: Changed text to reflect reason 

for lack of leakage rather than referring to chapter 3. 
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6-1 

CHAPTER 6: EMPLOYMENT IMPACT ANALYSIS 

6.1 Introduction 

Executive Order 13563 directs federal agencies to consider regulatory impacts on job 

creation and employment. According to the Executive Order, “our regulatory system must 

protect public health, welfare, safety, and our environment while promoting economic growth, 

innovation, competitiveness, and job creation. It must be based on the best available science” 

(Executive Order 13563, 2011). Although standard benefit-cost analyses have not typically 

included a separate analysis of regulation-induced employment impacts,122 during periods of 

sustained high unemployment, employment impacts are of particular concern and questions may 

arise about their existence and magnitude. The chapter discusses and projects potential 

employment impacts of the Proposed Electric Generating Unit Greenhouse Gas (EGU GHG) 

Existing Source Guidelines for the electric power industry, coal and natural gas production, and 

demand-side energy efficiency. 

Section 6.2 presents the overview of the guidelines and a general description of the 

associated building block framework. Section 6.3 describes the theoretical framework used to 

analyze regulation-induced employment impacts, discussing how economic theory alone cannot 

predict whether such impacts are positive or negative. Section 6.4 presents an overview of the 

peer-reviewed literature relevant to evaluating the effect of environmental regulation on 

employment. Section 6.5 provides background regarding recent employment trends in the 

electricity generation, coal and natural gas extraction, renewable energy, and demand-side 

energy efficiency-related sectors. Section 6.6 presents the EPA’s quantitative projections of 

potential employment impacts in these sectors. These projections are based in part on a detailed 

model of the electricity production sectors used for this regulatory analysis. Additionally, this 

section discusses projected employment impacts due to demand-side energy efficiency activities. 

Section 6.7 offers several conclusions. 

6.2 Overview of the Proposed EGU GHG Existing Source Guidelines 

The EPA is proposing emission guidelines for states to use in developing plans to address 

greenhouse gas emissions from existing fossil fuel-fired EGUs. Specifically, EPA is proposing 

 

122 Labor expenses do, however, contribute toward total costs in the EPA’s standard benefit-cost analyses. 
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6-2 

state-specific rate-based goals for carbon dioxide emissions from the power sector, as well as 

emission guidelines for states to use in developing plans to attain the state-specific goals. The 

guidelines, as proposed, will lower carbon intensity of power generation in the United States. 

Under the Clean Air Act (CAA) section 111(d), state plans must establish standards of 

performance that reflect the degree of emission limitation achievable through the application of 

the “best system of emission reduction” (BSER) that, taking into account the cost of achieving 

such reductions and non-air quality health and environmental impact and energy requirements, 

the Administrator determines has been adequately demonstrated. Consistent with CAA section 

111(d), this proposed rule contains state-specific goals that reflect the EPA’s calculation of 

emission reductions that a state can achieve through the cost-effective application of BSER. The 

EPA is using four building blocks as a basis to determine state-specific goals. 

6.2.1 Determining State Goals Utilizing the Four Building Blocks 

In proposing state goals, EPA is applying the following four building blocks. Each 

represents a demonstrated approach to improving the GHG performance of existing EGUs in the 

power sector:123

1. Reducing the carbon intensity of generation at individual affected EGUs through heat rate 

improvements.

2. Reducing emissions from the most carbon-intensive affected EGUs in the amount that 

results from substituting generation at those EGUs with generation from less carbonintensive affected EGUs (including NGCC units under construction).

3. Reducing emissions from affected EGUs in the amount that results from substituting 

generation at those EGUs with expanded low- or zero-carbon generation.

4. Reducing emissions from affected EGUs in the amount that results from the use of 

demand-side energy efficiency that reduces the amount of generation required. 

6.3 Economic Theory and Employment 

Regulatory employment impacts are difficult to disentangle from other economic changes 

affecting employment decisions, over time and across regions and industries. Labor market 

 

123 Refer to Chapter 3 for information regarding estimates of emissions reductions achievable by each building block 

and the determination of state-specific goals. 

Deleted: 

Deleted: lower

Deleted: (e.g.,

Deleted: );

Deleted: r

Deleted: of

Deleted: to the extent that this can be 

accomplished cost-effectively by shifting

Deleted: natural gas combined cycle (

Deleted: )

Deleted: ;

Deleted: r

Deleted: of carbon-emitting

Deleted: to the extent that this can be 

accomplished cost-effectively by

Deleted: ing

Deleted: the amount of new, lower (or no) 

carbon-intensity

Deleted: ;

Deleted: r

Deleted: of

Deleted: carbon-emitting EGUs to the extent 

that this can be accomplished by cost-effectively 

increasing
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6-3 

responses to regulation are complex. They depend on labor demand and supply elasticities and 

possible labor market imperfections (e.g., wage stickiness, long-term unemployment, etc). The 

unit of measurement (e.g., number of jobs, types of job hours worked, and earnings), may affect 

observability of that response. Net employment impacts are composed of a mix of potential 

declines and gains in different areas of the economy (e.g., the directly regulated sector, upstream 

and downstream sectors, etc.) over time. In light of these difficulties, economic theory provides a 

constructive framework for analysis. 

Microeconomic theory describes how firms adjust their use of inputs in response to 

changes in economic conditions.124 Labor is one of many inputs to production, along with 

capital, energy, and materials. In competitive markets, firms choose inputs and outputs to 

maximize profit as a function of market prices and technological constraints.125,126

Berman and Bui (2001) and Morgenstern, Pizer, and Shih (2002), adapt this model to 

analyze how environmental regulations affect labor demand.127 They model environmental 

regulation as effectively requiring certain factors of production, such as pollution abatement 

capital, at levels that firms would not otherwise choose. 

Berman and Bui (2001, pp. 274-75) model two components that drive changes in firmlevel labor demand: output effects and substitution effects.128 Regulation affects the profitmaximizing quantity of output by changing the marginal cost of production. If regulation causes 

marginal cost to increase, it will place upward pressure on output prices, leading to a decrease in 

demand, and resulting in a decrease in production. The output effect describes how, holding 

labor intensity constant, a decrease in production causes a decrease in labor demand. As noted by 

Berman and Bui, although many assume that regulation increases marginal cost, it need not be 

the case. A regulation could induce a firm to upgrade to less polluting, and more efficient 

 

124 See Layard and Walters (1978), a standard microeconomic theory textbook, for a discussion, in Chapter 9. 

125 See Hamermesh (1993), Ch. 2, for a derivation of the firm’s labor demand function from cost-minimization. 

126 In this framework, labor demand is a function of quantity of output and prices (of both outputs and inputs). 

127 Berman and Bui (2001) and Morgenstern, Pizer, and Shih (2002) use a cost-minimization framework, which is a 

special case of profit-maximization with fixed output quantities. 

128 The authors also discuss a third component, the impact of regulation on factor prices, but conclude that this effect 

is unlikely to be important for large competitive factor markets, such as labor and capital. Morgenstern, Pizer 

and Shih (2002) use a very similar model, but they break the employment effect into three parts: 1) a demand 

effect; 2) a cost effect; and 3) a factor-shift effect. 
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6-4 

equipment that lowers marginal production costs. In such a case, output could increase. For 

example, in the context of the current rule, improving the heat rate of utility boiler increases fuel 

efficiency, lowering marginal production costs, and thereby potentially increasing the boiler’s 

generation. An unregulated profit-maximizing firm may not have chosen to install such an 

efficiency-improving technology if the investment cost were too high. 

The substitution effect describes how, holding output constant, regulation affects laborintensity of production. Although increased environmental regulation may increase use of 

pollution control equipment and energy to operate that equipment, the impact on labor demand is 

ambiguous. For example, equipment inspection requirements, specialized waste handling, or 

pollution technologies that alter the production process may affect the number of workers 

necessary to produce a unit of output. Berman and Bui (2001) model the substitution effect as the 

effect of regulation on pollution control equipment and expenditures required by the regulation 

and the corresponding change in labor-intensity of production. 

In summary, as output and substitution effects may be positive or negative, theory alone 

cannot predict the direction of the net effect of regulation on labor demand at the level of the 

regulated firm. Operating within the bounds of standard economic theory, however, empirical 

estimation of net employment effects on regulated firms is possible when data and methods of 

sufficient detail and quality are available. The literature, however, illustrates difficulties with 

empirical estimation, For example, studies sometimes rely on confidential plant-level 

employment data from the U.S. Census Bureau, possibly combined with pollution abatement 

expenditure data that are too dated to be reliably informative. In addition, the most commonly 

used empirical methods do not permit estimation of net effects. 

The conceptual framework described thus far focused on regulatory effects on plant-level 

decisions within a regulated industry. Employment impacts at an individual plant do not 

necessarily represent impacts for the sector as a whole. The approach must be modified when 

applied at the industry level. 

At the industry-level, labor demand is more responsive if: (1) the price elasticity of 

demand for the product is high, (2) other factors of production can be easily substituted for labor, 

(3) the supply of other factors is highly elastic, or (4) labor costs are a large share of total 
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production costs.129 For example, if all firms in an industry are faced with the same regulatory 

compliance costs and product demand is inelastic, then industry output may not change much, 

and output of individual firms may change slightly.130 In this case the output effect may be small, 

while the substitution effect depends on input substitutability. Suppose, for example, that new 

equipment for heat rate improvements requires labor to install and operate. In this case the 

substitution effect may be positive, and with a small output effect, the total effect may be 

positive. As with potential effects for an individual firm, theory cannot determine the sign or 

magnitude of industry-level regulatory effects on labor demand. Determining these signs and 

magnitudes requires additional sector-specific empirical study. For environmental rules, much of 

the data needed for these empirical studies are not publicly available, would require significant 

time and resources in order to access confidential U.S. Census data for research, and also would 

not be necessary for other components of a typical RIA. 

In addition to changes to labor demand in the regulated industry, net employment impacts 

encompass changes in other related sectors. For example, the proposed guidelines may increase 

demand for heat rate improving equipment and services. This increased demand may increase 

revenue and employment in the firms supporting this technology. At the same time, the regulated 

industry is purchasing the equipment and these costs may impact labor demand at regulated 

firms. Therefore, it is important to consider the net effect of compliance actions on employment 

across multiple sectors or industries. 

If the U.S. economy is at full employment, even a large-scale environmental regulation is 

unlikely to have a noticeable impact on aggregate net employment.131 Instead, labor would 

primarily be reallocated from one productive use to another (e.g., from producing electricity or 

steel to producing high efficiency equipment), and net national employment effects from 

environmental regulation would be small and transitory (e.g., as workers move from one job to 

another).132 

 

129 See Ehrenberg & Smith, p. 108. 

130 This discussion draws from Berman and Bui (2001), pp. 293. 

131 Full employment is a conceptual target for the economy where everyone who wants to work and is available to 

do so at prevailing wages is actively employed. The unemployment rate at full employment is not zero. 

132 Arrow et. al. 1996; see discussion on bottom of p. 8. In practice, distributional impacts on individual workers can 

be important, as discussed in later paragraphs of this section. 
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Affected sectors may experience transitory effects as workers change jobs. Some workers 

may retrain or relocate in anticipation of new requirements or require time to search for new 

jobs, while shortages in some sectors or regions could bid up wages to attract workers. These 

adjustment costs can lead to local labor disruptions. Although the net change in the national 

workforce is expected to be small, localized reductions in employment may adversely impact 

individuals and communities just as localized increases may have positive impacts. 

If the economy is operating at less than full employment, economic theory does not clearly 

indicate the direction or magnitude of the net impact of environmental regulation on 

employment; it could cause either a short-run net increase or short-run net decrease 

(Schmalansee and Stavins, 2011). An important research question is how to accommodate 

unemployment as a structural feature in economic models. This feature may be important in 

assessing large-scale regulatory impacts on employment (Smith 2012). 

Environmental regulation may also affect labor supply. In particular, pollution and other 

environmental risks may impact labor productivity or employees’ ability to work.133 While the 

theoretical framework for analyzing labor supply effects is analogous to that for labor demand, it 

is more difficult to study empirically. There is a small emerging literature, described in the next 

section that uses detailed labor and environmental data to assess these impacts. 

To summarize, economic theory provides a framework for analyzing the impacts of 

environmental regulation on employment. The net employment effect incorporates expected 

employment changes (both positive and negative) in the regulated sector and elsewhere. Labor 

demand impacts for regulated firms, and also for the regulated industry, can be decomposed into 

output and substitution effects which may be either negative or positive. Estimation of net 

employment effects for regulated sectors is possible when data of sufficient detail and quality are 

available. Finally, economic theory suggests that labor supply effects are also possible. In the 

next section, we discuss the empirical literature. 

6.4 Current State of Knowledge Based on the Peer-Reviewed Literature 

The labor economics literature contains an extensive body of peer-reviewed empirical 

work analyzing various aspects of labor demand, relying on the theoretical framework discussed 

 

133 E.g. Graff Zivin and Neidell (2012). 
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in the preceding section.134 This work focuses primarily on effects of employment policies such 

as labor taxes and minimum wages.135 In contrast, the peer-reviewed empirical literature 

specifically estimating employment effects of environmental regulations is more limited. 

Empirical studies, such as Berman and Bui (2001) , suggest that net employment impacts 

were not statistically different from zero small in the regulated sector. Other research suggests 

that more highly regulated counties may generate fewer jobs than less regulated ones 

(Greenstone 2002). Environmental regulations may affect sectors that support pollution 

reduction earlier than the regulated industry. Rules are usually announced well in advance of 

their effective dates and then typically provide a period of time for firms to invest in technologies 

and process changes to meet the new requirements. When a regulation is promulgated, the initial 

response of firms is often to order pollution control equipment and services to enable compliance 

when the regulation becomes effective. Estimates of short-term increases in demand for 

specialized labor within the environmental protection sector have been prepared for several EPA 

regulations in the past, including the Mercury and Air Toxics Standards (MATS).136 Overall, the 

peer-reviewed literature does not contain evidence that environmental regulation has a large 

impact on net employment (either negative or positive) in the long run across the whole 

economy. 

6.4.1 Regulated Sector 

Berman and Bui (2001) examine how an increase in local air quality regulation affects 

manufacturing employment in the South Coast Air Quality Management District (SCAQMD), 

which includes Los Angeles and its suburbs. From 1979 to 1992 the SCAQMD enacted some of 

the country’s most stringent air quality regulations. Using SCAQMD’s local air quality 

regulations, Berman and Bui identify the effect of environmental regulations on net employment 

in regulated manufacturing industries relative to other plants in the same 4-digit SIC industries 

but in regions not subject to local regulations.137 The authors find that “while regulations do 

impose large costs, they have a limited effect on employment” (Berman and Bui, 2001, p. 269). 

 

134 Again, see Hamermesh (1993) for a detailed treatment. 

135 See Ehrenberg & Smith (2000), Chapter 4: “Employment Effects: Empirical Estimates” for a concise overview. 

136 U.S. EPA (2011b). 

137 Berman and Bui include over 40 4-digit SIC industries in their sample. They do not estimate the number of jobs 

created in the environmental protection sector. 
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Their conclusion is that local air quality regulation “probably increased labor demand slightly” 

but that “the employment effects of both compliance and increased stringency are fairly precisely 

estimated zeros, even when exit and dissuaded entry effects are included” (Berman and Bui, 

2001, p. 269).138 

The few studies in peer-reviewed journals evaluating employment impacts of policies that 

reduce CO2 emissions in the electric power generation sector are in the European context. In a 

sample of 419 German firms, 13 percent of which were in the electricity sector, Anger and 

Oberndorfer (2008) find that the initial allocation of emission permits did not significantly affect 

employment growth in the first year of the EU Emissions Trading Scheme (ETS). Examining 

European firms from 1996-2007, Commins et al. (2011) find that a 1 percent increase in energy 

taxes is associated with a 0.01 percent decrease in employees in the electricity and gas sector. 

Chan et al. (2013) estimate the impact of the EU ETS on a panel of almost 6,000 firms in 10 

European countries from 2005-2009. They find that firms in the power sector that participated in 

the ETS had 2-3 percent fewer employees relative to those that did not participate, but this effect 

is not statistically significant. 

This literature suggests that the employment impacts of controlling CO2 emissions in the 

European power sector were small. The degree to which these studies’ results apply to the U.S. 

context is unclear. European policies analyzed in these studies effectively put a price on 

emissions either through taxes or tradable permits. A performance standard may not generate 

similar employment effects. Moreover, European firms face relative fuel prices and market 

regulatory structures different from their U.S. counterparts, further complicating attempts to 

transfer quantitative results from the EU experience to evaluate this rule. 

A small literature examines impacts of environmental regulations on manufacturing 

employment. Kahn and Mansur (2013) study environmental regulatory impacts on geographic 

distribution of manufacturing employment, controlling for electricity prices and labor regulation 

(right to work laws). Their methodology identifies employment impacts by focusing on 

neighboring counties with different air quality regulations. They find limited evidence that 

environmental regulations may cause employment to be lower within “county-border-pairs.” 

 

138 Including the employment effect of exiting plants and plants dissuaded from opening will increase the estimated 

impact of regulation on employment. 
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6-9 

This result suggests that regulation may cause an effective relocation of labor across a county 

border, but since one county’s loss is another’s gain, such shifts cannot be transformed into an 

estimate of a national net effect on employment. Moreover this result is sensitive to model 

specification choices. 

6.4.2 Labor Supply Impacts 

The empirical literature on environmental regulatory employment impacts focuses 

primarily on labor demand. However, there is a nascent literature focusing on regulation-induced 

effects on labor supply.139 Although this literature is limited by empirical challenges, researchers 

have found that air quality improvements lead to reductions in lost work days (e.g., Ostro 1987). 

.Limited evidence suggests worker productivity may also improve when pollution is reduced. 

Graff Zivin and Neidell (2012) used detailed worker-level productivity data from 2009 and 2010, 

paired with local ozone air quality monitoring data for one large California farm growing 

multiple crops, with a piece-rate payment structure. Their quasi-experimental structure identifies 

an effect of daily variation in monitored ozone levels on productivity. They find “ozone levels 

well below federal air quality standards have a significant impact on productivity: a 10 parts per 

billion (ppb) decreases in ozone concentrations increases worker productivity by 5.5 percent.” 

(Graff Zivin and Neidell, 2012, p. 3654).142

This section has outlined the challenges associated with estimating regulatory effects on 

both labor demand and supply for specific sectors. These challenges make it difficult to estimate 

net national employment estimates that would appropriately capture the way in which costs, 

compliance spending, and environmental benefits propagate through the macro-economy. 

Quantitative estimates are further complicated by the fact that macroeconomic models often have 

little sectoral detail and usually assume that the economy is at full employment. The EPA is 

currently seeking input from an independent expert panel on modeling economy-wide regulatory 

impacts, including employment effects.143

 

139 For a recent review see Graff-Zivin and Neidell (2013).

142 The EPA is not quantifying productivity impacts of reduced pollution in this rulemaking using this study. In light 

of this recent research, however, the EPA is considering how best to incorporate possible productivity effects in 

the future.

143 For further information see: <https://www.federalregister.gov/articles/2014/02/05/2014-02471/draft-supportingmaterials-for-the-science-advisory-board-panel-on-the-role-of-economy-wide-modeling>.

Deleted: T

Deleted: .

Deleted: R

Deleted: days and mortality are reduced when air 

quality improves

Deleted: 140 The EPA’s study of benefits and costs 

of implementing clean air regulations used these 

studies to predict how increased labor availability 

would increase the labor supply and improve 

productivity and the economy.141

Deleted: W

Deleted: Graff Zivin and Neidell (2013) review the 

research studying these productivity effects, focusing 

on how health and human capital may be affected by 

environmental quality, particularly air pollution. In 

previous research, 
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6.5 Recent Employment Trends 

The U.S. electricity system includes employees that support electric power generation, 

transmission and distribution, the extraction of fossil fuels, renewable energy generation and 

supply-side and demand-side energy efficiency. This section describes recent employment trends 

in the electricity system. 

6.5.1 Electric Power Generation 

In 2013 the electric power generation, transmission and distribution sector (NAICS 2211) 

employed 394,000 workers in the U. S.144 Installation, maintenance, and repair occupations 

accounted for the largest share of workers (30 percent).145 These categories include inspection, 

testing, repairing and maintaining of electrical equipment and/or installation and repair of cables 

used in electrical power and distribution systems. Other major occupation categories include 

office and administrative support (17 percent), production occupations (15 percent), architecture 

and engineering (11 percent), business and financial operations (7 percent) and management (6 

percent). 

As shown in Figure 6.1, employment in the Electric Power Industry averaged 435,000 

workers in the early 2000s, declining to an average of 400,000 workers later in the decade, and to 

394,000 workers in 2013. 

 

144 U.S. Bureau of Labor Statistics. “Current Employment Survey Seasonally Adjusted Employment for Electric 

Power Generation, Transmission, and Distribution (national employment).” Series ID: CES4422110001. Data 

extracted on: February 19, 2014. Available at: <http://www.bls.gov/ces/data.htm>.

145 U.S. Bureau of Labor Statistics, Occupational Employment Statistics, May 2012 National Industry-Specific 

Occupational Employment and Wage Estimates, Electric Power Generation, Transmission, and Distribution 

(NAICS 2211). Available at: <http://www.bls.gov/oes/current/naics4_221100.htm>. 
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6-11 

Figure 6.1. Electric Power Industry Employment 

6.5.2 Fossil Fuel Extraction 

6.5.2.1 Coal Extraction 

The coal extraction sector is primarily engaged in coal mining and coal mine site 

development, excluding metal ore mining and nonmetallic mineral mining and quarrying. There 

are two sources of U.S. government data on coal mining employment, the BLS Current 

Employment Statistics (NAICS 2121), and the Department of Labor’s Mine Safety and Health 

Administration (MSHA).146 Both sources show similar national levels and trends, though one is 

survey-based (BLS) and the other is census-based (MSHA). MSHA tracks direct coal mine 

employment and independent contractor employment, whereas BLS does not track contractors. 

Contractor employment reported by MSHA focuses primarily on mine development, 

construction, reconstruction or demolition of mine facilities, construction of dams, excavation or 

 

146 U.S. Bureau of Labor Statistics. “Current Employment Statistics Seasonally Adjusted Employment for Coal 

Mining (national employment),” NAICS 2121, Series ID: CES1021210001. Data extracted on: February 19, 

2014. Available at: < http://www.bls.gov/ces/data.htm>. 350 400 450 500

2000 2005 2010 2015

Year

Electric Power Industry national employment (in thousands)
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earth moving, equipment installation, service or repair, and material handling, drilling, or 

blasting.147 In 2013, BLS reported 79,000 coal mining employees, and MSHA reported 80,000 

coal mining employees and 32,000 contractors.148 Both sets of data reveal a stable trend in 

employment over the past 10 years, with the exception of a small temporary increase in 2011. 

See Figure 6.2 below. 

Figure 6.2. Coal Production Employment 

6.5.2.2 Oil and Gas Extraction 

In 2013, there were 198,000 employees in the oil and gas extraction sector (NAICS 

211).149 This sector includes production of crude petroleum, oil from oil shale and oil sands, 

 

147 Mine Safety and Health Administration, CFR Part 50 Title 30 Employment Data – selected contract employment 

is included, p. 2. Available at: 

<http://www.msha.gov/Stats/Part50/WQ/MasterFiles/MIWQ%20Master_20133.pdf>. U.S. Bureau of Labor 

Statistics, Current Employment Statistics – contract employment not included. Available at: 

<http://www.bls.gov/ces/idcf/forme_sp.pdf>. 

148 Annual averages calculated for: (i) BLS monthly coal mining employment data for 2013, and (ii) MSHA Part 50 

quarterly data for 2013. Available at: <http://www.msha.gov/STATS/PART50/P50Y2K/AETABLE.HTM>. 

149 BLS, Current Employment Statistics. Seasonally adjusted employment for oil and gas extraction (national 

employment), NAICS 211. Series ID: CES1021100001. Data extracted on: February 19, 2014. Available at: 

< http://www.bls.gov/ces/data.htm>. 20 40 60 80 100

2000 2005 2010 2015

Year

BLS - employees MSHA - employees

MSHA - contractors

Coal mining employment - national (in thousands)
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production of natural gas, sulfur recovery from natural gas, and recovery of hydrocarbon liquids. 

Activities include the development of gas and oil fields, exploration activities for crude 

petroleum and natural gas, drilling, completing, and equipping wells, and other production 

activities.150 In contrast with coal, and looking at Figure 6.3, there has been a sharp increase in 

employment in this sector over the past decade. 

Figure 6.3. Oil and Gas Production Employment 

6.5.3 Clean Energy Employment Trends 

Clean energy resources, such as energy efficiency and renewable energy, are used to meet 

energy demand, reduce peak electricity system loads, and reduce reliance on the most carbonintensive sources of electricity. However, there is not a single clean energy sector in standard 

national accounts classifications. Renewable generation is not reported to the Bureau of Labor 

and Statistics separately from other electric power generation. Similarly, manufacturers of 

energy efficient appliances are not reported separately from conventional appliance 

 

150 U.S. Bureau of Labor Statistics. 20014. Available at: <http://www.bls.gov/iag/tgs/iag211.htm Accessed Feb. 19>. 100 150 200 250

2000 2005 2010 2015

Year

Oil and Gas Extraction national employment (in thousands)
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manufacturers and green building design is not separate from the construction sector. Instead, 

clean energy technology and services are supported by industries throughout the economy. 

Without a specific industrial classification, it is difficult to quantify the exact number of 

clean energy-related jobs or document the trends. Employees engaged in clean energy can span 

many job classifications, such as experts required to design and produce a renewable or energyefficient technology, workers that supply inputs and technicians who install service or operate 

equipment. As such, there are a variety of definitions of clean or green jobs used, some more 

expansive than others. 

6.5.3.1 Defining Clean Energy Jobs 

Two U.S. Government sources, the 2010 Department of Commerce (DOC) report, 

Measuring the Green Economy and the 2010 and 2011 Bureau of Labor Statistics (BLS) Green 

Goods and Services surveys have subdivided industrial classifications into “green” categories. In 

both cases the approach was to determine which product classifications, rather than industries, 

were green. They multiplied green production by product revenue and defined an industrial 

sector as green if it met a threshold of green revenue as a proportion of total revenue. 

DOC broadly defined green jobs in 2010 as those “created and supported in businesses that 

produce green products and services.” 151 They further classified green jobs into a broad and a 

narrow category. The narrow category includes only products deemed to be green without 

disagreement, while the broad category is less conservative. DOC analysts applied their 

definition of green goods and services to over 22,000 product codes in the 2007 Economic 

Census to estimate their contribution to the U.S. economy. The report found that the number of 

green jobs in 2007 ranged from 1.8 million to 2.4 million jobs, accounting for between 1.5 and 2 

percent of total private sector employment.152 

BLS used an expansive definition of clean or green jobs in 2010 and 2011. It goes beyond 

direct clean energy-related investments and includes “those in businesses that produce goods and 

provide services that benefit the environment or conserve natural resources. These goods and 

 

151 U.S. Department of Commerce Economics and Statistics Administration. 2010. “Measuring the Green 

Economy,” April. Available at: 

<http://www.esa.doc.gov/sites/default/files/reports/documents/greeneconomyreport_0.pdf>. 

152 U.S. Department of Commerce Economics and Statistics Administration. 2010. “Measuring the Green Economy, 

April. Available at: <http://www.esa.doc.gov/sites/default/files/reports/documents/greeneconomyreport_0.pdf>. 
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services, which are sold to customers, include research and development, installation, and 

maintenance services for renewable energy and energy efficiency and education and training 

related to green technologies and practices” but also include recycling and natural resource 

conservation, such as forestry management.153 Based on surveys across the 325 industries it 

identified as potential producers of green goods and services, BLS counts approximately 2.3 

million jobs in the green economy in 2010, rising 7.4 percent to 2.5 million in 2011,154 compared 

to increases of about one percent across all occupations in the entire economy over the same 

period.155 The table below, Table 6-1, presents BLS green job estimates nationally and for the 

utility sector. 

 Table 6-1. U. S. Green Goods and Services (GGS) Employment (annual 

average) 

Total GGS 

Employment 

Utility GGS 

Employment 

Total GGS Growth 

2010-11 

Utility GGS 

Growth 2010-11 

2010 2,342,562 69,031 NA NA 

2011 2,515,200 71,129 7.4% 3.0% 

 

 Source: Bureau of Labor Statistics 

6.5.3.2 Renewable Electricity Generation Employment Trends 

The DOC report does not separate renewable energy data and the BLS data include only 

privately owned electricity generating facilities. As such, neither source isolates renewable 

electricity generation employment. For historical trends in this sector, we therefore, rely on a 

Brookings Institution study, Muro et al. (2011). This study built a national database of “clean 

economy” jobs from the bottom up, verifying each company individually.156 They include a list 

 

153 BLS has identified 325 detailed industries (6-digit NAICS) as potential producers of green goods and services. 

Available at: <http://www.bls.gov/ggs/ggsoverview.htm>. (Accessed on 1-14-14, last modified date: March 

19, 2013. 

154 U.S. Department of Labor, U.S. Bureau of Labor Statistics. (n.d.). 2011. “Green Goods and Services 2010-2011.” 

(Retrieved on January 14, 2014). Available at :< http://www.bls.gov/ggs/ggsoverview.htm>.

155U.S. Department of Labor, U.S. Bureau of Labor Statistics. 2010. National Occupational Employment and Wage 

Estimates, United States. Available at: <http://www.bls.gov/oes/2010/may/oes_nat.htm>, May. National 

Occupational Employment and Wage Estimates, United States http://www.bls.gov/oes/2010/may/oes_nat.htm. 

156 <http://www.brookings.edu/~/media/Series/resources/0713_clean_economy.pdf> p. 15. 
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of categories similar but not identical to that of BLS, including agricultural and natural resources 

conservation, education and compliance, energy and resource efficiency, greenhouse gas 

reduction, environmental management and recycling, and renewable energy. This study found 

about 138,000 jobs in the renewable energy sector in 2010, with an overall average annual 

growth rate of 3.1 percent from 2003-2010. Table 6-2 details the national results by energy 

source. 

 Table 6-2. Renewable Electricity Generation-Related Employment 

Sector Jobs, 2010 

2003-2010 Average Annual 

Growth Rate 

Biofuels/Biomass 20,680 8.9 

Geothermal 2,720 6.7 

Hydropower 55,467 -3.6 

Renewable Energy Services 1,981 6.3 

Solar Photovoltaic 24,152 10.7 

Solar Thermal 5,379 18.4 

Waste-to-Energy 3,320 3.7 

Wave/Ocean Power 371 20.9 

Wind 24,294 14.9 

Total 138,364 3.1 

 Source: http://www.brookings.edu/~/media/Series/resources/0713_clean_economy.pdf, Appendix A.

6.5.3.3 Employment Trends in Demand-Side Energy Efficiency Activities 

U.S. government data used for calculating the historical trends in the demand-side energy 

efficiency sector come from the BLS green goods and services surveys. BLS reports an energy 

efficiency category, finding 1.49 million private sector energy efficiency jobs in 2010 and 1.64 

million in 2011. 

For a longer term trend the Brookings Institution study (Muro et al. 2011) built a national 

database of “clean economy” jobs from the bottom up, verifying each company individually.157

This study found about 428,000 jobs in the Energy and Resource Efficiency sector in 2010, with 

an overall average annual growth rate of 2.6 percent from 2003-2010. Table 6-3 details the 

results by energy sector. 

 

157 <http://www.brookings.edu/~/media/Series/resources/0713_clean_economy.pdf> p. 15 
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 Table 6-3. Energy and Resources Efficiency-Related Employment 

Sector Jobs, 2010 2003-2010 Average 

 Annual Growth Rate 

Appliances 36,608 -3.1 

Energy-saving Building Materials 161,896 2.5 

Energy-saving Consumer Products 19,210 -2.9 

Green Architecture and Construction Services 56,190 6.4 

HVAC and Building Control Systems 73,600 3.3 

Lighting 14,298 -1.8 

Professional Energy Services 49,863 6.9 

Smart Grid 15,987 8.6 

Total 427,652 2.6 

 Source: http://www.brookings.edu/~/media/Series/resources/0713_clean_economy.pdf, Appendix A 

In addition, other research institutes and industry groups have clean economy or clean 

energy employment databases. While definitions and timeframes vary, all show positive 

employment trends of 1.9 percent or more growth in clean energy-related jobs annually. 

6.6 Projected Sectoral Employment Changes due to Proposed Guidelines 

EGUs may respond to these proposed guidelines by placing new orders for efficiencyrelated or renewable energy equipment and services to reduce GHG emissions. Installing and 

operating new equipment or improving heat rate efficiency could increase labor demand in the 

electricity generating sector itself, as well as associated equipment and services sectors. 

Specifically, the direct employment effects of supply-side initiatives include changes in labor 

demand for manufacturing, installing, and operating higher efficiency or renewable energy 

electricity generating assets supported by the initiative while reducing the demand for labor that 

would have been used by less efficient or higher emitting generating assets. Once implemented, 

increases in operating efficiency would impact the power sector’s demand for fuel and plans for 

EGU retirement and new construction. 

In addition, EPA expects state compliance plans to also include demand-side energy 

efficiency policies and programs that typically change energy consumption patterns of business 

and residential consumers by reducing the quantity of energy required for a given level of 

production or service. Demand-side initiatives generally aim to increase the use of cost-effective 

energy efficiency technologies (e.g., including more efficient appliances and air conditioning 

Formatted: 11 Caption Table

Deleted: For more information about these studies, 

see Appendix 6.B.2 Other Approaches to Exploring 

Clean Energy Employment Trends.
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systems, more efficient lighting devices, more efficient design and construction of new homes 

and businesses), and advance efficiency improvements in motor systems and other industrial 

processes. Demand-side initiatives can also directly reduce energy consumption, such as through 

programs encouraging changing the thermostat during the hours a building is unoccupied or 

motion-detecting room light switches. Such demand-side energy efficiency initiatives directly 

affect employment by encouraging firms and consumers to shift to more efficient products and 

processes than would otherwise be the case. Employment in the sectors that provide these more 

efficient devices and services would be expected to increase, while employment in the sectors 

that produce less efficient devices would be expected to contract. 

This analysis uses the cost projections from the engineering-based Integrated Planning 

Model (IPM) to project labor demand impacts of the proposed guidelines for the electricity 

generation sector (fossil, renewable, and nuclear), and the fuel production sector (coal and 

natural gas). These projections include effects attributable to heat rate improvements, 

construction of new EGUs, changes in fuel use, and reductions in electricity generation due to 

demand side energy efficiency activities. To project labor requirements for demand side energy 

efficiency activities, the analysis uses a different approach that combines data on historic 

changes in employment and expenditures in the energy efficiency sector with projected changes 

in expenditures in the sector arising from state implementation of the proposed guidelines. 

We project labor impacts for two options for establishing the “best system of emission 

reduction” (BSER) for GHG emissions from existing EGUs. The EPA is proposing a BSER goal 

approach referred to as Option 1 and taking comment on a second approach referred to as Option 

2. Option 1 has a relatively stringent target, but allows a longer timeframe to comply (2030). 

Option 2 has a less stringent target with a shorter timeframe (2025). This analysis estimates labor 

impacts of illustrative state and regional compliance approaches for the goals set for Options 1 

and 2. With the state compliance approach, states are assumed to comply with the guidelines by 

implementing measures solely within the state. Under the regional approach, states may form 

regional groups to comply with the guidelines. 
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6.6.1 Projected Changes in Employment in Electricity Generation and Fossil Fuel 

Extraction 

The analytical approach used in this analysis is a bottom-up engineering method 

combining EPA’s cost analysis of the proposed guidelines with data on labor productivity, 

engineering estimates of the amount and types of labor needed to manufacture, construct, and 

operate different types of generating units, and prevailing wage rates for skilled and general 

labor categories. This approach is different from the types of economic analyses discussed in 

Section 6.3. Rather than projecting employment impacts throughout the U.S. economy, the 

engineering based analysis focuses on the direct impact on labor demand in industries closely 

involved with electricity generation. The engineering approach projects labor changes measured 

as the change in each analysis year in job-years158 employed in the power generation and directly 

related sectors (e.g., equipment manufacturing, fuel supply and generating efficiency services). 

For example, this approach projects the amounts and types of labor required to implement 

improvements in generating efficiency. It then uses the EPA’s estimated effect of efficiency 

improvements on fuel demand to project reductions in the amount of labor required to produce 

coal and gas. 

This analysis relies on projections and costing analysis from the IPM, which uses industryspecific data and assumptions to estimate costs and energy impacts of the proposed guidelines 

(see Chapter 3). The EPA uses the IPM to predict coal generating capacity that is likely to 

undertake improvements in heat rate efficiency (HRI).159 IPM also predicts the guidelines’ 

impacts on fuel use, retirement of existing units, and construction of new ones. 

The methods we use to estimate the labor impacts are based on the analytical methods used 

in the Regulatory Impact Analysis for the Mercury and Air Toxics Standards (MATS). While the 

methods used in this analysis to estimate the recurring labor impacts (e.g., labor associated with 

operating and maintaining generating units, as well as labor needed to mine coal and natural gas) 

are the same as we used in MATS (with updated data where available), the methods used to 

 

158 Job-years are not individual jobs, but rather the amount of work performed by the equivalent of one full-time 

individual for one year. For example, 20 job-years in 2020 may represent 20 full-time jobs or 40 half-time jobs 

in that year. 

159 Heat rate improvements could include a range of activities in the power plant to lower the heat rate required to 

generate a net electrical output. Assuming all other things being equal, a lower heat rate is more efficient because 

more electricity is generated from each ton of coal. 
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estimate the labor associated with installing new capacity and implementing heat rate 

improvements were developed for the GHG guidelines analysis. 

The bottom up engineering based labor analysis in the MATS RIA primarily was 

concerned with the labor needs of retrofitting pollution control equipment. A central feature of 

the GHG guidelines labor analysis, however, involves the quantity and timing of the labor needs 

of building new renewable (primarily wind) and natural gas combined cycle (CC) generating 

capacity. The EPA IPM analysis finds that by 2020 a significantly larger amount of renewable 

and CC capacity will be built to implement the GHG guidelines under all of the option scenarios. 

For example, in the base case IPM estimates that 11 GW of non-hydro renewable capacity will 

be built between 2016 and 2020, while under Option 1 with regional compliance almost twice as 

much (21.3 GW) renewable capacity will be built. Similarly, in the base case 7.9 GW of CC 

capacity is built between 2016 and 2020, while almost 3 times as much (24.43 GW) is built 

under Option 1 with regional compliance. 

An important aspect of building new units is that all of the construction-related labor 

occurs before the new units become operational. While the financial costs of building the new 

units are amortized and recouped over the book life of the new equipment, the labor involved 

with manufacturing equipment and constructing the new units occurs, and is actually paid for, in 

a concentrated amount of time before the new capacity begins to generate electricity. IPM 

assumes160 that new CC units take 3 years to build, and both natural gas combustion turbines and 

wind powered renewables take 2 years. 

In addition to the amount of labor needed to build new generating capacity, IPM also 

estimates that there will be significant labor impacts in later years from avoiding having to build 

additional new capacity. Because of the demand-side energy efficiency programs, the total 

amount of electricity needed by 2030 is substantially lower with all of the Options than in the 

base case. For example, in Option 1 with regional compliance only half the total new CC 

capacity is built between 2016 and 2030 (40.6 GW), compared with 79.7 GW in the base case. 

The avoided new capacity results in both a significant net cost savings to consumers and the 

power sector, as well reduced emissions of both CO2 and precursor pollutants from fossil fuel 

generation. The avoided needed to build new capacity, however, also has significant labor 

 

160 Table 4.7, IPM 5.13 Documentation. 
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impacts. A portion of the employment that would have been used to build the new capacity in the 

base case will not occur with the implementation of the GHG guidelines. Similarly, less labor 

involved with operating and providing fuel for new units will be needed with the GHG 

guidelines than in the base case. 

Overall, the impact of much more rapid construction of new renewable and fossil 

generation capacity in the early years of implementing the GHG guidelines, followed by the need 

to build substantially less capacity in later years as the demand-side energy efficiency programs 

reduce the overall electricity demand relative to the base case, creates an important but complex 

temporal dynamic to the supply side labor analysis. In the early years of implementation there 

will be a sizable net increase in the amount of labor needed to construct and operate the new 

generating capacity. However in later years the reduced need for additional newly built capacity 

results in a sizable net decrease in the amount of labor needed relative to the base case. 

The changes in the timing and overall need for new capacity have direct labor impacts not 

only on the construction-related one time labor, but also on the subsequent needs for operating 

and fuel supply labor to operate the plants. In the case of avoided new capacity, the labor 

impacts include the loss of those ongoing labor needs. In addition, there are similar labor impacts 

from the loss of operating and fuel related jobs arising from the retirement of existing coal 

generating capacity. 

A critical component of the overall labor impacts of implementing the GHG guidelines is 

the impact of the labor associated with the demand-side energy efficiency activities. The 

demand side labor impacts are presented in Section 6.6.2. All of the labor impacts of the 

demand-side energy efficiency activities are increases in labor needs, which more than offset the 

loss of supply-side jobs associated with the decreasing demand for electricity arising from the 

demand-side programs.The IPM labor expenditure projections are distributed across different 

labor categories (e.g., general construction labor, boilermakers and engineering) using data from 

engineering analyses of labor’s overall share of total expenditures, and apportionment of total 

labor cost to various labor categories. Hourly labor expenditures (including wages, fringe 

benefits, and employer-paid costs including taxes, insurance and administrative costs) for each 

category are used to estimate the labor quantity (measured in full time job-years) consistent with 

the compliance scenario projections. Projected labor impacts arising from changes in fuel 
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demand are primarily derived from labor productivity data for coal mining (tons mined per 

employee hour) and natural gas extraction (MMBtu produced/job-year). Tables 6.4 and 6.5 

present projected changes relative to the baseline of four labor categories: 

1. manufacturing, engineering and construction for building, designing and implementing 

heat rate improvements; 

2. manufacturing and construction for new generating capacity; 

3. operating and maintenance for existing generating capacity; and 

4. extraction of coal and natural gas fuel. 

All of the employment estimates presented in Tables 6-4 and 6-5 are estimates occurring in 

a single year. For the construction-related (one time) labor impacts, including the installation of 

HRI, Tables 6-4 and 6-5 present the average annual impact occurring in each year of three 

different intervals of years. The multi-year intervals correspond with the analytical years 

reported by IPM. The three intervals are from 2017 through 2020 (a four year interval), from 

2021 through 2025 (5 years), and 2026 through 2030 (5 years). The construction-related labor 

analysis are based on the IPM estimates of the net change in capital investment that occurs 

during each multi-year interval to fund building new units completed during that interval. The 

new built labor analysis uses the net change in capital investment to estimate the amount and 

type of labor needed during the interval to build the new capacity. The analysis assumes that the 

new built labor within each interval is evenly distributed throughout the interval. Tables 6-4 and 

6-5 reflect this assumption by presenting the average labor utilization per year during each of the 

3 intervals. 

The HRI-related labor impact are estimated based on the assumed capital cost of $100/kw 

(see Section 3.7.3). Note that all of the HRI-related labor impacts occur in the first interval (2017 

to 2020), and are assumed to be occur evenly throughout that four year interval. Therefore, the 

HRI-related labor estimates in Tables 6-4 and 6-5 are the annual average labor impacts for of the 

4 years. There are no HRI improvements made after 2020. 

The labor estimates for operating and maintaining generating units annually are based on 

IPMs estimates of Fixed Operating and Maintenance (FOM) Costs. IPM estimates FOM for 

each year individually, so the net changes in O&M-related labor estimates in Tables 6-4 and 6-5 
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are single year estimates for 2020, 2025 and 2030. These O&M labor estimates are not the 

average annual averages labor needs throughout each multi-year interval. There are O&M labor 

changes occurring in the all years throughout the entire period 2017-2030, but labor impact 

changes each year. The fuels-related labor estimates are also single-year estimates, and not 

multi-year averages. The labor analysis uses IPM’s estimates of the net changes in the amount of 

coal and natural gas in 2020, 2025 and 2030, which are inherently estimates of the fuel usage in a 

single year. As with the O&M labor impacts, the fuels-related labor impacts occur in every year 

throughout 2017-2030, and the labor impact changes every year. 

It should be noted that the supply side labor impact estimates in Tables 6-4 and 6-5 reflect 

all the supply side changes that will occur with each alternative option and compliance 

alternative. These labor impacts include not only the impacts of Building Blocks 1 through 3, but 

also the changes in total generation needed that result from the demand-side energy efficiency 

activities in Building Block 4. The additional upstream labor impacts from the demand side 

activities are presented below in Section 6.2.2. 

More details on methodology, assumptions, and data sources used to estimate the supplyside labor impacts discussed in this section can be found in Appendix 6A. 

 Deleted: ¶
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Table 6-4. Engineering-Baseda Changes in Labor Utilization, Regional Compliance 

Approach - (Number of Job-Yearsb

 of Employment in A Single Year)

Category Option 1 Option 2 

Construction-related (Onetime) Changes*

2017-2020 2021-2025 2026-2030 2017-2020 2021-2025 2026-2030 

Heat Rate Improvement: 

Total 

32,900 0 0 33,900 0 0 

Boilermakers and 

General Construction 

22,800 0 0 23,600 0 0 

Engineering and 

Management 

6,000 0 0 6,200 0 0 

Equipment-related 2,900 0 0 3,000 0 0 

Material-related 1,100 0 0 1,100 0 0 

New Capacity Construction: 

Total 

24,700 -33,300 -37,000 14,700 -23,100 -29,600 

Renewables 17,000 -4,700 -2,100 11,600 -3,100 -4,000 

Natural Gas 7,700 -28,600 -34,900 3,100 -20,000 -25,600 

Recurring Changes** 

 2020 2025 2030 2020 2025 2030 

Operation and Maintenance: 

Total 

-22,900 -23,800 -23,700 -15,300 -15,500 -16,600 

Changes in Gas 2,300 -600 -3,400 1,000 -1,000 -3,900 

Retired Coal -22,600 -20,800 -18,200 -14,600 -13,100 -11,500 

Retired Oil and Gas -2,600 -2,400 -2,100 -1,700 -1,400 -1,200 

Fuel Extraction: Total -8,800 -14,900 -19,200 -6,600 -10,600 -13,300 

Coal -13,700 -17,000 -16,600 -10,900 -12,900 -10,300 

Natural Gas 4,900 2,100 -2,600 4,300 2,300 -3,000 

Supply Side Employment 

Impacts - Quantified 

25,900 -72,000 -79,900 26,700 -49,200 -58,600 

a

 Job-year estimates are derived from IPM investment and O&M cost estimates, as well as IPM fuel use estimates 

(tons coals or MMBtu gas). 

b

All job-year estimates on this are full time equivalent (FTE) jobs. Job estimates in the Demand-Side energy 

efficiency section (below) include both full time and part time jobs. 

*Construction-related job-year changes are one-time impacts, occurring during each year of the 2 to 4 year period 

during which construction and HRI installation activities occur. Figures in table are average job-years during each of 

the years in each range. Negative job-year estimates when additional generating capacity must be built in the base 

case, but is avoided in the Guideline implementation scenarios due to HRI or Demand-side energy efficiency 

programs. 

**Recurring Changes are job-years associated with annual recurring jobs including operating and maintenance 

activities and fuel extraction jobs. Newly built generating capacity creates a recurring stream of positive job-years, 

while retiring generating capacity, as well as avoided new built capacity, create a stream of negative job-years. In 

addition, there are recurring jobs prior to 2020 to fuel and operate new generating capacity brought online before 

2020; the recurring jobs prior to 2020 are not estimated. 
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Table 6-5. Engineering-Baseda

 Changes in Labor Utilization, State Compliance Approach - 

(Number of Job-Years of Employment in Year)

Category Option 1 Option 2 

Construction-related (Onetime) Changes* 

 2017-2020 2021-2025 2026-2030 2017-2020 2021-2025 2026-2030 

Heat Rate Improvement: 

Total 

32,200 0 0 30,800 0 0 

Boilermakers and General 

Construction 

22,400 0 0 21,400 0 0 

Engineering and Management 5,900 0 0 5,700 0 0 

Equipment-related 2,900 0 0 2,800 0 0 

Material-related 1,000 0 0 1,000 0 0 

New Capacity Construction: 

Total 

28,200 -38,000 -36,100 23,000 -29,500 -25,300 

Renewables 19,100 -8,900 -2,200 15,800 -6,300 -2,400 

Natural Gas 9,100 -29,100 -33,900 7,200 -23,200 -22,900 

Recurring Changes** 

 2020 2025 2030 2020 2025 2030 

Operation and Maintenance: 

Total 

-24,100 -25,300 -24,900 -16,800 -17,100 -16,800 

Changes in Gas 2,500 -500 -3,200 1,500 -800 -2,600 

Retired Coal -24,000 -22,500 -19,700 -16,400 -14,800 -12,900 

Retired Oil and Gas -2,600 -2,300 -2,000 -1,900 -1,500 -1,300 

Fuel Extraction: Total -8,300 -14,600 -19,400 -6,500 -10,300 -13,400 

Coal -14,300 -17,800 -18,000 -11,500 -13,500 -11,600 

Natural Gas 6,000 3,200 -1,400 5,000 3,200 -1,800 

Supply Side Employment 

Impacts – Quantified 

28,000 -77,900 -80,400 29,800 -56,900 -55,500 

a

 Job-year estimates are derived from IPM investment and O&M cost estimates, as well as IPM fuel use estimates 

(tons coals or MMBtu gas)

b

All job-year estimates on this are Full Time Equivalent (FTE) jobs. Job estimates in the Demand-Side energy 

efficiency section (below) include both full time and part time jobs

*Construction-related job-year changes are one-time impacts, occurring during each year of the 2 to 4 year period 

during which construction and HRI installation activities occur. Figures in table are average job-years during each of 

the years in each range. Negative job-year estimates when additional generating capacity must be built in the base 

case, but is avoided in the Guideline implementation scenarios due to HRI or Demand-side energy efficiency 

programs. 

**Recurring Changes are job-years associated with annual recurring jobs including operating and maintenance 

activities and fuel extraction jobs. Newly built generating capacity creates a recurring stream of positive job-years, 

while retiring generating capacity, as well as avoided new built capacity, create a stream of negative job-years. In 

addition, there are recurring jobs prior to 2020 to fuel and operate new generating capacity brought online before 

2020; the recurring jobs prior to 2020 are not estimated.
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6.6.2 Projected Changes in Employment in Demand-Side Energy Efficiency Activities 

EPA anticipates that this rule will stimulate investment in clean energy technologies and 

services, resulting in considerable increases in energy efficiency in particular. We expect these 

increases in energy efficiency, specifically, to support a significant number of jobs existing in 

related industries. 

 In this section, we project employment impacts in demand-side energy efficiency 

activities arising from these guidelines. The approach uses information from power sector 

modeling and projected impacts on energy efficiency investments analyzed as part of building 

block four (see Chapter 3), and U.S. government data on employment and expenditures in energy 

efficiency. This approach is limited by the fact that we do not know which options states will 

choose for demand-side energy efficiency activities. These employment projections are gross, in 

the sense that they do not include impacts of any shift in resources from other sectors. Nor does 

this analysis attempt to quantify employment impacts arising from changes in consumer 

expenditures away from energy towards other sectors. EPA requests public comment on all 

aspects of this proposed approach to partially quantifying demand-side management and energy 

efficiency employment impacts. 

Investments in demand-side energy efficiency reduce energy required for a given activity 

by encouraging more efficient technologies (e.g., ENERGY STAR appliances), implementing 

energy improvements for existing systems (e.g., weatherization of older homes), or encouraging 

changes in behavior (e.g., reducing air conditioning during periods of high electricity demand). 

Employment impacts of demand-side energy efficiency programs have not been 

extensively studied in the peer-reviewed, published economics literature. Instead, most research 

has focused on consumer response to and amount of energy savings achieved by these programs 

(e.g., Allcott (2011a, 2011b), Arimura et. al (2012)). Results suggest that demand-side energy 

efficiency programs reduce energy use and generate small increases in consumer welfare. These 

policy impacts are due to low investment in energy efficiency as described in “energy paradox” 

literature (Gillingham, Newell, and Palmer (2009), Gillingham and Palmer (2014)).161

 

161 For more information on this efficiency paradox see Chapter 3. 
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Two recent articles discuss employment effects of demand-side energy efficiency 

programs. Aldy (2013) describes clean energy investments funded by the American Recovery 

and Reinvestment Act of 2009, which “included more than $90 billion for strategic clean energy 

investments intended to promote job creation and the deployment of low-carbon technologies” 

(p. 137), with nearly $20 billion for energy efficiency investments. The Council of Economic 

Advisors (CEA) (2011) estimated higher economic activity and employment than would have 

otherwise occurred without the American Recovery and Reinvestment Act. Using CEA’s 

methods to quantify job creation for the Recovery Act, Aldy uses the share of stimulus funds for 

clean energy investments to estimate job-years supported by the Recovery Act. The largest 

sources of job creation in clean energy are those that received the largest shares of stimulus 

funds: renewable energy, energy efficiency, and transit. Aldy’s estimates, while informative, are 

not directly applicable for employment analysis in this rulemaking as there are important 

differences in expected employment impacts from a historically large fiscal stimulus specifically 

targeting job creation during a period of exceptionally high unemployment versus environmental 

regulations taking effect several years from now. 

Yi (2013) analyzes clean energy policies and employment for U.S. metropolitan areas in 

2006, prior to the Recovery Act, to evaluate impacts on clean energy job growth. Implementing 

an additional state clean energy policy tool (renewable energy policies, greenhouse gas 

emissions policies, and energy efficiency polices such as energy efficiency resource standards, 

appliance or equipment energy efficiency standards, tax incentives, and public building energy 

efficiency standards) is associated with 1% more clean energy employment within that MSA. 

These estimates are not transferable to this rulemaking since states are likely to change intensity 

as well as number of clean energy programs. 

Outside of the peer-reviewed, published economics literature, analysts have estimated 

employment effects of existing and proposed state and regional demand-side energy efficiency 

policies, programs and investments. While these studies may use modeling approaches that 

would not be appropriate for national-level analyses or may include job impacts not considered 

in this chapter, they are often used by state government officials in their decision-making 

process. As such, they can provide useful insights as to how states analyze demand-side energy 

efficiency activities. Deleted: Appendix A6.C.1 Other Approaches to 

Estimating Employment Effects of Demand-side 

Energy Efficiency Policies and Programs, Including 

State Examples presents several of these studies.
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 Lacking a peer-reviewed methodology, we propose the following approach to illustrate 

potential effects on labor demand in the energy efficiency sector due to demand side 

management strategies. We use U.S. government data to divide the historical change in 

employment in the energy efficiency sector by the historical change in expenditure in the sector 

and multiply this fraction by projected expenditure in the sector undertaken in response to these 

proposed guidelines. 

Data used for calculating the numerator of the fraction comes from the “energy efficiency” 

category of the 2010 and 2011 BLS Green Goods and Services surveys.162 BLS does not report 

the denominator of the job per additional dollar fraction, however. Instead, the data include the 

fraction of green revenues received relative to total revenues in each NAICS code.163 We 

multiply data on total revenues by NAICS by the fraction of green revenues reported by BLS to 

obtain green revenues. The only U.S. Government data source containing this revenue 

information for all NAICS sectors is the U.S. Economic Census. This Census is conducted at 5-

year intervals (the latest available year is 2007), however, making it unsuitable for identifying 

the change in revenues from 2010 to 2011. Instead, we use data from the Annual Survey of 

Manufacturers. The disadvantage of this data source is that the manufacturing sector makes up 

only 50 percent of the 132 NAICS codes belonging to the energy efficiency sector as defined by 

the BLS Green Goods and Services surveys, with the remainder in the construction or service 

sectors. Thus, this analysis implicitly assumes that the same number of jobs per dollar are 

supported in construction and service sectors as in manufacturing. Using this approach we obtain 

a factor of 2.56 additional demand side energy efficiency jobs per additional million 2011 dollars 

of expenditure. 

Having calculated the fraction of additional jobs per additional dollar of energy efficiency 

expenditure, we use energy sector model projections of the first-year costs required for states to 

attain the goal of demand side efficiency improvements set by building block four.164 

Multiplying this dollar expenditure by the jobs per additional dollar figure results in projected 

employment impacts for demand-side energy efficiency activities of 78,800 in 2020, 112,000 in 

 

162For more details on these surveys, see section 7.5.3. 

163 See detailed listing available here: http://www.bls.gov/ggs/naics_2012.xlsx. 

164 See Greenhouse Gas Abatement Measures TSD, Appendix 5-4. 
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2025, and 111,800 in 2030 for both the proposed Option 1 regional and state compliance 

approaches. The estimates for Option 2 are shown on Table 6-6 below. 

 Table 6-6. Estimated Demand-Side Energy Efficiency Employment Impacts 

 For Option 1 and Option 2 for Both Regional and State Compliance Approaches 

 Employment impact (jobs)* 

 Option 1 Option 2 

Source Factor 2020 2025 2030 2020 2025 2030 

BLS GGS 

additional jobs 

per additional 

million dollars 

2.56 78,800 112,000 111,800 57,000 76,200 77,200 

*Since these figures represent number of employees (full or part time) they should not be added to the full-time 

equivalent job-years reported in Table 6-5.Although this approach has the advantage of illuminating the 

change in jobs for an incremental change in expenditures, this approach is limited by its focus on 

manufacturing sectors and direction of bias (overestimation or underestimation) cannot be 

determined at this time. The EPA is requesting comment on this method, data, identification of 

related studies and peer reviewed articles and other methods. 

There is more uncertainty involved in this approach than the standard bottom-up 

engineering analysis used to estimate electricity generation and fuel production employment 

impacts of this rulemaking. For those, the EPA was able to identify a limited set of activities 

(e.g., constructing a new NGCC power plant), and study associated labor requirements. Demandside energy efficiency improvements, in contrast, encompass a wide array of activities (subsidies 

for efficient appliances, “smart meters,” etc.). In addition, there is considerable uncertainty 

regarding which activities a state will choose. Thus, the validity of the jobs per dollar approach 

used here relies on the assumption that states will use a mix of activities similar to the 2011 

composition of energy efficiency sectors identified by BLS. 

In addition, the EPA does not have access to bottom-up information regarding labor 

requirements for these activities. Use of a constant job per dollar fraction is at best a crude 

approximation of these labor requirements. The EPA has identified several other limitations of 

this approach, outlined below. 

Job Reclassification. Job numbers in this chapter represent gross changes in the affected sector. 

As such they may over-estimate impacts to the extent that jobs created displace workers 

Comment [A85]: EPA believes that it has 

appropriately included analysis quantifying end-useenergy efficiency jobs in the RIA. Since end-use 

energy efficiency expenditures are such a large 

component of the rulemaking, the EPA feels it would 

be remiss not to attempt to quantify their 

employment impact. EPA feels it has made the best 

projection possible given the official data and 

methods available. The EPA also feels it has 

provided the reader with extensive caveats about the 

approach, and solicited comment regarding other 

methods or data sources. 
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employed elsewhere in the economy. For demand-side efficiency activities this potential overstatement is may be higher than in other sectors. If states encourage consumers to purchase 

ENERGY STAR appliances, for example, currently employed workers in factories and retail 

outlets may simply be given a different task. This approach, however, would count these workers 

as jobs created 

Imports. The job per additional dollar fraction used in the employment projection is calculated 

based on jobs per dollar of revenue for domestic firms only. To the extent that spending on 

demand-side energy efficiency activities goes toward the purchase of imported goods this 

projection will overstate the U.S. employment impact of those expenditures.

Fixed Coefficient. Implicit in this approach is the assumption that employment impacts can be 

projected decades into the future on the basis of a single calculation from 2010-2011 data. The 

labor intensity of demand side energy efficiency will likely change with technological innovation 

in the sector. In addition, even absent technological change, labor intensity of expenditures will 

likely change over time as states alter their portfolio of efficiency activities (e.g., by moving to 

higher cost activities after exhausting opportunities for low cost efficiency gains). 

Non-additional Activities. Here we assume that all activities financed by demand side energy 

efficiency expenditures are additional to what would have been undertaken in the absence of 

these programs. If utilities finance some actions customers would have undertaken in the absence 

of these programs (e.g., if a customer receives a rebate for an energy efficient appliance that 

would have been purchased without the rebate), these numbers would over-estimate employment 

impacts of the proposed guidelines. 

6.7 Conclusion 

This chapter presents qualitative and quantitative discussions of potential employment 

impacts of the proposed guidelines for electricity generation, fuel production, and demand-side 

energy efficiency sectors. The qualitative discussion identifies challenges associated with 

estimating net employment effects and discusses anticipated impacts related to the rule. It 

includes an in-depth discussion of economic theory underlying analysis of employment impacts. 

Labor demand impacts for regulated firms can be decomposed into output and substitution 

effects, both of which may be positive or negative. Consequently, theory alone cannot predict the 

direction or magnitude of a regulation’s employment impact. It is possible to combine theory 

with empirical study specific to the regulated firms and other relevant sectors if data and 

methods of sufficient detail and quality are available. Finally, economic theory suggests that 

labor supply effects are also possible. 

We examine the peer-reviewed economics literature analyzing various aspects of labor 

demand, relying on the above theoretical framework. Determining the direction of employment 
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effects in regulated industries is challenging because of the complexity of the output and 

substitution effects. Complying with a new or more stringent regulation may require additional 

inputs, including labor, and may alter the relative proportions of labor and capital used by 

regulated firms (and firms in other relevant industries) in their production processes. The 

available literature illustrates some of the difficulties for empirical estimation: studies sometimes 

rely on confidential plant-level employment data from the U.S. Census Bureau, possibly 

combined with pollution abatement expenditure data that are too dated to be reliably informative. 

In addition, the methods do not permit estimation of net economy-wide effects. Empirical 

analysis at the industry level requires estimates of product demand elasticity; production factor 

substitutability; supply elasticity of production factors; and the share of total costs contributed by 

wages, by industry, and perhaps even by facility. For environmental rules, many of these data 

items are not publicly available, would require significant time and resources in order to access 

confidential U.S. Census data for research, and also would not be necessary for other 

components of a typical RIA. Econometric studies of environmental rules converge on the 

finding that employment effects, whether positive or negative, have been small in regulated 

sectors. 

Quantitative analysis in this chapter projects a subset of potential employment impacts in 

the electricity generation, fuel production, and demand-side energy efficiency sectors. States 

have the responsibility and flexibility to implement policies and practices for compliance with 

Proposed Electric Generating Unit Greenhouse Gas Existing Source Guidelines. As such, given 

the wide range of approaches that may be used, quantifying the associated employment impacts 

is difficult. EPA’s employment analysis includes projected employment impacts associated with 

these guidelines for the electric power industry, coal and natural gas production, and demandside energy efficiency activities. These projections are derived, in part, from a detailed model of 

the electricity production sector used for this regulatory analysis, and U.S government data on 

employment and labor productivity. In the electricity, coal, and natural gas sectors, the EPA 

estimates that these guidelines could have an employment impact of roughly 25,900 job-years in 

2020 for Option 1 and 26,700 for Option 2 of that same year (see Tables 6-4 and 6-5). 

Employment impacts from demand-side energy efficiency activities are based on historic data on 

jobs supported per dollar of expenditure. Demand-side energy efficiency employment impacts 

would approximately be 78,800 jobs in 2020 for both Option 1 regional and state compliance 
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approaches (see Table 6-6). The IPM-generated job-year numbers for the electricity, coal and 

natural gas sectors should not be added to the demand-side efficiency job impacts since the 

former are reported in full time equivalent jobs, whereas the latter do not distinguish between full 

and part time employment. Finally, note again that this is an illustrative analysis, and CAA 

section 111(d) allows each state to determine the appropriate combination of, and the extent of 

its reliance on, measures for its state plan, by way of meeting its state-specific goal. Given the 

flexibilities afforded states in complying with the emission guidelines, the impacts reported in 

this chapter are illustrative of compliance actions states may take. 

Deleted: ¶

¶

¶

¶

¶

¶

¶

¶
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6.8 References 

Aldy, J.E. 2013. “A Preliminary Assessment of the American Recovery and Reinvestment Act’s 

Clean Energy Package.” Review of Environmental Economics and Policy, vol. 7, issue 1, 

Winter, pp. 136-155. 

Allcott, H. 2011a. “Social Norms and Energy Conservation.” Journal of Public Economics,

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APPENDIX 6A: ESTIMATING SUPPLY-SIDE EMPLOYMENT IMPACTS OF THE 

PROPOSED EGU GHG EXISTING SOURCE GUIDELINES

This appendix presents the methods used to estimate the supply-side employment impacts 

of the EGU GHG Existing Source Guidelines. The focus of the employment analysis is limited to 

the direct changes in the amount of labor needed in the power, fuels and generating equipment 

sectors directly influenced by compliance with the Guidelines. It does not include the ripple 

effects of these impacts on the broader economy (i.e., the “multiplier” effect), nor does it include 

the wider economy-wide effects of the changes to the energy markets, such as changes in 

electricity prices. 

The methods used to estimate the supply-side employments are based on methods 

previously developed for the Mercury and Air Toxics Standards (MATS) Regulatory Impact 

Analysis (RIA). The methods used in this analysis to estimate the recurring labor impacts (e.g., 

labor associated with operating and maintaining generating units, as well as labor needed to mine 

coal and natural gas) are the same as was used in MATS (with updated data where available). 

The labor analysis in the MATS RIA was primarily concerned with the labor needs of 

retrofitting pollution control equipment. The EGU GHG Existing Source guidelines labor 

analysis, however, involves the quantity and timing of the labor needs of building new renewable 

and natural gas, as well as making heat rate improvements at existing coal fired EGUs. These 

construction-related compliance activities in the EGU GHG Existing Source guidelines required 

developing additional appropriate analytical methods that were not needed for the MATS 

analysis. The newly developed analytical methods for the construction-related activities are 

similar in structure and overall approach to the methods used in MATS, but required additional 

data and engineering information not needed in the MATS RIA. 

A6.1 General Approach 

The analytical approach used in this analysis is a bottom-up engineering method 

combining the EPA’s cost analysis of the proposed guidelines with data on labor productivity, 

engineering estimates of the amount and types of labor needed to manufacture, construct, and 

operate different types of generating units, and prevailing wage rates for skilled and general 

labor categories. The approach involved using power sector projections and various energy 
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market implications under the proposed EGU GHG Existing Source guidelines from modeling 

conducted with the EPA Base Case version 5.13, using the Integrated Planning Model (IPM®)[

1

], 

along with data from secondary sources, to estimate the first order employment impacts for 2020, 

2025, and 2030. 

Throughout the supply-side labor analysis the engineering approach projects labor changes 

measured as the change in each analysis year in job-years[

2

] employed in the power generation 

and directly related sectors (e.g., equipment manufacturing, fuel supply and generating efficiency 

services). Job-years are not individual jobs, nor are they necessarily permanent nor full time jobs. 

Job-years the amount of work performed by one full time equivalent (FTE) employee in one 

year. For example, 20 job-years in 2020 may represent 20 full-time jobs or 40 half-time jobs in 

that year, or any combination of full and part time workers such that total 20 FTEs. 

6A.1.1 Employment Effects Included In the Analysis 

The estimates of the employment impacts (both positive and negative) are divided into five 

categories: 

 additional employment to make heat rate improvements[

3

] (HTI) at existing coal fired 

EGUs; 

 additional construction-related employment to manufacture and install additional new 

generating capacity (renewables, and natural gas combined cycle or combustion turbine 

units) when needed as part of early compliance actions; 

 lost construction-related employment opportunities due to reductions in the total amount 

of new generating capacity needed to be built in the later years because of reduced 

overall demand for electricity because of demand-side energy efficiency activities; 

 lost operating and maintenance employment opportunities due to increased retirements of 

coal and small oil/gas units; 

 changes (both positive and negative) in coal mining and natural gas extraction 

employment due to the aggregate net changes in fuel demands arising from all the 

activities occurring due to compliance with the proposed guidelines. 

 

Some of the changes are one-time labor effects which are associated with the building (or 

avoiding building) new generating capacity and installing HRI. This type of employment effects 

involves project-specific labor that is used for 2 to 4 years to complete a specific construction 
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and installation type of project. There are other labor effects, however, which continue year after 

year. For example, bringing new generating capacity online creates an ongoing need for labor to 

operate and maintain the new generating capacity throughout the expected service life of the 

unit. New generating capacity also creates a need for additional employment to provide the fuel 

annually to run the new capacity. There are also continuing effects from the lost O&M and fuel 

sector labor opportunities from decisions to retire existing capacity, as well as similar lost labor 

opportunities from decisions to reduce a portion of the amount of additional capacity needed in 

the base case. 

A6.2 Employment Changes due to Heat Rate Improvements 

The employment changes due to heat rate improvement (HRI) were estimated based on the 

incremental MW capacity estimated to implement such improvements by 2020 as indicated by 

the analysis conducted by EPA. The heat rate improvement job impacts were assumed to have 

all occurred by 2020 and thus this study assumes there will be no HRI related jobs after 2020 

(i.e. no permanent O&M related jobs due to HRI for 2025 or 2030). EPA modeled the heat rate 

improvements exogenously in IPM using the assumption that all “relevant” units can improve 

their heat rate by 6 percent at a capital cost of $100/kW. This study assumes that these 

investments will occur over a four-year period culminating in 2020. Hence, the per-year cost of 

heat rate was calculated to be $25/kW, and this cost was used in the next step. 

This cost was then allocated to four categories based on the estimates provided by Andover 

Technology Partners (ATP), which were adapted from proxy projects involving installation of 

combustion control retrofits, such as those installed under the Best Available Retrofit 

Technology (BART) submissions from coal-fired power plants located in Wyoming and 

Arizona. For more details, refer to the Staudt (2014) report.[4] These proxies were chosen to 

ensure that the types of activities involved and their associated costs would be representative of 

those investments EPA expects power plants to undertake for efficiency upgrades. 

Information on cost for these proxies were then extrapolated to approximate the labor 

requirements for four broad categories of labor – boilermakers and general construction, 

engineering and management support labor, labor required to produce the equipment in upstream 

sectors, and labor required to supply the materials (assumed to be primarily steel) in upstream 

sectors. More details about these estimates are provided in the Staudt (2014) report. 
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Based on the cost allocated in each categories and output per worker figures for respective 

industries in 2020, the employment gains for heat rate improvement were estimated[5] for 2020 

using the assumptions summarized in Table 6A-1 below. Output per workers in future years 

were adjusted to account for growth in labor productivity, based on historical evidence of 

productivity growth rates for the relevant sectors. 

Table 6A-1. Labor Productivity Growth Rate due to Heat Rate Improvement 

 Share of the Total 

Capital Cost 

Output/Worker 

(2020) 

Labor Productivity 

Growth Rate 

Boilermaker and Gen. 

Const. 

40% $78,500 0% 

Management/Engineering 20% $141,000 1.3% 

Equipment 30% $458,000 3.2% 

Materials 10% $424,000 -1.2% 

 

For these output per worker figures, a power sector construction industry (NAICS 237130) 

was used for general construction and boilermakers, Engineering Services (NAICS 54133) was 

used for the engineering and management component, Machinery Manufacturing (NAICS 333) 

was used for the equipment sector, and steel manufacturing (NAICS 33121) was used for 

materials. Use of machinery manufacturing for equipment and steel for materials was based on 

an analysis of the types of materials and equipment needed for these projects, and what EPA 

determined to be the most appropriate industry sectors for those. For more details, refer to the 

Staudt (2014) report. 

A6.2.1 Employment Changes Due to Building (or Avoiding) New Generation Capacity 

Employment changes due to new generation units were based on the incremental changes 

in capacity (MW), capital costs ($MM), and fixed operations and maintenance (FOM) costs 

($MM) between the policy scenario and the base case in a given year. 

New capacities were aggregated by generation type into the following categories: 

• Combined Cycle, 

• Combustion Turbine, and 

• Renewables (which includes biomass, geothermal, landfill gas, onshore wind, and solar). 

For each category, the analysis estimated the impacts due to both the construction and 

operating labor requirements for corresponding capacity changes. The construction labor was 

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estimated using information on the capital costs, while the operating labor was estimated using 

the FOM costs. 

Because IPM outputs provide annualized capital costs ($MM), EPA first converted the 

annualized capital costs to changes in the total capital investment using the corresponding capital 

charge rates.[

6

] These total capital investments were then converted to annual capital investments 

using assumptions about the estimated duration of the construction phase, in order to estimate the 

annual impacts on construction phase labor. Duration estimates were based on assumptions for 

construction lengths used in EPA’s IPM modeling. [

7

] Specific assumptions used for different 

generating technologies are shown in Table 6A-2 below. 

Table 6A-2. Capital Charge Rate and Duration Assumptions 

New Investment 

Technology 

Capital Charge Rate Duration (Years) 

Advanced Combined Cycle 10.3% 3 

Advanced Combustion 

Turbine 

10.6% 2 

Renewables 

Biomass 9.5% 3 

Wind (Onshore) 10.9% 3 

Landfill Gas 10.9% 3 

Solar 10.9% 3 

Geothermal 10.9% 3 

 

Annual capital costs for each generation type were then broken down into four categories: 

equipment, material (which is assumed to be primarily steel), installation labor, and support labor 

in engineering and management. The percentage breakdowns shown in Table 6A-3 were 

estimated using information provided by Staudt (2014), based primarily on published budgets for 

new unit assembled in a study for the National Energy Technology Laboratory (NETL). For 

more details, refer to the Staudt (2014) report. Annual capital costs for each generation type 

provided by the IPM output were allocated according to this breakdown. 

Table 6A-3. Expenditure Breakdown due to New Generating Capacity 

 Equipment Material Labor Eng. and Const. 

Mgt 

Renewables 54% 6% 31% 9% 

Combined 

Cycle 

65% 10% 18% 7% 

Combustion 65% 10% 18% 7% 

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Turbine 

 

The short-term construction labor of the new generation units were based on output ($ per 

worker) figures for the respective sectors. The total direct workers per $1 million of output for 

the baseline year 2007 were forecasted to the years under analysis using the relevant labor 

productivity growth rate. Table 6A-4 shows the figures for each of the five productivities: 

general power plant construction; engineering and management; material use; equipment use; 

and plant operators. The resulting values were multiplied by the capital costs to get the job 

impact. 

Table 6A-4. Labor Productivity due to New Generating Capacity 

 Labor Productivity Growth 

Rate 

Workers per Million $ 

(2007) 

General Power Plant 

Construction 

0.0% 5.7 

Engineering and 

Management 

1.3% 5.2 

Material Use (Steel) -1.2% 2.0 

Equipment Use 

(Machinery) 

3.2% 3.3 

Plant Operators 2.8% 10.8 

 

General installation labor, assumed to be mostly related to the general power plant 

construction phase, was matched with the power industry specific construction sector. 

Engineering/management was matched to the engineering services sector to determine their 

respective output per worker. For materials, EPA assumed steel to be the proxy and used the 

steel manufacturing sector for this productivity. Equipment was assumed to primarily come from 

machinery manufacturing sector (such as turbines, engines and fans). 

The net labor impact for construction labor for a given year was adjusted to account for 

changes in capacity that has already taken place in the prior IPM run year. Because IPM reports 

cumulative changes for new generating capacity for any given run year, this adjustment ensured 

that the short-term construction phase job impacts in any given run year does not reflect the 

cumulative effects of prior construction changes for the given policy scenario. The estimated 

amount of the change in construction-related labor in a single IPM run year (e.g., 2025) 

represents the average labor impact that occurs in all years between that IPM run year and the 

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previous run year (i.e., the labor estimates derived from the 2025 IPM run year are the average 

annual labor impacts in 2021 through 2025). The construction labor results for 2020 represent 

the average labor impacts in 2017 through 2020. 

The plant operating employment estimates used a simpler methodology as the one 

described above. The operating employment estimates use the IPM estimated change in FOM 

costs for the IPM run year. Because the FOM costs are inherently estimates for a single year, the 

operating employment estimates are for a single year only. While there are obviously operating 

employment effects occurring in every year throughout the entire IPM estimation period (2017-

2030), the labor analysis only estimates the single year labor impacts in the IPM run years: 2020, 

2025 and 2030. The total direct workers for $1 million and labor productivity growth rate 

provided for plant operators in Table 6A-4 were used to estimate the employment impact. 

A6.2.2 Employment Changes due to Coal and Oil/Gas Retirements 

Employment changes due to plant retirements were calculated using the IPM projected 

changes in retirement capacities for coal and oil/gas units for the relevant year and the estimated 

changes in total FOM costs due to those retiring units. Thus, the basic assumption in this 

analysis was that increased retirements (over the base case) will lead to reduced FOM 

expenditures at those plants which were assumed to lead to direct job losses for plant workers. 

In order to estimate the total FOM changes due to retirements, EPA first estimated the 

average FOM costs ($/kW) for existing coal-fired and oil/gas-fired units in the base case, as 

shown in Table 6A-5 below. It was assumed that the average FOM cost of existing units in the 

base case can be used as a proxy for the lost economic output due to fossil retirements. Thus, 

changes in the FOM costs for these retiring units were derived by taking the product of the 

incremental change in capacity and the average FOM costs. These values were converted to lost 

employment using data from the Economic Census and BLS on the output/worker estimates for 

the utility sector. [

8

] 

Table 6A-5. Average FOM Cost Assumptions 

 2020 2025 2030 

 Coal 65 68 69 

Oil and Gas 21 22 22 

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 Note that the retirement related employment losses are assumed to include losses directly 

affecting the utility sector, and do not include losses in upstream sectors that supply other inputs 

to the EGU sector (except fuel related job losses, which are estimated separately and discussed in 

the next section). 

A6.2.3 Employment Changes due to Coal and Oil/Gas Retirements 

Two types of employment impacts due to projected fuel use changes were estimated in 

this section. First, employment losses due to either reductions or shifts in coal demand were 

estimated using an approach similar to EPA’s coal employment analyses under Title IV of the 

Clean Air Act Amendments. Using this approach, changes in coal demand (in short tons) for 

various coal supplying regions were taken from EPA’s base and policy case runs for the 

proposed EGU GHG NSPS. These changes were converted to job-years using EIA data on 

regional coal mining productivity (in short tons per employee hour), using 2008 labor 

productivity estimates.[

9

] [

10] 

Specifically, the incremental changes to coal demand were calculated based on the coal 

supply regions in IPM -- Appalachia, Interior, and West and Waste Coal (which was estimated 

using US total productivity). Worker productivity values used for estimating coal related job 

impacts are shown in Table 6A-6 below. 

Table 6A-4. Labor Productivity due to New Generating Capacity 

 Labor Productivity 

Coal (Short tons/ employee hour) 

Appalachia 2.91 

Interior 4.81 

West 19.91 

Waste 5.96 

Natural Gas (MMBtu/ employee hour) 126 

Pipeline Construction (Workers per 

$Million) 

5.1 

 

For natural gas demand, labor productivity per unit of natural gas was unavailable, unlike 

coal labor productivities used above. Most secondary data sources (such as Census and EIA) 

provide estimates for the combined oil and gas extraction sector. This section thus used an 

adjusted labor productivity estimate for the combined oil and gas sector that accounts for the 

relative contributions of oil and natural gas in the total sector output (in terms of the value of 

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energy output in MMBtu). This estimate of labor productivity was then used with the 

incremental natural gas demand for the respective IPM runs to estimate the job-years for the 

specific year (converting the TCF of gas used projected by IPM into MMBtu using the 

appropriate conversion factors). In addition, the pipeline construction costs were estimated using 

endogenously determined gas market model parameters in IPM used by EPA for the MATS rule 

(using assumptions for EPA’s Base Case v4.10). This analysis assumed that the need for 

additional pipeline would be proportionate to those projected for the MATS rule and were hence 

extrapolated from those estimates.[

11] The job-years associated with the pipeline construction 

were included in the natural gas employment estimates. 

 

[

1

] Results for this analysis were developed using various outputs from EPA’s Base Case v.5.13 using ICF’s 

Integrated Planning Model (IPM®). This case includes all of the underlying modeling that was developed by 

EPA with technical support from ICF International, Inc. See 

http://www.epa.gov/powersectormodeling/BaseCasev513.html for more information. 

[

2

] Job-years are not individual jobs, but rather the amount of work performed by the equivalent of one full-time 

individual for one year. For example, 20 job-years in 2020 may represent 20 full-time jobs or 40 half-time jobs 

in that year. 

[

3

] Heat rate improvements could include a range of activities in the power plant to lower the heat rate required to 

generate a net electrical output. Assuming all other things being equal, a lower heat rate is more efficient 

because less fuel is needed per unit of electric output. 

[4] Staudt, James,Andover Technology Partners, Inc. Estimating Labor Effects of Heat Rate Improvements. Report 

prepared for the proposed EGU GHG Existing Source Guidelines, March 6, 2014. 

[

5

] Total value of shipments or receipts in 2007 and total employees were taken from 2007 Economic Census, 

Statistics by Industry for Mining and Manufacturing sectors. The average annual growth rate of labor 

productivity was taken from the Bureau of Labor Statistics. Average growth rate calculated for years 1992-

2007, applied to 2007 productivity to determine 2020 estimates of productivity. For the construction sector, BLS 

productivity growth rate data was unavailable. Because of this, and lack of reliable data on construction sector 

productivity growth, the output per worker for the construction sector was not forecasted to 2020, and the most 

recent available value from 2007 was used. 

[6] Capital charge rates obtained from EPA’s resource, EPA #450R13002: Documentation for EPA Base Case v.5.13 

Using the Integrated Programming Model. 

[

7

] Ibid 

[

8

] The same specific sources as cited before, however, used workers and total payroll. 

[

9

] From US Energy Information Administration (EIA) Annual Energy Review, Coal Mining Productivity Data. 

Used 2008. 

[

10] Unlike the labor productivity estimates for various equipment resources which were forecasted to 2020 using 

BLS average growth rates, this study uses the most recent historical productivity estimates for fuel sectors. In 

general, labor productivity for the fuel sectors (both coal and natural gas) showed a significantly higher degree of 

variability in recent years than the manufacturing sectors, which would have introduced a high degree of 

uncertainty in forecasting productivity growth rates for future years. 
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[

11] See “Employment Estimates of Direct Labor in Response to the Proposed Toxics Rule in 

2015”. Technical Support Document, March 2011. Deleted: ¶

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CHAPTER 7: STATUTORY AND EXECUTIVE ORDER ANALYSIS 

7.1 Executive Order 12866, Regulatory Planning and Review, and Executive Order 13563, 

Improving Regulation and Regulatory Review 

Under Section 3(f) (1) of Executive Order 12866 (58 FR 51735, October 4, 1993), this 

action is an "economically significant regulatory action” because it is likely to have an annual 

effect on the economy of $100 million or more or to adversely affect in a material way the 

economy, a sector of the economy, productivity, competition, jobs, the environment, public 

health or safety, or state, local, or tribal governments or communities. The $100 million 

threshold can be triggered by either costs or benefits, or a combination of them. The EPA 

submitted this action to OMB for review under Executive Orders 12866 and 13563 (76 FR 3821, 

January 21, 2011), and any changes made in response to OMB recommendations have been 

documented in the docket for this action. The EPA also prepared an analysis of the potential 

costs and benefits associated with this action in this Regulatory Impact Analysis (RIA). 

Consistent with EO 12866 and EO 13563, the EPA estimated the costs and benefits for 

illustrative compliance scenarios of implementing the proposed guidelines. This proposal sets 

goals to reduce CO2 emissions from the electric power industry. Actions taken to comply with 

the proposed guidelines will also reduce the emissions of directly emitted PM2.5, sulfur dioxide 

(SO2) and nitrogen oxides (NOX). The benefits associated with these PM, SO2 and NOX

reductions are referred to as co-benefits, as these reductions are not the primary objective of this 

rule. 

The EPA has used the U.S. government’s social cost of carbon (USG SCC) estimates (i.e., 

the monetary value of impacts associated with a marginal change in CO2 emissions in a given 

year), to analyze CO2 climate impacts of this rulemaking. The four USG SCC estimates are 

associated with different discount rates (model average at 2.5 percent discount rate, 3 percent, 

and 5 percent; 95th percentile at 3 percent), and each increases over time. In this summary, EPA 

provides the estimate of climate benefits associated with the SCC value deemed to be central by 

the USG (the model average at 3% discount rate). The EPA estimates that in 2020, the Option 1 

regional compliance approach will yield monetized climate benefits of approximately $17 

billion with a 3 percent model average (2011$). The air pollution health co-benefits in 2020 are 

estimated to be $16 billion to $37 billion for a 3 percent discount rate, and $15 billion to $34 

Comment [A86]: This section was updated to 

correspond to the preamble. 
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billion (2011$) for a 7 percent discount rate. The annual illustrative compliance costs estimated 

by IPM, inclusive of demand side energy efficiency program and participant costs and MRR 

costs, are approximately $5.5 billion (2011$) in 2020. The quantified net benefits (the difference 

between monetized benefits and costs) in 2020, are estimated to be $28 billion to $49 billion 

using a 3 percent discount rate (model average) and $26 to $45 billion using a 7 percent discount 

rate (model average, 2011$). For Option 1 state compliance approach, the climate benefits are 

estimated to be $18 billion (2011$). The air pollution health co-benefits in 2020 for the Option 1 

state compliance approach are estimated to be $17 billion to $40 billion for a 3 percent discount 

rate, and $15 billion to $36 billion (2011$) for a 7 percent discount rate. The annual illustrative 

compliance costs estimated by IPM, inclusive of demand side energy efficiency program and 

participant costs and MRR costs, are approximately $7.5 billion (2011$) in 2020. The quantified 

net benefits in 2020, are estimated to be $27 billion to $50 billion using a 3 percent discount rate 

(model average) and $26 to $46 billion using a 7 percent discount rate (model average, 2011$). 

For Option 1 regional compliance approach in 2030, the EPA estimates this proposal will 

yield monetized climate benefits of approximately $30 billion (3 percent, model average, 2011$). 

The air pollution health co-benefits in 2030 are estimated to be $25 billion to $59 billion for a 3 

percent discount rate, and $23 billion to $54 billion (2011$) for a 7 percent discount rate. The 

annual illustrative compliance costs estimated using IPM, inclusive of demand side energy 

efficiency program and participant costs and MRR costs, are approximately $7.3 billion (2011$) 

in 2030. The quantified net benefits (the difference between monetized benefits and costs) in 

2030, are estimated to be $48 billion to $82 billion using a 3 percent discount rate and $46 to $77 

billion assuming a 7% discount rate (model average, 2011$). For the Option 1 state compliance 

approach, net benefits in 2030 are estimated to be $49 to $84 billion (3 percent discount rate) and 

$46 to 79 billion (7 percent discount rate (2011$). Compliance costs are estimated to be $8.8 

billion (2011$). Based upon the foregoing discussion, it remains clear that the benefits of this 

proposal are substantial, and far exceed the costs. Additional benefit, cost and net benefit 

estimates for Option 1 and Option 2 are provided in Chapter 8 of this report. 

7.2 Paperwork Reduction Act 

The information collection requirements in this proposed rule have been submitted for 

approval to the Office of Management and Budget (OMB) under the Paperwork Reduction Act, 
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44 U.S.C. 3501 et seq. The Information Collection Request (ICR) document prepared by the 

EPA has been assigned the EPA ICR number [insert #]. 

The information collection requirements are based on the recordkeeping and reporting 

burden associated with developing, implementing, and enforcing a state plan to limit CO2

emissions from existing sources in the power sector. These recordkeeping and reporting 

requirements are specifically authorized by CAA section 114 (42 U.S.C. 7414). All information 

submitted to the EPA pursuant to the recordkeeping and reporting requirements for which a 

claim of confidentiality is made is safeguarded according to agency policies set forth in 40 CFR 

part 2, subpart B. 

The annual burden for this collection of information for the states (averaged over the first 3 

years following promulgation of this proposed action) is estimated to be a range of 315,554 

hours at a total annual labor cost of $22,334,119, to 632,338 hours at a total annual labor cost of 

$44,755,317. The lower bound estimate reflects the assumption that some states already have 

energy efficiency and renewable energy programs in place. The higher bound estimate reflects 

the assumption that no states have energy efficiency and renewable energy programs in place. 

The annual burden for this collection of information for the states (averaged over the first 3 years 

following promulgation of this proposed action) is estimated to be a range of 315,554 hours at a 

total annual labor cost of $22,334,119, to 632,338 hours at a total annual labor cost of 

$44,755,317. The lower bound estimate reflects the assumption that some states already have 

energy efficiency and renewable energy programs in place. The higher bound estimate reflects 

the assumption that no states have energy efficiency and renewable energy programs in place. 

The total annual burden for the federal government (averaged over the first 3 years following 

promulgation of this proposed action) is estimated to be 53,267 hours at a total annual labor cost 

of $2,958.005. Burden means the total time, effort, or financial resources expended by persons to 

generate, maintain, retain, or disclose or provide information to or for a Federal agency. This 

includes the time needed to review instructions; develop, acquire, install, and utilize technology 

and systems for the purposes of collecting, validating, and verifying information, processing and 

maintaining information, and disclosing and providing information; adjust the existing ways to 

comply with any previously applicable instructions and requirements; train personnel to be able 

to respond to a collection of information; search data sources; complete and review the collection 

of information; and transmit or otherwise disclose the information. 
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An agency may not conduct or sponsor, and a person is not required to respond to a 

collection of information unless it displays a currently valid OMB control number. The OMB 

control numbers for the EPA’s regulations are listed in 40 CFR part 9 and 48 CFR chapter 15. 

7.3 Regulatory Flexibility Act 

The Regulatory Flexibility Act (RFA) generally requires an agency to prepare a regulatory 

flexibility analysis of any rule, subject to notice and comment rulemaking requirements, under 

the Administrative Procedure Act or any other statute unless the agency certifies that the rule 

will not have a significant economic impact on a substantial number of small entities. Small 

entities include small businesses, small organizations, and small governmental jurisdictions. 

For purposes of assessing the impacts of this rule on small entities, small entity is defined 

as: 

1. A small business is defined by the SBA’s regulations at 13 CFR 121.201 (for the 

electric power generation industry, the small business size standard is an ultimate 

parent entity with less than 750 employees). The NAICS codes for the affected 

industry are in Table 14 below. 

2. A small governmental jurisdiction that is a government of a city, county, town, 

school district or special district with a population of less than 50,000. 

A small organization that is any not-for-profit enterprise that is independently 

owned and operated and is not dominant in its field. 

Table 7-1 Potentially Regulated Categories and Entitiesa 

Category NAICS Code Examples of Potentially Regulated 

Entities 

Industry 221112 Fossil fuel electric power generating 

units. 

State/Local Government 221112b Fossil fuel electric power generating 

units owned by municipalities. a

 Include NAICS categories for source categories that own and operate electric power generating units (includes 

boilers and stationary combined cycle combustion turbines). 

b

 State or local government-owned and operated establishments are classified according to the activity in which they 

are engaged. 
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After considering the economic impacts of this proposed rule on small entities, EPA 

certifies that this action will not have a significant economic impact on a substantial number of 

small entities. 

The proposed rule will not impose any requirements on small entities. Specifically, 

emission guidelines established under CAA section 111(d) do not impose any requirements on 

regulated entities and, thus, will not have a significant economic impact upon a substantial 

number of small entities. After emission guidelines are promulgated, states establish standards on 

existing sources and it is those state requirements that could potentially impact small 

entities. Our analysis here is consistent with the analysis of the analogous situation arising when 

the EPA establishes NAAQS, which do not impose any requirements on regulated entities. As 

here, any impact on small entities would only arise when states take subsequent action to 

maintain and/or achieve the NAAQS through their state implementation plans. See American 

Trucking Assoc. v. EPA, 175 F.3d 1029, 1043-45 (D.C. Cir. 1999) national standards for 

allowable concentrations of particulate matter in ambient air as required by section 109 of the 

CAA. See also American Trucking Associations v. EPA. 175 F.3d at 1044–45 (NAAQS do not 

have significant impacts upon small entities because NAAQS themselves impose no regulations 

upon small entities). 

Nevertheless, the EPA is aware that there is substantial interest in the proposed rule 

among small entities (municipal and rural electric cooperatives). As detailed in Section III.A.of 

the preamble, the EPA has conducted an unprecedented amount of stakeholder outreach on 

setting emission guidelines for existing EGUs. While formulating the provisions of the proposed 

rule, the EPA considered the input provided over the course of the stakeholder outreach. Section 

III.B. of the preamble describes the key messages from stakeholders. In addition, as described in 

the RFA section of the preamble to the proposed standards of performance for GHG emissions 

from new EGUs (79 FR 1499-1500, January 8, 2014), the EPA conducted outreach to 

representatives of small entities while formulating the provisions of the proposed standards. 

Although only new EGUs would be affected by those proposed standards, the outreach regarded 

planned actions for new and existing sources. We invite comments on all aspects of the proposal 

and its impacts, including potential impacts on small entities. 
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7.4 Unfunded Mandates Reform Act (UMRA) 

This proposed action does not contain a federal mandate that may result in expenditures of 

$100 million or more for State, local, and tribal governments, in the aggregate, or the private 

sector in any one year. Specifically, the emission guidelines proposed under CAA section 111(d) 

do not impose any direct compliance requirements on regulated entities, apart from the 

requirement for states to develop state plans. The burden for states to develop state plans in the 3 

year period following promulgation of the rule was estimated and is listed in Section IX B. of the 

preamble for the rulemaking, but this burden is estimated to be below $100 million in any one 

year. Thus, this proposed rule is not subject to the requirements of section 202 or section 205 of 

UMRA. 

This proposed rule is also not subject to the requirements of section 203 of UMRA because 

it contains no regulatory requirements that might significantly or uniquely affect small 

governments. 

In light of the interest among governmental entities, the EPA initiated consultations with 

governmental entities while formulating the provisions of the proposed standards for new EGUs. 

Although only new EGUs would be affected by those proposed standards, the outreach regarded 

planned actions for new and existing sources. As described in the UMRA discussion in the 

preamble to the proposed standards of performance for GHG emissions from new EGUs (79 FR 

1500-1501, January 8, 2014), the EPA consulted with the following 10 national organizations 

representing state and local elected officials: 

 National Governors Association 

 National Conference of State Legislatures 

 Council of State Governments 

 National League of Cities 

 U.S. Conference of Mayors 

 National Association of Counties 

 International City/County Management Association 

 National Association of Towns and Townships 

 County Executives of America 

 Environmental Council of States 
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On February 26, 2014, the EPA re-engaged with those governmental entities to provide a 

pre-proposal update on the emission guidelines for existing EGUs and emission standards for 

modified and reconstructed EGUs. 

While formulating the provisions of these proposed emission guidelines, the EPA also 

considered the input provided over the course of the extensive stakeholder outreach conducted 

by the EPA. 

7.5 Executive Order 13132, Federalism 

Under Executive Order 13132, EPA may not issue an action that has federalism 

implications, that imposes substantial direct compliance costs, and that is not required by statute, 

unless the Federal government provides the funds necessary to pay the direct compliance costs 

incurred by State and local governments, or the EPA consults with state and local officials early 

in the process of developing the proposed action. 

The EPA has concluded that this action may have federalism implications, because it may 

impose substantial direct compliance costs on state or local governments, and the federal 

government will not provide the funds necessary to pay those costs. As discussed in the 

Supporting Statement found in the docket for this rulemaking, the development of state plans 

will entail many hours of staff time to develop and coordinate programs for compliance with the 

proposed rule, as well as time to work with state legislatures as appropriate, and develop a plan 

submittal. 

The EPA consulted with state and local officials early in the process of developing the 

proposed action to permit them to have meaningful and timely input into its development. As 

described in the Federalism discussion in the preamble to the proposed standards of performance 

for GHG emissions from new EGUs (79 FR 1501, January 8, 2014), the EPA consulted with 

state and local officials in the process of developing the proposed standards for newly 

constructed EGUs. This outreach regarded planned actions for new, reconstructed, modified and 

existing sources. The EPA invited the following 10 national organizations representing state and 

local elected officials to a meeting on April 12, 2011, in Washington DC: (1) National Governors 

Association; (2) National Conference of State Legislatures, (3) Council of State Governments, 
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(4) National League of Cities, (5) U.S. Conference of Mayors, (6) National Association of 

Counties, (7) International City/County Management Association, (8) National Association of 

Towns and Townships, (9) County Executives of America, and (10) Environmental Council of 

States. These 10 organizations representing elected state and local officials have been identified 

by the EPA as the “Big 10” organizations appropriate to contact for purpose of consultation with 

elected officials. On February 26, 2014, the EPA re-engaged with those governmental entities to 

provide a pre-proposal update on the emission guidelines for existing EGUs and emission 

standards for modified and reconstructed EGUs. In addition, extensive stakeholder outreach 

conducted by the EPA allowed state leaders, including governors, environmental commissioners, 

energy officers, public utility commissioners, and air directors, opportunities to engage with EPA 

officials and provide input regarding reducing carbon pollution from power plants. 

A detailed Federalism Summary Impact Statement (FSIS) describing the most pressing 

issues raised in pre-proposal and post-proposal comments will be forthcoming with the final rule, 

as required by section 6(b) of Executive Order 13132. In the spirit of Executive Order 13132, 

and consistent with EPA policy to promote communications between EPA and State and local 

governments, EPA specifically solicits comment on this proposed action from State and local 

officials. 

7.6 Executive Order 13045, Protection of Children from Environmental 

 Health Risks and Safety 

The EPA interprets EO 13045 (62 FR 19885, April 23, 1997) as applying to those 

regulatory actions that concern health or safety risks, such that the analysis required under 

section 5-501 of the Order has the potential to influence the regulation. This action is not subject 

to EO 13045 because it does not involve decisions on environmental health or safety risks that 

may disproportionately affect children. The EPA believes that the CO2 emission reductions 

resulting from implementation of the proposed guidelines, as well as substantial ozone and PM2.5 

emission reductions as a co-benefit, would further improve children’s health. 
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7.7 Executive Order 13211, Actions Concerning Regulations that Significantly Affect 

 Energy Supply, Distribution, or Use 

Executive Order 13211 (66 FR 28355; May 22, 2001) requires the EPA to prepare and 

submit a Statement of Energy Effects to the Administrator of the Office of Information and 

Regulatory Affairs, OMB, for actions identified as ‘‘significant energy actions.’’ This action, 

which is a significant regulatory action under EO 12866, is likely to have a significant effect on 

the supply, distribution, or use of energy. We have prepared a Statement of Energy Effects for 

this action as follows. We estimate a 4 to 7 percent increase in retail electricity prices, on 

average, across the contiguous U.S. in 2020, and a 16 to 22 percent reduction in coal-fired 

electricity generation as a result of this rule. The EPA projects that electric power sector 

delivered natural gas prices will increase by about 8 to 12 percent in 2020 and reflect no change 

to a decrease of approximately 3 percent in 2030. Additional information is available in Chapter 

3 of this RIA.

7.8 National Technology Transfer and Advancement Act (NTTAA) 

Section 12(d) of the NTTAA of 1995 (Public Law No. 104-113; 15 U.S.C. 272 note) 

directs the EPA to use Voluntary Census Standards in their regulatory and procurement activities 

unless to do so would be inconsistent with applicable law or otherwise impractical. Voluntary 

consensus standards are technical standards (e.g., materials specifications, test methods, 

sampling procedures, business practices) developed or adopted by one or more voluntary 

consensus bodies. The NTTAA directs the EPA to provide Congress, through annual reports to 

the OMB, with explanations when an agency does not use available and applicable VCS. This 

proposed rulemaking does not involve technical standards. 

The EPA welcomes comments on this aspect of the proposed rulemaking and specifically 

invites the public to identify potentially-applicable VCS and to explain why such standards 

should be used in this action. 

7.8 Executive Order 12898: Federal Actions to Address Environmental Justice in 

 Minority Populations and Low-Income Populations 

Executive Order 12898 (59 FR 7629, February 16, 1994) establishes federal executive 

policy on environmental justice. Its main provision directs federal agencies, to the greatest extent 

practicable and permitted by law, to make environmental justice part of their mission by 
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identifying and addressing, as appropriate, disproportionately high and adverse human health or 

environmental effects of their programs, policies and activities on minority populations and lowincome populations in the U.S. 

Section II.A of the preamble summarizes the public health and welfare impacts from GHG 

emissions that were detailed in the 2009 Endangerment Finding under CAA section 202(a)(1).165

As part of the Endangerment Finding, the Administrator considered climate change risks to 

minority or low-income populations, finding that certain parts of the population may be 

especially vulnerable based on their circumstances. These include the poor, the elderly, the very 

young, those already in poor health, the disabled, those living alone, and/or indigenous 

populations dependent on one or a few resources. The Administrator placed weight on the fact 

that certain groups, including children, the elderly, and the poor, are most vulnerable to climaterelated health effects. 

Strong scientific evidence that the potential impacts of climate change raise environmental 

justice issues is found in the major assessment reports by the U.S. Global Change Research 

Program (USGCRP), the Intergovernmental Panel on Climate Change (IPCC), and the National 

Research Council (NRC) of the National Academies, summarized in the record for the 

Endangerment Finding. Their conclusions include that poor communities can be especially 

vulnerable to climate change impacts because they tend to have more limited adaptive capacities 

and are more dependent on climate-sensitive resources such as local water and food supplies. In 

addition, Native American tribal communities possess unique vulnerabilities to climate change, 

particularly those on established reservations that are restricted to reservation boundaries and 

therefore have limited relocation options. Tribal communities whose health, economic wellbeing, and cultural traditions depend upon the natural environment will likely be affected by the 

degradation of ecosystem goods and services associated with climate change. Southwest native 

cultures are especially vulnerable to water quality and availability impacts. Native Alaskan 

communities are likely to experience disruptive impacts, including shifts in the range or 

abundance of wild species crucial to their livelihoods and well-being. The most recent 

 

165 “Endangerment and Cause or Contribute Findings for Greenhouse Gases Under Section 

202(a) of the Clean Air Act,” 74 Fed. Reg. 66,496 (Dec. 15, 2009) (“Endangerment 

Finding”). 
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assessments continue to strengthen scientific understanding of climate change risks to minority 

and low-income populations. 

This proposed rule limits GHG emissions by establishing CO2 emission guidelines for 

existing fossil fuel-fired EGUs. In addition to reducing CO2 emissions, implementing the 

proposed rule would reduce other emissions from EGUs that are dispatched less under a state’s 

CAA section 111(d) program because of their relatively low energy efficiency. These emission 

reductions will include SO2 and NOx, which form ambient PM2.5 and ozone in the atmosphere, 

and hazardous air pollutants (HAP), such as mercury and hydrochloric acid. In the final rule 

revising the annual PM2.5 standard166, the EPA identified persons with lower socioeconomic 

status as an at-risk population for experiencing adverse health effects related to PM exposures. 

Persons with lower socioeconomic status have been generally found to have a higher prevalence 

of pre-existing diseases, limited access to medical treatment, and increased nutritional 

deficiencies, which can increase this population’s risk to PM-related and ozone-related effects.167

Therefore, in areas where this rulemaking reduces exposure to PM2.5, ozone, and methylmercury 

persons with low socioeconomic status would also benefit. The regulatory impact analysis (RIA) 

for this rulemaking, included in the docket for this rulemaking, provides additional information 

regarding the health and ecosystem effects associated with these emission reductions. 

While there will be many locations with improved air quality for PM2.5, ozone, and HAP, 

there may also be EGUs whose emissions of one or more of these pollutants or their precursors 

increase as a result of the proposed emission guidelines for existing fossil fuel-fired EGUs. This 

may occur at EGUs that are dispatched more intensively than in the past because they become 

more energy efficient. The EPA has considered the potential for such increases and the 

environmental justice implications of such increases. 

As we noted in the NSR discussion in this preamble, as part of a state’s CAA section 

111(d) plan, the state may require an affected EGU to undertake a physical or operational change 

to improve the unit’s efficiency that results in an increase in the unit’s dispatch and an increase 

 

166 U.S. EPA (2013). National Ambient Air Quality Standards for Particulate Matter, Final Rule. Federal Register

78 (15 January 2013): 3086-3287. 

167 U.S. Environmental Protection Agency (U.S. EPA). 2009. Integrated Science Assessment for Particulate Matter 

(Final Report). EPA-600-R-08-139F. National Center for Environmental Assessment – RTP Division. 

December. Available on the Internet at <http://cfpub.epa.gov/ncea/cfm/recordisplay.cfm?deid=216546>.
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in the unit’s annual emissions of GHGs and/or other regulated pollutants. As we noted in the 

NSR discussion in this preamble, a state can take steps to avoid increased utilization of particular 

EGUs and thus to avoid any significant increases in emissions including emissions of other 

regulated pollutants whose environmental effects would be more localized around the affected 

EGU. To the extent that states take this path, there would be no new environmental justice 

concerns in the areas near such EGUs. For any EGUs that make modifications that do trigger 

NSR permitting, the applicable local, state, or federal permitting program will ensure that there 

are no new NAAQS violations and that no existing NAAQS violations are made worse. For 

those EGUs in a permitting situation for which the EPA is the permit reviewing authority, the 

EPA will consider environmental justice issues as required by Executive Order 12898. 

In addition to some EGUs possibly being required by a state to make modifications for 

increased energy efficiency, another effect of the proposed CO2 emission guidelines for existing 

fossil fuel-fired EGUs would be increased utilization of other, unmodified EGUs with relatively 

low GHG emissions per unit of electrical output, in particular high efficiency gas-fired EGUs. 

Because such EGUs would not have been modified physically nor changed their method of 

operation, they would not be subject to review in the NSR permitting program. Such plants 

would have more hours in the year in which they operate and emit pollutants, including 

pollutants whose environmental effects if any would be localized rather than global as is the case 

with GHG emissions. Changes in utilization already occur now as demands for and sources of 

electrical energy evolve, but the proposed CO2 emission guidelines for existing fossil fuel-fired 

EGUs can be expected to cause more such changes. Because gas-fired EGUs emit essentially no 

mercury, increased utilization would not increase methylmercury concentrations in their 

vicinities. Increased utilization generally would not cause higher peak concentrations of PM2.5, 

NOx, or ozone around such EGUs than is already occurring because peak hourly or daily 

emissions generally would not change, but increased utilization may make periods of relatively 

high concentrations more frequent. It should be noted that the gas-fired sources that are likely to 

be dispatched more frequently than at present have very low emissions of primary particulate 

matter, SO2 and hazardous air pollutants per unit of electrical output, such that local (or regional) 

air quality for these pollutants is likely to be affected very little. For natural gas-fired EGUS, the 

EPA found that regulation of HAP emissions “is not appropriate or necessary because the 

impacts due to HAP emissions from such units are negligible based on the results of the study 
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documented in the utility RTC” 65 FR 79831. In studies done by DOE/NETL comparing cost 

and performance of coal- and NG-fired generation, they assumed SO2, PM (and Hg) emissions to 

be “negligible.” Their studies predict NOx emissions from a NGCC unit to be approximately 10 

times lower than a subcritical or supercritical coal-fired boiler. Many are also very well 

controlled for emission of NOx through the application of after combustion controls such as 

selective catalytic reduction, although not all gas-fired sources are so equipped. Depending on 

the specificity of the state CAA section 111(d) plan, the state may be able to predict which EGUs 

and communities may be in this type of situation and to address any concerns about localized 

NO2 concentrations in the design of the CAA section 111(d) program, or separately from the 

CAA section 111(d) program but before its implementation. In any case, existing tracking 

systems will allow states and the EPA to be aware of the EGUs whose utilization has increased 

most significantly, and thus to be able to prioritize our efforts to assess whether air quality has 

changed in the communities in the vicinity of such EGUs. There are multiple mechanisms in the 

CAA to address situations in which air quality has degraded significantly. In conclusion, this 

proposed rule will result in regional and national pollutant reductions; however, there likely will 

also be some locations with more times during the year of relatively higher concentrations of 

pollutants with potential for effects on localized communities than would be experienced in the 

absence of the proposed rule. The EPA cannot exactly predict how emissions from specific 

EGUs would change as an outcome of the proposed rule due to the state-led implementation. 

Therefore, the EPA has concluded that it is not practicable to determine whether there would be 

disproportionately high and adverse human health or environmental effects on minority, low 

income, or indigenous populations from this proposed rule. 

In order to provide opportunities for meaningful involvement early on in the rule making 

process, the EPA has hosted webinars and conference calls on August 27, 2013 and September 9, 

2013 on the proposed rule specifically for environmental justice communities and has taken all 

comments and suggestions into consideration in the design of the emission guidelines. 

7.10 Executive Order 13175 - Consultation and Coordination with Indian Tribal 

 Governments 

This action does not have tribal implications, as specified in Executive Order 13175 (65 

FR 67249, November 9, 2000). It would not impose substantial direct compliance costs on tribal 

governments that have affected EGUs located in their area of Indian country. Tribes are not 
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required to, but may, develop or adopt CAA programs. Tribes are not required to develop plans 

to implement the guidelines under CAA section 111(d) for affected EGUs. To the extent that a 

tribal government seeks and attains treatment in a manner similar to a state (TAS) status for that 

purpose and is delegated authority for air quality planning purposes, these proposed emission 

guidelines would require that planning requirements be met and emission management 

implementation plans be executed by the tribes. The EPA is aware of three coal-fired EGUs and 

one natural gas-fired EGU located in Indian country but is not aware of any affected EGUs that 

are owned or operated by tribal entities. The EPA notes that this proposal does not directly 

impose specific requirements on EGU sources, including those located in Indian country, such as 

the three coal-fired EGUs and one natural gas-fired EGU, but provides guidance to any tribe with 

delegated authority to address CO2 emissions from EGU sources found subject to section 111(d) 

of the CAA. Thus, Executive Order 13175 does not apply to this action. 

The EPA conducted outreach to tribal environmental staff and offered consultation with 

tribal officials in developing this action. Because the EPA is aware of tribal interest in this 

proposed rule, prior to the April 13, 2012 proposal (77 FR 22392-22441), the EPA offered 

consultation with tribal officials early in the process of developing the proposed regulation to 

permit them to have meaningful and timely input into its development. The EPA's consultation 

regarded planned actions for new and existing sources. In addition, on April 15, 2014, prior to 

proposal, the EPA met with Navajo Energy Development Group officials. For this proposed 

action for existing EGUs, a tribe that has one or more affected EGUs located in its area of Indian 

Country168 would have the opportunity, but not the obligation, to establish a CO2 performance 

standard and a CAA section 111(d) plan for its area of Indian country. 

Consultation letters were sent to 584 tribal leaders. The letters provided information 

regarding the EPA's development of both the NSPS and emission guidelines for fossil fuel-fired 

EGUs and offered consultation. No tribes have requested consultation. Tribes were invited to 

participate in the national informational webinar held August 27, 2013. In addition, 

 

168 The EPA is aware of at least four affected EGUs located in Indian country: two on Navajo lands, the Navajo 

Generating Station and the Four Corners Generating Station; one on Ute lands, the Bonanza Generating Station; 

and one on Fort Mojave lands, the South Point Energy Center. The affected EGUs at the first three plants are 

coal-fired EGUs. The fourth affected EGU is an NGCC facility.
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consultation/outreach meeting was held on September 9, 2013, with tribal representatives from 

some of the 584 tribes. The EPA also met with tribal environmental staff via National Tribal Air 

Association teleconferences on July 25, 2013, and December 19, 2013. In those teleconferences, 

the EPA provided background information on the GHG emission guidelines to be developed and 

a summary of issues being explored by the agency. Tribes have expressed varied points of view. 

Some tribes raised concerns about the impacts of the regulations on EGUs and the subsequent 

impact on jobs and revenue for their tribes. Other tribes expressed concern about the impact the 

regulations would have on the cost of water to their communities as a result of increased costs to 

the EGU that provide energy to transport the water to the tribes. Other tribes raised concerns 

about the impacts of climate change on their communities, resources, life ways and hunting and 

treaty rights. The tribes were also interested in the scope of the guidelines being considered by 

the agency (e.g., over what time period, relationship to state and multi-state plans) and how 

tribes will participate in these planning activities. In addition, the EPA held a series of listening 

sessions prior to development of this proposed action. In 2013, tribes participated in a session 

with the state agencies, as well as a separate session with tribes. 

During the public comment period for this proposal, the EPA will hold meetings with tribal 

environmental staff to inform them of the content of this proposal, as well as offer further 

consultation with tribal elected officials where it is appropriate. We specifically solicit comment 

from tribal officials on this proposed rule. 
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CHAPTER 8: COMPARISON OF BENEFITS AND COSTS 

8.1 Comparison of Benefits and Costs 

 The illustrative benefits, costs, and net benefits of compliance with Options 1 and 2 are 

presented in this chapter of the Regulatory Impact Analysis (RIA). As discussed in Chapter 3, 

the EPA is proposing two options for state-specific rate-based CO2 goals that reflect application 

of cost-effective measures from all four building blocks discussed. Options 1 and 2, presented in 

this RIA, reflect possible compliance approaches with state-specific CO2 goals. These Options 

are a reflection of what compliance could look like for Options 1 and 2, assuming states comply 

with the CO2 goals on an individual state basis (referred to as state approach) or a number of 

states comply collectively on a regional basis (referred to as regional approach). EPA is 

proposing Option 1 and taking comment on Option 2. The guidelines allow flexibility of 

compliance, and EPA recognizes that actual compliance may differ from the illustrative 

approaches reflected in this RIA. 

 The EPA has used the social cost of carbon estimates presented in the 2013 Technical 

Support Document: Technical Update of the Social Cost of Carbon for Regulatory Impact 

Analysis Under Executive Order 12866 (2013 SCC TSD) to analyze CO2 climate impacts of this 

rulemaking.169 We refer to these estimates, which were developed by the U.S. government, as 

“SCC estimates.” The SCC is an estimate of the monetary value of impacts associated with a 

marginal change in CO2 emissions in a given year). The four SCC estimates are associated with 

different discount rates (model average at 2.5 percent discount rate, 3 percent, and 5 percent; 95th

percentile at 3 percent), and each increases over time. In this comparison of benefits and costs, 

the EPA provides the estimate of climate benefits associated with the SCC value deemed to be 

central in the SCC TSD (the model average at 3% discount rate). As Table 8-1 shows, the EPA 

 

169 Docket ID EPA-HQ-OAR-2013-0495, Technical Support Document: Technical Update of the Social Cost of 

Carbon for Regulatory Impact Analysis Under Executive Order 12866, Interagency Working Group on Social 

Cost of Carbon, with participation by Council of Economic Advisers, Council on Environmental Quality, 

Department of Agriculture, Department of Commerce, Department of Energy, Department of Transportation, 

Environmental Protection Agency, National Economic Council, Office of Energy and Climate Change, Office of 

Management and Budget, Office of Science and Technology Policy, and Department of Treasury (May 2013, 

Revised November 2013). Available at: 

http://www.whitehouse.gov/sites/default/files/omb/assets/inforeg/technical-update-social-cost-of-carbon-forregulator-impact-analysis.pdf.

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estimates that under the proposed Option 1, regional approach monetized climate benefits (in 

2011$) are $17 billion in 2020, assuming a 3 percent discount rate (model average). The air 

pollution health co-benefits in 2020 are estimated to be $16 billion to $37 billion for a 3 percent 

discount rate and $15 billion to $34 billion (2011$) for a 7 percent discount rate. The annual, 

illustrative compliance costs estimated by IPM and inclusive of demand side energy efficiency 

program and participant costs and Monitoring Reporting and Recordkeeping (MRR) costs, are 

approximately $5.5 billion (2011$) in 2020. The quantified net benefits (the difference between 

monetized benefits and costs) in 2020, are $28 billion to $49 billion using a 3 percent discount 

rate and $26 billion to $45 billion assuming a 7 percent discount rate (2011$). In comparison, net 

benefits for the Option 1 state compliance approach in 2020 are estimated to be $27 billion to 

$50 billion, using a 3 percent discount rate and $26 billion to $46 billion assuming a 7 percent 

discount rate. Option 2 regional and state compliance approach benefits, costs and net benefits 

for 2020 are also shown on Table 8-1. Table 8-2 reflects estimates for the Options 1 and 2 

regional and state compliance approaches for 2025. For the regional compliance approach to the 

proposal Option 1 in 2030, the EPA estimates this proposal will yield monetized climate benefits 

of $30 billion (2011$) (using 3 percent discount rate (model average) as shown on Table 8-3. 

The air pollution health co-benefits in 2030 are estimated to be $254 billion to $59 billion for a 3 

percent discount rate and $23 billion to $54 billion (2011$) for a 7 percent discount rate. The 

annual illustrative compliance costs estimated using IPM, inclusive of demand side energy 

efficiency program and participant costs and MRR costs, are approximately $7.3 billion (2011$) 

in 2030. The quantified net benefits for the Option 1 regional in 2030 are $48 billion to $82 

billion, assuming a 3 percent discount rate, and $46 to $77 billion assuming a 7 percent discount 

rate (2011$). In 2030, quantified net benefits are $49 billion to $84 billion, assuming a 3 percent 

discount rate, and $46 to $79 billion assuming a 7 percent discount rate (2011$) for the Option 1 

state compliance approach. This table also reflects benefit, cost, and net benefit estimates in 2030 

for Option 2 regional and state compliance approaches. 

 Based upon the foregoing discussion, it remains clear that the benefits of this proposal are 

substantial and far outweigh the costs for the all regulatory options and compliance approaches. 

The EPA could not monetize important categories of impacts. Unquantified impacts include 

those associated with changes in emissions of other pollutants that affect the climate, such as 

methane. In addition, the analysis does not quantify co-benefits from reducing exposure to SO2, 

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NOx, and hazardous air pollutants (e.g., mercury and hydrogen chloride), as well as ecosystem 

effects and visibility impairment.
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Table 8-1. Summary of Monetized Benefits, Compliance Costs, and Net Benefits for the 

Proposed Guidelines – 2020 (billions of 2011$) a

Option 1 - state Option 2 – state 

3% Discount 

Rate 

7% Discount 

Rate

3% Discount 

Rate

7% Discount 

Rate

Climate Benefits b 

5% discount rate 

3% discount rate 

2.5% discount rate 

95th percentile at 3% discount rate 

$4.9 

$18 

$26 

$52 

$3.8 

$14 

$20 

$40 

Air pollution health co-benefits c $17 to $40 $15 to $36 $14 to $32 $12 to $29

Total Compliance Costs d $7.5 $5.5 

Net Benefits e $27 to $50 $26 to $46 $22 to $40 $20 to $37

Non-Monetized Benefits 

Direct exposure to SO2 and NO2

1.5 tons of Hg 

Ecosystem Effects 

Visibility impairment 

Direct exposure to SO2 and NO2

1.2 tons of Hg 

Ecosystem Effects 

Visibility impairment 

Option 1 – regional Option 2 – regional 

3% Discount 

Rate 

7% Discount 

Rate 

3% Discount 

Rate 

7% Discount 

Rate 

Climate Benefits b

5% discount rate 

3% discount rate 

2.5% discount rate 

95th percentile at 3% discount rate 

$4.7 

$17 

$25 

$51 

$3.6 

$13 

$19 

$39 

Air pollution health co-benefits c $16 to $37 $15 to $34 $13 to $31 $12 to $28

Total Compliance Costs d $5.5 $4.3 

Net Benefits e $28 to $49 $26 to $45 $22 to $40 $21 to $37

Non-Monetized Benefits 

Direct exposure to SO2 and NO2

1.3 tons of Hg 

Ecosystem Effects 

Visibility impairment 

Direct exposure to SO2 and NO2

0.9 tons of Hg 

Ecosystem Effects 

Visibility impairment a All estimates are for 2020, and are rounded to two significant figures, so figures may not sum. 

b The climate benefit estimates in this summary table reflect global impacts from CO2 emission changes and do not 

account for changes in non-CO2 GHG emissions. Different discount rates are applied to SCC than to the other 

estimates because CO2 emissions are long-lived and subsequent damages occur over many years. The SCC 

estimates are year-specific and increase over time. 

c The air pollution health co-benefits reflect reduced exposure to PM2.5 and ozone associated with emission 

reductions of directly emitted PM2.5, SO2 and NOX. The range reflects the use of concentration-response 

functions from different epidemiology studies. The reduction in premature fatalities each year accounts for over 

90 percent of total monetized co-benefits from PM2.5 and ozone. These models assume that all fine particles, 

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regardless of their chemical composition, are equally potent in causing premature mortality because the scientific 

evidence is not yet sufficient to allow differentiation of effect estimates by particle type. 

d Total costs are approximated by the illustrative compliance costs estimated, using the Integrated Planning Model 

for the proposed option and a discount rate of approximately 5%. This estimate includes monitoring, 

recordkeeping, and reporting costs and demand side energy efficiency program and participant costs. 

e The estimates of net benefits in this summary table are calculated using the global social cost of carbon at a 3 

percent discount rate (model average). The RIA includes combined climate and health estimates based on these 

additional discount rates.

Table 8-2. Summary of Monetized Benefits, Compliance Costs, and Net Benefits for the 

Proposed Guidelines – 2025 (billions of 2011$) a

Option 1 – state Option 2 – state 

3% Discount 

Rate 

7% Discount 

Rate 

3% Discount 

Rate 

7% Discount 

Rate 

Climate Benefits b 

5% discount rate 

3% discount rate 

2.5% discount rate 

95th percentile at 3% discount rate 

$7.6 

$25 

$37 

$77 

$5.6 

$19 

$28 

$27 

Air pollution health co-benefits c $23 to $54 $21 to $49 $18 to $41 $16 to $37

Total Compliance Costs d $5.5 $5.5 

Net Benefits e $43 to $74 $41 to $69 $31 to $55 $29 to $51

Non-Monetized Benefits 

Direct exposure to SO2 and NO2

2.0 tons of Hg 

Ecosystem Effects 

Visibility impairment 

Direct exposure to SO2 and NO2

1.7 tons of Hg 

Ecosystem Effects 

Visibility impairment 

Option 1 – regional Option 2 – regional 

3% Discount 

Rate 

7% Discount 

Rate

3% Discount 

Rate

7% Discount 

Rate

Climate Benefits b

5% discount rate 

3% discount rate 

2.5% discount rate 

95th percentile at 3% discount rate 

$7.5 

$25 

$37 

$76 

$5.5 

$18 

$27 

$56 

Air pollution health co-benefits c $23 to $53 $21 to $48 $17 to $40 $16 to $36

Total Compliance Costs d $4.6 $4.5 

Net Benefits e $43 to $74 $41 to $69 $31 to $54 $29 to $50

Non-Monetized Benefits 

Direct exposure to SO2 and NO2

1.7 tons of Hg 

Ecosystem Effects 

Visibility impairment 

Direct exposure to SO2 and NO2

1.3 tons of Hg 

Ecosystem Effects 

Visibility impairment a All estimates are 2025, and are rounded to two significant figures, so figures may not sum. 

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particles are not yet available.

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b The climate benefit estimates in this summary table reflect global impacts from CO2 emission changes and do not 

account for changes in non-CO2 GHG emissions. Different discount rates are applied to SCC than to the other 

estimates because CO2 emissions are long-lived and subsequent damages occur over many years. The SCC 

estimates are year-specific and increase over time. 

c The air pollution health co-benefits reflect reduced exposure to PM2.5 and ozone associated with emission 

reductions of directly emitted PM2.5, SO2 and NOX. The range reflects the use of concentration-response 

functions from different epidemiology studies. The reduction in premature fatalities each year accounts for over 

90 percent of total monetized co-benefits from PM2.5 and ozone. These models assume that all fine particles, 

regardless of their chemical composition, are equally potent in causing premature mortality because the scientific 

evidence is not yet sufficient to allow differentiation of effect estimates by particle type. 

d Total costs are approximated by the illustrative compliance costs estimated, using the Integrated Planning Model 

for the proposed option and a discount rate of approximately 5%. This estimate includes monitoring, 

recordkeeping, and reporting costs and demand side energy efficiency program and participant costs. 

e The estimates of net benefits in this summary table are calculated using the global social cost of carbon at a 3 

percent discount rate (model average). The RIA includes combined climate and health estimates based on these 

additional discount rates. 

Table 8-3. Summary of Monetized Benefits, Compliance Costs, and Net Benefits for the 

Proposed Guidelines –2030 (billions of 2011$) a

Option 1– state Option 2– state 

3% Discount 

Rate 

7% Discount 

Rate 

3% Discount 

Rate 

7% Discount 

Rate 

Climate Benefits b 

5% discount rate 

3% discount rate 

2.5% discount rate 

95th percentile at 3% discount rate 

$9.5 

$31 

$44 

$94 

$6.4 

$21 

$30 

$63 

Air pollution health co-benefits c $27 to $62 $24 to $56 $18 to $42 $16 to $38

Total Compliance Costs d $8.8 $3.1 

Net Benefits e $49 to $84 $46 to $79 $36 to $59 $34 to $56

Non-Monetized Benefits 

Direct exposure to SO2 and NO2

2.1 tons of Hg and 590 tons of HCl 

Ecosystem Effects 

Visibility impairment 

Direct exposure to SO2 and NO2

1.5 tons of Hg and 130 tons of HCl 

Ecosystem Effects 

Visibility impairment 

Option 1– regional Option 2– regional 

3% Discount 

Rate 

7% Discount 

Rate

3% Discount 

Rate

7% Discount 

Rate

Climate Benefits b

5% discount rate 

3% discount rate 

2.5% discount rate 

95th percentile at 3% discount rate 

$9.3 

$30 

$44 

$92 

$6.0 

$20 

$28 

$60 

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Total Compliance Costs d $7.3 $1.9 

Net Benefits e $48 to $82 $46 to $77 $35 to $57 $33 to $54

Non-Monetized Benefits 

Direct exposure to SO2 and NO2

1.7 tons of Hg and 580 tons of HCl 

Ecosystem Effects 

Visibility impairment 

Direct exposure to SO2 and NO2

1.1 tons of Hg and 30 tons of HCl 

Ecosystem Effects 

Visibility impairment a All estimates are 2030, and are rounded to two significant figures, so figures may not sum. 

b The climate benefit estimates in this summary table reflect global impacts from CO2 emission changes and do not 

account for changes in non-CO2 GHG emissions. Also, different discount rates are applied to SCC than to the 

other estimates because CO2 emissions are long-lived and subsequent damages occur over many years. The SCC 

estimates are year-specific and increase over time. 

c The air pollution health co-benefits reflect reduced exposure to PM2.5 and ozone associated with emission 

reductions of directly emitted PM2.5, SO2 and NOX. The range reflects the use of concentration-response 

functions from different epidemiology studies. The reduction in premature fatalities each year accounts for over 

90 percent of total monetized co-benefits from PM2.5 and ozone. These models assume that all fine particles, 

regardless of their chemical composition, are equally potent in causing premature mortality because the scientific 

evidence is not yet sufficient to allow differentiation of effect estimates by particle type. 

d

 Total costs are approximated by the illustrative compliance costs estimated using the Integrated Planning Model 

for the proposed option and a discount rate of approximately 5%. This estimate includes monitoring, 

recordkeeping, and reporting costs and demand side energy efficiency program and participant costs. 

e The estimates of net benefits in this summary table are calculated using the global social cost 

of carbon at a 3 percent discount rate (model average). The RIA includes combined climate and 

health estimates based on these additional discount rates. 

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CHAPTER 9: BENEFITS, COSTS, AND ECONOMIC IMPACTS OF STANDARDS OF 

PERFORMANCE FOR RECONSTRUCTED AND MODIFIED ELECTRIC UTILITY 

GENERATING UNITS

9.1 Introduction 

The U.S. Environmental Protection Agency (EPA) is proposing emission limits for carbon 

dioxide (CO2) emitted from reconstructed and modified electric utility generating units (EGUs) 

under section 111(b) of the Clean Air Act (CAA). This chapter presents the proposed standards 

of performance for reconstructed and modified EGUs, as well as the expected economic impacts 

of the proposed standards. Based on historical information that has been reported to the EPA, the 

EPA anticipates few covered units will trigger the reconstruction or modification provisions in 

the period of analysis (through 2025). As a result, we do not anticipate any significant costs or 

benefits associated with this proposal. However, because there have been a few units that have 

notified EPA of modifications in the past, in this chapter we present an illustrative analysis of the 

costs and benefits for a hypothetical unit if it were to trigger the modification provision. We also 

discuss how the costs and benefits for compliance with the proposed standards may vary as a 

result of interactions with the CAA 111(d) emission guidelines for existing sources. This chapter 

also presents the relevant executive order and statutory requirements related to this proposal. 

9.2 Legal Basis for this Rulemaking 

Section 111 of the CAA requires performance standards for air pollutant emissions from 

categories of stationary sources that may reasonably contribute to the endangerment of public 

health or welfare. In April 2007, the Supreme Court ruled in Massachusetts v. EPA that 

greenhouse gases (GHGs) meet the definition of an “air pollutant” under the CAA. This ruling 

clarified that the authorities and requirements of the CAA apply to GHGs. The EPA issued a 

final determination that GHG emissions endanger both the public health and the public welfare 

of current and future generations in the Endangerment and Cause or Contribute Findings for 

Greenhouse Gases Under Section 202(a) of the CAA (74 FR 66,496; Dec. 15, 2009). 

On September 20, 2013, the EPA announced its first steps under President Obama’s 

Climate Action Plan to reduce CO2 emissions from power plants by proposing standards for 

newly constructed power plants built in the future (79 FR 1430, January 8, 2014). Specifically, 

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under the authority of CAA section 111(b), the EPA proposed standards for emissions of CO2

from newly constructed utility boilers and integrated gasification combined cycle (IGCC) units, 

and for natural gas-fired stationary combustion turbines. This action proposes standards to 

address CO2 emissions from reconstructed and modified power plants under the authority of 

CAA section 111(b). 

9.3 Background for the Proposed EGU Reconstructed and Modified Source GHG 

Standards 

9.3.1 Definition of Affected Sources 

This action proposes emission limits for EGUs that undergo reconstruction or 

modification. This rulemaking does not address GHG emissions from newly constructed sources 

or existing sources that do not undertake reconstruction or modification. (Analysis of the impact 

of emission guidelines for existing sources is presented in the preceding chapters.) The EPA is 

proposing that an existing unit that becomes subject to requirements under section 111(d) will 

continue to be subject to those requirements even after it becomes a modified or reconstructed 

source. Under this interpretation, the modified or reconstructed source would be subject to both 

the section 111(d) requirements that it had previously been subject to and the modified or 

reconstructed source standard under 111(b) that it became subject to as a modified or 

reconstructed source. 

9.3.1.1 Reconstructed Sources 

Under the EPA’s CAA section 111 standards of performance for new stationary sources, 

reconstructed sources are defined, in general, as existing sources that replace components to such 

an extent that the capital costs of the new components exceed 50 percent of the capital costs of 

an entirely new facility, and for which compliance with standards of performance for newly 

constructed sources is technologically and economically feasible. As described in the preamble, 

determinations regarding reconstructed status are made on a case-by-case basis, based on 

information submitted regarding the planned project. 

9.3.1.2 Modified Sources 

A modification is any physical or operational change to a source that increases the source’s 

maximum achievable hourly rate of emissions (i.e., lbs/MWh). The EPA, through regulations, 
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has determined that certain types of changes (such as pollution control projects) are exempt from 

consideration as a modification (40 CFR 60.2, 60.14(e)). 

9.3.2 Emission Limits 

This action proposes standards of performance for reconstructed utility boilers and IGCC 

units based on current best-performing generating technology (e.g., use of the highest 

demonstrated steam temperatures and pressures) as the best system of emission reductions 

(BSER). This action also proposes standards of performance for reconstructed natural gas-fired 

stationary combustion turbines based on modern, efficient natural gas combined cycle (NGCC) 

technology as the BSER. The proposed emission limits are calculated on a 12-month rolling 

average basis. The proposed emission limits for these units are shown in table 9-1. All existing 

sources that reconstruct after becoming subject to an approved CAA 111(d) state plan will 

remain in the plan and remain subject to regulatory requirements in the plan in addition to its 

regulatory requirements as a reconstructed unit. 

Table 9-27. Proposed Emission Limits - Reconstructions 

Subcategory Emission Limit 

Reconstructed Utility Boilers and IGCC Units (heat input rating > 2,000 MMBtu/h) 

1,900 lb CO2/MWhnet 

Reconstructed Utility Boilers and IGCC Units (heat input rating <= 2,000 MMBtu/h) 

2,100 lb CO2/MWhnet 

Reconstructed Natural Gas-Fired Stationary Combustion Turbines (heat input rating > 850 

MMBtu/h) 

1,000 lb CO2/MWhgross 

Reconstructed Natural Gas-Fired Stationary Combustion Turbines (heat input rating <= 

850 MMBtu/h) 

1,100 lb CO2/MWhgross 

This action proposes that modified utility boilers and IGCC units must meet one of two 

alternative requirements, depending on the timing of the modification.170 Sources that modify 

prior to becoming subject to an approved section 111(d) state plan would be required to meet a 

unit-specific numerical emission standard that is based on the source’s best demonstrated 

historical performance. Specifically, a modified utility boiler or IGCC unit would be required to 

maintain an emission rate that is two percent less than the unit’s best demonstrated annual 

performance during the years from 2002 to the year the modification occurs (or the emission 

limitation applicable to a corresponding reconstructed source, whichever is less stringent). The 

 

170 Units triggering both the modification and reconstruction provisions would be subject to the reconstructed source 

standards. 
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EPA has determined that this standard can be met through a combination of best operating 

practices and equipment upgrades. In co-proposed alternative #2, existing utility boilers and 

IGCC units that modify after becoming subject to requirements under an approved 111(d) plan 

would be required to meet a unit-specific emission limitation that is determined from a third 

party assessment to identify energy efficiency improvement opportunities for the affected 

source.171 All existing sources that are subject to requirements under an approved section 111(d) 

plan would remain subject to those requirements after modifying. 

For affected modified natural gas-fired stationary combustion turbines not subject to a 

111(d) plan, this action proposes standards of performance based on efficient NGCC technology 

as the BSER. The EPA is also proposing that affected stationary combustion turbines that are 

subject to an approved section 111(d) plan must remain in the plan. The proposed emission limits 

for modified sources (for co-proposed alternative #2) are shown in Table 9-2. 

Table 9-28. Proposed Emission Limits - Modifications 

 Subcategory Emission Limit 

Not Subject to State 

CAA 111(d) Plan 

Modified Utility Boilers and IGCC Units 

(heat input rating > 2,000 MMBtu/h) 

2% less than unit’s best demonstrated 

annual performance 

NO LOWER THAN 

1,900 lb CO2/MWh-net 

Modified Utility Boilers and IGCC Units 

(heat input rating <= 2,000 MMBtu/h) 

2% less than unit’s best demonstrated 

annual performance 

NO LOWER THAN 

2,100 lb CO2/MWh-net 

Modified Natural Gas-Fired Stationary 

Combustion Turbines (heat input rating > 850 

MMBtu/h) 

1,000 lb CO2/MWh-gross 

Modified Natural Gas-Fired Stationary 

Combustion Turbines (heat input rating <= 

850 MMBtu/h ) 

1,100 lb CO2/MWh-gross 

After Becoming 

Subject to State CAA 

111(d) Plan 

Modified Utility Boilers and IGCC Units 

Unit-specific emission limit determined by 

the expected performance after 

implementation of identified energy 

efficiency improvement opportunities 

AND 

111(d) requirements 

 

171 In co-proposed alternative #1, units would be required to meet the same 111(b) standard both before and after 

participation in a state 111(d) program. 
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Modified Natural Gas-Fired Stationary 

Combustion Turbines (heat input rating > 850 

MMBtu/h) 

1,000 lb CO2/MWh-gross 

AND 

111(d) requirements 

Modified Natural Gas-Fired Stationary 

Combustion Turbines (heat input rating <= 

850 MMBtu/h ) 

1,100 lb CO2/MWh-gross 

AND 

111(d) requirements 

Note: The proposed emission limits are calculated on a 12-month rolling average basis. 

9.4 Impacts of the Proposed Reconstructed and Modified Source Standards 

9.4.1 Reconstructed Sources 

Historically, we are only aware of one EGU that has notified the EPA that it has 

reconstructed under the reconstruction provision of section 111(b). As a result, we anticipate that 

few EGUs will undertake reconstruction through 2025. For this reason, the proposed standards 

will not result in any significant emission reductions, costs, or quantified benefits in the period of 

analysis. Likewise, the Agency does not anticipate any impacts on the price of electricity or 

energy supply. The proposed rule is not expected to raise any resource adequacy concerns, since 

reserve margins will not be impacted and the rule does not impose any additional requirements 

on existing facilities not triggering the reconstruction provision. There are no macroeconomic or 

employment impacts expected as a result of these proposed standards. 

Due to the extremely limited data available on reconstructions, it is not possible to conduct 

a representative illustrative analysis of what costs and benefits might result from this proposal in 

the unlikely case that a unit were to reconstruct. 

9.4.2 Modified Sources 

Historically, few EGUs have notified the EPA that they have modified under the 

modification provision of section 111(b). The EPA’s current regulations define an NSPS 

“modification” as a physical or operational change that increases the source’s maximum 

achievable hourly rate of emissions, but specifically exempt from that definition projects that 

entail the installation of pollution control equipment or systems. The EPA expects that most of 

the actions EGUs are likely to take in the foreseeable future that would be classified as 

“modifications” would qualify as pollution control projects. In many cases, those projects would 

involve the installation of add-on control equipment needed to meet CAA requirements for 

criteria and air toxics air pollutants. Any associated CO2 emissions increases would generally be 

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small and would occur as a chemical byproduct of the operation of the control equipment. In 

other cases, those projects would involve equipment changes to improve fuel efficiency to meet 

state requirements for implementation of the future CAA section 111(d) rulemaking for existing 

sources and would have the effect of increasing a source’s maximum achievable hourly emission 

rate (lb CO2/hr), even while decreasing its actual output based emission rate (lb CO2/MWh). 

Because all of these actions would be treated as pollution control projects under the EPA’s 

current NSPS regulations, they would be specifically exempted from the definition of 

modification. 

Based on this information, we anticipate that few EGUs will take actions that would be 

considered modifications during the period of analysis. For this reason, the proposed standards 

will result in minimal emission reductions, costs, or quantified benefits by 2025. Likewise, the 

Agency does not anticipate any impacts on the price of electricity or energy supplies. This 

proposed rule is not expected to raise any resource adequacy concerns, since reserve margins 

will not be impacted and the rule does not impose any additional requirements on existing 

facilities not triggering the reconstruction provision. There are no macroeconomic or 

employment impacts expected as a result of these proposed standards. 

9.4.2.1 Illustrative Analysis – Emission Reductions 

In the unlikely event that a unit were to trigger the modification provision, the proposed 

standards would result in some costs and benefits. Based on available data, we conducted an 

analysis of a hypothetical unit to illustrate the potential costs and benefits of the proposed 

standards. The hypothetical plant presented in this section is a coal-fired boiler172 and is assumed 

to be in compliance with all on-the-books federal regulations. In the illustrative analysis, costs 

and benefits are presented for compliance in 2025. Section 111(b) standards are subject to review 

every eight years. While we do not know when the hypothetical plant would choose to undertake 

 

172 IGCC and NGCC units are significantly less likely to trigger the modification provision due to the way in which 

these units are constructed. Simple-cycle combustion turbines (CT) have lower fuel efficiencies and produce a 

significantly higher cost of electricity (cost per kWh) at higher capacity factors and consequently are typically 

utilized at levels well below the proposed threshold for covered sources (1/3 of potential electric output). 

Historically, these units have most often been built to ensure reserve margins are met during peak periods 

(typically in the summer), and in some instances are able to generate additional revenues by selling capacity into 

power markets. Thus, in practice, EPA expects that potential CT units would not meet the applicability threshold 

in this proposed action and would not be subject to any standard. During the public comment period for the 

proposed 111(b) standards for newly constructed sources, the EPA has received comments regarding more recent 

integration of CT units and renewables and is taking comment on the treatment of these units. 

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a modification, it is necessary to select a year of analysis in order to value the climate benefits 

and health co-benefits resulting from these proposed standards. We have selected 2025 to 

approximate the end of the eight year period. All estimates are presented in 2011 dollars. 

The hypothetical unit used in this analysis is a 33 percent efficient 500 MW bituminous 

coal-fired unit operating at 78 percent capacity. The assumptions for capacity and efficiency 

were based on the average projected coal fleet in IPM in 2020. The emission rate specifications 

are (1) SO2 = 0.30 lb/MMBtu (3.3% weight Illinois bituminous coal with 95% efficient 

scrubber), (2) NOX = 0.30 lb/MMBtu (low NOX burners plus overfire air and SNCR), and (3) 

PM = 0.024 lb/MMBtu (8 lb/MMBtu ash with 99.7% control). In this analysis, we examine the 

costs and benefits that would occur if this unit were able to make a 4 percent, 6 percent, or 8 

percent heat rate improvement as a result of measures implemented in order to comply with the 

proposed standards for modified sources. 

Costs. We assume the hypothetical unit will implement a range of energy efficiency 

improvements at an annual cost of $8.3 million.173 At this cost, we estimate the typical unit 

would be able to implement a set of efficiency improvement measures that would achieve a heat 

rate improvement of approximately 6 percent. A heat rate improvement of 6 percent is 

approximately equivalent to an absolute efficiency improvement of 2 percent. The actual 

efficiency improvement a unit can achieve for this cost will depend on its starting efficiency and 

operating capacity. Less efficient units may have more efficiency improvement options available 

and be able to achieve greater efficiency for the same cost. Relatively more efficient units may 

have fewer remaining cost-effective options to improve efficiency. Improvements in efficiency 

will result in fuel savings, which can offset the cost of implementing those improvements. Cost 

and fuel savings information is shown in Table 9-3. 

For units that modify prior to being part of a section 111(d) existing source program that 

choose to comply with a source-specific standard that is a 2 percent improvement from the 

previous best performance, costs will vary depending on the current and prior performance of 

that unit. For a unit that modifies after being covered by a section 111(d) program, it is possible 

that the energy assessment may not identify any further efficiency improvements that unit can 

 

173 Calculated based on a total capital cost of $50 million ($100/kilowatt), financed over 15 years at a capital charge 

rate of 14.29%. The capital charge rate value and useful life are based on assumptions used when modeling the 

electricity sector in the Integrated Planning Model (IPM). Please see chapter 8 of EPA’s documentation for the 

IPM for more information on the assumed capital charge rate: http://www.epa.gov/airmarkets/progsregs/epaipm/docs/v513/Chapter_8.pdf. See the See Technical Support Document – GHG Abatement Measures” for 

information about the cost of efficiency improvements. 
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economically undertake considering the overall 111(d) program requirements. In those cases, 

there would be no additional costs to the unit as a result of this proposal. 

Table 9-29. Annualized Costs and Fuel Savings of Efficiency Improvements (millions of 

2011$) 

4% Efficiency 

Improvement 

6% Efficiency 

Improvement 

8% Efficiency 

Improvement 

Annual Cost $8.3 $8.3 $8.3 

Fuel Savings $3.7 $5.6 $7.5 

Net Cost $4.5 $2.6 $0.78 

Emission Reductions. By improving the efficiency of its operations, the hypothetical unit 

would reduce emissions of CO2 and may reduce emissions of (SO2), nitrogen dioxide (NOx), and 

fine particulate matter (PM2.5), which would lead to lower ambient concentrations of PM2.5 and 

ozone. Table 9-4 shows the expected emission reductions from each level of efficiency 

improvement for the hypothetical unit. For a unit participating in a 111(d) plan, it is possible that 

the CO2 emission reductions could be offset by increases elsewhere in the system depending on 

the structure of that plan. Ancillary emission reductions may be offset if, as a result of these 

reductions, a unit is able to reduce operation of pollution control equipment and still meet outputbased standards for these pollutants or pollutants related to their control (such as the Mercury 

and Air Toxics Standards limit for SO2 to control hydrogen chloride). Additionally, if efficiency 

improvements lead to decreased operating costs, it may result in changes to the frequency of 

dispatch for the unit. In that case, the unit may run more often, offsetting some of the emission 

decreases. Furthermore, for units that choose to comply with a source-specific standard that is a 

2 percent improvement from the previous best performance, emission reductions will vary 

depending on the current and prior performance of that unit. Additionally, it is possible that the 

energy assessment for a unit participating in a 111(d) program may not identify any further fuel 

efficiency improvements that unit can economically undertake after implementing the overall 
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111(d) program requirements. In those cases, there would be no additional emission reductions 

or control costs as a result of this proposal. 

Table 9-30. Emission Reductions from Efficiency Improvements (tons/year) 

4% Efficiency Improvement 6% Efficiency Improvement 8% Efficiency Improvement 

CO2 132,790 199,184 265,579 

SO2 214 321 428 

NOx (Total) 214 321 428 

NOx (Ozone Season) 89 134 178 

PM2.5 17 26 34 

Notes: SO2, NOX, and PM2.5 in short tons, CO2 in metric tonnes. 

Benefits. Reducing CO2 and criteria pollutant emissions will result in both climate and human 

health benefits. The impacts of these pollutants on the environment and health are discussed in 

detail in Chapter 4 of this RIA. In sum, to estimate climate benefits the EPA uses the U.S. 

government’s global social cost of carbon (USG SCC) estimates—i.e, the monetary value of 

impacts associated with a marginal change in CO2 emissions in a given year. The EPA has 

applied the USG SCC estimates to the CO2 reductions described above for the hypothetical unit. 

The four USG SCC estimates are as follows: $15, $50, $74, and $153 per metric ton of CO2

emissions in the year 2025 (2011$). To estimate human health co-benefits for this hypothetical 

scenario, the EPA used benefit-per-ton estimates for PM2.5 and ozone precursors described in 

detail in Chapter 4 of this RIA. Table 9-5 shows the quantified per ton co-benefits for reductions 

in SO2, directly emitted PM2.5, and NOX emissions in 2025. 
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Table 9-31. Summary of National Benefit-per-ton Estimates for EGUs in 2025 

Discount Rate

Pollutant 3% 7%

SO2 $41,000 to $93,000 $37,000 to $84,000 

Directly emitted PM2.5 (EC+OC) $150,000 to $350,000 $140,000 to $310,000 

Directly emitted PM2.5 (crustal) $17,000 to $39,000 $15,000 to $35,000 

NOX (as PM2.5) $6,000 to $14,000 $5,400 to $12,000 

NOX (as Ozone)* $4,900 to $21,000 

* Ozone co-benefits occur in analysis year, so they are the same for all discount rates. 

Note: See Table 4-8 for discussion of the assumptions, and uncertainty for these estimates. 

To estimate the benefits associated with improving efficiency of operations, we determine the 

emission reductions for efficiency improvements in Table 9-4 and apply the 2025 social benefit 

values discussed in Chapter 4. Specifically, we multiply the reduction in CO2 emissions by the 

estimates of the SCC, multiply the reduction in SO2, NOX, and PM2.5 emissions by the PM2.5-

related BPT estimates, multiply the reductions in ozone season NOX emissions by the ozonerelated BPT estimate, and add those values to get a measure of 2025 benefits. Tables 9-6, 9-7, 

and 9-8 show the climate, human health, and combined benefits expected based on the estimated 

emission reductions that would occur. These benefits are subject to the same uncertainties 

discussed for emission reductions in the previous section. 

Table 9‐32.  Estimated Global Climate Benefits of Illustrative CO2 Reductions in 2025 (millions of 2011$)*

Discount Rate and Statistic 4% Efficiency 

Improvement

6% Efficiency 

Improvement

8% Efficiency 

Improvement

Metric tonnes of CO2 reduced 132,790 199,184 265,579 

5% (average) $2.0 $3.0 $4.0 

3% (average) $6.7 $10 $13 

2.5% (average) $9.8 $15 $20 

3% (95th percentile) $20 $30 $41 

* The SCC values are dollar-year and emissions-year specific. SCC values represent only a partial accounting of 

climate impacts. 

   
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Table 9-33. Summary of Estimated Monetized Health Co-benefits of Illustrative Efficiency 

Improvements in 2025 (thousands of 2011$)* 

Pollutant 3% Discount Rate 7% Discount Rate 

4% Efficiency Improvement 

SO2 $8,900 to $20,000 $8,000 to $18,000

Directly emitted PM2.5 (EC+OC) $260 to $590 $240 to $530

Directly emitted PM2.5 (crustal) $230 to $510 $200 to $460

NOx (as PM2.5) $1,300 to $2,900 $1,200 to $2,600

NOx (as Ozone) $440 to $1,900 $440 to $1,900

Total $11,000 to $26,000 $10,000 to $23,000

6% Efficiency Improvement 

SO2 $13,000 to $30,000 $12,000 to $27,000

Directly emitted PM2.5 (EC+OC) $400 to $900 $360 to $810

Directly emitted PM2.5 (crustal) $350 to $780 $310 to $710

NOx (as PM2.5) $1,900 to $4,300 $1,700 to $3,900

NOx (as Ozone) $660 to $2,800 $660 to $2,800

Total $17,000 to $39,000 $15,000 to $35,000

8% Efficiency Improvement 

SO2 $18,000 to $40,000 $16,000 to $36,000

Directly emitted PM2.5 (EC+OC) $520 to $1,200 $470 to $1,100

Directly emitted PM2.5 (crustal) $450 to $1,000 $410 to $930

NOx (as PM2.5) $2,600 to $5,800 $2,300 to $5,200

NOx (as Ozone) $880 to $3,800 $880 to $3,800

Total $22,000 to $52,000 $20,000 to $47,000

* All estimates are rounded to two significant figures so numbers may not sum down columns. The estimated 

monetized co-benefits do not include climate benefits or health effects from direct exposure to NO2, SO2, and 

hazardous air pollutants (HAP); ecosystem effects; or visibility impairment. All fine particles are assumed to 

have equivalent health effects. The monetized co-benefits incorporate the conversion from precursor emissions 

to ambient fine particles and ozone. Co-benefits for PM2.5 and ozone are based on national benefit-per-ton 

estimates. Co-benefits for ozone are based on ozone season NOx emissions. Ozone co-benefits occur in analysis 

year, so they are the same for all discount rates. The health co-benefits reflect the sum of the PM2.5 and ozone 

co-benefits and reflect the range based on adult mortality functions (e.g., from Krewski et al. (2009) with Bell et 

al. (2004) to Lepeule et al. (2012) with Levy et al. (2005)). Confidence intervals are unavailable for this analysis 

because of the benefit-per-ton methodology. In general, the 95th percentile confidence interval for monetized 

PM2.5 benefits ranges from approximately -90 percent to +180 percent of the central estimates based on 

Krewski et al. (2009) and Lepeule et al. (2012). Emissions of directly emitted particles are disaggregated into 

EC+OC or crustal components using the method discussed in Appendix 4A of this RIA. 
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Table 9-34. Combined Estimated Climate Benefits and Health Co-Benefits of Illustrative 

Efficiency Improvements in 2025 (millions of 2011$)* 

SCC Discount Rate Climate 

Benefits Only 

Climate Benefits and Health Co-Benefits 

(Discount Rate Applied to Health Co-Benefits) 

3% 7% 

4% Efficiency Improvement 132,790 metric tonnes CO2

5% $2.0 $13 to $28 $12 to $25

3% $6.7 $18 to $33 $17 to $30

2.5% $9.8 $21 to $36 $20 to $33

3% (95th percentile) $20 $31 to $46 $30 to $44

6% Efficiency Improvement 199,184 metric tonnes CO2 

5% $3.0 $20 to $42 $18 to $38

3% $10 $27 to $49 $25 to $45

2.5% $15 $31 to $53 $30 to $50

3% (95th percentile) $30 $47 to $69 $45 to $66

8% Efficiency Improvement 265,579 metric tonnes CO2 

5% $4.0 $26 to $56 $24 to $51

3% $13 $35 to $65 $33 to $60

2.5% $20 $42 to $71 $40 to $67

3% (95th percentile) $41 $63 to $92 $61 to $88

*All estimates are rounded to two significant figures. Climate benefits are based on reductions in CO2 emissions. 

The estimated monetized co-benefits do not include climate benefits or health effects from direct exposure to 

NO2, SO2, and HAP; ecosystem effects; or visibility impairment. All fine particles are assumed to have 

equivalent health effects. The monetized co-benefits incorporate the conversion from precursor emissions to 

ambient fine particles and ozone. Co-benefits for PM2.5 and ozone are based on national benefit-per-ton 

estimates. Co-benefits for ozone are based on ozone season NOx emissions. Ozone co-benefits occur in analysis 

year, so they are the same for all discount rates. The health co-benefits reflect the sum of the PM2.5 and ozone 

co-benefits and reflect the range based on adult mortality functions (e.g., from Krewski et al. (2009) with Bell et 

al. (2004) to Lepeule et al. (2012) with Levy et al. (2005)). Confidence intervals are unavailable for this analysis 

because of the benefit-per-ton methodology. In general, the 95th percentile confidence interval for monetized 

PM2.5 benefits ranges from approximately -90 percent to +180 percent of the central estimates based on 

Krewski et al. (2009) and Lepeule et al. (2012). Emissions of directly emitted particles are disaggregated into 

EC+OC or crustal components using the method discussed in Appendix 4A of this RIA. 

Summary. In the unlikely event that a unit were to trigger the modification provision, the 

proposed standards would result in some costs and benefits. Based on the illustrative analysis of 

a hypothetical unit implementing efficiency measures in 2025 to comply with the proposed 

requirements, this proposal would result in a net benefit (benefits outweigh costs) for all levels of 

efficiency improvement and combinations of benefits. The net benefit would be even greater 

when potential fuel savings are taken into account. The actual costs, emission reductions, and 

benefits resulting from this proposal will vary based on the specifications of the modified unit, 
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the efficiency improvements undertaken, the unit’s participation in a section 111(d) plan, and the 

influence of the control requirements it faces for non-CO2 pollutants. 

9.5 Statutory and Executive Order Requirements 

9.5.1 Executive Order 12866, Regulatory Planning and Review, and Executive Order 

13563, Improving Regulation and Regulatory Review 

 Under Executive Order (EO) 12866 (58 FR 51,735, October 4, 1993), this action is a 

“significant regulatory action” because it “raises novel legal or policy issues arising out of legal 

mandates.” Accordingly, the EPA submitted this action to the Office of Management and Budget 

(OMB) for review under Executive Orders 12866 and 13563 (76 FR 3821, January 21, 2011) and 

any changes made in response to OMB recommendations have been documented in the docket 

for this action. In addition, the EPA prepared an analysis of the potential costs and benefits 

associated with this action. This analysis is presented in the preceding sections of this chapter. 

In the period of analysis (through 2025) the EPA anticipates few sources will trigger either 

the modification or the reconstruction provisions proposed. Because there have been a few units 

that have notified the EPA of NSPS modifications in the past, we have conducted an illustrative 

analysis of the costs and benefits for a representative unit that is presented above. 

9.5.2 Paperwork Reduction Act 

This proposed action is not expected to impose an information collection burden under the 

provisions of the Paperwork Reduction Act, 44 U.S.C. 3501 et seq. Burden is defined at 5 CFR 

1320.3(b). As previously stated, the EPA expects few modified or reconstructed EGUs in the 

period of analysis. Specifically, the EPA believes it unlikely that fossil fuel-fired electric utility 

steam generating units (utility boilers and IGCC units) or stationary combustion turbines will 

take actions that would constitute modifications or reconstructions as defined under the EPA’s 

NSPS regulations. Accordingly, this proposed action is not anticipated to impose any 

information collection burden over the 3-year period covered by the Information Collection 

Request (ICR) for this proposed rule. We have estimated, however, the information collection 

burden that would be imposed on an affected EGU if it was modified or reconstructed. The 

information collection requirements in this proposed rule have been submitted for approval to 

Deleted: , if any,

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OMB under the Paperwork Reduction Act, 44 U.S.C. 3501 et seq. The information collection 

request prepared by the EPA has been assigned the EPA ICR number 2465.03. 

 The EPA intends to codify the standards of performance in the same way for both this 

proposed action and the January 2014 proposal for newly constructed sources and is proposing 

the same recordkeeping and reporting requirements that were included in the January 2014 

proposal.174 (See 79 FR 1,498 and 1,499.) Although not anticipated, if an EGU were to modify or 

reconstruct, this proposed action would impose minimal information collection burden on 

affected sources, beyond what those sources would already be subject to under the authorities of 

CAA parts 75 and 98. The OMB has previously approved the information collection 

requirements contained in the existing part 75 and 98 regulations (40 CFR part 75 and 40 CFR 

part 98) under the provisions of the Paperwork Reduction Act, 44 U.S.C. 3501 et seq. and has 

assigned OMB control numbers 2060-0626 and 2060-0629, respectively. Apart from potential 

energy metering modifications to comply with net energy output based emission limits proposed 

in this action and certain reporting costs, which are mandatory for all owners/operators subject to 

CAA section 111 national emission standards, there would be no new information collection 

costs, as the information required by this proposed rule is already collected and reported by other 

regulatory programs. The recordkeeping and reporting requirements are specifically authorized 

by CAA section 114 (42 U.S.C. 7414). All information submitted to the EPA pursuant to the 

recordkeeping and reporting requirements for which a claim of confidentiality is made is 

safeguarded according to agency policies set forth in 40 CFR part 2, subpart B. 

Although, as stated above, the EPA expects few sources will trigger either the NSPS 

modification or reconstruction provisions that we are proposing, if an EGU were to modify or 

reconstruct during the three-year period covered by the ICR, it is likely that the EGU’s energy 

metering equipment would need to be modified to comply with proposed net energy output based 

CO2 emission limits. Specifically, the EPA estimates that it would take approximately three 

working months for a technician to retrofit existing energy metering equipment to meet the 

proposed net energy output requirements. In addition, after modifications are made that enable a 

facility to measure net energy output, each EGU’s Data Acquisition System (DAS) would need 

 

174 The information collection requirements in the January 2014 proposal have been submitted for approval to the 

OMB under the Paperwork Reduction Act, 44 U.S.C. 3501 et seq. The ICR document prepared by the EPA for 

the January 2014 proposal has been assigned the EPA ICR number 2465.02. 

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to be upgraded to accommodate reporting of net energy output rate based emissions. A modified 

or reconstructed EGU would be required to prepare a quarterly summary report, which includes 

reporting of emissions and downtime, every three months. The reporting burden for such a unit 

(averaged over the first three years after the effective date of the standards) is estimate to be 

$17,217 and 205 labor hours. Estimated cost burden is based on 2013 Bureau of Labor Statistics 

(BLS) labor cost data. Average burden hours per response are estimated to be 47.3 hours and the 

average number of annual responses over the three-year ICR period is 4.33 per year. Burden is 

defined at 5 CFR 1320.3(b). 

An agency may not conduct or sponsor, and a person is not required to respond to, a 

collection of information unless it displays a currently valid OMB control number. The OMB 

control numbers for EPA’s regulations in 40 CFR are listed in 40 CFR part 9. 

To comment on the Agency’s need for this information, the accuracy of the provided 

burden estimates, and any suggested methods for minimizing respondent burden, the EPA has 

established a public docket for this rule, which includes the ICR, under Docket ID number EPAHQ-OAR-2013-0603. Submit any comments related to the ICR to the EPA and OMB. See the 

addresses section in the preamble for where to submit comments to the EPA. Send comments to 

OMB at the Office of Information and Regulatory Affairs, Office of Management and Budget, 

725 17th Street, NW, Washington, DC 20503, Attention: Desk Officer for the EPA. Since OMB 

is required to make a decision concerning the ICR between 30 and 60 days after publication in 

the Federal Register, a comment to OMB is best assured of having its full effect if OMB receives 

it by 30 days after publication in the Federal Register. The final rule will respond to any OMB or 

public comments on the information collection requirements contained in this proposal. 

9.5.3 Regulatory Flexibility Act 

The Regulatory Flexibility Act (RFA) generally requires an agency to prepare a regulatory 

flexibility analysis of any rule subject to notice and comment rulemaking requirements under the 

Administrative Procedure Act or any other statute, unless the agency certifies that the rule will 

not have a significant economic impact on a substantial number of small entities. Small entities 

include small businesses, small organizations, and small governmental jurisdictions. 

For purposes of assessing the impacts of this rule on small entities, small entity is defined 

as: 
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1. A small business that is defined by the SBA’s regulations at 13 CFR 121.201 (for the 

electric power generation industry, the small business size standard is an ultimate 

parent entity with less than 750 employees). 

2. A small governmental jurisdiction that is a government of a city, county, town, school 

district or special district with a population of less than 50,000; and 

3. A small organization that is any not-for-profit enterprise which is independently 

owned and operated and is not dominant in its field. 

After considering the economic impacts of this proposed rule on small entities, we certify 

that this action will not have a significant economic impact on a substantial number of small 

entities. 

The EPA expects few modified utility boilers, IGCC units, or stationary combustion 

turbines in the period of analysis. An NSPS modification is defined as a physical or operational 

change that increases the source’s maximum achievable hourly rate of emissions. The EPA does 

not believe that there are likely to be EGUs that will take actions that would constitute 

modifications as defined under the EPA’s NSPS regulations. 

Because there have been a limited number of units that have notified the EPA of NSPS 

modifications in the past, the RIA for this proposed rule includes an illustrative analysis of the 

costs and benefits for a representative unit. 

Based on the analysis, the EPA estimates that this proposed rule could result in CO2

emission changes, quantified benefits, or costs for a hypothetical unit that triggered the 

modification provision. However, we do not anticipate this proposed rule would impose 

significant costs on those sources, including any that are owned by small entities. 

In addition, the EPA expects few The EPA expects few reconstructed fossil fuel-fired 

electric utility steam generating units (utility boilers and IGCC units) or stationary combustion 

turbines in the period of analysis. Reconstruction occurs when a single project replaces 

components or equipment in an existing facility and exceeds 50 percent of the fixed capital cost 

that would be required to construct a comparable entirely new facility. Due to the limited data 

available on reconstructions, it is not possible to conduct a representative illustrative analysis of 

what costs and benefits might result from this proposal in the unlikely case that a unit were to 

reconstruct. However, based on the low number of previous reconstructions and the BSER 

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determination based on the most efficient available generating technology, we would expect this 

proposal to result in no significant CO2 emission changes, quantified benefits, or costs for NSPS 

reconstructions. 

Nevertheless, the EPA is aware that there is substantial interest in the proposed rule among 

small entities (municipal and rural electric cooperatives). As summarized in section II.G. of the 

preamble, the EPA has conducted an unprecedented amount of stakeholder outreach. As part of 

that outreach, agency officials participated in many meetings with individual utilities as well as 

meetings with electric utility associations. Specifically, the EPA Administrator, Gina McCarthy, 

participated in separate meetings with both the National Rural Electric Cooperative Association 

(NRECA) and the American Public Power Association (APPA). The meetings brought together 

leaders of the rural cooperatives and public power utilities from across the country. The 

Administrator discussed and exchanged information on the unique challenges, in particular the 

financial structure of NRECA and APPA member utilities. A detailed discussion of the 

stakeholder outreach is included in the preamble to the emission guidelines for existing affected 

electric utility generating units being proposed in a separate action. 

In addition, as described in the RFA section of the preamble to the proposed standards of 

performance for GHG emissions from newly constructed EGUs (79 FR 1499 and1500, January 

8, 2014), the EPA conducted outreach to representatives of small entities while formulating the 

provisions of the proposed standards. Although only newly constructed EGUs would be affected 

by those proposed standards, the outreach regarded planned actions for newly constructed, 

reconstructed, modified and existing sources. 

While formulating the provisions of the proposed rule, the EPA considered the input 

provided over the course of the stakeholder outreach. We invite comments on all aspects of this 

proposal and its impacts, including potential impacts on small entities. 

9.5.4 Unfunded Mandates Reform Act (UMRA) 

This proposed rule does not contain a federal mandate that may result in expenditures of 

$100 million or more for state, local, and tribal governments, in the aggregate, or the private 

sector in any one year. As previously stated, the EPA expects few modified or reconstructed 

fossil fuel-fired electric utility steam generating units (utility boilers and IGCC units) or 

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stationary combustion turbines in the period of analysis. Accordingly, this proposed rule is not 

subject to the requirements of sections 202 or 205 of UMRA. 

This proposed rule is also not subject to the requirements of section 203 of UMRA because 

it contains no regulatory requirements that might significantly or uniquely affect small 

governments. 

In light of the interest among governmental entities, the EPA initiated consultations with 

governmental entities while formulating the provisions of the proposed standards for newly 

constructed EGUs. This outreach regarded planned actions for newly constructed, reconstructed, 

modified and existing sources. As described in the UMRA discussion in the preamble to the 

proposed standards of performance for GHG emissions from new EGUs (79 FR 1500 and 1501, 

January 8, 2014), the EPA consulted with the following 10 national organizations representing 

state and local elected officials: 

 National Governors Association 

 National Conference of State Legislatures 

 Council of State Governments 

 National League of Cities 

 U.S. Conference of Mayors 

 National Association of Counties 

 International City/County Management Association 

 National Association of Towns and Townships 

 County Executives of America 

 Environmental Council of States 

On February 26, 2014, the EPA re-engaged with those governmental entities to provide a 

pre-proposal update on the emission guidelines for existing EGUs and emission standards for 

modified and reconstructed EGUs. 

While formulating the provisions of these proposed standards, the EPA also considered the 

input provided over the course of extensive stakeholder outreach conducted by the EPA (see 

section II.G. of the preamble for more information). 
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9.5.5 Executive Order 13132, Federalism 

This proposed action does not have federalism implications. It would not have substantial 

direct effects on the States, on the relationship between the national government and the States, 

or on the distribution of power and responsibilities among the various levels of government, as 

specified in EO 13132. This proposed action would not impose substantial direct compliance 

costs on state or local governments, nor would it preempt state law. Thus, EO 13132 does not 

apply to this action. 

However, as described in the Federalism discussion in the preamble to the proposed 

standards of performance for GHG emissions from newly constructed EGUs (79 FR 1501, 

January 8, 2014), the EPA consulted with state and local officials in the process of developing 

the proposed standards for newly constructed EGUs. This outreach regarded planned actions for 

newly constructed, reconstructed, modified and existing sources. The EPA engaged 10 national 

organizations representing state and local elected officials. The UMRA discussion in the 

preamble to the proposed standards of performance for GHG emissions from newly constructed

EGUs (79 FR 1500 and 1501, January 8, 2014) includes a description of the consultation. In 

addition, on February 26, 2014, the EPA re-engaged with those governmental entities to provide 

a pre-proposal update on the emission guidelines for existing EGUs and emission standards for 

modified and reconstructed EGUs. While formulating the provisions of these proposed 

standards, the EPA also considered the input provided over the course of the extensive 

stakeholder outreach conducted by the EPA (see section II.G. of the preamble). In the spirit of 

EO 13132, and consistent with the EPA policy to promote communications between the EPA 

and state and local governments, the EPA specifically solicits comment on this proposed action 

from state and local officials. 

9.5.6 Executive Order 13175, Consultation and Coordination with Indian Tribal 

Governments 

 This action does not have tribal implications, as specified in Executive Order 13175 (65 

FR 67249, November 9, 2000). It would neither impose substantial direct compliance costs on 

tribal governments, nor preempt Tribal law. This proposed rule would impose requirements on 

owners and operators of reconstructed and modified EGUs. The EPA is aware of three coal-fired 

EGUs located in Indian Country but is not aware of any EGUs owned or operated by tribal 
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entities. The EPA notes that this proposal would only affect existing sources such as the three 

coal-fired EGUs located in Indian Country, if those EGUs were to take actions constituting 

modifications or reconstructions as defined under the EPA’s NSPS regulations. However, as 

previously stated, the EPA expects few modified or reconstructed EGUs in the period of 

analysis. Thus, Executive Order 13175 does not apply to this action. 

Although Executive Order 13175 does not apply to this action, the EPA conducted 

outreach to tribal environmental staff and offered consultation with tribal officials in developing 

this action. Because the EPA is aware of tribal interest in carbon pollution standards for the 

power sector, prior to proposal of GHG standards for newly constructed power plants, the EPA 

offered consultation with tribal officials early in the process of developing the proposed 

regulation to permit them to have meaningful and timely input into its development. The EPA’s 

consultation regarded planned actions for newly constructed, reconstructed, modified, and 

existing sources. The Consultation and Coordination with Indian Tribal Governments discussion 

in the preamble to the proposed standards of performance for GHG emissions from newly 

constructed EGUs (79 FR 1501, January 8, 2014) includes a description of that consultation. 

During development of this proposed regulation, consultation letters were sent to 584 tribal 

leaders. The letters provided information regarding the EPA’s development of both the NSPS for 

modified and reconstructed EGUs and emission guidelines for existing EGUs and offered 

consultation. None have requested consultation. Tribes were invited to participate in the national 

informational webinar held August 27, 2013, and to which tribes were invited. In addition, a 

consultation/outreach meeting was held on September 9, 2013, with tribal representatives from 

some of the 584 tribes. The EPA also met with tribal environmental staff with the National 

Tribal Air Association, by teleconference, on July 25, 2013, and December 19, 2013. In those 

teleconferences, the EPA provided background information on the GHG emission guidelines to 

be developed and a summary of issues being explored by the Agency. Additional detail 

regarding this stakeholder outreach is included in the executive order discussion for the emission 

guidelines for existing affected electric utility generating units in Chapter 7 of this RIA. The 

EPA also held a series of listening sessions prior to proposal of GHG standards for newly 

constructed power plants. Tribes participated in a session on February 17, 2011, with state 

agencies, as well as in a separate session with tribes on April 20, 2011. 

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The EPA will also hold additional meetings with tribal environmental staff during the 

public comment period, to inform them of the content of this proposal, and offer further 

consultation with tribal elected officials where it is appropriate. We specifically solicit additional 

comment from tribal officials on this proposed rule. 

9.5.7 Executive Order 13045, Protection of Children from Environmental Health Risks and 

Safety Risks 

The EPA interprets EO 13045 (62 FR 19885, April 23, 1997) as applying to those 

regulatory actions that concern health or safety risks, such that the analysis required under 

section 5-501 of the Order has the potential to influence the regulation. This action is not subject 

to EO 13045 because it is based solely on technology performance.

9.5.8 Executive Order 13211, Actions Concerning Regulations that Significantly Affect 

Energy Supply, Distribution, or Use 

This proposed action is not a “significant energy action” as defined in EO 13211 (66 FR 

28355, May 22, 2001), because it is not likely to have a significant adverse effect on the supply, 

distribution, or use of energy. As previously stated, the EPA expects few reconstructed or 

modified EGUs in the period of analysis and impacts on emissions, costs or energy supply 

decisions for the affected electric utility industry to be minimal as a result. 

9.5.9 National Technology Transfer and Advancement Act 

Section 12(d) of the NTTAA of 1995 (Public Law No. 104-113; 15 U.S.C. 272 note) 

directs the EPA to use voluntary consensus standards (VCS) in their regulatory and procurement 

activities unless to do so would be inconsistent with applicable law or otherwise impractical. 

VCS are technical standards (e.g., materials specifications, test methods, sampling procedures, 

business practices) developed or adopted by one or more voluntary consensus bodies. The 

NTTAA directs the EPA to provide Congress, through annual reports to the OMB, with 

explanations when an agency does not use available and applicable VCS. 

This proposed rulemaking involves technical standards. The EPA proposes to use the 

following standards in this proposed rule: 

 ASTM D388-12 (Standard Classification of Coals by Rank) 

 ASTM D396-13c (Standard Specification for Fuel Oils) 

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 ASTM D975-14 (Standard Specification for Diesel Fuel Oils) 

 D3699-13b (Standard Specification for Kerosene) 

 D6751-12 (Standard Specification for Biodiesel Fuel Blend Stock [B100] 

for Middle Distillate Fuels) 

 ASTM D7467-13 (Standard Specification for Diesel Fuel Oil, Biodiesel 

Blend [B6 to B20]) 

 ANSI C12.20 (American National Standards for Electricity Meters – 0.2 

and 0.5 Accuracy Classes). 

The EPA is proposing use of Appendices A, B, D, F and G to 40 CFR part 75. These 

Appendices contain standards that have already been reviewed under the NTTAA. The EPA 

welcomes comments on this aspect of the proposed rulemaking and, specifically, invites the 

public to identify potentially-applicable VCS and to explain why such standards should be used 

in this action.

9.5.10 Executive Order 12898: Federal Actions to Address Environmental Justice in 

Minority Populations and Low-Income Populations 

 Executive Order 12898 (59 FR 7629, February 16, 1994) establishes federal executive 

policy on environmental justice. Its main provision directs federal agencies, to the greatest extent 

practicable and permitted by law, to make environmental justice part of their mission by 

identifying and addressing, as appropriate, disproportionately high and adverse human health or 

environmental effects of their programs, policies, and activities on minority populations and lowincome populations in the U.S. 

 This proposed rule limits GHG emissions from modified and reconstructed fossil fuelfired electric utility steam generating units (utility boilers and IGCC units) and stationary 

combustion turbines by establishing national emission standards for CO2. The EPA has 

determined that this proposed rule would not result in disproportionately high and adverse 

human health or environmental effects on minority, low-income, and indigenous populations 

because it does not affect the level of protection provided to human health or the 

environment. As previously stated, the EPA expects few modified or reconstructed fossil fuelfired electric utility steam generating units (utility boilers and IGCC units) or stationary 

combustion turbines in the period of analysis. 

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9.6 References 

Bell, M.L., et al. 2004. “Ozone and Short-Term Mortality in 95 U.S. Urban Communities, 1987-

2000.” Journal of the American Medical Association, 292(19): p. 2372-8. 

Krewski D.; M. Jerrett; R.T. Burnett; R. Ma; E. Hughes; Y. Shi, et al. 2009. Extended Follow-Up 

and Spatial Analysis of the American Cancer Society Study Linking Particulate Air Pollution 

and Mortality. HEI Research Report, 140, Health Effects Institute, Boston, MA. 

Lepeule, J.; F. Laden; D. Dockery; J. Schwartz. 2012. “Chronic Exposure to Fine Particles and 

Mortality: An Extended Follow-Up of the Harvard Six Cities Study from 1974 to 2009.” 

Environmental Health Perspectives, July, 120(7):965-70. 

Levy, J.I.; S.M. Chemerynski and J.A. Sarnat. 2005. “Ozone Exposure and Mortality: An 

Empiric Bayes Metaregression Analysis.” Epidemiology, 16(4): pp. 458-68. 
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9-1 

United States Environmental Protection Agency 

Office of Air Quality Planning and Standards 

[Name of Division] 

Research Triangle Park, NC 

Publication No. EPA-45X/X-XXXXX

[Month, Year]
Page 10: [1] Deleted Author 

Page 2: [2] Deleted Author 

4.2.1 Public Health Effects from Climate Change[A1]

Climate change threatens public health in a number of ways: direct temperature effects, the 

effect of higher atmospheric CO2 concentrations on characteristics of air quality, changes in 

vector-borne diseases, and changes in the severity and frequency of extreme weather events. This 

section summarizes the 2009 Endangerment Finding’s conclusions for each of these effects in 

turn.1

Heat is already the leading cause of weather-related deaths in the United States, and heat 

waves are associated with marked short-term increases in mortality and morbidity. It has already 

been observed that unusually hot days and heat waves are becoming more frequent, and that 

unusually cold days are becoming less frequent. In the future, severe heat waves are projected to 

further intensify in magnitude and duration over the portions of the United States where these 

events have already been observed. If this observed warming trend continues as projected, it is 

expected that heat-related mortality and morbidity will increase. Different segments of the 

population are sensitive for different reasons, with older adults, the chronically sick, the very 

young, city-dwellers, and those taking medications that disrupt thermoregulation being the most 

sensitive to hot temperatures. Other groups that have also been found to be sensitive to hot 

temperatures are the mentally ill, those lacking access to air conditioning, those working or 

playing outdoors, and socially isolated persons. With continued warming over time, these 

adverse effects would be expected to increase as serious heat events become more frequent, 

prolonged, and extreme. 

Conversely, increases in temperature are also expected to lead to some reduction in the risk 

of death, related to extreme cold. Evidence suggests that the net impact of changes in heat and 

cold mortality is likely to be adverse. At the time of the Finding, the U.S. Global Change 

Research Program (USGCRP, 2009) referenced a study which found that reductions in deaths 

related to the projected decline in extreme cold events were not expected to compensate for the 

 

1

 For more information on the impacts of climate change see the 2009 Endangerment Finding. “Endangerment and 

Cause or Contribute Findings for Greenhouse Gases Under Section 202(a) of the Clean Air Act,” 74 Fed. Reg. 

66,496 (Dec. 15, 2009). http://www.epa.gov/climatechange/endangerment/ 
projected increase in heat-related deaths: the most recent report (USGRP, 2014) has further 

confirmed that conclusion. The tendency for mortality rates to increase in winter occurs for 

reasons which are not strongly correlated with cold temperatures, such as influenza. Analyses of 

the effects of warmer winters on mortality must consider these relationships to avoid 

overestimating the effects of temperature increases during that season. 

Climate change is expected to increase regional ozone pollution, relative to ozone levels in 

the absence of climate change. Increased levels of ozone are associated with risks of respiratory 

illnesses and premature death. In addition to human health effects, tropospheric ozone has 

significant adverse effects on crop yields, pasture and forest growth, and the composition of plant 

and animal species populations, pasture and forest growth, and the composition of plant and 

animal species populations. 

Peer reviewed modeling studies discussed in EPA’s Interim Assessment (U.S. EPA, 2009a) 

show that climate change is likely to cause increases in summertime ozone concentrations over 

substantial regions of the country, especially on the highest ozone days and in the largest 

metropolitan areas with the worst ozone problems. This effect was not uniform across the 

country, with some areas projected to have little change or slight decreases, though the decreases 

are expected to be less pronounced and occur in less populous regions than the increases. The 

key metric for regulating U.S. air quality is the maximum daily 8-hour average ozone 

concentration. For those regions where modeling projected climate-induced increases, the 

increase in 2050 was in the range of 2 to 8 ppb, averaged over the summer season. The increases 

were substantially greater than 2 to 8 ppb during the peak pollution episodes that tend to occur 

over a number of days each summer. 

In addition to direct temperature health effects and climate change induced air quality 

effects, there is also the potential for increased mortality rates, injuries, infectious diseases, and 

stress-related disorders resulting from more frequent extreme weather events. 

Climate change is expected to lead to an increase in the frequency of heavy precipitation 

events, which would be associated with increased risk of deaths and injuries, as well as 

infectious, respiratory and skin diseases. Floods are low-probability, high-impact events that can 

overwhelm physical infrastructure, human resilience, and social organization. Floods can result 
in health impacts such as deaths, injuries, infectious diseases, toxic contamination, and mental 

health problems. 

Climate change is expected to lead to increases tropical cyclone intensity (hurricanes and 

tropical storms). Increases in tropical cyclone intensity are linked to increases in the risk of 

deaths, injuries, waterborne and food borne diseases, as well as post-traumatic stress disorders. 

Storm surge is the leading cause of death in coastal storms, and the risk of death by drowning 

due to surge is expected to increase with rising sea levels and increased storm intensity as the 

result of climate change. Projected increases in flooding due to increased intensity of cyclonic 

events is also expected to lead to adverse public health impacts as noted above. 

According to the assessment literature, under changing climate and environmental 

conditions there will also likely be an increase in the spread of serial episodes of food and waterborne pathogens among susceptible populations, depending on the pathogens’ survival, 

persistence, habitat range and transmission. Food borne diseases show some relationship with 

temperature. The range of some zoonotic disease carriers, such as the Lyme disease-carrying 

tick, may increase with temperature. 

Increases in atmospheric CO2 concentrations directly as well as changes in the climate are 

expected to stimulate plants to increase photosynthesis, biomass, water use efficiency, and 

reproductive effort resulting in greater growth and distribution of weeds, grasses, and trees. Such 

increases could lead to greater production, distribution, dispersion, and allergenicity of 

aeroallergens. These changes in aeroallergens and subsequent human exposures could affect the 

prevalence and severity of allergy symptoms. However, the scientific literature does not provide 

definitive data or conclusions on how climate change might impact aeroallergens and 

subsequently the prevalence of allergenic illnesses in the U.S. The IPCC concluded that pollens 

are likely to increase with elevated temperature and CO2 (IPCC, 2007). 

4.2.2 Public Welfare Effects from Climate Change 

As with public health, there are multiple pathways in which the greenhouse gas air 

pollution and resultant climate change affect climate-sensitive economic sectors and 

environmental media. These sectors include agriculture; forestry; water resources; sea level rise 

in coastal areas; energy, infrastructure, and settlements; and ecosystems and wildlife. Impacts 
from climate change will also occur outside of the United States. This section summarizes the 

2009 Endangerment Finding’s conclusions for each of these effects.2

As noted above, elevated CO2 concentrations and modest temperature increases may 

stimulate plants to increase photosynthesis, biomass, water use efficiency, and reproductive 

effort. These impacts and the potential for longer growing seasons may result in increased 

agricultural productivity. But, the same effects may also enhance pest and weed growth. Further 

temperature increases, possible changes to precipitation patterns and variability, and any 

increases in ground-level ozone induced by higher temperatures are expected to reduce 

agricultural productivity. A USGCRP report (2009) concluded that while for some crops such as 

grain and oilseed crops there may be, on net, a beneficial effect over the next couple decades, as 

temperature rises, these crops will begin to experience failure, especially if climate variability 

increases and precipitation lessens or becomes more variable. Changes in the intensity and 

frequency of extreme weather events, such as droughts and heavy storms, have the potential to 

negatively impact U.S. agriculture. Changes in precipitation patterns, in addition to increasing 

temperatures and longer growing seasons, can also change the demand for irrigation 

requirements and could potentially increase irrigation demand. 

With respect to livestock, higher temperatures will very likely reduce livestock production 

during the summer season in some areas, but these losses will very likely be partially offset by 

warmer temperatures during the winter season. The impact on livestock productivity due to 

increased variability in weather patterns, will likely be far greater than the effects associated with 

an absolute change in average climatic conditions. 

For the forestry sector, the effects are similar to the agriculture sector. There is the 

potential for beneficial effects due to elevated concentrations of carbon dioxide, modest 

temperature increases, and nitrogen deposition, but there is also the potential for adverse effects 

from higher temperature increases, changing precipitation patterns, increased populations and 

spread of insects and disease, and the potential for more frequent and severe extreme weather 

events. According to the science assessment reports upon which the Administrator relied for the 

2009 Endangerment Finding, climate change has very likely increased the size and number of 

 

2

 “Endangerment and Cause or Contribute Findings for Greenhouse Gases Under Section 202(a) of the Clean Air 

Act,” 74 Fed. Reg. 66,496 (Dec. 15, 2009) (“Endangerment Finding”). 
wildfires, insect outbreaks, and increased tree mortality in the Interior West, the Southwest, and 

Alaska, and will continue to do so. 

If existing trends in precipitation continue, it is expected that forest productivity will likely 

decrease in the Interior West, Southwest, eastern portions of the Southeast and Alaska. Forest 

productivity will likely increase in the northeastern United States, Lake States, and in western 

portions of the Southeast. An increase in forecast drought events, as a result of climate change, is 

also likely to reduce forest productivity where such events occur. 

The connection of water resources to climate change is very important, given the 

increasing demand for adequate water supplies and services for agricultural, municipal, energy, 

and industrial uses, coupled with existing strains on this scarce resource in many parts of the 

country. According to the assessment literature, climate change has already altered, and will 

likely continue to alter the water cycle, affecting where, when, and how much water is available 

for all uses. With higher temperatures, the water-holding capacity of the atmosphere and 

evaporation into the atmosphere increase, and this favors increased climate variability, with more 

intense precipitation and more droughts. 

Climate change is and will continue to cause the shrinking of the snowpack, induced by 

increasing temperatures. In the western United States, there is already well-documented evidence 

of a shrinking snowpack due to climate warming. Earlier meltings, with increased runoff in the 

winter and early spring, increase flood concerns and also result in substantially decreased 

summer flows. This pattern of reduced snowpack and changes to the flow patterns pose serious 

risks to major population regions, such as California, which rely on snowmelt-dominated 

watersheds for their water supply. Increased precipitation is expected to increase total water flow 

in some eastern areas leading to increased flood risk and potential water pollution. Despite the 

increased average flow, increased variability may still enable periods of drought. 

Climate change will likely further constrain over-allocated water resources in some regions 

of the United States, increasing competition among agricultural, municipal, industrial, and 

ecological uses. Increased incidence of extreme weather and floods may also overwhelm or 

damage water treatment and management systems, resulting in water quality problems. 

According to the assessment literature, sea level is rising along much of the U.S. coast and 

the rate of change will very likely increase in the future, exacerbating the impacts of progressive 
inundation, storm-surge flooding, and shoreline erosion. A large percentage of the U.S. 

population lives in these coastal areas. The most vulnerable areas are the Atlantic and Gulf 

Coasts, the Pacific Islands, and parts of Alaska. Cities such as New Orleans, Miami, and New 

York are particularly at risk, and could have difficulty coping with the sea level rise projected by 

the end of the century under a higher emissions scenario. Population growth and the rising value 

of infrastructure increases the vulnerability of coastal areas to climate variability and future 

climate change. Adverse impacts on islands present concerns for Hawaii and the U.S. territories. 

Reductions in Arctic sea ice increases extreme coastal erosion in Alaska, due to the increased 

exposure of the coastline to strong wave action. In the Great Lakes, where sea level rise is not a 

concern, both extremely high and low water levels, resulting from changes to the hydrological 

cycle, have been damaging and disruptive to shoreline communities. 

Coastal wetland loss is being observed in the United States where these ecosystems are 

squeezed between natural and artificial landward boundaries and rising sea levels. Up to 21 

percent of the remaining coastal wetlands in the U.S. mid-Atlantic region are potentially at risk 

of inundation between 2000 and 2100. Stress will increase on coastal habitats through the 

interaction of climate change with development and pollution related to development. 

Although increases in mean sea level over the 21st century and beyond are projected to 

inundate unprotected, low-lying areas, the most devastating impacts are likely to be associated 

with storm surge. In combination, expected rates of sea level rise, projected storm intensity, 

wave height, and storm surge all suggest more severe coastal flooding and erosion hazards. 

Higher sea level provides an elevated base from which storm surges occur and diminishes the 

rate at which low-lying areas drain, increasing the risk of flooding from rainstorms. In New York 

City and Long Island, flooding from a combination of sea level rise and storm surge could be 

several meters deep. Projections suggest that the recurrence period of a 100-year flood event in 

this area might be reduced to 4–60 years by the 2080s. Additionally, some major urban centers in 

the U.S., such as areas of New Orleans are situated in low-lying flood plains, presenting 

increased risk from storm surges. 

With respect to infrastructure, climate change vulnerabilities of industry, settlement, and 

society are more related to changes in the intensity and frequency of extreme weather events than 

gradual changes in temperature. Extreme weather events could threaten U.S. energy 
infrastructure (transmission and distribution), transportation infrastructure (roads, bridges, 

airports and seaports), water infrastructure, and other built aspects of human settlements. 

Moreover, soil subsidence caused by the melting of permafrost in the Arctic region is a risk to 

gas and oil pipelines, electrical transmission towers, roads, and water systems. 

Within settlements experiencing climate change stressors, certain parts of the population 

may be especially vulnerable based on their circumstances. These include the poor, the elderly, 

the very young, those already in poor health, the disabled, those living alone, and/or indigenous 

populations dependent on one or a few resources. In Alaska, indigenous communities are likely 

to experience disruptive impacts, including shifts in the range or abundance of wild species 

crucial to their livelihoods and well-being. 

Climate change is exerting major influences on natural environments and biodiversity, and 

these influences are generally expected to grow with increased warming. Observed changes in 

the life cycles of plants and animals include shifts in habitat ranges, timing of migration patterns, 

and changes in reproductive timing and behavior. 

The underlying assessment literature finds with high confidence that substantial changes in 

the structure and functioning of terrestrial ecosystems are very likely to occur with global 

warming greater than 2 to 3 °C above pre-industrial levels, with predominantly negative 

consequences for biodiversity and the provisioning of ecosystem goods and services. With global 

average temperature changes above 2 °C, many terrestrial, freshwater, and marine species 

(particularly endemic species), are at far greater risk of extinction than in the geological past. 

Climate change and ocean acidification will likely impair a wide range of planktonic and other 

marine calcifiers such as corals. Even without ocean acidification effects, increases in sea surface 

temperature of about 1 to 3 °C are projected to result in more frequent coral bleaching events and 

widespread coral mortality. In the Arctic, wildlife faces great challenges from the effects of 

climatic warming, as projected reductions in sea ice will drastically shrink marine habitat for 

polar bears, ice-inhabiting seals, and other animals. 

Some common forest types are projected to expand, others are projected to contract, and 

others, such as spruce-fir, are likely to disappear from the contiguous United States. Changes in 

plant species composition in response to climate change can increase ecosystem vulnerability to 

other disturbances, including wildfires and biological invasion. Disturbances such as wildfires 
and insect outbreaks are increasing in the United States and are likely to intensify with warmer 

winters, drier soils and longer growing seasons in the future. The areal extent of drought-limited 

ecosystems is projected to increase 11 percent per °C warming in the United States. In 

California, temperature increases greater than 2 °C may lead to conversion of shrubland into 

desert and grassland ecosystems and evergreen conifer forests into mixed deciduous forests. 

Greater intensity of extreme events may alter disturbance regimes in coastal ecosystems leading 

to changes in diversity and ecosystem functioning. Species inhabiting salt marshes, mangroves, 

and coral reefs are likely to be particularly vulnerable to these effects. 

According to the USGCRP report of June 2009 and other sources, climate [A2]change 

impacts in certain regions of the world may exacerbate problems that raise humanitarian, trade, 

and national security issues for the United States.3

 The IPCC (2007) identifies the most 

vulnerable regions of the world as: 

Africa, especially the sub-Saharan region, because of current low adaptive capacity as 

well as climate change 

Small islands due to high exposure of population and infrastructure to risk of sea-level 

rise and increased storm surge 

Asian mega-deltas due to large populations and high exposure to sea level rise, storm 

surge, and river flooding 

The Arctic because of the effects of high rates of projected warming on natural 

systems 

Climate change has been described as a potential threat multiplier with regard to national 

security issues. While some of these international risks do not readily lend themselves to precise 

analyses or future projections, given the unavoidable global nature of the climate change 

problem it is appropriate and prudent to consider how impacts in other world regions may 

present risks to the U.S. population. 

Page 3: [3] Comment [A59] Author 

OMB comment: Need a more precise term than “larger”. One might infer from the sentence that the new 

assessments are larger with respect to the most likely scenario for SLR. However, my recollection is that at least 

 

3

 ‘‘In an increasingly interdependent world, U.S. vulnerability to climate change is linked to the fates of other 

nations. For example, conflicts or mass migrations of people resulting from food scarcity and other resource 

limits, health impacts or environmental stresses in other parts of the world could threaten U.S. national 

security.’’ (Karl et al., 2009). 
one of the new assessments is only “larger” with respect to the upward bound of SLR. Suggest adding a sentence or 

two to explain which estimator is larger (e.g., mean, median, upward bound of range, etc.). 

EPA response: Comparisons between assessments can be a bit tricky because of differences in emissions scenario 

and differences in baseline: 

For example, the 0.5-1.0m from the NRC climate stabilization assessment is specifically the A1B scenario, which 

should be compared to the 0.21 to 0.48 A1B range from AR4. The other NRC assessment low end estimates are 0.4 

and 0.5 m respectively, and the NCA low end is 30 cm (1 foot). 

The raw AR5 assessment range is 0.26 to 0.82 m, which is larger than 0.18 to 0.59 meters even as a raw estimate. 

However, AR5 includes the RCP2.6 emissions scenario which is a much lower scenario than anything considered by 

AR4 (which didn’t consider explicit mitigation scenarios). Also, AR4 reported SLR as being the difference of 2090-

99 and 1980-1999, whereas AR5 reported the difference between 2081-2100 and 1986-2005: to correct for this 

would require adding several more centimeters to the AR5 values. 

Page 3: [4] Comment [A61] Author 

OMB suggested edit: “increases” 

EPA response: Done..