### Natural Gas Infrastructure Implications of Increased Demand from the Electric Power Sector

U.S. Department of Energy Page i

### Natural Gas Infrastructure Implications of Increased Demand from the Electric Power Sector

U.S. Department of Energy Page iii 

## Table of Contents

Executive Summary

................................ ................................ ................................ ................................ ....... v

1. Introduction

................................ ................................ ................................ ................................ .......... 1
1.1 Purpose of This Study

................................ ................................ ................................ .......................... 1 1.2 Recent Developments in the U.S. Natural Gas Sector

................................ ................................ ........ 2

1.3 Economics of Natural Gas Transmission

................................ ................................ ............................. 3

1.4 Institutional Considerations

................................ ................................ ................................ ................ 4

2. Model Description, Limitations, and Scenarios

................................ ................................ .................... 7
2.1 Model Description

................................ ................................ ................................ ............................... 7 2.2 Modeling Limitations

................................ ................................ ................................ .......................... 8

2.3 Description of Scenarios

................................ ................................ ................................ ................... 10

3. Model Results

................................ ................................ ................................ ................................ ..... 13

3.1 Natural Gas Demand

................................ ................................ ................................ ......................... 13 3.2 Natural Gas Supply

................................ ................................ ................................ ............................ 17

3.3 Na tural Gas Prices

................................ ................................ ................................ ............................. 18

3.4 Natural Gas Transmission

................................ ................................ ................................ ................. 20 3.5 Expenditures on Natural Gas Transmission Infrastructure

................................ ............................... 26

4. Conclusion

................................ ................................ ................................ ................................ ........... 31
Appendix A. Additional Figures

................................ ................................ ................................ ................... 33
Appendix A.1 Map of Electric Power Sector Natural Gas Demand Regions

................................ ........... 33 Appendix A.2 Map of Lowe r 48 States Shale Plays

................................ ................................ ................. 34 Appendix A.3 Map of Natural Gas Pipeline Expansion Regions

................................ .............................. 35 Appendix B. Electric Power Sector Results

................................ ................................ ................................ . 37

### Natural Gas Infrastructure Implications of Increased Demand from the Electric Power Sector

U.S. Department of Energy Page v 

## Executive Summary

The natural gas sector in the United States has been fundamentally transformed by technological advancements in horizontal drilling and hydraulic fracturing that have enabled the economic extraction of natural gas from shale formations. This breakthrough h as , in turn
, unlocked new, geographically diverse natural gas resources that are unprecedented in size.

The a vailability of a bundant
, low

- cost natural gas has increased demand for natural gas from multiple
end

- use sectors . In the electric power sector, wh ich is currently the largest consumer of natural gas in the United States, the record

- low natural gas prices during the month of April 2012 drove generation from natural gas to virtually match that of coal. While coal has regained some of its market share
because of gradually rising natural gas prices, the combination of favorable economics and the lower conventional air pollution and greenhouse gas emissions associated with natural gas relative to other
fossil fuels is likely to contribute to expanded use of natural gas in the electric power sector in the
future

. However, increased use of natural gas in the electric power sector also presents some potential challenges. Unlike other fossil fuels, natural gas cannot typically be stored on

- site and must be delivered
as it is consumed

. Because adequate natural gas infrastructure is a key component of electric system reliability in many regions, it is important to understand the implications of greater natural gas demand
for the infrastructure required to deliver natural gas to end users, including electric generators.
The purpose of this study is to understand the potential infrastructure needs of the U

. S

. interstate natural gas pipeline transmission system under several future natural gas demand scena rios. Specifically, three scenarios were developed : a reference scenario and two scenarios with increased electric sector natural gas demand. Both increased demand scenarios

— an Intermediate Demand Case and a High
Demand C ase
— are based on a simple, illustra tive national carbon policy applied to the electric power sector (not based on any real or proposed policy) that drives increased electric sector natural gas use.

T he Intermediate and High Demand C ases differ only in their underlying assumptions about coal

- fired power plant retirements. In particular, the High Demand Case, which assumes greater coal

- fired power plant retirements, is intended to be an upper

- bound test case on natural gas consumption in the electric
power sector. 1

To perform this analysis , the U.S. Department of Ener gy commissioned Deloitte MarketP oint to examine
these scenarios in its North American Integrated Model (NAIM), which simultaneously models the
electric power and the natural gas sectors.

1 For a more detailed description of the scenarios considered in this analysis , see Section 2 .3 Description of Scenarios

.

### Natural Gas Infrastructure Implications o f Increased Demand from the Electric Power Sector

Page vi U.S. Department of Energy The key findings of this analysis ar e the following :
Key Finding 1 : Diverse sources of natural gas supply and demand will reduce the need for additional
interstate natural gas pipeline infrastructure. T he combination of a geographic shift in r egional natural gas production

— largely due to the expanded production of na tural gas from shale formations

— and growth in natural gas demand is projected to require expanded natural gas pipeline capacity. H owever, the rate of pipeline capacity expansion in the scenarios considered by this analysis is lower than the
historical rate of natural gas pipeline capacity expansion. P ipeline capacity additions in the cases considered here are projected to be 38

– 42 billion cubic feet per day ( Bcf/d ) between 2015 and 2030. In comparison, between 1998 and 2013
, nearly 127 Bcf/d of pipeline capacity was added in the U nited
S tates

. Because projected natural gas production and demand are geographically diverse
, the need for
additional interstate natural gas pipeline infrastructure is lower than would be expected i f the increased production or demand were concentrated in a particular region. Furthermore, recent pipeline capacity
additions that were placed in service between 2007 and the present in order to realign the U.S. natural gas transmission system with changing supply and demand conditions driven by increases in shale gas production are likely to reduce the need for future pipeline infrastructure

. Key Finding 2 : Higher utilization of existing interstate natural gas pipeline infrastructure will reduce
the need for new pipeline s
. The U.S. pipeline system is not fully utilized because flow patterns have evolved with changes in supply and demand

. I ncreased demand for natural gas in the scenarios considered by this analysis does not lead to larger increases in pipeline capacity because , in some regions
, available existing pipeline capacity is projected to be used before expanding existing pipelines

or building new capacity

. Given the cost of building new pipelines, finding alternative routes that utilize
available existing pipeline capacity is often less costly than expanding pipeline capacity. While

s easonality of demand requires pipelines to accommodate peak natural gas demand
, the incremental
demand from new base load natural gas generation in the scenarios considered in this analysis tends to
be relatively uniform across the year

. It is easier to accommodate this relatively uniform incremental natural gas demand on existing pip elines than it would be to accommodate demand that coincide s more strongly with peak demand.

Key Finding 3 : Incremental interstate n atural gas pipeline infrastructure needs in a future with a n illustrative national carbon policy are projected to be modest relative to the Reference Case

. While a
f uture carbon policy may significantly increase natural gas demand from the electric power sector, the projected incremen tal increase in natural gas pip eline capacity additions is modest relative to the
Reference Ca se. In the Intermediate Demand Case, an incremental 1.4 Bcf/d (about 4% of total Reference Case capacity additions of 38 Bcf/d) of additional pipeline capacity above Reference Case levels is projected to be built. Similarly, in the High Demand Case, an inc remental 3.9 Bcf/d (10% of total Reference Case capacity additions of 38 Bcf/d ) of additional pipeline capacity above Reference Case levels is projected to be built . These relatively modest incremental additions follow from the system
characteristics descr ibed previously and from the pipeline infrastructure attributes of the sources of
incremental natural gas supply across the cases

.

### Natural Gas Infrastructure Implications of Increased Demand from the Electric Power Sector

U.S. Department of Energy Page vii Key Finding 4 : While there are constraints to siting new interstate natural gas pipeline infrastructure , the projected pipeline capacity additions in this study are lower than past additions that have
accommodated such constraints. Siting energy infrastructure in the U nited S tates is a complex, multi

jurisdictional , and multidimensional process , with no two projects facing the same set of issues

. While these barriers present potential challenges to expanding U.S. natural gas infrastructure

, the Federal Energy Regulatory Commission (FERC) has authorities to facilitate siting of natural gas pipeline
infrastructure. Similarly, w hile there are a number of institutional and other barriers to siting infrastructure and coordinating the natural gas and electric systems, there are multiple processes underway to address these issues . I n addition, the projected pipeline capacity additions in this study (ranging from 38 to 42 Bcf/d across the cases from 2015 to 2030) are lower than past addition s ( 127 Bcf/d of pipeline capacity was added from 1998 to 2013) that have accommodated siting constraints

. H owever, if siting energy infrastructure becomes more or less challenging in the future, the level of effort needed to site the pipeline capacity additions projected in this analysis could increase or decrease

.

### Natural Gas Infrastructure Implications of Increased Demand from the Electric Power Sector

U.S. Department of Energy Page 1 

## 1. Introduction

1 .1 Purpose of T

his S tudy Over the past decade, natural gas production in the United States has undergone a revolution. The combination of hydraulic fracturing and horizontal drilling technology has allowed economic access to enormous quantities of natural gas from shale formations. As a result, in 2013, the United States became the world’s largest producer of hydrocarbons. 2 This development has had and will likely continue to have significant consequences for the broader economy. The impact of abundant, low

- cost natural gas is particularly important in the electric power sector. During the month of April 2012, electricity g eneration from n atural gas

- fired plants virtually matched generation from coal

- fired plants

. 3 While coal has regained some of its market share because of gradually rising natural gas prices, growth in natural gas generation is projected to continue in the future. 4

Increased use of natural gas in electric generation presents some potential challenges. While coal can typically be stored on

- site at power plants, natural gas must be delivered as it is used. 5 Because adequate natural gas infrastructure is a key component of electric system reliability in many regions, it is important to understand the implications of greater natural gas demand for the infrastructure required to deliver natural gas to end users, including electric generators.

The United States has more than 217,000 miles of interstate natural gas pipelines to deliver natural gas from producing regions to end users. 6 However, the continued development of natural gas from shale formations, which tend to be situated outside of traditional natural gas producing regions, will require

new pipeline infrastructure and/ or the repurposing of existing infrastructure.

The purpos e of this study is to understand the potential infrastructure needs of the natural gas pipeline system under several future natural gas demand scenarios. Specifically, three scenarios were developed : a reference scenario and two scenarios with increased el ectric sector natural gas demand. Both
increased demand scenarios

— an Intermediate Demand Case and a High Demand C ase
— apply a simple,
illustrative carbon policy to the U.S. electric power sector (not based on any real or proposed policy)
that drives increas ed electric sector natural gas use

. These cases differ only in their underlying

2 U.S. Energy Information Administration, “Total Oil Supply (Thousand Barrels Per Day),” International Energy Statistics, http://www.eia.gov/cfapps/ipdbproject/IEDIndex3.cfm?tid=5&pid=53&aid=1 ; U.S. Energy Information Administration, “Dry Natural Gas Production (Billion Cubic Feet),” Internat ional Energy Statistics, accessed September 24, 2014, http://www.eia.gov/cfapps/ipdbproject/IEDIndex3.cfm?tid=3&pid=26&aid=1

. 3 U.S. Energy Information Administration, “ Net generation for United States, monthly,” Electricity Data Browser, accessed September 24, 2014, ht tp://www.eia.gov/electricity/data/browser/#/topic/0?agg=0,1,2&fuel=pe&geo=g&sec=g&freq=M&start=200701&end=20120 4&charted=3

- 5

- 7

- 9

- 11

. 4 U.S. Energy Information Administration, “Table 8. Electricity Supply, Disposition, Prices, and Emissions,” Annual Energy Outlook 2014 , May 7, 2014, accessed September 24, 2014, http://www.eia.gov/forecasts/aeo/excel/aeotab_8.xlsx

. 5 Some natural gas power plants also have the ability to operate on alterna tives to pipeline

- delivered natural gas, such as fuel oil and local stores of liquefied natural gas (LNG) or liquefied petroleum gas (LPG). In addition, note that p otential deliverability challenges for coal have also been documented . For example, see: U.S . Energy Information Administration, “Coal stockpiles at coal

- fired power plants smaller than in recent years,” Today in Energy, November 6, 2014, accessed November 12, 2014, http://www.e ia.gov/todayinenergy/detail.cfm?id=18711

. 6 U.S. Energy Information Administration, “Estimated Natural Gas Pipeline Mileage in the Lower 48 States, Close of 2008,” accessed October 23, 2014, http://www.eia.gov/pub/oil_gas/natural_gas/analysis_publications/ngpipeline/mileage.html

.

### Natural Gas Infrastructure Implications o f Increased Demand from the Electric Power Sector

Page 2 U.S. Department of Energy assumptions about coal

- fired power plant retirements. In particular, the High Demand Case, which assumes greater coal

- fired power plant retirements, is intended to be an upper

- bound test case on natural gas consumptio n in the electric power sector.



### 1

. 2 Recent Developments in the U

. S

. Natural Gas Sector
The U nited S tates has an extensive natural gas infrastructure that efficiently produces, stores, and transports natural gas from producing fields to end users . The U nited S tates is the largest consumer of natural gas in the world, and with the recent growth in shale gas production, the U nited S tates is also

now the w orld’s largest natural gas producer. 7 As shown in Figure 1
, pipelines originate in supply regions and transport natural ga s to major market regions as well as to smaller markets throughout the country

. While most pipelines are relatively short ( several hundred miles or less ), some major transmission pipelines stretch over a thousand miles. For example, the Transcontinental (Transco) p ipeline, connecting Texas and L ouisiana supplies to Mid

- Atlantic mark ets, and the Rockies Express (REX) p ipeline, connecting Colorado and Wyoming supplies to Ohio and e astern markets , are both about 1,700 miles long.

Figure 1 : U

. S

. Natural Gas Pipeline System 8

Because pipelines are not moved once they are built , new pipelines or modifications to existing pipeline s are required when production in a supply basin grows and reaches pipeline takeaway capacity
constraints out of the region
, or when demand in a market area grows to exceed the pipeline system

7 U.S. Energy Information Administration, “Dry Natural Gas Production (Billion Cubic Feet),” International Energy Statistics, accessed September 24, 2014, http://www.eia.gov/cfapps/ipdbproject/IEDIndex3.cfm?tid=3&pid=26&aid=1

. 8 U.S. Energy Information Administ ration, Office of Oil & Gas, Natural Gas Division, Gas Transportation Information System.

### Natural Gas Infrastructure Implications of Increased Demand from the Electric Power Sector

U.S. Department of Energy Page 3 capacity to deliver into the region. For example, during the previous decade, rapid growth in Rockies
natural gas production gave rise to the REX pipeline
, which transports natural gas produced in the region
to markets in the East . Similarly, rapid natural gas demand growth in Florida prompted construction of the Gulfstream pipeline and numerous expansions of the Florida Gas Transmission pipeline so that
natural gas produced in the Gulf region could be deliver ed to consumers in Florida

. The most prolific shale gas basin in the U nited S tates is the Marcellus, with the prime fields located in Pennsylvania and West Virginia. The growth in Marcellus shale gas production has had a major impact
on the flow of natura l gas throughout the United States . Natural gas that was once imported from other
states into e astern markets has been increasingly displaced by Marcellus production. While p ipeline capacity connecting Marcellus producing fields to either natural gas markets or interconnections to existing pipelines has been added, some natural gas production has yet to be connected
, because pipeline takeaway capacity is still limited

.



### 1 .3 Eco nomics of Natural Gas Transmission New natural gas pipeline development is driven by market supply and demand, which expresses itself in the form of basis differential, or the difference in natural gas prices between two locations or “hubs.”

B asis differen tials provide an incentive for prospective pipeline shippers (the party that wants to transport natural gas) t o request that a pipeline company (the party that develops and/or owns the pipeline, often referred to as the “operator”) construct new pipeline c apacity and enter into long

- term

contracts for firm pipeline transportation service sufficient to enable the pipeline operator to proceed with the project. 9 Effectively, such an agreement enables the operator to have confidence that a significant share of the project’s development, construction, financing

, and operating costs will be recoverable from shipper s . Once a new natural gas pipeline is constructed, the shipper can rely on its contract for firm transportation service to capture the resulting basis d ifferential. 10 Basis differentials, and how the captured revenues compare to the cost of constructing pipelines , largely determine how much and in which locations pipeline capacity is likely to be added. 11

9 Shippers may be gas marketers or other entities, such as local distribution companies that contract for transportation servic e in order to gain access to supply to serve retail customers. Also, pipeline operators typically do not own upstream natural gas assets but instead generate revenue by offering pipeline capacity to shippers. In 1992, the Federal Energy Regulatory Commission issued Order Number 636, “Restructur ing of Interstate Natural Gas Pipeline Services (Final Rule).” Order Number 636 fundamentally altered the manner in which pipeline operators conducted business by requiring pipeline companies to sell natural gas transportation, storage, and other services separately (often referred to as “unbundling”), and enabled all participants in the U.S. natural gas market to buy, sell, or trade natural gas with any other market participant. For more de tails,

see http://www.ferc.gov/legal/maj

- ord

- reg/land

- docs/restruct.asp

. Note also that n atural gas may be contracted on a firm, or uninterruptible, basis. Firm transportation service is backed by an agreement that typically binds both parties to the agreement to either deliver or receive the quantity of natural gas specified in the agreement. Firm service has priority over interrupt ible service and cannot be curtailed during periods of high demand.
10 Note also that while requests for firm transportation service by shippers effectively drive new pipeline expansion, these shippers may make available transportation service to others in the secondary or resale markets once the pipeline is fully
constructe d and operating.

11 Changes in other sectors, such as electricity, may further change the supply and demand conditions within natural gas markets. These changes may, in turn, affect basis differentials and the resulting incentives for natural gas pipeline infrastructure development.

### Natural Gas Infrastructure Implications o f Increased Demand from the Electric Power Sector

Page 4 U.S. Department of Energy The cost of constructing pipelines can be significa nt. For example, the 1,698

- mile

- long REX pipeline, which has a capacity of 1.8 billion cubic feet per day ( Bcf/d ) , cost approximately $5 billion to construct. 12 In order for the economics of the pipeline to be favorable, the natural gas flowing through the pipeline must generate sufficient revenue over its operating lifetime to justify the upfront capital investment.
Revenue and/or cost recovery for pipeline shippers depends on the demand for natural gas, which is highly seasonal, particularly in the East. M oreover, pipeline shippers sometimes capture high value for short durations, often during peak periods, when increased demand, coupled with transmission constraints, causes basis differentials to rise. For example, the “polar vortex

, ” which occurred during the
winter of 2013

– 20 14 and plunged the Mid

- Atlantic, Northeast, and Southeast into a deep freeze, highlights how pipeline transmission constraints can cause price spikes in transmission

- constrained markets. In fact, even during normal years in regions se rved by limited pipeline capacity, significant transmission constraints can last for weeks. However, while price spikes and temporary transmission constraints associated with extreme weather events can have significant impacts on natural gas

consumers, a p rice spike may or may not provide sufficient revenue to justify additional infrastructure
investment.



### 1 .4 Institutional Considerations Siting energy infrastructure in the United States is a complex, multi

- jurisdictional , and multidimensional

process , with no two projects facing the same set of issues

. While these barriers present potential challenges to expanding U.S. natural gas infrastructure, the Federal Energy Regulatory Commission (FERC) has authorities to facilitate siting of natural gas pipeline inf rastructure

. Specifically, u nder the Natural Gas Act (NGA), FERC has authority to regulate the interstate transmission and certain sale s for resale of natural gas. 13 Central to resolving siting and cost allocation issues, FERC also possesses
authorit y to gr ant the right of eminent domain for the construction of pipelines , and u nder Section 7 of
the NGA, FERC can issue a certifi cate of public convenience and necessity to allow pipeline operators to

recover expenses associated with pipeline construction and op eration

. The combination of technical change, fundamental economic drivers, and related institutional considerations explain the history of pipeline capacity additions in the U nited States

. Figure 2 depicts total U.S. pipeline capacity additions and construction expenditures by year in which pipelines were or are expected to be placed in service. 14 There has been significant investment in new interstate pipeline capacity over the last 18 years for which data are available, with more than 133 Bcf/d of capacity
additions and $65 billion in capital expenditures . The pipeline expenditures in Figure 2 do not follow a smooth path over time ; major projects, such as the REX pipeline, which placed sections of the pipeline into service in 2008 and 2009, result in total expenditures for a particular year that exc eed the long

- run

12 Scott Parker, “Natural Gas Pipelines,” Kinder Morgan Energy Partners, L.P., accessed September 24, 2014, http://www.kindermorgan.com/content/docs/2008_Analysts_Conf_02_Natural_Gas_Pipelines.pdf

. 13 U.S. Energy Information Administration, “Natural Gas Act of 1938,” accessed September 24, 2014, http://www.eia.doe.gov/oil_gas/natural_gas/analysis_publications/ngmajorleg/ngact1938.html

. 14 The data in Figure 2 reflect both the capacity and cost associated with constructing new pipelines as well as adding capacity to existing pipelines. In addition, the data account for the capacity and co st associated with reversing flows in existing pipelines.

### Natural Gas Infrastructure Implications of Increased Demand from the Electric Power Sector

U.S. Department of Energy Page 5 average. Recent growth in natural gas production from shale formations has spurred new growth in pipeline construction because many large shale deposits are located outside of regions with a history of natural gas production and therefore lack the associated infrastructure. As such, the majority of expenditures for pipelines placed in service from 2010 through 2013 we re for projects designed to
transport shale gas

.

Figure 2 : Interstate Pipeline Capacity Additions and Capital Expenditures by Year in Service 15

15 U.S. Energy Information Administration, “U.S. natural gas pipeline projects,” July 1, 2014, accessed September 24, 2014, http://www.eia.gov/naturalgas/pipelines/EIA

- NaturalGasPipelineProjects.xls . Years 2014

– 2016 are additions reported as planned.

### Natural Gas Infrastructure Implications of Increased Demand from the Electric Power Sector

U.S. Department of Energy Page 7 

## 2. Model Description , Limitations, and Scenarios

2 .1 Model Description This study uses the Deloitte MarketPoint North American Integrated Model ( NAIM ) to analyze the
interaction between electric power and natural gas markets in North America. 16 NAIM includes detailed and comprehensive electricity and natural gas market models

. Each sector al model include s disaggregated representations of supply, infrastructure, and demand by geographic region within North
America. These two sectoral models are then integrated both geographically and temporally to produce a comprehensive and self

- consistent set of results across both markets

.
NAIM applies microeconomic theory to solve for market

- clearing prices and qu antities simultaneously across multiple markets , multiple commodities
, and multiple time steps

. It performs fundamental market analysis of supply and demand within each region and their dynamic interactions. The model uses monthly time steps over a 30

- year time horizon , but the electricity model further disaggregates the monthly time steps to more accurately represent load duration curves in each region

. On the natural gas side of NAIM

, the model represents natural gas producer decisions regarding the
timi ng and quantity of reserves to add
, given producers ’ resource endowments , the cost to bring production online, and anticipated forward prices . W ithin the model
, there are about 40 natural gas supply regions in the United States. The model uses depletable resource economics to compute a resource production schedule that maximizes profit

, given endogenously projected wellhead prices

. Under this approach
, today’s drilling affects tomorrow’s natural gas price s and , conversely, expectations
about tom orrow’s natural gas price s affect today’s drilling.

NAIM also represents the existing interstate pipeline system by pipeline segment . The model builds additional pipeline capacity when it is economic
, given the computed supply

- demand dynamics as well

as infras tructure constraints and costs. Specifically, the model builds pipeline capacity if the basis
differential across a new pipeline would be large enough to cover pipeline variable costs and recovery of upfront capital costs for expansion, while provid i ng a sufficient rate of return. That is, t he volume of natural gas flows over time must deliver sufficient after

- tax margins to justify the cost of expansion.
The model input that determines the cost of expansion is the overnight capital cost. 17 E stimates of capital cost are derived from the cos t of actual pipeline projects. For example, a 1 Bcf/d pipeline expansion that costs $500 million would have a capital cost of $1.37 per million cubic feet (Mcf) of

16 For more details on the Deloitte MarketPoint North American Integrated Model, see: Deloitte MarketPoint, Deloitte MarketPoint , 2011, http://www.deloitte.com/assets/Dcom

UnitedStates/Local%20Assets/Documents/us_er_marketpoint_marketbuilder011411.PDF

. The results are solely for informational pur poses and are not intended to be predictions of events or future outcomes. Deloitte MarketPoint is not, by means of this publication, rendering accounting, business, financial, investment, legal, tax, or other professional advice or services to any person. Deloitte MarketPoint shall not be responsible for any loss sustained by any person who uses or relies on this publication.

17 The overnight capital cost is the cost at which a unit could be constructed, assuming that the entire process from planning through completion could be accomplished in a single day. It does not include related financing costs (cost of capital) and d oes

no t reflect potential changes in cost over the actual period during which the capacity would be constructed.

### Natural Gas Infrastructure Implications o f Increased Demand from the Electric Power Sector

Page 8 U.S. Department of Energy annual transmission capacity. The cost of e ach addit ional Mcf of expansion for a specific pipeline
segment is assumed to be constant in the model

. 18

To represent natural gas demand for the residential, commercial and industrial sectors, t he model applies growth rates by sector and region derived from the U. S. Energy Information Administration’s ( EIA’s ) Annual Energy Outlook 2014 (AEO 2014) Reference Case to historical state

- level demand data

. Demand for natural gas from these sectors is assumed to be responsive to changes in natural gas prices
over time. D emand for natural gas from the electric power sector is determined endogenously by NAIM, which computes fuel use based on competition between different types of power generation.
More specifically, o n the electricity side of NAIM

, the model contains a repr esentation of the North American electricity system
, including electric generation assets, bulk transmission between regions
, and load patterns

. NAIM projects price s, generation mix
, associated fuel use , and environmental
emissions for North American power market s

. The geographic scope encompasses all areas under the jurisdiction of the North American Electric Reliability Corporation ( NERC ) , which includes portions of
Canada and Northern Baja Mexico, as well as all of the lower 48 United States. 19 Within NAI M there are
a total of 76 electricity balancing regions

. Electric g enerating capacity additions are largely endogenous, with some planned and other capacity
additions specified exogenously , while all capacity retirements are specified exogenously. NAIM us es technology cost and performance assumptions similar to those assumed in EIA’s AEO 2014 Reference
Case. E lectric transmission capacity additions are specified exogenously , and NAIM’s total electric load projection is based on the AEO 2014 Reference Case. 20

Finally, the representation of inter

- commodity linkages allows the model to project how a n illustrative
national carbon policy might affect each regional electricity market
, which in turn affects the natural gas
market

. I ntegrating the markets for natural gas and electricity with in the model is important because
future U.S. natural gas demand growth is projected to be largely driven by the electric power sector.



### 2 .2 Modeling Limitations
This analysis assumes rational economic behavio r with perfect foresight , but a variety of barriers may lead to outcomes that differ from those projected by this analysis. Real

- world m arkets may overbuild or underbuild infrastructure in anticipation of future demand and prices. For example, by 2006, FERC had
received 43 applications to construct new U

. S

. liquefied natural gas ( LNG ) import terminals
, and a total
of 11 facilities were ultimately built in anticipation of a large increase in LNG imports that never

18 The model also accounts for the costs associated with adding capacity to existing pipelines through expansions and looping (adding a new pipeline r unning parallel to an existing pipeline). In addition, the model accounts for the costs associated with reversing flows in existing pipelines. For example, in June 2014, a portion of the Rockies Express Pipeline, which was origin ally constructed to bring n atural gas from the Rocky Mountain region to eastern markets, was reconfigured to allow natural gas produced in the Marcellus and Utica shale basins to be transported to midwestern markets. See U.S. Energy Information Administration, “First westbound natur al gas flows begin on Rockies Express Pipeline,” Today in Energy, June 18, 2014, accessed October 22, 2014, http://www.eia.gov/todayinenergy/detail.cfm?id=16751

. 19 For details, see Appendix A. 1 Map of Electric Power Sector Natural Gas Demand Regions

. 20 U.S. Energy Information Administration, “Market Trends: Electricity demand,” Annual Energy Outlook 2014 , May 7, 2014, accessed October 1, 2014, http://www.eia.gov/forecasts/aeo/MT_electric.cfm . Total electric generation in NAIM is
, on average , approximately 0.8% lower than AEO 2014 Reference Case levels over the projection period

.

### Natural Gas Infrastructure Implications of Increased Demand from the Electric Power Sector

U.S. Department of Energy Page 9 materialized. 21 The approach taken in this study does not try to anticipate suboptimal actions. While
real

- world markets do not always perfectly align supply and demand
, it is difficult to determine a credible way to anticipat e potential future market disequilibrium.

In addition, i nterstate pipeline capacity additions in the model are presumed to use the most efficient routing
, regardless of ownership. Full access to pipeline segments is assumed for both the utilization of existing capacity and future capacity additions. As such, th e model is limited in its ability to account for the potential cost of barriers facing many interstate natural gas pipeline projects , including siting and permitting challenges as well as cost allocation and cost recovery issues. 22

As discussed later in thi s report , the amount of new interstate natural gas pipeline capacity projected in the scenarios considered in this analysis between 2015 and 2030 ( 3 8

– 42 B c f/d) is considerably lower than the amount of new capacity added for the historical period between 19 98 and 2013 ( 127 B c f/d).

Because this historical capacity was constructed in a market and regulatory environment prone to the siting, permitting, and cost r ecovery issues described previously , it is reasonable to conclude that a smaller amount of total capacity (such as that projected in the R eference C ase , I ntermediate Demand Case, and H igh D emand C ase ) could be constructed in the future in a similar market and regulatory
environment. However , if siting energy infrastructure becomes more or less challenging in the future, the level of effort needed to site the pipeline capacity additions projected in this analysis could increase
or decrease

. Moreover, in the near term, all three scenarios in this analysis project relatively modest interstate pipeline capacity additions ( 2.2

– 2.7 B c f/d annually between 2015 and 2020). Increased production from
sh ale and other geographically diverse sources of natural gas as well as geographic diversity in the sources of natural gas demand have significantly reduced the need for additional construction of interstate natural gas pipeline infrastructure. Projected near

- term pipeline capacity additions are smaller than the annual averag e addition s over the last five years for which data are available ( 8.8 B c f/d annually between 200 9 and 201 3 ) and also smaller than the average annual capacity additions reported

21 Bipartisan Policy Center, National Commission on Energy Policy, Siting Critical Energy Infrastructure: An Overview of Needs and Challenges , June 2006, 33, http://bipartisanpolicy.org/wp

content/uploads/sites/default/files/Siting%20Critical%20Energy%20Infrastructure_448851db 5fa7d.pdf ; Federal Energy Regulatory Commission, “Existing FERC Jurisdictional LNG Import/Export Terminals,” April 19, 2012, accessed October 23, 2014, http://www.ferc.gov/indu stries/gas/indus

- act/lng/exist

- term.asp

. 22 Independent system operators (ISOs), state governments, and FERC are actively working to improve natural gas system deliverability and reliability in organized electricity markets. Policy changes underway include modifications to ISO forward capacity market incentives to better align resource performance and flexibility, FERC’s proposed reforms to improve the coordination and scheduling of natural gas pipeline capacity with electricity markets, and a New England St ates Committee on Electricity (NESCOE, an organization comprising representatives appointed by six New England governors) proposal to expand natural gas pipeline capacity and electric transmission capacity in New England. Selected examples include: FERC, “ Coordination of the Scheduling Processes of Interstate Natural Gas Pipelines and Public Utilities,” Notice of Proposed Rulemaking, March 2 0, 2014, http://www.ferc.gov/whats

- new/com m

- meet/2014/032014/M

- 1.pdf ; NESCOE, “New England Governors’ Commitment to Regional Cooperation on Energy Infrastructure Issues,” December 6, 2013, http://nes coe.com/uploads/New_England_Governors_Statement

- Energy_12

- 5

- 13_final.pdf ; PJM Interconnection, “PJM Capacity Performance Updated Proposal,” October 7, 2014, http://pjm.com/~/media/documents/reports/20141007

- pjm

capacity

- performance

- proposal.ashx ; and ISO New England, “Potential Changes in the Forward Capacity Market (FMC) in New England,” October 20, 2014, http://www.iso

- ne.com/static

assets/documents/2014/11/03_fcm101_oct_2014_potential_fcm_changes.pdf

.

### Natural Gas Infrastructure Implications o f Increased Demand from the Electric Power Sector

Page 10 U.S. Department of Energy as planned for the years 2014

– 2016 by EIA ( 5.1 B c f /d annually ). 23 Taken togethe r, these comparisons suggest that the rate of near

- term and medium

- term pipeline capacity expansion projected by this analysis is consistent with the rate of both historical and planned capacity expansion.

P rojections in this study are also limited by the spatial and temporal resolution of the model. The monthly time resolution in the model may not identify interstate pipeline constraints that reflect peak demand days or shorter time intervals. Moreover, these projections will not capture most future
i ntra state pipeline capacity additions (as opposed to interstate pipeline capacity additions )

. Increased natural gas demand will likely also require new, smaller pipelines (known as laterals) to connect new electric power sector generation. Laterals are dif ficult to represent because they depend on the precise locations of any new electric generating capacity that is built. Similarly, the model represents the pipeline gathering system as part of an integrated natural gas gathering and processing system withi n each basin, so natural gas gathering pipeline additions are not explicitly modeled. However, these
limitations are not likely to affect the conclusions about interstate natural gas pipeline infrastructure.

Finally, t he model computes optimal natural gas storage dispatch based on projected monthly prices and storage operating parameters. The model does not endogenously determine future storage capacity, and s torage capacity is held constant in the model

. 24 This study also does not address how
greater natura l gas demand may affect the need for high

- deliverability storage, which becomes important at time scales shorter than the monthly time resolution of the model , and is often used by natural gas electric power generators . However, none of these assumptions i s likely to affect the
conclusions about interstate natural gas pipeline infrastructure. In fact, the lack of natural gas storage additions in this study could place more pressure on the natural gas transmission system than would be the case if storage exp ansion were explicitly represented , consistent with the intention to create an

upper

- bound test case.



### 2 .3 Description of Scenarios
In order to analyze the potential impact of increased demand from the electric power sector

, this report
examines three scenarios : a “Reference Case” with no national carbon policy , an “Intermediate Demand
Case” with a n illustrative national c arbon policy applied to the electric power sector , and a “High
Demand Case” with a n illustrative national carbon policy applied to th e electric power sector and
accelerated coal

- fired power plant retirements

. The cases are described in Figure 3

.

23 Planned projects include projects that have been publicly announced, projects that have applied for or have received FERC approval, and projects that are under construction.
24 Total U.S. natural gas underground storage capacity grew at an average annual r ate of 1.2% from 2008 to 2013. See: U.S. Energy Information Administration, “U.S. Total Underground Natural Gas Storage Capacity,” September 30, 2014, accessed October 9, 2014, http://www.eia.go v/dnav/ng/hist/n5290us2a.htm

.

### Natural Gas Infrastructure Implications of Increased Demand from the Electric Power Sector

U.S. Department of Energy Page 11 Case Name Case Description

1. Reference Case Reference C ase with no national carbon policy

2. Intermediate Demand Case Nationally u niform c arbon policy (illustrative) applied to the Reference Case

3. High Demand Case Nationally u niform c arbon policy (illustrative) applied to the Reference Case, with a ccelerated coal

- fired power plant retirements

Figure 3 : Cases Analyzed

The Reference C ase does not include a n illustrative national carbon policy , but it does include existing

state renewable energy portfolio standards as well as regional greenhouse gas emissions policies , such as the Regional Greenhouse Gas Initiative (RGGI) in the Northeast and Mid

- Atlantic and the California Global Warming Solutions Act (AB32). 25 In the Reference C a se , approximately 25 gigawatts ( GW ) of coal capacity are retired after 2014. These retirements have been publicly announced and are imposed exogenously in the model.

In the increased demand cases , a n illustrative carbon policy was applied nationally begin ning in the year

2020 at a price of about $ 32 (2012$) per metric ton of 

### CO 2 , increasing at a rate of 5% per year in real

terms . This pathway matches EIA’s AEO 2014 $25 Carbon Price side case from 2020 onwards

. This
illustrative national carbon policy is not intended to represent any actual or proposed policy , but i nstead
is used as a means to drive growth in electric power sector natural gas demand , and consequently in natural gas infrastructure

.
In the Intermediate Demand C ase , coal

- fired power plant retirements are assumed to follow the trajectory in the Reference C ase. In other words, no additional retirements beyond those already
announced occur. However, in such a policy scenario
, coal

- fired power plants for which no
announcements have been made t o date could in fact retire prior to 2030
, which in turn would require
additional generation from other sources

, including natural gas.
To analyze this
, a High Demand Case was also modeled. In this case
, all coal

- fired power plants that
lack ed scrubber

- ty pe emissions controls as of the first quarter of 2014 are assumed to retire in 2017

. This assumption results in an incremental reduction of 104 GW of coal

- fired capacity beyond the 25 GW of capacity that retires in the Reference and Intermediate Demand Cases. Just as some units that have
not yet publicly announced a decision to retire may in fact eventua lly retire, it is likely that some
uncontrolled units will be economic to retrofit and will continue to operate after 2017

.
T his analysis focuses specifically on the sensitivity of the interstate natural gas pipeline infrastructure to varying levels of electric power sector natural gas demand

. Additional scenarios would be needed to
characterize a broader range of possible natural gas futures. For example, future work might consider alternative natural gas supply assumptions (such as the size of the natu ral gas resource base or the rate of technology advances that affect drilling cost and/or drilling productivity) that could result in natural

25 Existing federal production tax credits and investment tax credits for renewable energy sources are assumed to be expired in all of the cases considered in this analysis.

### Natural Gas Infrastructure Implications o f Increased Demand from the Electric Power Sector

Page 12 U.S. Department of Energy gas supply that is higher or lower than Reference Case levels. Similarly, future work might consider
scenarios in which energy efficiency or conservation is significantly deployed to meet end

- user demand
,
or scenarios with alternative assumptions about future industrial or transportation natural gas demand

.

### Natural Gas Infrastructure Implications of Increased Demand from the Electric Power Sector

U.S. Department of Energy Page 13 

## 3. Model Results

3 .1 Natural Gas Demand

In t he Reference Case
, total U

. S

. natural gas demand is projected to grow steadily and reach about 76 Bcf/d by 2030 , a n 18 % increase from 2015 levels

. 26 Reference Case demand in 2030 is close to EIA’s AEO
2014 Reference Case level of approximately 80 Bcf/d

. 27 Figure 4 shows natural gas demand by sector in
the Reference C ase

.

Figure 4 : Reference Case Total U

. S

. Natural Gas Demand by Sector , 2015 t o 2030
One of the implications of increase d natural gas production from shale formations is that the U nited
S tates is now an attractive so urce of LNG for global buyers. The Reference Case projects about 5 .1 Bcf / d
of U.S. LNG exports by 2020

. 28 The volume of U.S. LNG exports in the model is determined by Deloitte
MarketPoint ’s World Gas Model, which computes the competitive ness of U.S. LNG exports in global markets based on projections of the domestic price of natural gas, the cost of building LNG liquefactio n terminals, the cost of transportation and liquefaction, and the price and demand for natural gas in foreign markets. 29 Given these conditions , t he model determines whether the capital investment would
be recovered

. T he model’s estimate of LNG export volum es is based purely on underlying economics

26 The model output presented in Figure 4 does not include natural gas used at the production site, volumes used in processing, pipeline use and losses, or natural gas exports.
27 U.S. Energy Information Administration, “Table 13. Natural Gas Supply, Disposition, and Prices,” Annual Energy Outlook 2014
, May 7, 2014, accessed September 24, 2014
, http://www.eia.gov/forecasts/aeo/excel/aeo tab_13.xlsx

. 28 For comparison, the U.S. Energy Information Administration’s Annual Energy Outlook 2014 projects 5.7 Bcf/d of LNG exports by 2020. See: U.S. Energy Information Administration, “Table 134. Natural Gas Imports and Exports,” Annual Energy Outlo ok 2014, May 7, 2014, accessed September 29, 2014, http://www.eia.gov/forecasts/aeo/supplement/suptab_134.xlsx

. 29 For more details on the Deloitte MarketPoint World Gas Model, see: Deloitte MarketPoint, Deloitte MarketPoint
, http://www.d eloitte.com/assets/Dcom

UnitedStates/Local%20Assets/Documents/us_er_marketpoint_marketbuilder011411.PDF

.

### Natural Gas Infrastructure Implications o f Increased Demand from the Electric Power Sector

Page 14 U.S. Department of Energy and does not capture purchase decisions of LNG consumers who are willing to pay above market prices in order to diversify their LNG acquisition portfolio s

. 30

In general, under a n illustrative national carbon policy , a shift away from more carbon

- intensive generation such as coal to lower

- carbon generation such as natural gas and to zero

- carbon options such
as nuclear
, renewables
, and energy efficiency would be expected . Because this study examines the impacts of a n illustrative national carbon policy on the natural gas pipeline system, this section will focus on the impact of these two scenarios on electric power sector natural gas demand

. See Appendix B.
Electric Power Sector Results f or additional electric power sector results.

Figure 5 compares electric power sector natural gas demand across the cases. In the Intermediate Demand Case, electric power sector natural gas demand increases by about 7.5 Bcf/d ( about 25% ) in
2030 relat ive to the Reference Case. In the High Demand Case, electric power sector natural gas demand increases by about 14 Bcf/d ( about 46% ) in 2030 relative to the Reference Case. 31

Figure 5 : E lectric Power S ector N atural G as D emand a cross the Cases , 2015 to 2030 Figure 6 shows electric power sector natural gas demand by region in the Reference Case (for a description of regions

, see Appendix A. 1 Map of Electric Power Sector Natural Gas Demand Regions ).

30 In order to test the sensitivity to alternative assumptions about U.S. LNG export volumes, an additional case was run with approximately 10 Bcf/d of LNG exports by 2022. The pipeline capacity additions projected in this case are not significantly different from those projected in the Reference Case.
31 These increases are equivalent to 10% and 18% , respectively, of total natural gas demand in 2030 in the Reference Case.

### Natural Gas Infrastructure Implications of Increased Demand from the Electric Power Sector

U.S. Department of Energy Page 15

Figure 6 : Reference Case Electric Power Sector Natural Gas Demand by Region, 2015 to 2030 The incremental change in electric power sector natural gas demand between the Intermediate Demand
Case and the Reference Case is shown in Figure 7

. Positive values are increases relative to the Reference Case, while negati ve values are decreases. The electric power sector natural gas demand results are consistent with the electric power sector generation results presented in Appendix B. Electric Power
Sector Results . Nearly all regions see an increase in electric power sector natural gas demand once the
illustrative national carbon policy is applied in 2020, as natural gas

- fired generation replaces gen eration
from coal

- fired units. However, regions in which coal

- fired generation is replaced with a greater amount of renewable power, such as MRO and SPP
, do not demand as much incremental natural gas as other regions.

Figure 7 : Intermediate Demand Case Electri c Power Sector Natural Gas Demand Relative to the Reference Case , 2015 to 2030

### Natural Gas Infrastructure Implications o f Increased Demand from the Electric Power Sector

Page 16 U.S. Department of Energy Figure 8 shows the change in electric power sector natural gas demand in the High Demand Case
relative to the Reference Case

. In this modeling framework, t he greater number of coal plant
retirements assumed in this scenario result s in greater natural gas

- fired generation and

, in turn
, greater natural gas demand in the electric power sector

. This increase in natural gas demand also begins earlier, reflecting the assumption about the timing of coal

- fire d power plant retirements.

In the WECC ( ex cluding CA ) region , power sector natural gas demand declines in the Intermediate
Demand Case ( Figure 7 ) but increases in the High Demand Case ( Figure 8 ) relative to the Reference Case

. In the Reference Case

, WECC (ex cluding CA) exports electricity to California. Howeve r , the application of
the illustrative national carbon policy in the Intermediate Demand Case increases the costs to operate fossil generation in the WECC ( ex cluding CA ) region

. In light of these higher costs, the WECC ( ex cluding
CA ) region export s less el ectricity to C alifornia , and fossil generation

— and
, in turn
, power sector natural gas demand

— in the WECC (ex cluding CA) region declines relative to the Reference Case ( Figure 7 )

. Natural gas power generation increases in California to replace decreasing imports of power from the WECC (excluding CA) region

. The greater number of coal

- fired power plant retirements ass umed in the High Demand C ase requires replacement energy to be made up by natural gas

- fired generation in the
WECC ( ex cluding CA ) region

. This effect works in the opposite direction as the prior one, result ing in greater WECC (ex cluding CA) power sector na tural gas demand in the High Demand C ase relative to the
Reference Case ( Figure 8 )

.

Figure 8 : High Demand Case Electric Power Sector Natural Gas Demand Relative to the Reference Case , 2015 to 2030

### Natural Gas Infrastructure Implications of Increased Demand from the Electric Power Sector

U.S. Department of Energy Page 17 3 .2 Natural Gas Supply Growing demand for natu ral gas leads to a significant increase in the supply of natural gas. In the
Reference Case

, t otal natural gas production is projected to grow by 3 7 % from 201 5 to 2030, increasing
from approximately 71 Bcf/d in 201 5 to nearly 98 Bcf/d in 2030 ( Figure 9 ). 32 Reference Case natural gas supply in 2030 is comparable to EIA’s AEO 2014 Reference Case level of approximately 94 Bcf/d. 33 T he
Reference Case projection a lso shows a continued increase in shale gas pr oduction over the projection period

. With the most significant contribution coming from the Marcellus basin, total U.S. shale gas production is projected to reach about 70 Bcf/d by 2030 and to become the domina nt source of U

. S

. natural gas supply (for a description of the production regions
, see Appendix A.2 Map of Lower 48 States Shale Plays )

.

Figure 9 : Reference Case Natural Gas Production by Production Region , 2015 to 2030 In response to the increased use of natural gas for power generation in the In termediate and High
Demand Cases , U

. S

. natural gas production is projected to increase by 6%

– 10% over Reference Case
levels in 2030

. The majority of production is projected to come from shale gas basins , as shown in Figure
10

. The remainder, totaling 38 % of total natural gas supply in both the Intermediate Demand Case and the High Demand Case
, includes conventional natural gas , offshore natural gas, associated gas

, coalbed methane, and tight gas

. 34 Just as in the Reference Case, s hale gas production in the Intermediate
Demand Case is spread across multiple regions . While the volumes of natural gas supplied are larger in the High Demand Case , the geographic distribution of that supply is similar.

32 In any given year, natural gas production is greater than natural gas demand plus net exports because of fuel used or lost in all stages of natural gas production, transmission, distribution, and storage.
33 U.S. Energy Information Ad ministration, “Table 13. Natural Gas Supply, Disposition, and Prices,” Annual Energy Outlook 2014
, May 7, 2014, accessed September 24, 2014, http://www.eia.gov/forecasts/aeo/excel/aeotab _13.xlsx

. 34 “Tight gas” is natural gas found in low

- permeability sandstones and carbonate reservoirs. The rock layers that hold the natural gas are very dense, preventing easy flow of natural gas.

### Natural Gas Infrastructure Implications o f Increased Demand from the Electric Power Sector

Page 18 U.S. Department of Energy Figure 10 : Share of Total Natural Gas Production f rom Different Production Basins across the Cases , 2015 to 2030 Interestingly, while the Marcellus region is the largest source of shale gas production in the Reference Case, it is not the largest incremental source, relative to the Reference Case, of projected future natural gas production in the Intermediate and High Demand Cases. Instead, the largest source of incremental shale gas producti on in these cases is the Haynesville basin, which is situated in East Texas and
Northwest Louisiana. This result follows from the underlying resource economics of the shale plays represented in the model. As the lowest

- cost Marcellus resources are depleted over the course of the
Reference Case projection, only higher

- cost Marcellus supplies remain available for incremental production in the increased demand cases. Incremental Marcellus production is also likely to require additional infrastructure to bring production to market, diminishing the attractiveness of Marcellus production relative to other basins. In addition, the Haynesville is well positioned to supply natural gas to southern electricity markets, which account for a significant share of the increase in demand from the U.S. electric power sector in the Intermediate and High Demand Cases ( Figure 7 and Figure 8 ).



### 3 .3 Natural Gas Prices The United States is estimated to hold about 2,400 trillion cubic feet ( Tcf ) of technically recoverable natural gas in shale formations, equivalent to approximately 100 years of supply at present levels of
demand. 35 The large shale gas resource potential has effectively made the long

- run natural gas supply curve more elastic, and as a result, long

- run natural gas demand changes are less likely to result in major price impacts.

35 U.S. Energy Information Administration, “Technically Recoverable Shale Oil and Shale Gas Resources: An Assessment of 137 Shale Formations in 41 Countries Outside the United States,” June 13, 2013, accessed September 24, 2014, http://www.eia.gov/analysis/studies/worldshalegas/

.

### Natural Gas Infrastructure Implications of Increased Demand from the Electric Power Sector

U.S. Department of Energy Page 19 I n the Refere nce Case , U

. S

. natural gas prices are among the lowest compar ed to other industrialized
countries throughout the forecast period

. Figure 11 shows historical prices through 2010 as well as the projected price at Henry Hub in the Reference Case

. 36 Advancements in the technology used to produce natural gas from shale formations, coup led with the global recession, caused natural gas prices to fall sharply from 2009 to 2012. In t he Reference Case

, natural gas prices slowly rebound and rise throughout
the projection period at levels that are sufficient to incentivize production from marg inal sources of natural gas supply. Henry Hub natural gas prices in the Reference Case are similar to prices in EIA’s AEO 2014 Reference Case. In 2030, Reference Case Henry Hub prices are projected to be $6.16/ million British thermal units ( MMBtu ) , while E IA’s AEO 2014 Reference Case prices are projected to be $6.03/MMBtu. 37

Figure 11 : Historical and Projected Henry Hub Natural Gas Prices in the Reference Case, 2000 to 2030 38

36 The projection begins in 2011 in order to calibrate the model.
37 U.S. Energy Information Administration, “Figure MT

- 40: Annual average Henry Hub spot natural gas p rices in the Reference case, 1990

– 2040,” Annual Energy Outlook 2014 , May 7, 2014, accessed September 25, 2014, http://www.eia.gov/forecasts/aeo/excel/figmt40_data.xls

. 38 Source for hi storical Henry Hub prices: U.S

. Energy Information Administration, “Henry Hub Natural Gas Spot Price,” September 17, 2014, accessed September 24, 2014, http://www.eia.gov/dnav/ng/hist/rngwhhdA.ht m

.

### Natural Gas Infrastructure Implications o f Increased Demand from the Electric Power Sector

Page 20 U.S. Department of Energy Figure 12 shows average price s from 2015 to 2030 across the cases for selected major regional natural gas markets and hubs. In the Intermediate Demand Case, growing demand for natural gas results in an average increase in Henry Hub prices of $0. 19 /MMBtu (or about 4 %) from 20 15 to 2030 relative to the
Reference Case . In the High Demand Case, the average increase in Henry Hub prices is about $0. 53 /MMBtu (or about 10 %) from 2015 to 2030 relative to the Reference Case

. The largest price impact in these cases is in Massachusetts, which is far downstream in regional pipeline flows

.

Figure 12 : Average Natural Gas Price s by Location across the Case s , 2015 to 2030



### 3 .4 Natural Gas Transmission

Reference Case
In the Reference Case

, the combination of a geographic shift in r egional natural gas production

— largely due to the expanded development of natural gas from shale formations

— and growth in natural gas demand is proj ected to require more interstate natural gas pipeline capacity.

Figure 13 shows the historical and planned capacity additions from 1996 to 2016

, along with the proje cted pipeline capacity additions between 2015 and 2030 in the Reference Case. P ipeline capacity
additions in the Reference Case are projected to be 38 Bcf/d between 2015 and 2030. In comparison,
between 1998 and 2013
, nearly 127 Bcf/d of pipeline capacity was added in the U nited S tates. Continued integration of shale gas production from the Marcellus basin, which is the largest producing basin in the Reference Case projection, is a key driver of future pipeline capacity additions in the Reference Case. Shale gas produced from the Marcellus is both lower in cost and situated geographically
closer to end

- user demand in the eastern United States. As a result, more than half of the 38 Bcf/d of interstate pipeline capacity additions in the Reference Case are associated with further integrating Marcellus natural gas production into U.S. natural gas markets.

Even with the significance of the Marcellus, projected natural gas production and demand are geographically diverse, so the need for additional interstate natural gas pipeline infrastructure is lower than would be

### Natural Gas Infrastructure Implications of Increased Demand from the Electric Power Sector

U.S. Department of Energy Page 21 expected if the increased production or demand were concentrated in a particular region. Furthermore, pipeline capacity additions that were placed in service between 2007 and the present in order to realign the U.S. natural gas transmission system with changing supply and demand conditions driven by increases in shale gas production are projected to reduce the need for future pipeline infrastructure.

Figure 13 : Historical , Planned , and Projected U.S. Interstate Pipeline Capacity Additions, 1996 to 2030 39

39 Source for historical and planned additions: U.S. Energy Information Administration, “Natural Gas Pipeline Projects from 1996 to Present,” July 7, 2014, accessed Septemb er 24, 2014, http://www.eia.gov/naturalgas/pipelines/EIA

NaturalGasPipelineProjects.xls

. The Deloitte MarketPoint projection for years 2015 through 2018 includes both planned and economic expansion.

### Natural Gas Infrastructure Implications o f Increased Demand from the Electric Power Sector

Page 22 U.S. Department of Energy Another reason that pipeline capacity additions in the Reference Case are not greater is that , in many regions, existing pipeline capacity is not fully utilized during many parts of the year

. Average capacity
utilization between 199 8 and 2013 was 5 4 %

. 40 For comparison, projected pipeline utilization for the top 200 pipeline segments by projected flow volume in the R eference Case in 2030 is 57%. 41 Given the cost of building new pipelines, finding alternative routes utilizing available capacity on existing pipelines is
often less costly than expanding pipeline capacity. 42 This response is more likely when incremental

nat ural gas demand does not strongly coincide with peak natural gas demand, which is true in the
Reference Case , because the incremental demand is largely driven by increases in base load natural gas generation in the electric power sector

. Figure 14 shows the regional distribution of projected pipeline capacity additions between 2015 and
2030 ( for more detail on the regions
, see Appendix A. 3 Map of Natural Gas Pipeline Expansion Regions )

. In the Marcellus, growth in natural gas production is projected to require additional e xpansion of pipeline take away capacity from the region. In total, a n estimated 8.4 Bcf/d of additional pipeline capacity will be needed to integrate Marcellus production with regional markets and interstate pipe lines (shown as “Within Marcellus” in Figure 14 )

. Growing Marcellus natural gas production is projected to
dominate the Mid

- Atlantic natural gas market . Not only will natural gas from the Marcellus displac e flows from other regions , but it will also be exported to other parts of the country

. A portion of the growth in Marcellus natural gas production is projected to serve n ortheastern markets and will require
3. 2 Bcf/d of incremental pipeline capacity (shown as “Mid

- Atlantic to North” in Figure 14 )

. 43

40 Calculation based on data from the following sources: U.S. Energy Information Administration, “U.S. State

- to

- State capacity,” January 16, 2014, accessed November 13, 2014, http://www.eia.gov/naturalgas/pipelines/EIA

- StatetoStateCapacity.xls ; U.S. Energy Information Administration, “International & Interstate Movements of Natural Gas by State,” October 31, 2014, accessed November 13, 2014, http://www.eia.gov/dnav/ng/ng_move_ist_a2dcu_nus_a.htm

. 41 This value represents annual average utilization for the top 200 segments in the model. Projected pipeline utilization in any given region or at any given time m ay be higher or lower than the average values reported here, depending on seasonal patterns of natural gas demand and regional natural gas system characteristics. In addition, annual pipeline utilization will be well below 100% for most pipelines because o f the seasonality of natural gas flows. A pipeline might operate near full capacity during peak seasons but will operate at much lower levels during off

- peak seasons.
42 As discussed in Section 1 .3 Eco nomics of Natural Gas Transmission , pipeline expansions are driven by basis differential, which means that new pipelines may be constructed even when existing capacity is available to perform the same trans portation service, provided that the anticipated revenue can justify the investment and operating costs.
43 The construction of a planned 1.7 Bcf/d expansion to the Transco Pipeline, which will serve markets in the Northeast, is exogenously specified to be in service in 2018 in the model.

### Natural Gas Infrastructure Implications of Increased Demand from the Electric Power Sector

U.S. Department of Energy Page 23

Figure 14 : Projected Interstate Pipeline Capacity Additions in the Reference Case, 2015 to 2030

G rowth in the Marcellus and in the Utica is also projected to reverse flows that historically ha ve come from west and south of the region. In the Reference Case , the m odel projects 4.4 Bcf/d will reverse flow
from Ohio to Indiana (included within the total for “ Mid

- Atlantic to W est ” in Figure 14 )

. Other expansions are projected to increase flows from Pennsylvania and West Virginia to Ohio, bringing total
Mid

- Atlantic to West expansion to 7.6 Bcf/d. F low reversal is also projected southward out of the
Marcellus to serve markets in the Southeast. Pipelines that currently bring natural gas from the Gulf region to the north are projected to reverse flow so that Marcellus production can serve the Virginia and
Carolinas markets ( included within the total for “Mid

- Atlantic to South” in Figure 14 )

. As a result of the projected expansions
, Virginia is almost completely served by Marcellus production. However, pipeline
reversal s do not go any f a rther south beyond the Carolinas because Gulf production is able to maintain
hold of southern markets.

In addition, Midcontinent , Rock ies
, and Gulf production , which is largely displaced from eastern markets, is increasingly transported to the Midwest and is projected to require 3.6 Bcf/d of capacity (shown as “Midcontinent, Rockies

, and Gulf to Midwest” in Figure 14 ). The greater quantity of natural gas from the Midcontinent, Rockies
, and Gulf region, as well as from the Marcellus and Utica , that serves m idwestern
markets , in turn, leads to a grea ter amount of natural gas that is available for export to Canada. As a result, e xport pipel ines from the Midwest to Canada are projected to expand by 2.2 Bcf/d (shown as “Exports to Canada” in Figure 14 ). 44 Finally, a s production increase s in the San Juan and Permian basins
,

44 The model assumes Canadian natural gas demand will grow to 5.5 Tcf (approximately 15 Bcf/d) by 2030, compared to 4.3 Tcf (about 12 Bcf/d) as estimated in the U.S. Energy Information Administration’s International Energy Outlook 2013 for the same period. Deloitte MarketPoint’s Canadian demand projections are in line with estimates from the Canadian National Energy Board. See: U.S. Energy Information Administration, “Table A6. World natural gas consumpt ion by region, Reference case, 2009

- 2040,” International Energy Outlook 2013 , July 25, 2013, accessed September 24, 2014, http://www.eia.gov/forecasts/archive/ieo13/excel/ieotab_ 6.xls ; Canadian National Energy Board, “Energy Demand: Reference

### Natural Gas Infrastructure Implications o f Increased Demand from the Electric Power Sector

Page 24 U.S. Department of Energy more pipeline capacity is projected to be added to allow natural gas produced in the Rockies and in the
Permian basin to increase its share of California and western market s (shown as “San Juan/Permian to
West” in Figure 14 )

.

Intermediate and High Demand Case s In the Intermediate Demand Case, electric power sector natural gas demand increases by 7.5 Bcf/d in 2030 compared to the R eference C ase

. This is a 25% in crease relative to Reference Case electric power

sector natural gas demand and a 10% increase relative to total Reference Case natural gas d emand. The impact on natural gas production is lower, at 6.1 Bcf/d (6%) over Reference Case levels in 2030. Higher
U .S. natural gas demand results in l ower U.S. pipeline exports to Canada
, which in turn reduce s the need for additional U.S. natural gas producti on. 45 Moreover , only a relatively modest 1.4 Bcf/d (about 4% of
the total Reference Case capacity additions of 38 Bcf/d) of additional pipeline capacity beyond Reference Case levels is projected to be built by 2030. As in the Reference Case

, because incremental natural gas production and demand are broadly distributed
, and because utilization of some existing pipelines can be increased, the need for additional natural gas infrastructure is reduced

. 46

In the High Demand Case, electric power sector natural gas demand is projected to increase by about 14 Bcf/d over Reference C a se levels in 2030 . This is a 46% increase relative to Reference Case electric power

sector natural gas demand and an 18% increase relative to total Reference Case natural gas d emand. This
increase in demand result s in a 10 Bcf/d (10%) increase in U.S. natural gas production relative to the
Reference Case in 2030

. Just as in the Intermediate Demand Case, reductions in natural gas pipeline exports account for the difference between natu ral gas production and demand. With the increase in natural gas demand in the High Demand Case, an incremental 3.9 Bcf/d ( approximately 10% of the total Reference Case capacity additions of 38 Bcf/d) of additional pipeline capacity above Reference Case levels is projected to be built by 2030

. Just as in the Reference and Int ermediate Demand Case s , the wide geographic distribution of both natural gas production and demand and the ability to increase utilization of some existing pipelines reduce the need for additional interstate natural gas pipeline infrastructure. Projected pipeline utilization for the top 200 pipeline segments by projected flow volume in the model in
2030 rises to 60% in the Intermediate Demand Case and 61% in the High Demand Case , compared to 57%
in the Reference Case.
Finally, t o further understa nd the reasons for the modest incremental infrastructure needs in the Intermediate and High Demand C ases, it is necessary to consider the incremental sources of supply in

Case

– Canada,” Canada's Energy Future 2013: Supply and Demand Projections to 2035 , November 11, 2013, accessed September 24, 2014, http://www.neb

- one.gc.ca/nrg/ntgrtd/ftr/2013/ppndcs/pxndsdmnd

- eng.html

. 45 In the Intermediate and High Demand Cases, U.S. LNG export levels are unchanged from the Reference Case level of 5.1 Bcf/d. In order to test the sensitiv ity to alternative assumptions about U.S. LNG export volumes, an additional case was run that coupled the High Demand Case assumptions with approximately 10 Bcf/d of LNG exports by 2022. The total pipeline capacity additions projected in this case are not significantly different from those projected in the High Demand Case.
46 Just as in the Reference Case, incremental demand in the increased demand cases largely follows from increases in natural
gas

- fired electric power generation primarily designed to ser ve base load electricity demand. As a result, incremental natural gas demand in these cases is relatively uniform over the course of a year, compared to total natural gas demand in the Reference Case, which exhibits a stronger seasonal pattern. It is easie r to accommodate this relatively uniform incremental natural gas demand on existing pipelines than it would be to accommodate demand that coincided more strongly with peak demand.

### Natural Gas Infrastructure Implications of Increased Demand from the Electric Power Sector

U.S. Department of Energy Page 25 these cases relative to the Reference Case. As discussed previously , while the Marcel lus is the largest source of shale gas production in the Reference Case, driving more than half of the total pipeline capacity additions in the Reference Case, the Haynesville basin is the largest source of incremental shale

gas supply in the Intermediate and High Demand Cases , relative to the Reference Case

. Compared to the Marcellus, increased production of shale gas in the Haynesville basin requires little or no additional
interstate pipeline capacity in order to access markets, because the region has a history of natural gas production and is already well served by interstate natural gas pipelines. However, even if the
incremental natural gas supply in the Intermediate or High Demand Cases were to come from another basin with a history of natural gas pro duction , the additional infrastructure requirements would be unlikely to affect the conclusions about infrastructure needs relative to historical experience.

Figure 15 , which compares the incremental regional pipeline capacity additions in the Intermediate and High Demand Cases to those in the Reference Case, demonstrates that the regional incremental capac ity
additions (and subtractions) are comparatively small
, relative to the level of capacity additions in the
Reference Case (shown in gra y)

. However, t here are some modest change s in regional capacity additions
between the cases

.

Figure 15 : Incremental Interstate Pipeline Capacity Additions in the Intermediate Demand (blue) and High Demand (red) Case s Compared to the Reference Case (gra y) , 2015 to 2030 47
In both increased demand cases, greater natural gas demand within the Mid

- Atlantic and southeastern regions results in regionally produced natural gas remaining within the region or being sent to

47 The gray bars are identical to Figure 14 , which shows Reference Case pipeline capacity additions between 2015 and 2030. The blue and red bars show the incremental changes in additions relative to the Reference Case over the same period in the Intermediate Demand and High Demand Cases, respectively. Total additions in these cases over the period can therefore be found by summing the gray and blue and gray and red bars, respectively.

### Natural Gas Infrastructure Implications o f Increased Demand from the Electric Power Sector

Page 26 U.S. Department of Energy southeastern markets (shown as “Within Marcellus” and “Mid

- A tlantic to South” in Figure 15 ). Furthermore, i n both increased demand cases , the demand for natural gas in midwestern markets (and the resulting tendency to send nat ural gas westward ) is lower than the demand in the Mid

- Atlantic (and the resulting tendency to use such supplies within the region )

, so the 7.6 Bcf/d of projected capacity expansions in the Reference Case (shown as “ Mid

- Atlantic to West ” in Figure 15 ) is reduced by 3.5 Bcf/d
in the Intermediate Demand Case and by 2.9 Bcf/d in the High Demand Case

. Given the increased demand for natural gas in the Southeast, the tendency to send natural gas northward to m idwestern
markets is lower than the tendency to use Gulf production in the Southeast, so f ewer pipeline capacity expansions are projected into the Midwest from the Gulf in the Intermediate a nd High Demand Cases
than in the Reference Case (shown as “Midcontinent, Rockies

, and Gulf to Midwest” in Figure 15 ).

In both increased demand cases, m ore pipeline capacity additions are projected relative to Reference
Case levels with in the West as well as westward from the San Juan and Permian basins to meet growing demand for natural gas in California and western markets (shown as “Within Western Stat es” and “San Juan/Permian to West” in Figure 15 ). While t here are no t any coal

- fired power plants to displace in California, natural gas demand increas es because of reduced imports of electricity and the resulting higher utilization of in

- state natural gas

- fired power plants.

Finally, c ompared to the Reference Case

, which projects 2.2 Bcf/d of pipeline capacity additions to
support U.S. exports to Canada , the Intermediate Demand Case projects 0.5 Bcf/d fewer capacity
additions
, while the High Demand Case projects 1.0 Bcf/d fewer capacity add i tions (shown as “Exports
to Canada” in Figure 15 ). These reductions in export volumes follow from the increasing demand for natural gas in the United States relative to Canada, driven by the growing demand from the U.S. electric
power sector.



### 3 .5 Expenditures on Natural Gas Transmi ssion Infrastructure

T he projected capital expenditures required to construct , expand, and modif y interstate pipeline
infrastructure described in the pre vious section are shown in Figure 16

. Total capital expenditures on pipeline capacity expansion in the Reference Case are projected to be about $ 42 billion between 2015
and 2030. In comparison, between 1998 and 2013
, pipeline ca pacity expenditures totaled more than $63 billion. 48 In the Intermediate Demand Case, the incremental capital expenditures are projected to be about $0.6 billion

, 1.3% higher than the Reference Case , and i n the High Demand Case
, the incremental capital expenditures are projected to be about $2. 8 billion
, 6. 5 % higher than the Reference Case

. 49

48 While projected costs are lower than historical costs (over a similar time period), the difference in expenditures is not as large as the difference in pipeline capacity additions between history and the model projection. The distance associated with the pipeline capacity additions in the model projection is comparable to (but lower than) the distance associated with historical pipeline capacity additions. Because project costs reflect, in part, the distance associated with new pipelines, the projecte d
exp enditures are closer to (but still lower than) historical expenditures.
49 As noted previously, the model does not include the cost of expanding natural gas gathering and processing systems. As such, the projected capacity expansions are limited to the gran ularity of the pipeline system representation in the model. Because demand is mostly represented at the state level, intrastate pipeline capacity is only partially represented in the model.

### Natural Gas Infrastructure Implications of Increased Demand from the Electric Power Sector

U.S. Department of Energy Page 27 Figure 16 : Histor ical , Planned , and Projected Capital Expenditures o n U.S. Interstate Pipeline Capacity , 1996 to 2030 50

50 Source for historical and planned additions: U.S. Energy Informa tion Administration, “Natural Gas Pipeline Projects from 1996 to Present,” July 7, 2014, accessed September 24, 2014

, http://www.eia.gov/naturalgas/pipelines/EIA

Nat uralGasPipelineProjects.xls . T he Deloitte MarketPoint projection for years 2015 through 2018 includes both planned and economic expansion.

### Natural Gas Infrastructure Implications o f Increased Demand from the Electric Power Sector

Page 28 U.S. Department of Energy Figure 17 : Projected Capital Expenditures on U.S. Interstate Pipeline Capacity in the Reference Case , 2015 to 2030

P rojected regional pipeline capital expendi tures are displayed in Figure 17

. T he largest interstate pipeline capital expenditures in the Reference Case are projected to be in the Marcellus to construct pipeline takeaway capacity . In the Intermediate and High Demand Case s ( Figure 18 )

, expenditures to expand Marcellus takeaway capacity and to transport natural gas southward increase relative to the Reference Case. Furthermore, in these ca ses, e xpenditures to transport Marcellus production westward and Midcontinent, Rockies
, and Gulf production northward decline relative to the Reference Case, consistent with the changes in pipeline capacity additions between the cases ( Figure 15 ) . Finally, i n both

cases , expenditures to bring Rockies and s outhwestern natural gas into and around California increase compared to Reference Case levels ( s hown as “Within West ern States ” and “San Juan/Permian to West”
in Figure 18 ) , also consistent with the changes in pipeline capacity additions between the cases

.

### Natural Gas Infrastructure Implications of Increased Demand from the Electric Power Sector

U.S. Department of Energy Page 29 Figure 18 : Incremental Projected Pipeline Capital Expenditures in the Intermediate Demand (blue) and High Demand (red) Case s Compared to the Reference Case (gra y) , 2015 to 2030 51

51 The gray bars are identical to Figure 17 , which shows Reference Case pipeline capital expenditures between 2015 and 2030. The blue and red bars show the incremental changes in expenditures relative to the Reference Case over the same period in the Intermediate Demand and High Demand Cases, respe ctively. Total expenditures in these cases over the period can therefore be found by summing the gray and blue and gray and red bars, respectively.

### Natural Gas Infrastructure Implications of Increased Demand from the Electric Power Sector

U.S. Department of Energy Page 31 

## 4. Conclusion

This study concludes that
, under scenarios in which natural gas demand from the electric power sector
increases , the incremental increase in interstate natural gas pipeline expansion and associated
investment is modest
, relative to historical capacity additions

. T he projected rate of interstate pipeline capacity expansion in the scenarios considered in this analysis is lower than th e rate of historical capacity additions over the past 15 years and is consistent with information currently available on planned ca pacity additions over the next 3 years. In the scenarios considered here, 38

– 42 Bcf/d of new and expanded interstate pipeline capacity is projected to be constructed between 2015 and 2030, compared to nearly 127 Bcf/d of pipeline capacity added in the United States between 1998 and 2013

. Similarly, capital expenditures on new interstate pipelines in the scenarios considered here are projected to be significantly less than the capital expenditures associated with infrastructure expansion over the last 15 years. The scenarios in this analysis project $42 billion to $ 45 billion in capital expenditures on new , expanded , and modif ied interstate pipeline capacity between 2015 and 2030, while pipeline capacity expenditures totaled more than $63 billion between 1998 and 2013

. The results of this study are consistent with a recent report prepared by ICF International for the
Interstat e Natural Gas Association of America (INGAA) Foundation. 52 Average annual expenditures on interstate natural gas pipeline infrastructure range from $2.6 billion to $2.8 billion across the cases considered in this analysis between 2015 and 2030

. The INGAA st udy , which utilize s a different set of input assumptions and projection methodologies
, project s annual expenditures that range between $2.7 billion and $4.0 billion ac ross the cases considered in its analysis. 53

Two primary factors mitigate the need for additional interstate natural gas pipeline infrastructure and related capital expenditures in these scenarios. First, the growth in both natural gas demand from electricity generation and natural gas production is broadly distributed rather than geographic ally concentrated, reducing potential interstate pipeline capacity constraints as well as the need for new interstate pipelines . Second, increasing utilization of capacity that is not fully utilized in existing
interstate natural gas pipelines
, re

- routing natural gas flows

, and expanding existing pipeline capacity

are potentially lower

- cost alternatives to building new infrastructure and can accommodate a significant increase in natural gas flows. 54

While the conclusions about interstate pipeline additions a nd capital expenditures are likely to be robust to a range of alternative assumptions , additional research could further inform discussions about natural

gas infrastructure needs and related natural gas system issues

. Such research might consider representation of shorter time intervals (such as peak days or peak hours)

, the role of seasonal and high

-

52 Interstate Natural Gas Association of America Foundation, Inc. , “North American Midstream Infrastructure t hrough 2035: Capitalizing on Our Energy Abundance,” March 17, 2014, accessed November 4, 2014, http://www.ingaa.org/Foundation/Foundation

- Reports/2035Report.aspx

. 53 Ibid., p. 26.
54 As discussed in Section 1 .3 Eco nomics of Natural Gas Transmission , pipeline expansions are driven by basis differential, which means that new pipelines may be constructed even when existing capacity is available to perform the same transportation service, provided that the anticipated revenue can justify the investment and operating costs.

### Natural Gas Infrastructure Implications o f Increased Demand from the Electric Power Sector

Page 32 U.S. Department of Energy deliverability natural gas storage , and more granular regional and local segmentation of natural gas
markets to pinpoint areas where future investment may be needed

. In addition, a variety of other supply and demand cases might be considered, including cases that represent alternative industrial
demand , transportation demand
, or export futures, as well as alternative natural gas supply assumptions.

### Natural Gas Infrastructure Implications of Increased Demand from the Electric Power Sector

U.S. Department of Energy Page 33 

## App endix A. Additional Figures

Appendix A. 1 Map of Electric Power Sector Natural Gas Demand Regions

Region Abbreviation Definition

FRCC Florida Reliability Coordinating Council

MRO Midwest Reliability Organization

NPCC Northeast Power Coordinating Council

RF C ReliabilityFirst Corporation

SERC SERC Reliability Corporation

SPP Southwest Power Pool

TRE Texas Reliability Entity

WECC Western Electricity Coordinating Council

Figure 19 : Map of North American Electric Reliability Corporation (NERC) Regions 55

55 North American Electric Reliability Corporation, “NERC Regions Map,” accessed October 22, 2014, http://www.nerc.com/AboutNERC/keyplayers/Documents/NE RC_Interconnections_Color_072512.jpg

.

### Natural Gas Infrastructure Implications o f Increased Demand from the Electric Power Sector

Page 34 U.S. Department of Energy Appendix A.2 Map of Lower 48 States Shale Plays

Model Region Producing Region

Non

- Shale All conventional, associated, offshore, tight, and coalbed methane production Eagle Ford Eagle Ford shale basin Haynesville Haynesville shale basin

Marcellus Marcellus shale basin

Midcontinent Shales Fayetteville, Woodford , and Arkoma shale basin s
Utica Utica shale b asin
Other Shales Barnet t , Permian, Niob rar a, and all other shale basins

Figure 20 : Map of Lower 48 States Shale Plays 56

56 U.S. Energy Information Administration, “Lower 48 states shale plays,” May 9, 2011, accessed October 22, 2014, http://www.eia.gov/oil_gas/rpd/shale_gas.pdf

.

### Natural Gas Infrastructure Implications of Increased Demand from the Electric Power Sector

U.S. Department of Energy Page 35 Appendix A. 3 Map of Natural Gas Pipeline Expansion Regions

Figure 21 : Map of Natural Gas Pipeline Expansion Regions 57

57 Regions that are not included in this figure are not projected to have pipeline capacity additions. Pipeline capacity additio ns from the Bakken region are not reported with the regional pipeline expansion results, because Bakken region wet natural gas production is represented in the model as natural gas liquids processing that is delivered to the Chicago market via the Alli ance Pipeline. LNG exports are also not reported with the regional pipeline expansion results.

### Natural Gas Infrastructure Implications of Increased Demand from the Electric Power Sector

U.S. Department of Energy Page 37 

## Appendix B. Electric Power Sector Results

Figure 22 shows the projected generation by fuel in the Reference Case. In this case, the majority of electricity generation is supplied by coal

- and natural gas

- fired generation, along with generation from nuclear and renewable energy sources. Coal

- fired generation decreases by 2% from 2015 to 2030, while natural gas

- fired generation increases substantially, by approximately 33 % over the same period. Non

hydro renewabl e generation grows by approximately 76% between 2015 and 2030, but the absolute
increase is slightly less than half of the increase from natural gas

- fired sources.

Figure 22 : Electric Sector Generat ion by Fuel in the Reference Case, 2015 to 2030 58
Regional natural gas

- fired generation is shown in Figure 23

. While the WECC (ex cluding CA) region is expected to experience the l argest relative increase in natural gas

- fired generation during the forecast period (a 106% increase and absolute growth of 112 terawatt

- hours [ TWh ] ), the Southeast ( SERC and
FRCC ) is expected to see the largest absolute increase in natural gas

- fired gener ation (a 31% increase and absolute growth of 137 TWh). 59 Part of the increase in natural gas

- fired generation in these regions
stems from a decrease in coal

- fired capacity ; both WECC (ex cluding CA) and the Southeast (i.e.

, SERC and FRCC) have large coal

- fired fleets with a significant number of announced retirements.

58 The label “Imports” represents U. S. imports of electricity generated in Canada.
59 For a map of the regions mentioned here, see Appendix A. 1 Map of Electric Power Sector Natural Gas Demand Regions

.

### Natural Gas Infrastructure Implications o f Increased Demand from the Electric Power Sector

Page 38 U.S. Department of Energy

Figure 23 : Natural Gas

- F ired Generation by Region in the Reference Case, 2015 to 2030
Figure 24 shows the shift in generation in the Intermediate and High Demand Cases relative to the Reference Case. The dominant source of replacement generation for coal in both cases is natural gas

fired generation. Non

- hydro renewables make up the balance
, with a small contribution from cross

border imports from Canada (shown as “ Imports ” ).

In the High Demand C ase, all coal

- fired power plants that lacked scrubber

- type emissions controls as of the first quarter of 2014 (the m ost recent data that were available prior to publication of this report) are assumed to retire in 2017. Consequently, the electric power sector responds in two steps: first, in 2017

, when the coal

- fired capacity is retired, and then again in 2020, when the illustrative national carbon policy begins to affect dispatch. The reduction in coal

- fired capacity assumed in the High Demand Case drives a larger shift from coal to natural gas, renewables, and imports.

### Natural Gas Infrastructure Implications of Increased Demand from the Electric Power Sector

U.S. Department of Energy Page 39

Figure 24 : Change in Generation in the Intermediate Demand and High Demand Cases

Relative to the Reference Case, 2015 to 2030 60

60 The label “Imports” represents U.S. imports of electricity generated in Canada.

### Natural Gas Infrastructure Implications o f Increased Demand from the Electric Power Sector

Page 40 U.S. Department of Energy