MIT Study on the Future of Natural Gas iii 

# Foreword and Acknowledgements

The Future of Natural Gas is the fourth in a series of MIT multidisciplinary reports examin

ing the role of various energy sources that may be important for meeting future demand under carbon dioxide (CO 2 ) emissions constraints. In each case, we explore the steps needed to enable competitiveness in a future marketplace condi

tioned by a CO 2 emissions price or by a set of regulatory initiatives. This report follows an interim report issued in June 2010.
The first three reports dealt with nuclear power (2003), coal (2007) and the nuclear fuel cycle (2010 and 2011). A study of natural gas is more complex than these previous reports because gas is a major fuel for multiple end uses — electricity, industry, heating — and is increasingly discussed as a potential pathway to reduced oil dependence for transportation. In addition, the realization over the last few years that the producible unconventional gas resource in the U.S. is very large has intensified the discussion about natural gas as a “bridge” to a low-carbon future. Recent indications of a similarly large global gas shale resource may also transform the geopolitical landscape for gas. We have carried out the integrated analysis reported here as a contribution to the energy, security and climate debate.
Our primary audience is U.S. government, industry and academic leaders, and decision makers. However, the study is carried out with an international perspective.
This study is better as a result of comments and suggestions from our distinguished external Advisory Committee, each of whom brought important perspective and experience to our discussions. We are grateful for the time they invested in advising us. However, the study is the responsibility of the MIT study group and the advisory committee members do not necessarily endorse all of its findings and recommendations, either individually or collectively.
Finally, we are very appreciative of the support from several sources. First and foremost, we thank the American Clean Skies Foundation. Discussions with the Foundation led to the conclusion that an integrative study on the future of natural gas in a carbon-constrained world could contribute to the energy debate in an important way, and the Foundation stepped forward as the major sponsor. MIT Energy Initiative (MITEI) members Hess Corporation and Agencia Naçional de Hidrocarburos (Colombia), the Gas Technology Institute (GTI), Exelon, and an anonymous donor provided additional support. The Energy Futures Coali

tion supported dissemination of the study results, and MITEI employed internal funds and fellowship sponsorship to support the study as well. As with the advisory committee, the sponsors are not responsible for and do not necessarily endorse the findings and recommen

dations. That responsibility lies solely with the MIT study group.

We thank Victoria Preston and Rebecca Marshall-Howarth for editorial support and Samantha Farrell for administrative support.MIT Study on the Future of Natural Gas v 

# Study Participants

ERNEST J. MONIZ — CHAIR Cecil and Ida Green Professor of Physics

and Engineering Systems, MIT Director, MIT Energy Initiative (MITEI)

HENRY D. JACOBY — CO-CHAIR Professor of Management, MIT

ANTHONY J. M. MEGGS — CO-CHAIR Visiting Engineer, MITEI

STUDY GROUP

ROBERT C. ARMSTRONG Chevron Professor, Department of Chemical

Engineering, MIT Deputy Director, MITEI

DANIEL R. COHN Senior Research Scientist, Plasma Science

and Fusion Center, MIT Executive Director, Natural Gas Study

STEPHEN R. CONNORS Research Engineer, MITEI

JOHN M. DEUTCH Institute Professor,

Department of Chemistry, MIT

QUDSIA J. EJAZ Postdoctoral Associate, MITEI

JOSEPH S. HEZIR Visiting Engineer, MITEI

GORDON M. KAUFMAN Morris A. Adelman Professor of Management

(Emeritus), MIT MELANIE A. KENDERDINE Executive Director, MITEI

FRANCIS O’SULLIVAN Research Engineer, MITEI

SERGEY PALTSEV Principal Research Scientist, Joint Program on

the Science and Policy of Global Change, MIT

JOHN E. PARSONS Senior Lecturer, Sloan School of Management, MIT Executive Director, Joint Program on the

Science and Policy of Global Change and Center for Energy and Environmental Policy Research, MIT

IGNACIO PEREZ-ARRIAGA Professor of Electrical Engineering,

Comillas University, Spain Visiting Professor, Engineering Systems Division, MIT

JOHN M. REILLY Senior Lecturer, Sloan School of Management, MIT Co-Director, Joint Program on the Science

and Policy of Global Change, MIT

CAROLYN SETO Clare Boothe Luce Postdoctoral Fellow,

Department of Chemical Engineering, MIT

MORT D. WEBSTER Assistant Professor, Engineering Systems

Division, MIT

YINGXIA YANG MITEI STUDY CO-CHAIRSvi MIT STUDY ON THE FUTURE OF NATURAL GAS CONTRIBUTING AUTHORS

GREGORY S. MCRAE Professor of Chemical Engineering (Emeritus),

MIT

CAROLYN RUPPEL Visiting Scientist, Department of Earth,

Atmospheric and Planetary Sciences, MIT GRADUATE RESEARCH ASSISTANTS

SARAH FLETCHER

JOHN MICHAEL HAGERTY Exelon – MIT Energy Fellow

ORGHENERUME KRAGHA

TOMMY LEUNG

Cummins – MIT Energy Fellow

PAUL MURPHY

Total – MIT Energy Fellow

ANIL RACHOKONDA

KAREN TAPIA-AHUMADA

GTI – MIT Energy Fellow

IBRAHIM TOUKAN Constellation – MIT Energy Fellow

DOGAN UCOK

YUAN YAOMIT Study on the Future of Natural Gas vii 

# Advisory Committee Members

THOMAS F. (MACK) MCLARTY, III — CHAIRMAN President & CEO, McLarty Associates

DENISE BODE CEO, American Wind Energy Association

RALPH CAVANAGH Senior Attorney and Co-Director of Energy Program,

Natural Resource Defense Council

SUNIL DESHMUKH Founding Member, Sierra Club India

Advisory Council

JOSEPH DOMINGUEZ Senior Vice President, Exelon Corporation

RON EDELSTEIN Director, Regulatory and Government Relations,

GTI

NEAL ELLIOTT Associate Director for Research, American

Council for an Energy-Efficient Economy

JOHN HESS Chairman and CEO, Hess Corporation

JAMES T. JENSEN President, Jensen Associates SENATOR ( ret .) J. BENNETT JOHNSTON Chairman, Johnston Associates

VELLO A. KUUSKRAA President, Advance Resources International, Inc.

MIKE MING Oklahoma Secretary of Energy

THEODORE ROOSEVELT IV Managing Director & Chairman, Barclays Capital

Clean Tech Initiative

OCTAVIO SIMOES Vice President of Commercial Development,

Sempra Energy

GREG STAPLE CEO, American Clean Skies Foundation

PETER TERTZAKIAN Chief Energy Economist and Managing Director,

ARC Financial

DAVID VICTOR Director, Laboratory on International Law

and Regulation, University of California, San Diego

ARMANDO ZAMORA Director, ANH-Agencia Nacional De Hidrocarburos

While the members of the advisory committee provided invaluable perspective and advice to the study group, individual members may have different views on one or more matters addressed in the report. They are not asked to individually or collectively endorse the report findings and recommendations.MIT Study on the Future of Natural Gas xiii 

# Abstract

Natural gas is finding its place at the heart of the energy discussion. The recent emergence of substantial new supplies of natural gas in the U.S., primarily as a result of the remarkable speed and scale of shale gas development, has heightened awareness of natural gas as a key component of indigenous energy supply and has lowered prices well below recent expectations. This study seeks to inform discussion about thefuture of natural gas, particularly in a carbonconstrained economy.
There are abundant supplies of natural gas in the world, and many of these supplies can be developed and produced at relatively low cost. In North America, shale gas development over the past decade has substantially increased assessments of resources producible at modest cost. Consequently, the role of natural gas is likely to continue to expand, and its relative importance is likely to increase even further when greenhouse gas emissions are constrained. In a carbon-constrained world, a level playing field — a carbon dioxide (CO 2 ) emissions price for all fuels without subsidies or other preferen

tial policy treatment —maximizes the value to society of the large U.S. natural gas resource.
There are also a number of key uncertainties: the extent and nature of greenhouse gas emission mitigation measures that will be adopted; the mix of energy sources as the relative costs of fuels and technologies shift over time; the evolution of international natural gas markets. We explore how these uncertainties lead to different out

comes and also quantify uncertainty for natural gas supply and for the U.S. electricity fuel mix.
The environmental impacts of shale development are challenging but manageable. Research and regulation, both state and Federal, are needed to minimize the environmental consequences. The U.S. natural gas supply situation has enhanced the substitution possibilities for natural gas in the electricity, industry, buildings, and transportation sectors.
In the U.S. electricity supply sector, the cost benchmark for reducing carbon dioxide emissions lies with substitution of natural gas for coal, especially older, less efficient units. Substitution through increased utilization of existing combined cycle natural gas power plants provides a rela

tively low-cost, short-term opportunity to reduce U.S. power sector CO 2 emissions by up to 20%, while also reducing emissions of criteria pollut

ants and mercury.
Furthermore, additional gas-fired capacity will be needed as backup if variable and intermittent renewables, especially wind, are introduced on a large scale. Policy and regulatory steps are needed to facilitate adequate capacity investment for system reliability and efficiency. These increas

ingly important roles for natural gas in the electricity sector call for a detailed analysis of the interdependencies of the natural gas and power generation infrastructures.
The primary use of natural gas in the U.S. manufacturing sector is as fuel for boilers and process heating, and replacement with new higher efficiency models would cost-effectively reduce natural gas use. Natural gas could also substitute for coal in boilers and process heaters and provide a cost-effective alternative for compliance with Environmental Protection Agency (EPA) Maximum Achievable Control Technology standards.
In the residential and commercial buildings sector, transformation of the current approach to efficiency standards to one based on full fuel cycle analysis will enable better comparison of different energy supply options (especiallyxiv MIT STUDY ON THE FUTURE OF NATURAL GAS natural gas and electricity). Efficiency metrics should be tailored to regional variations in climate and electricity supply mix.
Within the U.S. market, the price of oil (which is set globally) compared to the price of natural gas (which is set regionally) is very important in determining market share when there is the opportunity for substitution. Over the last decade or so, when oil prices have been high, the ratio of the oil price to the natural gas price has been consistently higher than any of the standard rules of thumb. If this trend is robust, use of natural gas in transportation, either through direct use or following conversion to a liquid fuel, could in time increase appreciably. The evolution of global gas markets is unclear. A global “liquid” natural gas market is benefi

cial to U.S. and global economic interests and, at the same time, advances security interests through diversity of supply and resilience to disruption. The U.S. should pursue policies that encourage the development of such a market, integrate energy issues fully into the conduct of U.S. foreign policy, and promote sharing of know-how for strategic global expansion of unconventional gas production.
Past research, development, demonstration, and deployment (RDD&D) programs supported with public funding have led to significant advances for natural gas supply and use. Public-private partnerships supporting a broad natural gas research, development, and demonstration (RD&D) portfolio should be pursued.Chapter 1: Overview and Conclusions 1 

# Chapter 1: Overview and Conclusions

PUR P OSE AND O UTLINE OF THE S TUDY
Despite its vital importance to the national economy, natural gas has often been overlooked, or at best taken for granted, in the debate about the future of energy in the U.S. Over the past two or three years this has started to change, and natural gas is finding its place at the heart of the energy discussion.

There are a number of reasons for this shift. The recent emergence of substantial new sup

plies of natural gas in the U.S., primarily as a result of the remarkable speed and scale of shale gas development, has heightened awareness of natural gas as a key component of indigenous energy supply and lowered prices well below recent expectations. Instead of the anticipatedgrowth of natural gas imports, the scale of domestic production has led producers to seek new markets for natural gas, such as an expanded role in transportation. Most importantly for this study, there has been a growing recognition that the low carbon content of natural gas relative to other fossil fuels could allow it to play a signifi

cant role in reducing carbon dioxide (CO 2 ) emissions, acting as a “bridge” to a low

- carbon future.
Within this context, the MIT study of The Future of Natural Gas seeks to inform the discussion around natural gas by addressing a fundamental question: what is the role of natural gas in a carbon-constrained economy?
In exploring this question, we seek to improve general understanding of natural gas, and examine a number of specific issues. How much natural gas is there in the world, how expensive is it to develop, and at what rate can it be pro

duced? We start from a global perspective, and then look in detail at U.S. natural gas resources, paying particular attention to the extent and cost of shale gas resources, and whether these sup

plies can be developed and produced in an environmentally sound manner. Having explored supply volumes and costs, we use integrated models to examine the role that natural gas could play in the energy system under different carbon

- constraining mechanisms or policies. It is important to recognize that the study does not set out to make predictions or forecasts of the likelihood or direction of CO 2 policy in the U.S. Rather, we examine a number of different scenarios and explore their possible impacts on the future of natural gas supply and demand.
Natural gas is important in many sectors of the economy — for electricity generation, as an industrial heat source and chemical feedstock, and for water and space heating in residential and commercial buildings. Natural gas competes directly with other energy inputs in these sectors. But it is in the electric power sector — where natural gas competes with coal, nuclear, hydro, wind and solar — that inter

- fuel competition is most intense. We have, therefore, explored in depth how natural gas performs in the electric power sector under different scenarios. We have also taken a close look at the critical interaction between intermittent forms of renewable energy, such as wind and solar, and gas

- fired power as a reliable source of backup capacity.
We look at the drivers of natural gas use in the industrial, commercial and residential sectors, and examine the important question of whether natural gas, in one form or another, could be a viable and efficient substitute for gasoline or diesel in the transportation sector. We also examine the possible futures of global natural gas markets, and the geopolitical significance of the ever

- expanding role of natural gas in the global economy. Finally, we make recommendations for research and development priorities and for the means by which public support should be provided.2 MIT S T UDY O N T HE FU T URE OF N A T URAL GA S H IGH-LEVEL FINDINGS
The findings and recommendations of the study are discussed later in this chapter, and covered in detail in the body of this report. Nevertheless, it is worth summarizing here the highest level conclusions of our study:

1. There are abundant supplies of natural gas in the world , and many of these supplies can be developed and produced at relatively low cost. In the U.S., despite their relative maturity, natural gas resources continue to grow, and the development of low

- cost and abundant unconventional natural gas resources, particularly shale gas, has a material impact on future availability and price.

2. Unlike other fossil fuels, natural gas plays a major role in most sectors of the modern economy — power generation, industrial, commercial and residential. It is clean and flexible. The role of natural gas in the world is likely to continue to expand under almost all circumstances , as a result of its availability, its utility and its comparatively low cost.

3. In a carbon

- constrained economy, the relative importance of natural gas is likely to increase even further, as it is one of the
most cost

- effective means by which to maintain energy supplies while reducing CO 2 emissions. This is particularly true in the electric power sector, where, in the U.S., natural gas sets the cost benchmark against which other clean power sources must compete to remove the marginal ton of CO 2 .

4. In the U.S., a combination of demand reduction and displacement of coal

- fired power by gas

- fired generation is the lowest

cost way to reduce CO 2 emissions by up to 50%. For more stringent CO 2 emissions reductions, further de

- carbonization of the energy sector will be required; but natural gas provides a cost-effective bridge to such a low-carbon future

. 5. Increased utilization of existing natural gas combined cycle (NGCC) power plants provides a relatively, low

- cost short

- term opportunity to reduce U.S. CO 2 emissions by up to 20% in the electric power sector, or 8% overall, with minimal additional capital investment in generation and no new technology requirements.

6. Natural gas

- fired power capacity will play an increasingly important role in providing backup to growing supplies of intermittent renewable energy, in the absence of a breakthrough that provides affordable utility

- scale storage. But in most cases, increases in renewable power generation will be at the expense of natural gas

- fired power generation in the U.S.

7. The current supply outlook for natural gas will contribute to greater competitiveness of U.S. manufacturing, while the use of more efficient technologies could offset increases in demand and provide cost

effective compliance with emerging envi

ronmental requirements.

8. Transformation of the current approach to appliance standards to one based on full fuel cycle analysis will enable better com

parison of different energy supply options in commercial and residential applications.

9. Natural gas use in the transportation sector is likely to increase, with the primary benefit being reduced oil dependence. Compressed natural gas (CNG) will play a role, particularly for high

- mileage fleets, but the advantages of liquid fuel in trans

portation suggest that the chemical conver

sion of gas into some form of liquid fuel may be the best pathway to significant market penetration

.Chapter 1: Overview and Conclusions 3 10. International gas trade continues to grow in scope and scale, but its economic, security and political significance is not yet adequately recognized as an important focus for U.S. energy concerns.

11. Past research, development, demonstration and deployment (RDD&D) programs supported with public funding have led to significant advances for natural gas supply and use.

BACKGROUND

The Fundamental Characteristics of Natural Gas

Fossil fuels occur in each of the three funda

mental states of matter: in solid form as coal; in liquid form as oil and in gaseous form as natural gas. These differing physical character

istics for each fuel type play a crucial part in shaping each link in their respective supply chains: from initial resource development and production through transportation, conversion to final products and sale to customers. Their physical form fundamentally shapes the markets for each type of fossil fuel.
Natural gas possesses remarkable qualities. Among the fossil fuels, it has the lowest carbon intensity, emitting less CO 2 per unit of energy generated than other fossil fuels. It burns cleanly and efficiently, with very few non

- carbon emis sions. Unlike oil, natural gas generally requires limited processing to prepare it for end use. These favorable characteristics have enabled natural gas to penetrate many markets, including domestic and commercial heating, multiple industrial processes and electrical power.
Natural gas also has favorable characteristics with respect to its development and production. The high compressibility and low viscosity of natural gas allows high recoveries from conven

tional reservoirs at relatively low cost, and also enables natural gas to be economically recov

ered from even the most unfavorable subsurface environments, as recent developments in shale formations have demonstrated.
These physical characteristics underpin the current expansion of the unconventional resource base in North America, and the potential for natural gas to displace more carbon

- intensive fossil fuels in a carbon

constrained world.
On the other hand, because of its gaseous form and low energy density, natural gas is uniquely disadvantaged in terms of transmission and storage. As a liquid, oil can be readily trans

ported over any distance by a variety of means, and oil transportation costs are generally a small fraction of the overall cost of developing oil fields and delivering oil products to market. This has facilitated the development of a truly global market in oil over the past 40 years or more.
By contrast, the vast majority of natural gas supplies are delivered to market by pipeline, and delivery costs typically represent a relatively large fraction of the total cost in the supply chain. These characteristics have contributed to the evolution of regional markets rather than a truly global market in natural gas. Outside North America, this somewhat inflexible pipeline infrastructure gives strong political and economic power to those countries that control the pipelines. To some degree, the evolution of the spot market in Liquefied Natural Gas (LNG) is beginning to introduce more flexibility into global gas markets and stimulate real global trade. The way this trade may evolve over time is a critical uncertainty that is explored in this report.4 MIT S T UDY O N T HE FU T URE OF N A T URAL GA S The Importance of Natural Gas in the Energy System
Natural gas represents a very important, and growing, part of the global energy system. Over the past half century, natural gas has gained market share on an almost continuous basis, growing from some 15.6% of global energy consumption in 1965 to around 24% today. In absolute terms, global natural gas consumption over this period has grown from around 23 trillion cubic feet (Tcf) in 1965 to 104 Tcf in 2009, a more than fourfold increase.
Within the U.S. economy, natural gas plays a vital role. Figure 1.1 displays the sources and uses of natural gas in the U.S. in 2009, and it reveals a number of interesting features that are explored in more detail in the body of this report. At 23.4 quadrillion British thermal units (Btu) 1 , or approximately 23 Tcf, gas represents a little under a quarter of the total energy supply in the U.S., with almost all of this supply now coming from indigenous resources. Perhaps of more significance, is the very important role that natural gas plays in all sectors of the economy, with the exception of transport. Very approxi

mately, the use of natural gas is divided evenly between three major sectors: industrial, residen

tial and commercial, and electric power. The 3% share that goes to transport is almost all associ

ated with natural gas use for powering oil and gas pipeline systems, with only a tiny fraction going into vehicle transport.

In the Residential and Commercial sectors, natural gas provides more than three

- quarters of the total primary energy, largely as a result of its efficiency, cleanliness and convenience for uses such as space and hot water heating. It is also a major primary energy input into the Industrial sector, and thus the price of natural gas has a very significant impact on the com

petitiveness of some U.S. manufacturing industries. While natural gas provided 18% of the primary fuel for power generation in 2009,

Figure 1.1 Sources and Use of Primary Energy Sources in the U.S. with Natural Gas Highlighted (quadrillion Btu), 2009

Source: EIA, Annual Energy Outlook, 2009 Supply Sources Demand Sources

Petroleum

Natural Gas

Coal

Renewables

Nuclear 35.3

19.7

7.7

8.3 Transportation

Industrial

Residential & Commercial

Electric Power 23.4 27.0

18.8

10.6

38.6 72%
22% 1% 5% 94%

3%

41%

7%

11% 48% 11%

17%

22% 1% 1%

1% 3%

40%

76%

18% 30% 3%

35% 32%

7%

100%

53% 9% 26% 12%

93% <1% 94.6 Quads

Percent of Source Percent of SectorChapter 1: Overview and Conclusions 5 it provided 23% of the produced electricity, reflecting the higher efficiency of natural gas plants. As will be seen later in this report, natural gas

- fired capacity represents far more than 23% of total power generating capacity, providing a real opportunity for early action in controlling CO 2 emissions.
A Brief History of Natural Gas in the U.S.
The somewhat erratic history of natural gas in the U.S. over the last three decades or so provides eloquent testimony to the difficulties of forecasting energy futures, particularly for natural gas. It also serves as a reminder of the need for caution in the current period of supply exuberance.
The development of the U.S. natural gas market was facilitated by the emergence of an interstate natural gas pipeline system, supplying local distribution systems. This market structure was initially viewed as a natural monopoly and was subjected to cost

- of

- service regulation by both the Federal government and the states. Natural gas production and use grew considerably under this framework in the 1950s, 1960s and into the 1970s.
Then came a perception of supply scarcity. After the first oil embargo, energy consumers sought to switch to natural gas. However, the combination of price controls and tightly regulated natural gas markets dampened incentives for domestic gas development, contributing to a perception that U.S. natural gas resources were limited. In 1978, convinced that the U.S. was running out of natural gas, Congress passed the Power Plant and Industrial Fuel Use Act (FUA) that essentially outlawed the building of new gas

- fired power plants. Between 1978 and 1987 (the year the FUA was repealed), the U.S. added 172 Gigawatts (GW) of net power generation capacity. Of this, almost 81 GW was new coal capacity, around 26% of today’s entire coal fleet. About half of the remainder was nuclear power. By the mid 1990s, wholesale electricity markets and wellhead natural gas prices had been deregulated; new, highly efficient and relatively inexpensive combined cycle gas turbines had been deployed and new upstream technologies had enabled the development of offshore natural gas resources. This contributed to the perception that domestic natural gas supplies were sufficient to increase the size of the U.S. natural gas market from around 20 Tcf/year to much higher levels. New gas

- fired power capacity was added at a rapid pace.
Between 1989 after the repeal of the FUA and 2009, the U.S. added 306 GW of generation capacity, 88% of which was gas fired and 4% was coal fired. 2 Today, the nameplate capacity of this gas

- fired generation is significantly under

utilized, and the anticipated large increase in natural gas use has not materialized.
By the turn of the 21st century, a new set of concerns arose about the adequacy of domestic natural gas supplies. Conventional supplies were in decline, unconventional natural gas resources remained expensive and difficult to develop and overall confidence in gas plum

meted. Natural gas prices started to rise, becom

ing more closely linked to the oil price, which itself was rising. Periods of significant natural gas price volatility were experienced.
This rapid buildup in natural gas price, and perception of long

- term shortage, created economic incentives for the accelerated devel

opment of an LNG import infrastructure. Since 2000, North America’s rated LNG capacity has expanded from approximately 2.3 billion cubic feet (Bcf)/day to 22.7 Bcf/day, around 35% of the nation’s average daily requirement.
This expansion of LNG capacity coincided with an overall rise in the natural gas price and the market diffusion of technologies to develop affordable unconventional gas. The game

changing potential of these technologies, combined with the large unconventional6 MIT S T UDY O N T HE FU T URE OF N A T URAL GA S resource base, has become more obvious over the last few years, radically altering the U.S. supply picture. We have once again returned to a period where supply is seen to be abundant. New LNG import capacity goes largely unused at present, although it provides a valuable supply option for the future.
These cycles of perceived “feast and famine” demonstrate the genuine difficulty of forecast

ing the future and providing appropriate policy support for natural gas production and use. They underpin the efforts of this study to account for this uncertainty in an analytical

manner.
Major Uncertainties
Looking forward, we anticipate policy and geopolitics, along with resource economics and technology developments, will continue to play a major role in determining global supply and market structures. Thus, any analysis of the future of natural gas must deal explicitly with multiple uncertainties:

s The extent and nature of the greenhouse gas

(GHG) mitigation measures that will be adopted : the U.S. legislative response to the climate threat has proved quite challenging. However, the Environmental Protection Agency (EPA) is developing regulations under the Clean Air Act, and a variety of local, state and regional GHG limitation programs have been put in place. At the international level, reliance upon a system of voluntary national pledges of emission reductions by 2020, as set out initially in the Copenhagen Accord, leaves uncertainty concerning the likely structure of any future agreements that may emerge to replace the Kyoto Protocol. The absence of a clear international regime for mitigating GHG emissions in turn raises questions about the likely stringency of national policies in both industrialized countries and major emerging economies over coming decades. s The likely technology mix in a carbonconstrained world , particularly in the powersector: the relative costs of different technologies may shift significantly in response to RD&D, and a CO 2 emissions price will affect the relative costs. Moreover, the tech

nology mix will be affected by regulatory and subsidy measures that will skew economic choices.

s The ultimate size and production cost of the

natural gas resource base , and the environ

mental acceptability of production methods: much remains to be learned about the perfor

mance of shale gas plays, both in the U.S. and in other parts of the world. Indeed, even higher risk and less well

- defined unconventional natural gas resources, such as methane hydrates, could make a contribution to supply in the later decades of the study’s time horizon.

s The evolution of international natural gas

markets : very large natural gas resources are to be found in several areas outside the U.S., and the role of U.S. natural gas will be influenced by the evolution of this market — particularly the growth and efficiency of trade in LNG. Only a few years back, U.S. industry was investing in facilities for sub

stantial LNG imports. The emergence of the domestic shale gas resource has depressed this business in the U.S., but in the future, the nation may again look to international markets.

Of these uncertainties, the last three can be explored by applying technically grounded analysis: lower cost for carbon capture and sequestration (CCS), renewables and nuclear power; producible resources of different levels and regional versus global integrated markets. In contrast, the shape and size of GHG mitiga

tion measures is likely to be resolved only through complex ongoing political discussions at the national level in the major emitting countries and through multilateral negotiations.Chapter 1: Overview and Conclusions 7 The analysis in this study is based on three policy scenarios:

1. A business

- as

- usual case, with no significant carbon constraints;

2. GHG emissions pricing, through a cap

and

- trade system or emissions tax, leading to a 50% reduction in U.S. emissions below the 2005 level, by 2050.

3. GHG reduction via U.S. regulatory measures without emissions pricing: a renewable portfolio standard and measures forcing the retirement of some coal plants.
Our analysis is long term in nature, with a 2050 time horizon. We do not attempt to make detailed short

- term projections of volumes, prices or price volatility, but rather focus on the long

- term consequences of the carbon mitigation scenarios outlined above, taking into account the manifold uncertainties in a highly complex and interdependent energy system.

MAJOR F INDINGS AND R ECO MM ENDATIONS
In the following section we summarize the major findings and recommendations for each chapter of the report.
Supply
Globally, there are abundant supplies of natural gas, much of which can be developed at relatively low cost. The mean projection of remaining recoverable resource in this report is 16,200 Tcf, 150 times current annual global natural gas consumption, with low and high projections of 12,400 Tcf and 20,800 Tcf, respectively. Of the mean projection, approxi

mately 9,000 Tcf could be developed economi

cally with a natural gas price at or below $4/ Million British thermal units (MMBtu) at the export point. Unconventional natural gas, and particularly shale gas, will make an important contribution to future U.S. energy supply and CO 2 emission

reduction efforts. Assessments of the recover

able volumes of shale gas in the U.S. have increased dramatically over the last five years, and continue to grow. The mean projection of the recoverable shale gas resource in this report is approximately 650 Tcf, with low and high projections of 420 Tcf and 870 Tcf, respectively. Of the mean projection, approximately 400 Tcf could be economically developed with a natural gas price at or below $6/MMBtu at the wellhead. While the pace of shale technology development has been very rapid over the past few years, there are still many scientific and technological challenges to overcome before we can be

con fident that this very large resource base is being developed in an optimum manner.
Although there are large supplies, global conven

tional natural gas resources are concentrated geographically, with 70% in three countries: Qatar, Iran and Russia. There is considerable potential for unconventional natural gas supply outside North America, but these resources are largely unproven with very high resource uncertainty. Nevertheless, unconventional supplies could provide a major opportunity for diversification and improved security of supply in some parts of the world.
The environmental impacts of shale develop

ment are challenging but manageable. Shale development requires large

- scale fracturing of the shale formation to induce economic production rates. There has been concern that these fractures can also penetrate shallow freshwater zones and contaminate them with fracturing fluid, but there is no evidence that this is occurring. There is, however, evidence of natural gas migration into freshwater zonesin some areas, most likely as a result of substandard well completion practices by a few operators. There are additional environmental8 MIT S T UDY O N T HE FU T URE OF N A T URAL GA S challenges in the area of water management, particularly the effective disposal of fracture fluids. Concerns with this issue are particularly acute in regions that have not previously experienced large

- scale oil and natural gas development, especially those overlying the massive Marcellus shale, and do not have a well

- developed subsurface water disposal infrastructure. It is essential that both large and small companies follow industry best practices; that water supply and disposal are coordinated on a regional basis and that improved methods are developed for recycling of returned fracture fluids.
Natural gas trapped in the ice

- like form known as methane hydrate represents a vast potential resource for the long term. Recent research is beginning to provide better definition of the overall resource potential, but many issues remain to be resolved. In particular, while there have been limited production tests, the long

term producibility of methane hydrates remains unproven, and sustained research will be required.

MAJOR R ECO M M ENDATIONS Government-supported research on the fundamental challenges of unconventional natural gas development, particularly shale gas, should be greatly increased in scope and scale. I n particular, support should be put in place for a comprehensive and integrated research program to build a system-wide understanding of all subsurface aspects of the U. S . shale

resource. I n addition, research should be pursued to reduce water usage in fracturing and to develop cost-e ff ective water recycling technology.

A concerted coordinated e ff ort by industry and government, both state and Federal, should be organized so as to minimize the environmental impacts of shale gas development through both research and regulation. T ransparency is key, both for fracturing operations and for water management. Better communication of oil- and gas-field best practices should be facilitated. I ntegrated regional water usage and disposal plans and disclosure of hydraulic fracture fluid components should be required.

T he U. S . should support unconventional natural gas development outside U. S ., particularly in E urope and C hina, as a means of diversifying the natural gas supply base.

T he U. S . government should continue to sponsor methane hydrate research, with a particular emphasis on the demonstration of production feasibility and economics.

U
. S
. N atural G as Production, U se and T rade: Potential F utures

In a carbon

- constrained world, a level playing field — a CO 2 emissions price for all fuels without subsidies or other preferential policy treatment — maximizes the value to society of the large U.S. natural gas resource.

Under a scenario with 50% CO 2 reductions to 2050, using an established model of the global economy and natural gas cost curves that include uncertainty, the principal effects of the associated CO 2 emissions price are to lower energy demand and displace coal with natural gas in the electricity sector. In effect, gas-fired power sets a competitive benchmark against which other technologies must compete in a lower carbon environment . A major uncertainty that could impact this picture in the longer term is technology development that lowers the costs of alternatives, in particular, renewables, nuclear and CCS.Chapter 1: Overview and Conclusions 9 A more stringent CO 2 reduction of, for exam

ple, 80% would probably require the complete de

- carbonization of the power sector. This makes it imperative that the development of competing low

- carbon technology continues apace, including CCS for both coal and natural gas. It would be a significant error of policy to crowd out the development of other, currently more costly, technologies because of the new assessment of the natural gas supply. Con

versely, it would also be a mistake to encourage, via policy and long

- term subsidy, more costly technologies to crowd out natural gas in the short to medium term, as this could signifi

cantly increase the cost of CO 2 reduction.
The evolution of global natural gas markets is unclear; but under some scenarios, the U.S. could import 50% or more of its natural gas by 2050, despite the significant new resources created in the last few years. Imports can prevent natural gas

- price inflation in future years.

MAJOR R ECO M M ENDATIONS T

o maximize the value to society of the substantial U. S . natural gas resource base, U. S

. CO 2 reduction policy should be designed to create a “level playing field,” where all energy technologies can compete against each other in an open marketplace conditioned by legislated CO 2 emissions goals. A CO 2 price for all fuels without long-term subsidies or other preferential policy treatment is the most e ff ective way to achieve this result.

I n the absence of such policy, interim energy policies should attempt to replicate as closely as possible the major consequencesof a “level playing field” approach to carbonemissions reduction. A t least for the near term, that would entail facilitating energy demand reduction and displacement of some coal generation with natural gas. N atural gas can make an important contribution to GHG reduction in coming decades, but investment in low-emission technologies, such as nuclear, CCS and renewables, should be actively pursued to ensure that a mitigation regime can be sustained in the longer term.

Natural Gas for Electric Power
In the U.S., around 30% of natural gas is consumed in the electric power sector. Within the power sector, gas

- fired power plants play a critical role in the provision of peaking capacity, due to their inherent ability to respond rapidly to changes in demand. In 2009, 23% of the total power generated was from natural gas, while natural gas plants represented over 40% of the total generating capacity.

In a carbon

- constrained world, the power sector represents the best opportunity for a significant increase in natural gas demand, in direct competition with other primary energy sources. Displacement of coal

- fired power by gas

- fired power over the next 25 to 30 years is the most cost

- effective way of reducing CO 2 emissions in the power sector.

As a result of the boom in the construction of gas

- fired power plants in the 1990s, there is a substantial amount of underutilized NGCC capacity in the U.S. today. In the short term, displacement of coal

- fired power by gas

- fired power provides an opportunity to reduce CO 2 emissions from the power sector by about 20%, at a cost of less than $20/ton of CO 2 avoided. This displacement would use existing generating capacity, and would, therefore, require little in the way of incremental capital expenditure for new genera tion capacity. It would also signifi

cantly reduce pollutants such as sulfur dioxide (SO 2 ), nitrous oxide (NO X ), particulates and mercury (Hg).10 MIT S T UDY O N T HE FU T URE OF N A T URAL GA S Natural gas

- fired power generation provides the major source of backup to intermittent renew

able supplies in most U.S. markets. If policy support continues to increase the supply of intermittent power, then, in the absence of affordable utility

- scale storage options, addi

tional natural gas capacity will be needed to provide system reliability. In some markets, existing regulation does not provide the appropriate incentives to build incremental capacity with low load factors, and regulatory changes may be required.
In the short term, where a rapid increase in renewable generation occurs without any adjustment to the rest of the system, increased renewable power displaces gas

- fired power generation and thus reduces demand for natural gas in the power sector. In the longer term, where the overall system can adjust through plant retirements and new construc

tion, increased renewables displace baseload generation. This could mean displacement of coal, nuclear or NGCC generation, depending on the region and policy scenario under consideration. For example, in the 50% CO 2 reduction scenario described earlier, where gas

- fired generation drives out coal generation, increased renewable penetration as a result of cost reduction or government policy will reduce natural gas generation on a nearly

one

- for

- one basis.

MAJOR R ECO M M ENDATIONS T he displacement of coal generation with N G CC generation should be pursued as the most practical near-term option for significantly reducing CO 2 emissions from power generation.

I n the event of a significant penetration of intermittent renewable production in the generation technology mix, policy and regulatory measures should be developed to facilitate adequate levels of investment in natural gas generation capacity to ensure system reliability and e ffi ciency. E ND USE GAS DE M AND
In the U.S., around 32% of all natural gas consumption is in the Industrial sector, where its primary uses are for boiler fuel and process heat; and 35% of use is in the Residential and Commercial sectors, where its primary applica

tion is space heating. Only 0.15% of natural gas is used as a vehicle transportation fuel.

Industrial, Commercial and Residential
Within the Industrial sector, there are opportu

nities for improved efficiency of the Industrial boiler fleet, replacing less

- efficient natural gas boilers with high

- efficiency, or super

- high efficiency boilers with conversion efficiencies up to 94%. There are also opportunities to improve the efficiency of natural gas use in process heating and to reduce process heating require

ments through changes in process technologies and material substitutions.
Our analysis suggests that conversion of coal

- fired boilers in the Industrial sector to high

- efficiency gas boilers could provide a
cost

- effective option for compliance with new hazardous air pollutant reductions and create significant CO 2 reduction opportunities at modest cost, with a potential to increase natural gas demand by up to 0.9 Tcf/year.
Natural gas and natural gas liquids (NGLs) are a principal feedstock in the chemicals industry and a growing source of hydrogen production for petroleum refining. Our analysis of selected cases indicates that a robust domestic market for natural gas and NGLs will improve the competitiveness of manufacturing industries dependent on these inputs.
Natural gas has significant advantages in the Residential and Commercial sectors due in part to its cleanliness and life cycle energy efficiency. However, understanding the comparative
cost

- effectiveness and CO 2 impacts of different energy options is complex. Comparison ofChapter 1: Overview and Conclusions 11 end use or “site” energy efficiencies can be misleading, since it does not take into account full system energy use and emissions (such as the efficiency and emissions of electricity generation). However, quantitatively account

ing for the full system impacts from the “source” can be challenging, requiring a complex end

- to

- end, full fuel cycle (FFC) analysis that is not generally available to the consumer or to the policy maker.
Consumer and policy maker choices are further complicated by the influence of local climatic conditions and regional energy markets. The primary energy mix of the regional generation mix fundamentally affects “site versus source” energy and emissions comparisons. And the local climate has a major influence on the best choice of heating and cooling systems, particu

larly the appropriate use of modern space conditioning technologies such as heat pumps. Consumer information currently available to consumers does not facilitate well

- informed decision making.
Expanded use of combined heat and power (CHP) has considerable potential in the Indus

trial and large Commercial sectors. However, cost, complexity and the inherent difficulty of balancing heat and power loads at a very small scale make residential CHP a much more difficult proposition.

MAJOR R ECO M M ENDATIONS I mproved energy e ffi ciency metrics, which allow consumers to accurately compare direct fuel and electricity end uses on a full fuel cycle basis, should be developed.

O ver time, these metrics should be tailored to account for geographical variations in the sources of electric power supply and local climate conditions. Transportation
The ample domestic supply of natural gas has stimulated interest in its use in transportation. There are multiple drivers: the oil

- natural gas price spread on an energy basis generally favors natural gas, and today that spread is at histori

cally high levels; an opportunity to lessen oil dependence in favor of a domestically supplied fuel, including natural gas

- derived liquid fuels with modest changes in vehicle and/or infra

structure requirements and reduced CO 2 emissions in direct use of natural gas.
Compressed natural gas (CNG) offers a signifi

cant opportunity in U.S. heavy

- duty vehicles used for short

- range operation (buses, garbage trucks, delivery trucks), where payback times are around three years or less and infrastructure issues do not impede development. However, for light passenger vehicles, even at 2010 oil

- natural gas price differentials, high incre

mental costs of CNG vehicles lead to long payback times for the average driver, so signifi

cant penetration of CNG into the passenger fleet is unlikely in the short term. Payback periods could be reduced significantly if the cost of conversion from gasoline to CNG could be reduced to the levels experienced in other parts of the world such as Europe.
LNG has been considered as a transport fuel, particularly in the long

- haul trucking sector. However, as a result of operational and infra

structure considerations as well as high incre

mental costs and an adverse impact on resale value, LNG does not appear to be an attractive option for general use. There may be an opportunity for LNG in the rapidly expanding segment of hub

- to

- hub trucking operations, where infrastructure and operational challenges can be overcome.12 MIT S T UDY O N T HE FU T URE OF N A T URAL GA S Energy density, ease of use and infrastructure considerations make liquid fuels that are stable at room temperature a compelling choice in the Transportation sector. The chemical conversion of natural gas to liquid fuels could provide an attractive alternative to CNG. Several pathways are possible, with different options yielding different outcomes in terms of total system CO 2 emissions and cost. Conversion of natural gas to methanol, as widely practiced in the chemi

cals industry, could provide a cost

- effective route to manufacturing an alternative, or supplement, to gasoline, while keeping CO 2 emissions at roughly the same level. Gasoline engines can be modified to run on methanol at modest cost.

MAJOR R ECO M M ENDATIONS T he U. S . government should consider revision to its policies related to CN G vehicles, including how aftermarket CN G conversions are certified, with a view to reducing up-front costs and facilitating CN G-gasoline capacity.

T he U. S . government should implement an open fuel standard that requires automobile manufacturers to provide tri-flex fuel (gasoline, ethanol and methanol) operation in light-duty vehicles. S upport for methanol fueling infrastructure should also be considered.

Infrastructure

The continental U.S. has a vast, mature and robust natural gas infrastructure, which includes: over 300,000 miles of transmission lines; numerous natural gas

- gathering systems; storage sites; processing plants; dis tribu tion pipelines and LNG import terminals.
Several trends are having an impact on natural gas infrastructure. These include changes in U.S. production profiles, with supplies generally shifting from offshore Gulf of Mexico back to onshore; shifts in U.S. population, generally from the Northeast and Midwest to the South and West and growth in global LNG markets, driven by price differences between regional markets.
The system generally responds well to market signals. Changing patterns of supply and demand have led to a significant increase in infrastructure development over the past few years with West to East expansions dominating pipeline capacity additions. Infrastructure limitations can temporarily constrain produc

tion in emerging production areas such as the Marcellus shale — but infrastructure capacity expansions are planned or underway. Demand increases and shifts in consumption and production are expected to require around $210 billion in infrastructure investment over the next 20 years.
Much of the U.S. pipeline infrastructure is old — around 25% of U.S. natural gas pipelines are 50 years old or older — and recent incidents demonstrate that pipeline safety issues are a cause for concern. The Department of Trans

portation (DOT) regulates natural gas pipeline safety and has required integrity management programs for transmission and distribution pipelines. The DOT also supports a small pipeline safety research program, which seems inadequate given the size and age of the pipe

line infrastructure.
Increased use of natural gas for power genera

tion has important implications for both natural gas and electric infrastructures, includ

ing natural gas storage. Historically, injections and withdrawals from natural gas storage have been seasonal. Increased use of natural gas for power generation may require new high

deliverability natural gas storage to meet more variable needs associated with power generation.Chapter 1: Overview and Conclusions 13 MAJOR R ECO M M ENDATIONS A nalysis of the infrastructure demands associated with potential shift from coal to gas-fired power should be undertaken. Pipeline safety technologies should be included in natural gas RD & D programs.

E ND USE E M ISSIONS VERSUS SYSTE M -WIDE E M ISSIONS
When comparing GHG emissions for different energy sources, attention should be paid to the entire system. In particular, the potential for leakage of small amounts of methane in the production, treatment and distribution of coal, oil and natural gas has an effect on the total GHG impact of each fuel type. The modeling analysis in Chapter 3 addresses the system

- wide impact, incorporating methane leakage from coal, oil and natural gas production, processing and transmission. In Chapter 5 we do not attempt to present detailed full

- system account

ing of CO 2 (equivalent) emissions for various end uses, although we do refer to its potential impact in specific instances.

The CO 2 equivalence of methane is conventionally based on a Global Warming Potential (GWP) 3 intended to capture the fact that each GHG has different radiative effects on climate and different lifetimes in the atmosphere. In our considerations, we follow the standard Intergovernmental Panel on Climate Change (IPCC) and EPA definition that has been widely employed for 20 years. Several recently published life cycle emissions analyses do not appear to be comprehensive, use common assumptions or recognize the progress made by producers to reduce methane emissions, often to economic benefit. We believe that a lot more work is required in this area before a common under

standing can be reached. Further discussion can be found in Appendix 1A. MAJOR R ECO M M ENDATIONS T he E P A and the U. S

. D epartment of E nergy ( DOE ) should co-lead a new e ff ort to review, and update as appropriate, the methane emission factors associated with natural gas production, transmission, storage and distribution. T he review should have broad-based stakeholder involvement and should seek to reach a consensus on the appropriate methodology for estimating methane emissions rates. T he analysis should, to the extent possible: (a) reflect actual emissions measurements; (b) address fugitive emissions for coal and oil as well as natural gas; and (c) reflect the potential for
cost-e ff ective actions to prevent fugitive emissions and venting of methane.

MARKETS AND GEO P OLITICS
The physical characteristics of natural gas, which create a strong dependence on pipeline transportation systems, have led to local markets for natural gas – in contrast to the global markets for oil.
There are three distinct regional gas markets: North America, Europe and Asia, with more localized markets elsewhere. The U.S. gas market is mature and sophisticated, and functions well, with a robust spot market. Within the U.S. market, the price of oil, (which is set globally) compared to the price of natural gas (which is set regionally) is very important in determining market share when there is the opportunity for substitution. Over the last decade or so, when oil prices have been high,the ratio of the benchmark West Texas Intermediate oil price to the Henry Hub natural gas price has been consistently higher than any of the standard rules of thumb.14 MIT S T UDY O N T HE FU T URE OF N A T URAL GA S International natural gas markets are in the early stages of integration, with many impedi

ments to further development. While increased LNG trade has started to connect these mar

kets, they remain largely distinct with respect to supply patterns, pricing and contract struc

tures, and market regulation. If a more inte

grated market evolves, with nations pursuing gas production and trade on an economic basis, there will be rising trade among the current regional markets and the U.S. could become a substantial net importer of LNG in future decades.
Greater international market liquidity would be beneficial to U.S. interests. U.S. prices for natural gas would be lower than under current regional markets, leading to more gas use in the U.S. Greater market liquidity would also contribute to security by enhancing diversity of global supply and resilience to supply disruptions for the U.S. and its allies. These factors ameliorate security concerns about import dependence.
As a result of the significant concentration of conventional gas resources globally, policy and geopolitics play a major role in the develop

ment of global supply and market structures. Consequently, since natural gas is likely to play a greater role around the world, natural gas issues will appear more frequently on the U.S. energy and security agenda. Some of the specific security concerns are:

s .ATURAL GAS DEPENDENCE INCLUDING THAT

of allies, could constrain U.S. foreign policy options, especially in light of the unique American international security responsibilities.

s .EW MARKET PLAYERS COULD INTRODUCE

impediments to the development of transparent markets. s #OMPETITION FOR CONTROL OF NATURAL GAS pipelines and pipeline routes is intense in key regions.

s ,ONGER SUPPLY CHAINS INCREASE THE VULNER

ability of the natural gas infrastructure.

MAJOR R ECO M M ENDATIONS T he U. S . should pursue policies that encourage the development of an e ffi cient and integrated global gas market with transparency and diversity of supply.

N atural gas issues should be fully integrated into the U. S . energy and security agenda, and a number of domestic and foreign policy measure should be taken, including:

t JOUFHSBUJOH FOFSHZ JTTVFT GVMMZ JOUP UIF

conduct of U. S . foreign policy, which will require multiagency coordination with leadership from the E xecutive O ffi ce of the President;

t TVQQPSUJOH UIF FõPSUT PG UIF *OUFSOBUJPOBM

E nergy A gency ( IEA ) to place more atten

tion on natural gas and to incorporate the large emerging markets (such as C hina, I ndia and Brazil) into the IEA process as integral participants;

t TIBSJOH LOPXIPX GPS UIF TUSBUFHJD

expansion of unconventional resources; and

t BEWBODJOH JOGSBTUSVDUVSF QIZTJDBM BOE

cyber-security as the global gas delivery system becomes more extended and interconnected.Chapter 1: Overview and Conclusions 15 RD & D
There are numerous RD&D opportunities to address key objectives for natural gas supply, delivery and end use:

s IMPROVE THE LONG TERM ECONOMICS OF RESOURCE

development as an important contributor to the public good;

s REDUCE THE ENVIRONMENTAL FOOTPRINT OF

natural gas production, delivery and use;

s EXPAND CURRENT USE AND CREATE ALTERNATIVE

applications for public policy purposes, such as emissions reductions and diminished oil dependence;

s IMPROVE SAFETY AND OPERATION OF NATURAL GAS

infrastructure;

s IMPROVE THE EFlCIENCY OF NATURAL GAS CONVER

sion and end

- use so as to use the resource most effectively.
Historically, RD&D funding in the natural gas industry has come from a variety of sources, including private industry, the DOE, and private/public partnerships. In tandem with limited tax credits, this combination of support played a major role in development of uncon

ventional gas. It has also contributed to more efficient end

- use, for example in the develop

ment of high

- efficiency gas turbines.
Today government funded RD&D for natural gas is at very low levels. The elimination of
rate

- payer funded RD&D has not been com

pensated by increased DOE appropriations or by a commensurate new revenue stream outside the appropriations process. The total public and public

- private funding for natural gas research is down substantially from its peak and is more limited in scope, even as natural gas takes a more prominent role in a carbon

constrained world. While natural gas can provide a cost

- effective bridge to a low carbon future, it is vital that efforts continue to improve the cost and efficiency of low or zero carbon technologies for the longer term. This will require sustained RD&D and subsidies of limited duration to encourage early deployment.

MAJOR R ECO M M ENDATIONS T he A dministration and C ongress should support RD & D focused on environmentally responsible domestic natural gas supply. T his should entail both a renewed DOE program, weighted towards basicresearch, and a complementary industryled program, weighted towards applied research, development and demonstration, that is funded through an assured funding stream tied to energy production, delivery and use. T he scope of the program should be broad, from supply to end-use.

S upport should be provided through RD & D , and targeted subsidies of limited duration, for low-emission technologies that have the prospect of competing in the long run. T his would include renewables, carbon capture and sequestration for both coal and gas generation, and nuclear power.16 MIT S T UDY O N T HE FU T URE OF N A T URAL GA S C ONCLUSION
Over the past few years, the U.S. has developed an important new natural gas resource that fundamentally enhances the nation’s long

- term gas supply outlook. Given an appropriate regulatory environment, which seeks to place all lower carbon energy sources on a level competitive playing field, domestic supplies of natural gas can play a very significant role in reducing U.S. CO 2 emissions, particularly in the electric power sector. This lowest cost strategy of CO 2 reduction allows time for the continued development of more cost

- effective low or zero carbon energy technology for the longer term, when gas itself is no longer sufficiently low carbon to meet more stringent CO 2 reduction targets. The newly realized abundance of low cost gas provides an enor

mous potential benefit to the nation, providing a cost effective bridge to a secure and low carbon future. It is critical that the additional time created by this new resource is spent wisely, in creating lower cost technology options for the longer term, and thereby ensuring that the natural gas bridge has a safe landing place in a low carbon future.

N OTES

1 One quadrillion Btu (or “quad”) is 1015 or 1,000,000,000,000,000 British thermal units. Since one standard cubic foot of gas is approximately 1,000 Btu, then 1 quad is approximately 1 Tcf of gas. 2 EIA 2009 Annual Energy Review, Figure 45.

3 Global

- warming potential (GWP) is a relative measure of how much heat a given greenhouse gas traps in the atmosphere.Chapter 2: Supply 17 

# Chapter 2: Supply

INTRODUCTION AND CONTEXT
In this chapter, we discuss various aspects of natural gas supply: how much natural gas exists in the world; at what rate can it be produced and what it will cost to develop. Following the introduction and definitions, we look at produc

tion history, resource volumes and supply costs for natural gas — first from a global perspective, and then focusing in more detail on the U.S., paying particular attention to the prospects for shale gas. We then discuss the science and technology of unconventional gas, the environ

mental impacts of shale gas development and finally the prospects for methane hydrates.

N ATURA L G A S AND T H E RECO V ER Y P ROCE SS
The primary chemical component of natural gas is methane, the simplest and lightest hydrocar

bon molecule, comprised of four hydrogen (H) atoms bound to a single carbon (C) atom. In chemical notation, this is expressed as CH 4 (the symbol for methane). Natural gas may also contain small proportions of heavier hydrocarbons: ethane (C 2 H 6 ); propane (C 3 H 8 ) and butane (C 4 H 10 ); these heavier components are often extracted from the producing stream and marketed separately as natural gas liquids (NGL). In the gas industry, the term “wet gas” is used to refer to natural gas in its raw unpro

cessed state, while “dry gas” refers to natural gas from which the heavier components have been extracted. Thermogenic 1 natural gas, which is formed by the application, over geological time, of enormous heat and pressure to buried organic matter, exists under pressure in porous rock formations thousands of feet below the surface of the earth. It exists in two primary forms: “associated gas” is formed in conjunction with oil, and is generally released from the oil as it is recovered from the reservoir to the surface — as a general rule the gas is treated as a by-product of the oil produc

tion process; in contrast, “non-associated gas” is found in reservoirs that do not contain oil, and is developed as the primary product. While associ

ated gas is an important source, the majority of gas production is non-associated; 89% of the gas produced in the U.S. is non-associated.
Non-associated gas is recovered from the forma

tion by an expansion process. Wells drilled into the gas reservoir allow the highly compressed gas to expand through the wells in a controlled manner, to be captured, treated and transported at the surface. This expansion process generally leads to high recovery factors from conventional, good-quality gas reservoirs. If, for example, the average pressure in a gas reservoir is reduced from an initial 5,000 pounds per square inch (psi) to 1,000 psi over the lifetime of the field, then approximately 80% of the Gas Initially In Place (GIIP) will be recovered. This is in contrast to oil, where recovery factors of 30% to 40% are more typical.
Gas is found in a variety of subsurface locations, with a gradation of quality as illustrated in the resource triangle in Figure 2.1.18 MIT S T UDY ON T HE FU T URE O F N A T URAL GA S Conventional resources exist in discrete, well-defined subsurface accumulations (reser

voirs), with permeability 2 values greater than a specified lower limit. Such conventional gas resources can usually be developed using vertical wells, and generally yield the high recovery factors described above.
By contrast, unconventional resources are found in accumulations where permeability is low. Such accumulations include “tight” sandstone formations, coal beds (coal bed methane or CBM) and shale formations. Unconventional resource accumulations tend to be distributed over a larger area than con

ventional accumulations and usually require advanced technology such as horizontal wells or artificial stimulation in order to be economi

cally productive; recovery factors are much lower — typically of the order of 15% to 30% of GIIP. The various resource types are shown schematically in Figure 2.2. Adapted from Holditch 2006 Figure 2.1 GIIP as a Pyramid in Volume and Quality. Conventional reservoirs are at the top of the pyramid. They are of higher quality because they have high permeability and require less technology for development and production. The unconventional reservoirs lie below the conventional reservoirs in this pyramid. They are more abundant in terms of GIIP but are currently assessed as recoverable resources — and commercially developed — primarily in North America. They have lower permeability, require advanced technology for production and typically yield lower recovery factors than conventional reservoirs.

Co nv entional Resource s

Uncon ve ntional Resource s High- Qualit y Reser v oirs

Low- Qualit y

Reser v oirs

T ight Ga s

Sands C oal Be d Methane Shale Ga s

Methane Hy drate s

V

olumeIncreasingTechnology/Decreasing RecoveryFactorChapter 2: Supply 19 R E S OURCE DE F INITION S
The complex cross-dependencies between geology, technology and economics mean that the use of unambiguous terminology is critical when discussing natural gas supply. In this study, the term “resource” will refer to the sum of all gas volumes expected to be recoverable in the future, given specific technological and economic conditions. The resource can be disaggregated into a number of sub-categories; specifically, “proved reserves,” “reserve growth” (via further development of known fields) and “undiscovered resources,” which represent gas volumes that are expected to be discovered in the future via the exploration process. Figure 2.3 illustrates how proved reserves, reserve growth and undiscovered resources combine to form the “technically recoverable resource,” that is, the total volume of natural gas that could be recovered in the future, using today’s technology, ignoring economic constraints. Figure 2.2 Illustration of Various Types of Gas Resource

Land sur fac e

C oal bed methane

Co nv entiona l associated ga s

T ight sand gas Sandstone Seal

Gas-rich shale Co nv entiona l non-associate d gas 

### Schematic geology of natural gas resource

Oil

Source: U.S. Energy Information Administration



## Gas resources are an economic concept — a function of many variables, in particular the cost of exploration, production and transportation relative to the price of sale to users.20 MIT S T UDY ON T HE FU T URE O F N A T URAL GA S The methodology used in analyzing natural gas supply for this study places particular emphasis in two areas:

1. Treating gas resources as an economic concept — recoverable resources are a function of many variables, particularly the ultimate price that the market will pay. A set of supply curves has been developed using the ICF 3 Hydrocarbon Supply Model with volumetric and fiscal input data supplied by ICF and MIT. These curves describe the volume of gas that is economically recover

able for a given gas price. These curves form a primary input to the integrated economic modelling in Chapter 3 of this report.

2. Recognizing and embracing uncertainty — uncertainty exists around all resource estimates due to the inherent uncertainty associated with the underlying geological, technological, economic and political conditions. The analysis of natural gas supply in this study has been carried out in a manner that frames any single point resource estimate within an associated uncertainty envelope, in order to illustratethe potentially large impact this everpresent uncertainty can have.

The volumetric data used as the basis of the analysis for both the supply curve development and the volumetric uncertainty analysis was compiled from a range of sources. In particular, use has been made of data from work at the United States Geological Survey (USGS), the Potential Gas Committee (PGC), the Energy Information Agency (EIA), the National Petroleum Council (NPC) and ICF International. Figure 2.3 Modified McKelvey Diagram, Showing the Interdependencies between Geology, Technology and Economics and Their Impacts on Resource Classes; Remaining Technically Recoverable Resources Are Outlined in RedIncreasing Economic ViabilitySub-economicEconomicTechnicallyRecoverableTechnicallyUnrecoverable Unconfirmed Discov ered/Identifie d Undiscov ered

Increasing Geologic Knowledge C onfirmed

Reser ve s C umulativ e Pr oduc tion Inf erred Reser v es/ Reser ve Growth Undiscov ered T

echnically Recov erable

Resource sChapter 2: Supply 21 G L O B A L SU PPLY

Production Trends
Over the past two decades, global production of natural gas has grown significantly, rising by almost 42% overall from approximately 74 trillion cubic feet (Tcf ) 4 in 1990 to 105 Tcf in 2009. This is almost twice the growth rate of global oil production, which increased by around 22% over the same period. Much of the gas production growth has been driven by the rapid expansion of production in areas that were not major gas producers prior to 1990. This trend is illustrated in Figure 2.4, which shows how growth in production from regions such as the Middle East, Africa and Asia & Oceania has significantly outpaced growth in the traditional large producing regions, includ

ing North America and Eurasia (primarily Russia).
Figure 2.5 compares the 1990 and 2009 annual production levels for the 10 largest gas-producing nations (as defined by 2009 output). In addition to demonstrating the overwhelming scale of the United States and Russia compared to other producing countries, this figure illustrates the very significant growth rates in other countries. The substantial growth of new gas producing countries over the period reflects the relative immaturity of the gas industry on a global basis outside Russia and North America, the expansion of gas markets and the rise in global cross-border gas trade.
Between 1993 and 2008, global cross-border gas trade almost doubled, growing from around 18 Tcf (25% of global supply) to around 35 Tcf (32% of global supply). Most of the world’s gas supply is transported from producing fields to market by pipeline. However, the increase in global gas trade has been accelerated by the growing use of Liquefied Natural Gas (LNG), which is made by cooling natural gas to around -162°C. Under these conditions, natural gas becomes liquid, with an energy density 600 times that of gas at standard temperature and pressure — and it can be readily transported over long distances in specialized ocean-going

Figure 2.4 Trends in Annual Global Dry Gas Production by Region between 1990 and 200919901991199219931994199519961997199819992000200120022003200420052006200720082009

120

100

80

60

40

20

0 Tcf of Gas

S. & C. America
Africa Europe
Middle East
Asia & Oceania
North America
Eurasia

Source: MIT; U.S. Energy Information Administration22 MIT S T UDY ON T HE FU T URE O F N A T URAL GA S Figure 2.5 Comparison of 1990 and 2009 Natural Gas Production Levels for the Top 10 Natural Gas Producing Nations (as defined by 2009 output)

0 5 10 15 20 25United StatesRussiaCanadaIranNorwayQuatarChinaAlgeriaNetherlandsSaudi Arabia 1990 2009 

### Tcf of Gas

Source: MIT; U.S. Energy Information Administration

Figure 2.6 Global Cross-Border Gas Trade

0 5 10 15 20 25 30 35


### 8.0

26.4 3.0

14.8

1993 2008 LNG Pipeline 

### Tcf of Gas

Source: MIT; U.S. Energy Information AdministrationChapter 2: Supply 23 LNG tankers. Over this 15-year period, global gas trade doubled, while LNG trade increased even more rapidly, as shown in Figure 2.6.

R E S OURCE S 5
Global natural gas resources are abundant. The mean remaining resource base is estimated to be 16,200 Tcf, with a range between 12,400 Tcf (with a 90% probability of being exceeded) and 20,800 Tcf (with a 10% probability of being exceeded). The mean projection is 150 times the annual consumption in 2009. With the exception of Canada and the U.S., this estimate does not include any unconventional supplies. The global gas supply base is relatively imma

ture; outside North America only 11% of the estimated ultimately recoverable conventional resources have been produced to date. Figure 2.7 depicts the estimated remaining recoverable gas resources, together with esti

mated uncertainty, 6 broken down by regions as defined by the Emissions Prediction and Policy Analysis (EPPA) model employed in Chapter 3 of this report. Figure 2.8 depicts the geographi

cal distribution of EPPA regions, together with the mean resource estimate for each region. The resources are comprised of three major components defined above: reserves, reserve growth and yet-to-find resources. For the U.S. and Canada, we have also included a fourth category, unconventional resources. As discussed later, due to the very high levels of uncertainty at this stage, we have not included unconven

tional resource estimates for other regions.

Source: MIT analysis based on data and information from: Ahlbrandt et al. 2005; United States Geological Survey 2010; National Petroleum Council 2003; United States Geological Survey n.d.; Potential Gas Committee 1990; Attanasi & Coburn 2004; Energy Information Administration 2009 Figure 2.7 Global Remaining Recoverable Gas Resource by EPPA Region, with Uncertainty



### Tc f of gas 0 1,000 2,000 3,000 4,000 5,000 6,00 0

Middle East
Russia United State s Africa Rest of Europe and Ce ntral Asia Canada Rest of Americas Europe Dy namic Asia Brazil Rest of East Asia
A ustralia & Oceania China India
Me xic o 

## 0 1000 2000 3000 4000 5000 6000 0.0 0.2 0.4 0.6 0.8 1.0 Middle East
Russia
United State s Africa Ce ntral Asia and

Rest of Europe Canada
Rest of Americas
EU27 and Nor wa y D ynamic Asia
Brazil
Rest of East Asia
A ustralia and Oceania
China
Me xic o

India Rese rv e Growth (Mean) T

otal Reser ve s

Co nv entional Undiscov ered Gas (Mean)
Uncon ve ntional Gas (Mean) Lo w RRR High RRR24 MIT S T UDY ON T HE FU T URE O F N A T URAL GA S Although resources are large, the supply base is concentrated geographically, with an estimated 70% in only three regions: Russia, the Middle East (primarily Qatar and Iran) and North America (where North American resources also include unconventional gas). By some measures, global supplies of natural gas are even more geographically concentrated than oil supplies. Political considerations and individual country depletion policies play at least as big a role in global gas resource development as geology and economics, and dominate the evolution of the global gas market.

Figure 2.8 Map of EPPA Regions, and Mean Resource Estimates

M iddle East [4670 T CF] Russia [3410 T CF]
Uni t ed S t a t es [2150 T CF]
A f r ica [1050 T CF]
Eas t e r n E u r ope and C e n t r al A sia [940 T CF] R est of East A sia [240 T CF]
A ust r ia and O c eania [225 T CF] China [210 T CF]
I ndia/ M e xi c o [95/50 T CF] Japan [~0 T CF] C anada [820 T CF]
R est of A me r icas [800 T CF]
EU27 and No r w a y [720 T CF]
D ynamic A sia [480 T CF]
B r azil [350 T CF] Source: EPPA, MITChapter 2: Supply 25 SU PPLY C O S T S 7
Figure 2.9 depicts a set of global supply curves, which describe the resources of gas that can be developed economically at given prices at the point of export. The higher the price, the more gas will ultimately be developed. Much of the global supply can be developed economically with relatively low prices at the wellhead or the point of export. 8 However, the cost of delivering this gas to market is generally considerably higher.
In contrast to oil, the total cost of delivering gas to international markets is strongly influenced by transportation costs, either via long-distance pipeline or as LNG. Transportation costs will obviously be a function of distance, but by way of illustration, resources that can be economically developed at a gas price of $1 or $2/million British thermal units (MMBtu) may well require an additional $3 to $5/MMBtu of transport costs to get to their ultimate destination. These high transportation costs are also a significant factor in the evolution of the global gas market.
Figure 2.10 depicts the mean gas supply curves for those EPPA regions that contain significant gas resources. Again, this illustrates the significant concentration of gas resources in the world. 

## In contrast to oil, the total cost of getting gas to international markets is strongly influenced by the cost of transportation — a significant factor in the evolution of the global gas market.

Figure 2.9 Global Gas Supply Cost Curve, with Uncertainty; 2007 Cost Base

20.00

18.00

16.00

14.00

12.00

10.00

8.00

6.00

4.00

2.00

0 Breakev en gas price at point of expor t: $/MMBtu

Tc f of gas 0 3,000 6,000 9,000 12,000 15,000 18,000 Lo w Mean High Example LNG value chain
c osts incurred during gas deliv er y $/MMBtu Liquefac tion $2.15 Shipping $1.25 Regasi ! cation $0.70
T

otal $4.10

0 5000 10000 15000 20000

0.0 0.2 0.4 0.6 0.8 1.0 Lo w 12,400 High 20,800 V

olumetric un ce rt ainty aroun d mean of 16,200 Tc f

Source: MIT; ICF Global Hydrocarbon Supply Model26 MIT S T UDY ON T HE FU T URE O F N A T URAL GA S U NCON V ENTIONA L R E S OURCE S 9

Outside of Canada and the U.S., there has been very little development of the unconventional gas supply base — indeed there has been little need when conventional resources are so abundant. But due to this lack of development, unconventional resource estimates are sparse and unreliable.
Based on an original estimate by Rogner 10 , there may be of the order of 24,000 Tcf of unconventional GIIP outside North America. Applying a nominal 25% recovery factor, this would imply around 6,000 Tcf of unconven

tional recoverable resources. However, these global estimates are highly speculative, almost completely untested and subject to very wide bands of uncertainty. There is a long-term need for basin-by-basin resource evaluation to provide credibility to the GIIP estimates and, most importantly, to establish realistic estimates of recoverable resource volumes and costs 11

. Given the concentrated nature of conventional supplies and the high costs of long-distance transportation, there may be considerable strategic and economic value in the development of unconventional resources in those regions that are currently gas importers, such as Europe and China. It would be in the strategic interest of the U.S. to see these indigenous supplies developed. As a market leader in this technol

ogy, the U.S. could play a significant role in facilitating this development.

RECOMMENDATION U.S. policy should encourage the strategic development of unconventional gas supplies in regions which currently depend on imported gas, in particular, E urope and C hina. 5,000 4,500 4,000 3.500 3,000 2,500 2,000 1,500 1,000 500 0 $20.00

$15.00

$10.00

$5.00

$0

Africa
Australia and Oceania
Brazil
China Dynamic Asia Europe India
Mexico Middle East Rest of Americas Rest of East Asia Rest of Europe and Central Asia
Russia Breakeven Gas Price $MMBtu Africa
Australia and Oceania
Brazil
China Dynamic Asia Europe India
Mexico Middle East
North America Rest of Americas Rest of East Asia Rest of Europe and Central Asia
Russia Figure 2.10 Global Gas Supply Cost Curve by EPPA Region; 2007 Cost Base

Source: MIT; ICF Global Hydrocarbon Supply ModelChapter 2: Supply 27 UNITED S TATE S S U PPLY

Production Trends
There is significant geographical variation in U.S. natural gas production levels. For the purposes of this discussion of U.S. production, we will use the U.S. EIA pipeline regions (Figure 2.11).
Natural gas production in the U.S. has tradi

tionally been associated with the Southwest region and the Gulf of Mexico. However, significant production also takes place in Alaska and in the Central region. In the case of Alaska, the vast majority of the gas is associated with oil production on the North Slope, and due to the lack of an export mechanism, this gas is re-injected to enhance recovery from Alaskan oil fields. These gas production volumes are therefore not included in the national gas production figures reported by the EIA. Small volumes of gas are exported from Alaska to Japan as LNG.
Figure 2.12 illustrates the regional breakdown of dry natural gas production in the U.S. since 2000. Some level of production occurs in all eight regions, but the dominance of the Southwest, Gulf of Mexico and Central regions is clearly shown. The dynamics of the produc

tion levels across these major regions have differed appreciably over the past decade. In the Southwest, the largest gas producing region, annual production levels remained relatively flat at about 9.3 Tcf from 2000 to 2005. Since 2005, output from the region has increased, growing by 21% to 11.4 Tcf in 2008. Much of this growth in the latter half of the decade is the result of rapid expansion in the production of gas from shale plays.

Figure 2.11 EIA Natural Gas Pipeline Regions for the L48 States; the State of Alaska and the U.S. O ff shore Territory in the Gulf of Mexico Form Two Additional Regions

Central

Western WA

Southwest Midwest Northeast

Southeast ME

VT NH MA

RI CT

DE PA NY

NJ

MD WV VA MN

WI MI

OH IL IN

KY

SC TN

AL MS GA

FL NC

LA NM AR OK

TX IA

MO KS NE SD ND MT

WY

UT CO OR
ID

AZ CA NV

Source: U.S. Energy Information Administration28 MIT S T UDY ON T HE FU T URE O F N A T URAL GA S Since 2000, the Central region has seen the greatest percentage growth in production among U.S. regions. Annual dry gas output has risen from 2.6 Tcf to 4.5 Tcf, an overall increase of 75%. Unlike the Southwest region, produc

tion from the Central region has grown con

tinuously since 2000, with output increasing from all resource types. In marked contrast, gas output from offshore fields in the Gulf of Mexico has fallen dramatically from approxi

mately 5 Tcf in 2000 to 2.4 Tcf in 2008, the result of fewer new wells being brought online in the Gulf to replace those older wells that are now in decline or have been taken off produc

tion. This decline is an indication of the maturity of the conventional resource base in the Gulf of Mexico. PRODUCTION T REND S BY R E S OURCE TYP E IN T H E U NITED STATE S
In a global context, U.S. gas production by type is extremely diverse. Both conventional and unconventional gas output is significant, with the contribution of unconventional gas growing steadily year-on-year.
Figure 2.13a plots contributions to production from conventional, unconventional and associated gas. This breakdown illustrates the marked shift towards unconventional resources that has been a feature of gas production in the U.S. over the past decade and more. In 2000, the combined gross production of conventional and associated gas in the L48 states was 14.6 Tcf (71% of total output). By 2009, the combined conventional and associated output had fallen to 11.4 Tcf (52% of the total). In concert with this fall in conventional and associated gas production, there has been continuous expan

sion in the production of unconventional gas, with approximately 4.5 Tcf more unconven

tional gas being produced in 2009 than in 2000. Figure 2.12 Regional Breakdown of Annual Dry Gas Production in the U.S. between 2000 and 2009

Source: MIT; U.S. Energy Information Administration 

### Tcf of Gas

0 2 4 6 8 10 12 14 16 18 20 22

2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 Western
Southwest
Southeast
Northeast
Midwest
GOM
Central
AlaskaChapter 2: Supply 29 Historically, tight gas has been the most signifi

cant source of unconventional gas production in the U.S., and is likely to remain so for some time. Tracking tight gas production can be difficult because it can exist in a continuum with conventional gas. However, a review of output from known tight plays shows a growth in annual output from 4.5 Tcf to 5.6 Tcf between 2000 and 2009, an increase from 21% to 25% of total gross production as shown in Figure 2.13b. Commercial production of CBM began at the end of the 1980s, and grew sub

stantially during the 1990s from an output of 0.2 Tcf in 1990 to 1.3 Tcf in 1999. This growth moderated during the last decade, with 2009 CBM output standing at 1.92 Tcf or 9% of the total.
Aside from the fall in conventional production, the most striking feature of the gas production in the U.S. this past decade has been the emergence of shale gas. Although shale resources have been produced in the U.S. since 1821, the volumes have not been significant. This situation changed fundamentally during the past decade as technological advances enabled production from shales previously considered uneconomical. Expansion in shale gas output is illustrated in Figures 2.13a and 2.13b. From 2000 to 2009, the contribution of shale gas to overall production grew from 0.1 Tcf, or less than 1%, to 3.0 Tcf, or nearly 14%. This growth is all the more remarkable in that 80% of it was driven by one play, the Barnett shale, located in Texas’ Fort Worth Basin. Activity in other shale plays has also been increasing, with appreciable volumes now being produced from the Fayetteville and Woodford shales in the Arkoma Basin, the Haynesville shale in the East Texas Basin and as of the end of 2009, the Marcellus shale in the Appalachian Basin. Figure 2.13a Breakdown by Type of Annual Gross Gas Production in the L48 U.S. between 2000 and 2009 Figure 2.13b Percentage Breakdown by Type of Gross Gas Production in the L48 U.S. in 2000 and 2009

Source: MIT; HPDI production database Tcf of Gas

2001 2000 2009 2003 2005 2007 2009 55% 41% 16% 7%

21% 1%

11% 9% 14%

25% Shale
CBM Tight
Associated
Conventional

0 5 10 15 20 2530 MIT S T UDY ON T HE FU T URE O F N A T URAL GA S U. S . R E S OURCE S 12

Table 2.1 illustrates mean U.S. resource esti

mates from a variety of resource assessment authorities. These numbers have tended to grow over time, particularly as the true poten

tial of the unconventional resource base has started to emerge over the past few years.
For this study, we have assumed a mean remaining resource base of around 2,100 Tcf. This corresponds to approximately 92 times the annual U.S. consumption of 22.8 Tcf in 2009. We estimate the low case (with a 90% probabil

ity of being met or exceeded) at 1,500 Tcf, and the high case (with a 10% probability of being met or exceeded) at 2,850 Tcf. Around 15% of the U.S. resource is in Alaska, and full development of this resource will require major pipeline construction to bring the gas to market in the L48 states. Given the abundance of L48 supplies, development of the pipeline is likely to be deferred yet again, but this gas represents an important resource for the future.

In the L48, some 55% to 60% of the resource base is conventional gas, both onshore and offshore. Although mature, the conventional resource base still has considerable potential. Around 60% of this resource is comprised of proved reserves and reserve growth, with the remainder — of the order of 450 to 500 Tcf — from expected future discoveries.

NPC USGS/MMS PGC ICF (2003) (Various Years) (2006) (2008) (2009) L48

Conventional 691 928
966 869 693 Tight 175 190 174 Shale 35 85 616 631 CBM 58 71 108 99 65 Total L48 959 1,274 1,074 1,584 1,563 Alaska

Conventional 237 357
194 194 237 Tight

– – Shale

– – – – CBM 57 18 57 57 57 Total Alaska 294 375 251 251 294 U.S.

Conventional 929 1,284 1,160 1,063 930 Tight 175 190 174 Shale 35 85 616 631 CBM 115 89 165 156 122 Total U.S. 1,254 1,648 1,325 1,835 1,857 Proved Reserves 184 245 204 245 245 Total (Tcf) 1,438 1,893 1,529 2,080 2,102

Source: National Petroleum Council 2003; United States Geological Survey 2010; Minerals Management Service 2006; Potential Gas Committee 2007; Potential Gas Committee 2009; Energy Information Administration 2009 Table 2.1 Tabulation of US Resource Estimates by Type, from Di ff erent SourcesChapter 2: Supply 31 Figure 2.14a represents the supply curves for the aggregate of all U.S. resources, depicting the mean estimate and the considerable range of uncertainty. Figure 2.14b illustrates the mean supply curves, broken down by resource type. It clearly shows the large remaining conventional resource base, although it is mature and some of it will require high gas prices to become eco

nomical to develop. These curves assume current technology. In practice, future technology development will enable these costs to be driven down over time, allowing a larger portion of the resource base to be economically developed.
Figure 2.14b also demonstrates the consider

able potential of shale supplies. Using a 2007 cost base, a substantial portion of the estimated shale resource base is economic at prices between $4/MMBtu and $8/MMBtu. As we see in the current U.S. gas markets, some of the shale resources will displace higher-cost con

ventional gas in the short to medium term, exerting downward pressure on gas prices. Despite the relative maturity of the U.S. gas supply, estimates of remaining resources have continued to grow over time — with an acceler

ating trend in recent years, mainly attributable to unconventional gas, especially in the shales.
The PGC, which evaluates the U.S. gas resource on a biannual cycle, provides perhaps the best historical basis for looking at resource growth over time. According to this data, remaining resources have grown by 77% since 1990, despite a cumulative production volume during that time of 355 Tcf.
As a subset of this growth process, the appli

cation of horizontal drilling and hydraulic fracturing technology to the shales has caused resource estimates to grow over a five-year period from a relatively minor 35 Tcf (NPC, 2003), to a current estimate of 615 Tcf (PGC, 2008), with a range of 420 to 870 Tcf. This NPC USGS/MMS PGC ICF (2003) (Various Years) (2006) (2008) (2009) L48

Conventional 691 928
966 869 693 Tight 175 190 174 Shale 35 85 616 631 CBM 58 71 108 99 65 Total L48 959 1,274 1,074 1,584 1,563 Alaska

Conventional 237 357
194 194 237 Tight

– – Shale

– – – – CBM 57 18 57 57 57 Total Alaska 294 375 251 251 294 U.S.

Conventional 929 1,284 1,160 1,063 930 Tight 175 190 174 Shale 35 85 616 631 CBM 115 89 165 156 122 Total U.S. 1,254 1,648 1,325 1,835 1,857 Proved Reserves 184 245 204 245 245 Total (Tcf) 1,438 1,893 1,529 2,080 2,102

Source: National Petroleum Council 2003; United States Geological Survey 2010; Minerals Management Service 2006; Potential Gas Committee 2007; Potential Gas Committee 2009; Energy Information Administration 2009 Figure 2.14a Volumetric Uncertainty of U.S. Gas Supply Curves; 2007 Cost Base

40.00

36.00

32.00

28.00

24.00

20.00

16.00

12.00

8.00

4.00

0 Breakev en Gas P ric e $/MMBtu

Tc f of gas 0 500 1,000 1,500 2,000 2,500 3,000 Lo w Mean High

0 500 1000 1500 2000 2500 3000 0.0 0.2 0.4 0.6 0.8 1.0

Don ’t Use This One , has all data, real one is on “ char t to cut ” Figure 2.14b Breakdown of Mean U.S. Gas Supply Curve by Type; 2007 Cost Base

40.00

36.00

32.00

28.00

24.00

20.00

16.00

12.00

8.00

4.00

0 Breakev en Gas P ric e $/MMBtu

Tc f of gas 0 100 200 300 400 500 600 700 800 900 1,000 Co nv entional T igh t Shale CBM

0 200 400 600 800 1000 1200 0.0 0.2 0.4 0.6 0.8 1.0

Do n’ t Use This On e Source: MIT; ICF North American Hydrocarbon Supply Model Source: MIT; ICF North American Hydrocarbon Supply Model32 MIT S T UDY ON T HE FU T URE O F N A T URAL GA S 

## According to Potential Gas Committee data, U.S. natural gas remaining resources have grown by 77% since 1990, a testament to the power of technology, and an illustration of the large uncertainty inherent in all resource estimates. resource growth is a testament to the power of technology application in the development of resources, and also provides an illustration of the large uncertainty inherent in all resource estimates.

The new shale plays represent a major contribution to the resource base of the U.S. However, it is important to note that there is considerable variability in the quality of the resources, both within and between shale plays. This variability in performance is incorporated in the supply curves on the previous page, as well as in Figure 2.15. Figure 2.15a shows initial production and decline data from three major U.S. shale plays, illustrating the substantial differences in average well performance between the plays. Figure 2.15b shows a prob

ability distribution of initial flow rates from the Barnett formation. While many refer to shale development as more of a “manufacturing process,” where wells are drilled on a statistical basis — in contrast to a conventional explora

tion, development and production process, where each prospective well is evaluated on an individual basis — this “manufacturing” still occurs within the context of a highly variable subsurface environment.

Figure 2.15a Illustration of Variation in Mean Production Rates between Three Shale Plays

9,000
8,000
7,000
6,000
5,000
4,000
3,000
2,000
1,000

0 Pr oduc tion Rate Mcf/da y (30- day av erage)

Y ear Haynesville Ma rcellus Barnett

0 1 2 3 4 5

0 500 1000 1500 2000 2500 3000 0.0 0.2 0.4 0.6 0.8 1.0

0 2000 4000 6000 8000 10000 Figure 2.15b Illustration of Variation in Initial Production Rates of 2009 Vintage Barnett Wells

0.12

0.10

0.08

0.06

0.04

0.02

0 IP Rate Pr obabilit y (Barnett 2009 W ell Vi ntage)

IP Rate Mcf/da y (30- day avg) 0 1,000 2,000 3,000 4,000 5,000

IP Rate Pr obabilit y (Barnett ’09 W ell Vi ntage)

0 500 1000 1500 2000 2500 3000 0. 0 0. 2 0. 4 0. 6 0. 8 1. 0

0.00 0.02 0.04 0.06 0.08 0.10 0.12 1,000 Mcf/day 250 Mcf/day Source: MIT analysis; HPDI production database and various industry sources Source: MIT analysis; HPDI production database and various industry sourcesChapter 2: Supply 33 This high level of variability in individual well productivity clearly has consequences with respect to the variability of individual well economic performance. 13 This is illustrated in Table 2.2, which shows the variation in break

even gas price as a function of initial productiv

ity for the five major U.S. shale plays. The P20 30-day initial production rate represents the rate that is equaled or exceeded by only 20% of the wells completed in 2009; the P80 represents the initial rate equaled or exceeded by 80% of completed wells.
Another major driver of shale economics is the amount of hydrocarbon liquid produced along with gas. The results in Table 2.2 assume dry gas with no liquid co-production; however, some areas contain wet gas with appreciable amounts of liquid, which can have a consider

able effect on the breakeven economics — par

ticularly if the price of oil is high compared to the price of gas.
The liquid content of a gas is often measured in terms of the “condensate ratio,” expressed in terms of barrels of liquid per million cubic feet of gas (bbls/MMcf). Figure 2.16 shows the change in breakeven gas price for varying condensate ratios in a typical Marcellus well, 14 assuming a liquids price of $80/bbl. It can be seen that for a condensate ratio in excess of approximately 50 bbls/MMcf in this particular case, the liquid production alone can provide an adequate return on the investment, even if the gas were to realize no market value.

Barnett Fayetteville Haynesville Marcellus Woodford
IP Mcf/d BEP $/Mcf IP Mcf/d BEP $/Mcf IP Mcf/d BEP $/Mcf IP Mcf/d BEP $/Mcf IP Mcf/d BEP $/Mcf
P20 2700 $4.27 3090 $3.85 12630 $3.49 5500 $2.88 3920 $4.12
P50 1610 $6.53 1960 $5.53 7730 $5.12 3500 $4.02 2340 $6.34
P80 860 $11.46 1140 $8.87 2600 $13.42 2000 $6.31 790 $17.04 Table 2.2 Full-Cycle 2009 Well Vintage P20, P50 and P80 30-Day Average Initial Production (IP) Rates and Breakeven Prices (BEP) for Each of the Major U.S. Shale Plays Assuming Mid Case Costs

Source: MIT analysis34 MIT S T UDY ON T HE FU T URE O F N A T URAL GA S The effects described above create an interest

ing dynamic in U.S. gas supply. Gas prices have been driven to low levels in 2009 and 2010, at least in part as a result of the abundance of relatively low-cost shale gas. Meanwhile oil prices, determined by global market forces, have remained high. This has led producers to seek liquid rich gas plays, such as certain areas of the Marcellus or the Eagle Ford play in Texas, where condensate ratios can be well in excess of 100 bbl/MMcf. These plays then enable more gas production, even at low gas prices, thus putting further downward pressure on gas prices.
In addition to understanding the resource volumes, it is important to understand the contribution that the new shale resources could make to the overall production capacity within the U.S. Figure 2.17 indicates how production from the top five shale plays might grow, if drilling were to continue at 2010 levels for the next 20 years. This illustrates the very significant production potential of the shale resource. 15 The current rapid growth in shale production can continue for some time — but in the longer run produc

tion growth tapers off as high initial produc

tion rates are offset by high initial decline rates, and the quality of drilling prospects declines as the plays mature.
The large inventory of undrilled shale acreage, together with the relatively high initial produc

tivity of many shale wells, allows a rapid production response to any particular drilling effort, provided that all wells can be completed and tied in. However, this responsiveness will change over time as the plays mature, and significant drilling effort is required just to maintain stable production against relatively high inherent production decline rates. Figure 2.16 Estimated Breakeven Gas Price ($/MMBtu) for a Mean Performing 2009 Vintage Marcellus Shale Well, with Varying Condensate Ratio (bbl/MMcf), Assuming a Liquids Price of $80/bbl Breakeven gas price $/MMBtu

Condensate Ratio bbl/MMcf 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5

0 5 10 15 20 25 30 35 40 45 50

Source: MIT analysisChapter 2: Supply 35 UNCON V ENTIONA L G A S S CIENCE AND TEC H NO L O GY 16
Each unconventional gas resource type — tight gas, CBM and shale — presents it own production challenges, although they also share some common characteristics. In particular, all three types have low intrinsic permeability within the rock matrix itself — and thus require enhancement of the connectivity between the reservoir and the wellbore to enable gas flow at commercial rates. A second common characteristic is that the resources tend to be distributed over large geographical areas, saturating pore space often hundreds of square kilometres in areal extent, rather than within the tightly defined boundaries of conventional gas reservoirs. This means that exploration risk is very low; the challenges lie in achieving commercial production rates.
Shale resources represent a particular challenge, because of their complexity, variety and lack of long-term performance data. In conventional reservoirs, there is a long history of production from a wide variety of depositional, mineral

ogical and geomechanical environments, such that analogues can be developed and statistical predictions about future performance can be developed. This is not yet the case in the shale plays.
Gas shales refer to any very fine-grained rock capable of storing significant amounts of gas. Gas may be present as free gas stored in the natural fracture and macroporosity, adsorbed onto the kerogen 17 and internal surfaces of the pores or dissolved in the kerogen and bitumen. The highly variable definition of gas shales has led to uncertainty in defining controlling factors that constitute an economic develop

ment. Values of the key parameters used in identifying potential shale resources vary widely between shale plays, making it difficult to apply analogues and expand shale gas exploration and development outside estab

lished basins. Figure 2.17 Potential Production Rate that Could Be Delivered by the Major U.S. Shale Plays up to 2030 — Given 2010 Drilling Rates and Mean Resource Estimates

30

25

20

15

10

5

0Bcf/day

2000 2005 2010 2015 2020 2025 2030 Ma rcellu s Haynesville W ood fo rd

Barnett Fa y etteville

0.0 0.2 0.4 0.6 0.8 1.0 Source: MIT analysis36 MIT S T UDY ON T HE FU T URE O F N A T URAL GA S Production in shales is a multi-scale and multi-mechanism process. Fractures provide the permeability for gas to flow, but contribute little to the overall gas storage capacity. The porosity of the matrix provides most of the storage capacity, but the matrix has very low permeability. Gas flow in the fractures occurs in a different flow regime than gas flow in the matrix. Because of these differing flow regimes, the modeling of production performance in fractured shale formations is far more complex than for conventional reservoirs, and scaling modeling results up to the field level is very challenging. This in turn makes it difficult to confidently predict production performance and devise optimal depletion strategies for shale resources.

Production behavior in shale wells is marked by a rapid decline from initial production rates, as seen in Figure 2.15a. Early gas production is dominated by free gas depleted from the fractures and the macroporosity. This rapid initial decline is followed by a long term, much slower decline. As the pressure is lowered, gas desorbs from the organic matter in the matrix and diffuses into the fracture system. During this stage, desorption and diffusion through the matrix drive production. The long-term production behavior of a shale gas well is dependent on the time scale of flow from the matrix relative to flow in the fracture network.
In addition to the complexities of modelling performance, core analysis techniques devel

oped for conventional gas, CBM and tight gas do not work well in shale reservoirs, because they implicitly assume that the same production mechanisms are applicable. The determination of initial parameters such as permeability, porosity and initial gas-in-place can be misleading, contributing to uncertainty in resource size and production performance. In order to ensure the optimal development of these important national assets, it is necessary to build a comprehensive understanding of geochemistry, geological history, multiphase flow characteristics, fracture properties and production behavior across a variety of shale plays. It is also important to develop tools that can enable the scaling up of pore-level physics to reservoir-scale performance predic

tion, and make efforts to improve core analysis techniques to allow accurate determination of the recoverable resource.

RECOMMENDATION T he U.S. D epartment of E nergy ( DOE ) should sponsor additional Research and D evelopment (R& D ), in collaboration with industry and academia, to address some of the fundamental challenges of shale gas science and technology, with the goal of ensuring that this national resource is exploited in the optimal manner.

Resource assessment

It is in the national interest to have the best possible understanding of the size of the U.S. natural gas resource. For conventional reser

voirs, statistically based resource assessment methodologies have been developed and tested over many years. In contrast, the assessment methodology for the “continuous” unconven

tional resources is less well developed. There would be real benefit in improving the method

ology for unconventional resource assessments.

RECOMMENDATION T he USGS should continue, and even accelerate, its e ff orts to develop improved assessment methodologies for unconventional resources.Chapter 2: Supply 37 Technology
The development of unconventional resources in general, and shale resources in particular, has been enabled by the application of existing technology — horizontal drilling and hydraulic fracturing — in a new setting. The objective is to create very large surface areas in the forma

tion that are in communication with the wellbore. Horizontal wells place 4,000 feet or more of well directly into the formation, while multistage fracturing along the horizontal section then creates additional surface area in communication with the wellbore.
Improvements in drilling and fracturing performance are currently rapid, coming from improved know-how rather than specific technology breakthroughs. The repetitive nature of the shale drilling and completion process provides an ideal environment for continuous improvement of drilling and completion times, and fracturing performance. These improve

ments can serve to enhance well economics and increase the ultimate resource base.
There are a number of areas of technology development that could enhance unconven

tional gas recovery in the longer term:

s $RILLING

 UNCONVENTIONAL RESOURCES REQUIRE

a high well density for full development. Technology that can reduce well costs and increase wellbore contact with the reservoir can make a significant impact on costs, production rates and ultimate recovery. Multi-lateral drilling, whereby a number of horizontal sections can be created from a single vertical wellbore, and coiled tubing drilling to decrease costs represent potential options for future unconventional gas development.

s #/ 2 enhanced recovery — simultaneous

recovery of natural gas while sequestering CO 2 provides an interesting, although as yet unproven, possibility for enhancing gas recovery while reducing environmental footprint. In enhanced CBM production, CO 2 injected into the reservoir preferentially displaces methane molecules, allowing for enhanced gas production while storing CO 2 permanently in the subsurface. While pilot projects have successfully demonstrated enhanced recovery from this technique, there are significant challenges associated with making this a commercial-scale process.

s 3EISMIC TECHNIQUES

 MICRO
SEISMIC TECH

niques are now commonly used to estimate the length and orientation of induced fractures in the reservoir during fracturing operations; this technique is useful for improving fracturing effectiveness. At a more macroscopic level, there is a need to develop seismic techniques that allow the characteri

sation of large areas, to identify formation “sweet spots,” natural fracture orientation and other properties that would be invaluable in improving overall resource development.

SH A L E G A S EN V IRONMENTA L CONCERN S
Background
The rapid development of shale gas resources in the U.S. over the past few years has aroused concern, and a perception in some quarters that this development is causing significant environ

mental problems. A good deal of attention has been focused on the high-volume hydraulic fracturing that is an essential component of shale gas development, with a major concern being that the fracturing process risks injecting toxic fracture fluids into shallow groundwater aquifers, which are in many cases the source of potable water for public use. More broadly, there are concerns about water management and in particular the proper disposal of poten

tially toxic wastewater from the fracturing procedure.

These concerns have led to restrictions on drilling in some areas and proposed regulatory action. Activity is currently restricted in poten

tially productive areas of the Marcellus shale in the Delaware River Basin, New York State and Pennsylvania State Forest land. The U.S.38 MIT S T UDY ON T HE FU T URE O F N A T URAL GA S Figure 2.18 Typical Shale Well Construction (Not to Scale)

High Qualit y

Reser v oirs

Lo w Qualit y Reser v oirs

T ight Ga s

Sands Shale Ga s Ma rcellu s Haynesville W ood fo rd

Barnet t Fa y etteville C onduc tor Casing

Sur face Casing C emen t

Drilling Mud

C emen t In termediate Casing

Pr oduc tion Casing

Pr oduc tion T ubing Kicko ff P oin t 100

—

1000

—

2000

—

7100

—

Pr oduc tion Z one Salt W ater Zone A quif er F eet Below Sur fac e

Source: Based on Modern Shale Gas Development in the United States – a Primer

Environmental Protection Agency (EPA) is conducting an extensive review of hydraulic fracturing, and legislation in the form of the Fracturing Responsibility and Awareness of Chemicals (FRAC) Act was introduced in the 2009–2010 Congress. 18
The Shale Drilling and Completion Process
In order to appreciate the risks associated with shale development, and to understand appro

priate risk mitigation techniques, it is helpful to understand the major steps involved in well construction:

1. Well permitting — states require an operator to obtain a permit to drill a well.

2. Well site construction — typically involves cleaning and grading an area of around four acres in the case of a single well site, or five to six acres in the case of a multi-well site. 3. Drilling and casing — as shown in Figure 2.18, casing is cemented into the well at various stages in order to maintain the integrity of the wellbore, and to ensure that fluids within the various strata are contained within those strata. The drilling and casing process usually entails several stages:

(i) Drill and set conductor casing — large diameter casing set at shallow depths.

(ii) Drill through shallow freshwater zones, set and cement surface casing — the most critical phase with respect to the protection of groundwater resources.

(iii) Drill and cement intermediate casing.

(iv) Drill and cement production casing.Chapter 2: Supply 39 4. Perforate and fracture the well, usually in multiple stages.

5. Flowback fracture fluid.

6. Place well into production.

Potential Risks

With over 20,000 shale wells drilled in the last 10 years, the environmental record of shale gas development has for the most part been a good one. Nevertheless, it is important to recognize the inherent risks of the oil and gas business and the damage that can be caused by just one poor operation; the industry must continuously strive to mitigate risk and address public

con cerns. Particular attention should be paid to those areas of the country which are not accustomed to oil and gas development, and where all relevant infrastructure, both physical and regulatory, may not yet be in place. In this context, the Marcellus shale, which represents 35% to 40% of the U.S. shale resource, is the primary concern.
Within the stages of well construction outlined above, the primary risks are as follows:

1. Contamination of groundwater aquifers with drilling fluids or natural gas while drilling and setting casing through the shallow zones.

2. On-site surface spills of drilling fluids, fracture fluids and wastewater from fracture flowbacks. 3. Contamination as a result of inappropriate off-site wastewater disposal.

4. Excessive water withdrawals for use in high-volume fracturing.

5. Excessive road traffic and impact on air quality.
Before examining these risks in more detail, it is instructive to look at data that attempt to summarize available information on recorded incidents relating to gas well drilling in the U.S. L48 onshore. It is beyond the scope of this study to examine multiple state archives to

review individual well incident reports. Instead, to provide a high-level view we have extracted and combined the results from a number of reports that have reviewed drilling-related incidents in the U.S. over the past few years. Table 2.3 indicates the results of this analysis, while Appendix 2E provides a fuller description of the data set. The data set does not purport to be comprehensive, but is intended to give a sense of the relative frequency of various types of incidents. 

## With over 20,000 shale wells drilled in the last 10 years, the environmental record of shale gas development has for the most part been a good one — but it is important to recognize the inherent risks and the damage that can be caused by just one poor operation.

Type of Incident Number Reported Fraction of Total Groundwater contamination by natural gas or drilling fluid 20 47% On-site surface spills 14 33% O ff -site disposal issues 4 9% Water withdrawal issues 2 4% Air quality 1 2% Blowouts 2 4% Table 2.3 Widely Reported Incidents Involving Gas Well Drilling; 2005 – 200940 MIT S T UDY ON T HE FU T URE O F N A T URAL GA S Of the 43 widely reported incidents, almost half appear to be related to the contamination of shallow water zones primarily with natural gas. Another third of reported incidents pertain to on-site surface spills. In the studies surveyed, no incidents are reported which conclusively demonstrate contamination of shallow water zones with fracture fluids.
The Fracturing Process
The fracturing process entails the pumping of fracture fluids, primarily water with sand proppant and chemical additives, at sufficiently high pressure to overcome the compressive stresses within the shale formation for the duration of the fracturing procedure. Each stage is typically of the order of a few hours. The process increases formation pressure above the critical fracture pressure, creating narrow fractures in the shale formation. The sand proppant is then pumped into these fractures to maintain a permeable pathway for fluid flow after the fracture fluid is withdrawn and the operation is completed.
The fracturing process itself poses minimal risk to the shallow groundwater zones that may exist in the upper portion of the wellbore. As described previously, multiple layers of cement and casing protect the freshwater zones as the fracture fluid is pumped from the surface down into the shale formation. This protection is tested at high pressures before the fracturing fluids are pumped downhole. Once the fractur

ing process is underway, the large vertical separation between the shale sections being fractured and the shallow zones prevents the growth of fractures from the shale formation into shallow groundwater zones. Table 2.4 describes the typical separations in the major shale plays; in all but one case there are several thousand feet of rock — typically sandstones and shales, many of which have very low permeability — separating the fractures shale formation and the groundwater zones. It should be noted here that only shallow zones contain potable water; as depths increase, the salinity of the groundwater increases to the point that it has no practical utility.
A recently published report summarizes the results of a large number of fracturing opera

tions in the Barnett and the Marcellus shales (Fisher, 2010). Figure 2.19 illustrates these results for the Marcellus shale, showing that in all cases the highest growth of the fractures remains separated from the groundwater aquifers by thousands of feet of formation.

Basin Depth to Shale (ft) Depth to Aquifer (ft)
Barnett 6,500–8,500 1,200 Fayetteville 1,000–7,000 500 Marcellus 4,000–8,500 850 Woodford 6,000–11,000 400 Haynesville 10,500–13,500 400 Table 2.4 Separation Distance between Gas Shales and Shallow Freshwater Aquifers in Major PlaysChapter 2: Supply 41 The physical realities of the fracturing process, combined with the lack of reports from the many wells to date of fracture fluid contamina

tion of groundwater, supports the assertion that fracturing itself does not create environmental concerns. However, this simple statement does not address the full range of environmental concerns listed earlier:

1. Leakage of natural gas or drilling fluids into shallow zones: this appears to be the most common cause of reported incidents, and it is generally associated with drilling and setting the surface casing. There are three potential risks during this phase of operation: (1) overweight drilling mud causing some drilling fluid leakage into groundwater zones; (2) unexpected encounters with shallow gas zones with the possibility of gas migration into groundwa

ter zones and (3) poor quality cementing of the surface casing, allowing a potential fluid pathway into the groundwater zones during subsequent operations. The protection of groundwater aquifers is one of the primary objectives of state regulatory programs, and it should be emphasized that good oil field practice, governed by existing regulations, should provide an adequate level of protec

tion from these problems.
Nevertheless, regulations vary by state, as a function of local conditions and historical precedent — best practice involves setting cement all the way to surface, and conduct

ing pressure tests and cement-bond logs to ensure the integrity of the surface casing. A detailed comparison of state-by-state regulation would facilitate the widespread adoption of best practice.

RECOMMENDATION C onduct an inter-state regulatory review and, within constraints of local considerations, adopt best practice for drilling and high-volume hydraulic fracturing. Figure 2.19 Fracture Growth in the Marcellus; Marcellus Shale Mapped Fracture Treatments (TVD)

0

1,000

2,000

3,000

4,000

5,000

6,000

7,000

8,000

9,000Depth (ft)

1 51 101 151 201 251 351 301 F r ac Stages (So r ted on P erf Midpoint) Deepest Aquifier Depth f r ac T OP
perf T OP

P erf Midpoint
perfBTM

f r acBTM

P A OH

WV

Source: Pinnacle Halliburton Service, Kevin Fisher, Data Confirm Safety of Well Fracturing from July 201042 MIT S T UDY ON T HE FU T URE O F N A T URAL GA S 2. On-site surface spills: the drilling and completion process involves the handling of many thousands of barrels of fluids on-site, in particular drilling mud and fracture fluids. Spills can occur as a result of failure of equipment such as pumps and hoses; in addition, there is potential for overflow of tanks and surface pits. Issues will arise if the volume of spilled material is such that local waterways could be con

taminated. These issues are not specifically associated with the fracturing process, and avoiding spills is a normal part of good oil field management practice. The high volumes of fluid associated with shale fracturing may increase spill potential.
Again, state regulations stipulate the requirements for protecting surface waters against leaks and spills, with regulation varying from state to state.

Shale fracture fluid or “slickwater,” is largely composed of water, which generally constitutes over 99% of the liquid com

ponent. As described in Table 2.5, a number of additives are mixed in with the water to increase the effectiveness of the fracturing operation — these additives will vary as a function of the well type and the prefer

ences of the operators. While there has been concern about the transparency of information as regards the make-up of these additives, there has been considerable progress on this issue. Although precise formulations remain proprietary, informa

tion is now becoming available for all the chemical compounds contained within the fluids.
In addition to greater transparency about the compounds, there is also progress towards elimination of the toxic components from the additives.

RECOMMENDATION Require the complete disclosure of all fracture fluid components.

RECOMMENDATION C ontinue e ff orts to eliminate toxic components of fracture fluids.

Purpose Chemical Common Use clean up damage from initial drilling, initiate cracks in rock HCl swimming pool cleaner

gel agents to adjust viscosity guar gum thickener in cosmetics, toothpaste, sauces viscosity breakers ammonium persulfate, potassium, sodium peroxydisulfate bleach agent in detergent and hair cosmetics biocides gluteraldehyde, 2,2-dibromo3- nitrilophopionamide medical disinfectant

surfactant isopropanol glass cleaner, antiperspirant corrosion inhibitor n, n-dimethylformamide pharmaceuticals clay stabilizer potassium chloride low sodium table salt substitute Table 2.5 Typical Fracture Fluid Additives

Source: Kaufman et al. 2008Chapter 2: Supply 43 3. Off-site wastewater disposal — another potential issue is the disposal of waste from fracturing operations, in particular the fracture fluid and formation water that isreturned from the well when it is backflowed upon completion of the fracturing operation, prior to start of production. Typically, less than 100% of the injected fluid will be recovered, and it will generally be mixed with some volume of displaced formation brine. This fluid must be dis

posed of appropriately.
Every year the onshore U.S. industry safely disposes of approximately 18 billion barrels of produced water. By comparison, a high-volume shale fracturing operation may return around 50 thousand barrels of fracture fluid and formation water to the surface. The challenge is that these volumes are concentrated in time and space.
The optimum method for disposal of oil field wastewater is injection into a deep saline aquifer through an EPA regulated Underground Injection Control (UIC) water disposal well. Problems can occasion

ally arise if there are insufficient wastewater disposal wells, as appears to be the case in Pennsylvania. Waste can be disposed of at wastewater treatment plants, but problems can arise if the fluid for disposal is of high salinity or contains other contaminants 19 ; this may cause the effluent from the treatment plant to exceed desired limits. Much effort is now focused on addressing this issue where disposal problems exist. One approach is to recycle the flow-back fluid: using the flow-back fluid from one well as a component in the fracture fluid of the next well. This has the additional advantage of reducing the total amount of water that must be imported to site. In addition, techniques are also being developed to clean up wastewater prior to disposal.

4. Water withdrawal — large quantities of water, typically of the order of 100,000 barrels, are required for high-volume hydraulic fracturing, and this has raised concerns about the impact on local water

resources.
While there may be temporary impacts on local resources, the overall impact is small, as can be seen when the volumes are placed in the context of total water usage. Table 2.6 looks at water usage for shale gas opera

tions as a fraction of total water usage in a number of major shale plays — in all cases shale development water usage represents less than 1% of total water usage in the affected areas.44 MIT S T UDY ON T HE FU T URE O F N A T URAL GA S Indeed, the “water intensity” of shale gas development, at around 1 gallon of water consumed for every MMBtu of energy pro

duced, is low compared to many other energy sources. By way of contrast, several thousand gallons of water per MMBtu of energy pro

duced can be used in the irrigation of corn grown for ethanol.
Nevertheless, careful planning and coordina

tion is necessary to ensure that episodic water withdrawals do not disrupt local supply

sources.

RECOMMENDATION Prepare integrated regional water usage and disposal plans for the major shale areas.

RECOMMENDATION Undertake collaborative R& D to reduce water usage and develop cost-e ff ective water recycling. 5. Road traffic and environmental dis

turbance — oil and gas operations have the potential to be disruptive to local

com munities in the field development phase of well drilling and completion, particularly in those areas not accustomed to routine oil field operations. As indicated in Table 2.7, the large volumes of water involved in fracturing operations can create high volumes of road traffic.
It should be emphasized that the large number of traffic movements shown on this table are really worst-case numbers. In particular, re-use of flowback wastewater can and does significantly reduce the road traffic associated with hauling water, which represents much of the traffic movement. Furthermore, large-scale operators are also using pipelines to transport water to site, further reducing the amount of road traffic very substantially. Play Public Supply Industrial/ Mining Irrigation Livestock Shale Gas Total Water Use (Bbbls/yr)
Barnett TX 82.7% 3.7% 6.3% 2.3% 0.4% 11.1 Fayetteville AR 2.3% 33.3% 62.9% 0.3% 0.1% 31.9 Haynesville LA/TX 45.9% 13.5% 8.5% 4.0% 0.8% 2.1
Marcellus NY/PA/WV 12.0% 71.7% 0.1% <0.1% <0.1% 85.0 Table 2.6 Comparative Water Usage in Major Shale Plays

Source: ALL ConsultingChapter 2: Supply 45 In conclusion, it is clear that oil and gas development is not without risk to the natural environment. State and Federal regulations are designed to mitigate those risks. However, though not the result of risks inherent to the fracturing of shale gas wells, operational errors and poor drilling practice do result in a signifi

cant number of incidents. Implementation of the recommendations described above, together with rigorous enforcement of all applicable regulations, should reduce the number of incidents and ensure that shale development can proceed with minimum impact on the environment.

MET H ANE HY DRATE S 20
Methane hydrates are not considered in the resource estimates and supply curves described above, as they are still at a very early stage in terms of resource definition and understand

ing. Nevertheless, gas hydrates could represent a significant long-term resource option, possi

bly in North America but particularly in some other parts of the world. Methane hydrates are an ice-like form ofmethane and water stable at the pressuretemperature conditions common in the shallow sediments of permafrost areas and continental margins. Globally, the total amount of methane sequestered in these deposits probably exceeds 100,000 Tcf, of which ~99% occurs in ocean sediments. Most of this methane is trapped in highly disseminated and/or low saturation methane hydrates that are unlikely to ever be a commercially viable gas source. An estimated 10,000 Tcf may be technically recoverable from high-saturation gas hydrate deposits (Boswell and Collett, 2010), primarily concentrated in permeable (likely sand-rich) sediments. Activity 1 Rig, 1 Well 2 Rigs, 8 Wells Pad and Road Construction 10 – 45 10 – 45 Drilling Rig 30 60 Drilling Fluid and Materials 25 – 50 200 – 400 Drilling Equipment (casing, drill pipe, etc.) 25 –50 200 – 400 Completion Rig 15 30 Completion Fluid and Materials 10 – 20 80 – 160 Completion Equipment (pipe, wellhead, etc.) 5 10 Fracturing Equipment (pump trucks, tanks, etc.) 150 – 200 300 – 400 Fracture Water 400 – 600 3,200 – 4,800 Fracture Sand 20 – 25 160 – 200 Flowback Water Disposal 200 – 300 1,600 – 2,400 Total 890 – 1,340 5,850 – 8,905 Table 2.7 Truck Journeys for a Typical Shale Well Drilling and Completion

Source: NTC Consulting46 MIT S T UDY ON T HE FU T URE O F N A T URAL GA S To date, there have been few formal quantita

tive assessments of methane sequestered in gas hydrates at regional scales. A recent assessment of in-place resources in northern Gulf of Mexico yielded 6,717 Tcf (median) for sands (Frye, 2008), and other assessments based on similar methodology are expected soon for the U.S. Atlantic Margin and other U.S. margins. The only assessment of technically recoverable methane hydrates ever completed calculated 85.4 Tcf (median) for permafrost-associated gas hydrates on the Alaskan North Slope (Collett et al., 2008). Outside the U.S., the only formal assessment covers ~10% of the area associated with a certain gas hydrates seismic marker in the Nankai Trough and yielded 20 Tcf methane in-place in the high saturation section (Fujii et al., 2008). Figure 2.20 USGS Database of Locations at which Gas Hydrate Has Been Recovered (circles) or Strongly Inferred Based on Drilling-Based Evidence (squares) from Permafrost Areas (black labels) or from Depths Greater than 50 m below the Seafloor (white labels). The color-coding refers to the primary (outer symbol) and, where relevant, the secondary (inner symbol) type of gas hydrate reservoir, using terminology from the gas hydrate resource pyramid (Figure 2.21 in MITEI report). Academic drill sites where deep gas hydrate was recovered but for which reservoir type has not been determined are designated by ODP/DSDP.

Source: Ruppel, C., Collett, T. S., Boswell, R., Lorenson, T., Buczkowski, B., and Waite, W., 2011, A new global gas hydrate drilling map based on reservoir type, Fire in the Ice, DOE-NETL Newsletter, May edition, vol. 11(1), 13–17.Chapter 2: Supply 47 Several research challenges remain before gas hydrate assessments become routine. The greatest need is geophysical methods that can detect gas hydrates and constrain their in situ saturations more reliably than seismic surveys alone and less expensively than direct drilling and borehole logging. Electromagnetic (EM) methods have shown some promise in deep marine settings, but refinements in seismic techniques (e.g., full waveform inversions, seismic attribute analysis) may yet prove even more useful than routinely combining EM and seismic surveys.
Methane hydrates are unlikely to reach com

mercial viability for global markets for at least 15 to 20 years. Through consortia of govern

ment, industry and academic experts, the U.S., Japan, Canada, Korea, India, China and other countries have made significant progress on locating and sampling methane hydrates. No short-term production test has ever been attempted in a marine gas hydrate setting, but several short-term tests (few hours to a fewdays) have been completed in permafrostassociated wells in the U.S. and Canadian Arctic. Before 2015, the first research-scale, long-term (several months or longer) produc

tion tests could be carried out by the U.S. DOE on the Alaskan North Slope and by the Japanese MH21 project for Nankai Trough deepwater gas hydrates. The goals of these tests are to investigate the optimal mix of production techniques to sustain high rates of gas flow over the lifetime of a well and to assess the environmental impact of production of methane from gas hydrates.
Producing gas from methane hydrates requires perturbing the thermodynamic stability conditions to drive dissociation (breakdown) of the deposits into their constituent gas and water. The gas can then be extracted using well-established production methods. Depres

surization of the formation is the preferred technique for driving gas hydrate dissociation Figure 2.21 The Methane Hydrate Resource Pyramid, After Boswell and Collett (2006)

Ma rcellu s Haynesville W ood fo rd

Barnet t Fa y etteville e. g ., 85 Tc f technically reco ve rable on Alask an Nor th Slope (C ollett et al., 2008)

e. g ., 6,717 Tc f in-place Nor thern Gulf of Mexico sand s (F ry e, 2008) Arc tic (permafrost-associated) sand reser v oirs

Marine shale s (low permeability) Massiv e sea ! oor/shallo w hy drates at seeps Non-sand marine reser v oirs (including frac ture ! lling ) Marine sand r eser v oirs

0 Increasing in-place resource s

0 Decreasing reser v oir qualit y

0 Decreasing resource estimate accurac y

0 Increasing produc tion challenges

0 Likely decreasing reco ve ry fac to r

Source: After Boswell and Collett (2006)



## Methane hydrates are unlikely to reach commercial viability for global markets for at least 15 to 20 years.48 MIT S T UDY ON T HE FU T URE O F N A T URAL GA S since it yields a relatively sustainable and well-controlled flow of gas. Thermal stimula

tion through direct heating or injection of heated fluids can be used to drive episodic dissociation during longer-term depressuriza

tion, but requires significant energy expendi

ture. Injection of inhibitors (e.g., seawater or some chemicals) can also dissociate gas hydrates in the formation, although this technique has numerous disadvantages and is unlikely to be practical at large scales. A final production method will be tested on the Alaskan North Slope in 2012 by ConocoPhillips and could in theory produce methane as well as sequester CO 2 : CO 2 injected into methane hydrate deposits should liberate methane while simultaneously trapping the CO 2 within stable gas hydrates (Yezdimer et al., 2002; Farrell et al., 2010).
At present, most conventional oil and gas producers avoid intersecting gas hydrate deposits to prevent long-term damage to the borehole due to unintended dissociation. Producing gas from methane hydrates willinstead require targeted drilling into highsaturation deposits and careful management of potentially large amounts of co-produced water. The depths at which gas hydrate occurs are shallower than those associated with (deepwater) conventional gas, rendering gas hydrate well control less of a challenge. Gas hydrate dissociation is also a self-regulating process in most cases, so there is little danger of runaway dissociation. Changes in bulk sediment volume and sediment strength are expected if high-saturation gas hydrates are dissociated, but the impact of these changes will depend on many factors, including the geologic setting, the depth of the deposits and the fate of produced water. In short, the risks associated with gas production from methane hydrates located beneath permafrost or deep within marine sediments are either largely known from existing gas operations or consid

ered manageable.

RECOMMENDATION C ontinue methane hydrates research program to develop methods for remote detection of highly concentrated deposits; conduct formal resource assessments; and prove the resource potential through long-term production testing.Chapter 2: Supply 49 APP ENDICE S

2A: Additional resource data tables and maps 2B: Methodology for creating resource ranges 2C: Additional supply curves and background information 2D: Shale gas economics 2E: Analysis of reported gas drilling incidents SU PPL EMENTAR Y PA P ER S ON MITEI W E BS ITE :

SP 2.1 Natural Gas Resource Assessment Methodologies – Dr. Qudsia Ejaz SP 2.2 Background Material on Natural Gas Resource Assessments with Major Resource Country Reviews – Dr. Qudsia Ejaz SP 2.3 Role of Technology in Unconventional Gas Resources – Dr. Carolyn Seto SP 2.4 Methane Hydrates – Dr. Carolyn Ruppel50 MIT S T UDY ON T HE FU T URE O F N A T URAL GA S R E F ERENCE S
Ahlbrandt, Thomas S., Ronald R. Charpentier, T. R. Klett, James W. Schmoker, Christopher J. Schenk and Gregory F. Ulmishek. Global Resource Estimates from Total Petroleum Systems . AAPG, 2005. ALL Consulting: Water and Shale Gas Develop

ment; Presentation to National Association of Royalty Owners Annual Conference; October 2010. Attanasi, E. D., and T. C. Coburn. “A bootstrap approach to computing uncertainty in inferred oil and gas reserve estimates.” Natural Resources Research 13, no. 1 (2004): p. 45–52. Boswell, R., and T. Collett, 2006. The gas hydrates resource pyramid: Fire in the Ice, Methane Hydrate Newsletter, U.S. Department of Energy, Office of Fossil Energy, National Energy Technology Laboratory, Fall Issue, p. 5–7. http://www.netl.doe.gov/technologies/ oil-gas/publications/Hydrates/Newsletter/ HMNewsFall06.pdf#page=5 Boswell, R., and T. Collett. “Current Perspectives on Gas Hydrate “Resources”. Energy Environ. Sci., 2011. doi: 10.1039/C0EE00203H. Cadmus Group; Preliminary Analysis of Recently Reported Contamination; Prepared for: Drinking Water Protection Division (DWPD) Office of Ground Water and Drinking Water (OGWDW) U.S. Environmental Protec

tion Agency (EPA) Hydraulic Fracturing; September 2009. Collett, T., W. Agena, M. Lee, M. Zyrianova, T. Charpentier, D. Houseknecht, T. Klett, R. Pollastro and C. Schenk. Assessment of Gas Hydrate Resources on the North Slope . U.S. Geological Survey Factsheet. United States Geological Survey, 2008. Energy Information Administration. U.S. Crude Oil, Natural Gas and Natural Gas Liquids Reserves Report . Energy Information Adminis

tration, February 2009. http://www.eia.doe.gov/ oil_gas/natural_gas/data_publications/crude_ oil_natural_gas_reserves/cr.html. Farrell, H., Boswell, R., Howard, J., and Baker, R., 2010, CO 2 -CH 4 exchange in natural gas hydrate reservoirs: potential and challenges, in DOE-NETL Fire in the Ice, Methane Hydrate Newsletter, March 2010, p. 19–21. http://www. netl.doe.gov/technologies/oil-gas/publications/ Hydrates/Newsletter/MHNews_2010_03. pdf#page=19 Fisher, Kevin; Data Confirm Safety of Well Fracturing; The American Oil and Gas Reporter; July 2010. Frye, M. Preliminary evaluation of in-place Gas Hydrate Resources: Gulf of Mexico Outer Continental Shelf. Minerals and Management Services, 2008. Fujii, T., T. Saeiki, T. Kobayashi, T. Inamori, M. Hayashi, O. Takano, T. Takayama, T. Kawasaki, S. Nagakubo, M. Nakamizu and K. Yokoi, 2008. Resource assessment of methane hydrate in the Nankai Trough, Japan, Offshore Technology Conference, Houston, TX, Paper 19310. Ground Water Protection Council; ALL Consulting; Modern Shale Gas Development in the United States: A Primer; U.S. Depart

ment of Energy; National Energy Technology Laboratory. Kaufman, P., Penny, G. S., Paktinat, J.: Critical evaluations of additives used in shale slickwater fracs. Paper SPE 119900 presented at the 2008 SPE Shale Gas Production Conference, Ft. Worth TX, 16–18 November 2008. Minerals Management Service. Assessment of Undiscovered Technically Recoverable Oil and Gas Resources of the Nation’s Outer Continental Shelf, 2006 (Summary Brochure). Minerals Management Service, February 2006. National Petroleum Council. Balancing Natural Gas Policy – Fueling the Demands of a Growing Economy . National Petroleum Council, September 2003.Chapter 2: Supply 51 NTC Consultants: Impact on Community Character of Horizontal Drilling and High Volume Hydraulic Fracturing in Marcellus Shale and Other Low-Permeability Gas Reservoirs; September 2009. New York State Department of Environmental Conservation Division of Mineral Resources; Supplemental Generic Environmental Impact Statement on the Oil, Gas and Solution Mining Regulatory Program; Well Permit Issuance for Horizontal Drilling and High-Volume Hydraulic Fracturing to Develop the Marcellus Shale and Other Low-Permeability Gas Reser

voirs; September 2009. Potential Gas Committee. Potential Supply of Natural Gas in the United States – Report of the Potential Gas Committee (December 31, 2006)

. Potential Supply of Natural Gas in the United States. Potential Gas Agency, Colorado School of Mines; November 2007.

———. Potential Supply of Natural Gas in the United States – Report of the Potential Gas Committee (December 31, 2008) . Potential Supply of Natural Gas in the United States. Potential Gas Agency, Colorado School of Mines; December 2009.

———. Potential Supply of Natural Gas in the United States – Report of the Potential Gas Committee (December 31, 2008) – Advance Summary . Potential Supply of Natural Gas in the United States. Potential Gas Agency, Colorado School of Mines; June 2009. Reservoir Research Partners and Tudor Pickering & Holt; Frac Attack: Risk, Hype and Financial Reality of Hydraulic Fracturing in the Shale Plays; July 2010. Rogner, H. H. “An Assessment of World Hydrocarbon Resources.” Annual Review of Energy and the Environment, 22, no. 1 (1997): p. 217–262. United States Geological Survey. “National Oil and Gas Assessment, USGS-ERP,” 2010. http:// energy.cr.usgs.gov/oilgas/noga/index.html.———. “World Petroleum AssessmentInformation, Data and Products, USGS-ERP,” n.d. http://certmapper.cr.usgs.gov/rooms/ we/index.jsp. Vidas, E.H., Hugman, R.H. & Haverkamp, D.S., 1993. Guide to the Hydrocarbon Supply Model: 1993 Update. Gas Research Institute, Report GRI-93/0454

. Watershed; Craig Michaels, Program Director; James L. Simpson, Senior Attorney; William Wegner, Staff Scientist; Fractured Communities – Case Studies of the Environmental Impacts of Industrial Gas Drilling; September 2010. Yezdimer, E., Cummings, P., Chalvo, A., 2002. “Extraction of methane from its gas clathrate by carbon dioxide sequestration – determination of the Gibbs Free Energy of gas replacement and molecular simulation.” J. Phys. Chem A., 106 p. 7982–7987.52 MIT S T UDY ON T HE FU T URE O F N A T URAL GA S N OTE S

1 Thermogenic gas is formed by the application of heat and pressure on organic matter; natural gas can also be formed through a biogenic process, in which microbial action in an anaerobic (oxygen free) environment creates methane from organic matter — for example, in swamps, land-fills and shallow formations. This chapter of the report is focused on thermogenic gas.

2 Permeability is a measure of the ability of a porous medium, such as that found in a hydrocarbon reservoir, to transmit fluids, such as gas, oil or water, in response to a pressure differential across the medium. In petroleum engineering, permeability is usually measured in units of millidarcies (mD). Unconventional formations, by definition, have permeability less than 0.1mD.

3 ICF International is a consulting firm whose services were used in preparation of supply curves for this study.

4 In the US, natural gas volumes are typically measured in Standard Cubic Feet (Scf), where the volume is measured at a temperature of 60°F and a pressure of one atmosphere (14.7 pounds per square inch). 1 trillion cubic feet (Tcf) = 1,000,000,000,000 (or 10 12 ) Scf. Outside North America, natural gas volumes are typically measured in cubic meters. 1 cubic meter 5 35.3 cubic feet.

5 Appendix 2A provides additional maps and detailed data tables concerning gas resource estimates. Supplementary Paper SP 2.2 “Background Material on Natural Gas Resource Assessments with Major Resource Country Reviews,” by Dr. Qudsia Ejaz, published on the MITEI website, provides additional material.

6 Appendix 2B provides details on the methodology used to create the uncertainty estimates shown in this chapter.

7 Appendix 2C provides further details of cost curves prepared for this study.

8 Supply curves shown here are based on oil field costs in 2007. There has been considerable oil field cost inflation, and some recent deflation, in the last 10 years. We have estimated cost curves on a 2004 base (the end of a long period of stable costs) and a 2007 base (reasonably comparable to today’s costs, 70% higher than the 2004 level, and continuing to decline).

9 Appendix 2A contains further details on global unconventional resources.

10 Rogner, “An Assessment of World Hydrocarbon

Resources”, 1997. 11 At the time of writing, new more detailed estimates of global unconventional resources are starting to be published. See, for example, World Shale Gas Resources: An Initial Assessment of 14 Regions Outside the United States . Produced by Advanced Resources International (ARI) for the U.S. EIA April 2011.

12 Appendix 2A provides additional maps and

detailed data tables concerning gas resource estimates.

13 Appendix 2D contains a detailed discussion of the

economic performance of the major U.S. shale plays.

14 These are illustrative calculations only, not based

on actual “wet” well performance. The calculations assume that well performance, costs, etc., are unchanged by increasing levels of liquids pro duc

tion. In practice, gas production may be affected by liquid co-production.

15 This is not a forecast of production — but rather

an illustration of the production potential at an assumed drilling rate and assuming a median estimate of resources.

16 A detailed discussion of the science and technology

of unconventional gas resources can be found in the Supplementary Paper SP 2.3 “Role of Technology in Unconven tional Gas Resources,” by Dr. Carolyn Seto, published on the MITEI website.

17 Kerogen and bitumen are comprised of organic

matter that occurs in hydrocarbon source rocks, formed from the application of heat and pressure to buried organic material over geological time. Kerogen is insoluble in normal organic solvents, while bitumen is soluble.

18 The Fracture Responsibility and Awareness of

Chemicals (FRAC) Act of 2009 proposed to regulate fracturing under the Underground Injection Control provisions of the Safe Water Drinking Act, and to mandate full disclosure of the chemical constituents of all fracture fluid additives. The Bill did not make it out of Committee during the 2009–2010 session of Congress.

19 Flowback fluid can contain: dissolved solids

(chlorides, sulfates, and calcium); metals (calcium, magnesium, barium, strontium) suspended solids; mineral scales (calcium carbonate and barium sulfate); acid producing bacteria and sulfate reducing bacteria; friction reducers; iron solids (iron oxide and iron sulfide); dispersed clay fines, colloids and silts; acid gases (carbon dioxide, hydrogen sulfide); radionuclides (New York Generic Environmental Impact Statement).

20 A detailed discussion of methane hydrates can be

found in the Supplementary Paper SP 2.4 “Methane Hydrates,” by Dr. Carolyn Ruppel, published on the MITEI website.Chapter 3: System Studies 53 

# Chapter 3: U.S. Gas Production, Use and Trade: Potential Futures

INTRODUCT I ON
As discussed in other sections of this report, many factors will influence the future role of natural gas in the U.S. energy system. Here we consider the most important of these: Greenhouse Gas (GHG) mitigation policy; technology development; size of gas resources; and global market developments. And we examine how they will interact to shape future U.S. gas use, production and trade over the next few decades.
We investigate the importance of these factors and their uncertainties by applying established models of the U.S. and global economy (see Box 3.1). Alternative assumptions about the future allow us to create a set of scenarios that provides bounds on the future prospects for gas and illustrate the relative importance of different factors in driving the results.
The conditions explored include the High, Mean and Low ranges of gas resource estimates described in Chapter 2. We show the impacts of various policy alternatives, including: no new climate policy; a GHG emission reduction target of 50% by 2050, using a price-based policy (such as a cap-and-trade system or emissions tax) and an emissions policy that uses a set of non-price regulatory measures.
Several assumptions have a particularly impor

tant effect on the analysis. Long-term natural gas supply curves, distinguishing the four gas types for the U.S. and Canada, are drawn from Chapter 2. U.S. economic growth is assumed to be 0.9% per year in 2005 to 2010, 3.1% in 2010 to 2020 (to account for recovery) and 2.4% for 2020 to 2050. BOX 3.1 GLO B AL AND U.S. ECONOMIC M OD E L S Projections in this section were made using the MIT Emissions Prediction and Policy Analysis (EPPA) model and the U.S. Regional Energy Policy (USREP) model. 1 Both are multi-region, multi-sector representations of the economy that solve for the prices and quantities of energy and non-energy goods and project trade among regions. The core results for this study are simulated using the EPPA model — a global model with the U.S. as one of its regions. The USREP model is nearly identical in structure to EPPA, but represents the U.S. only — segmenting it into 12 single and multi-state regions. In the USREP model, foreign trade is represented through import supply and export demand functions, broadly benchmarked to the trade response in the EPPA model. Both models account for all Kyoto gases. The advantage of models of this type is their ability to explore the interaction of those factors underlying energy supply and demand that influence markets. The models can illustrate the directions and relative magni

tudes of influences on the role of gas, provid

ing a basis for judgments about likely future developments and the e ff ects of government policy. However, results should be viewed in light of model limitations. Projections, espe

cially over the longer term, are naturally subject to uncertainty. Also, the cost of technology alternatives, details of market organization and the behavior of individual industries (e.g., various forms of gas contracts, political constraints on trade and technology choice) are beneath the level of model aggre

gation. The five-year time step of the models means that the e ff ects of short-term price volatility are not represented.54 MIT S TU DY ON T HE F UTU RE O F N A TU RAL GA S Influential cost assumptions are shown in Table 3.1. The first column contains technology costs imposed in the main body of the analysis,as documented in Appendix 3A. The rightmost column shows values to be employed in sensitivity tests to be explored later, where we vary the costs of competing generation tech

nologies (nuclear, coal and gas with carbon capture and storage and renewables). The intermittent renewables (wind and solar) are distinguished by scale. At low penetration levels, they enter as imperfect substitutes for conventional electricity generation, and the estimates of the levelized cost of electricity (LCOE 4 ) apply to early installations when renewables are at sites with access to the best quality resources and to the grid, and storage or backup is not required. Through the elasticity of substitution, the model imposes a gradually increasing cost of production as their share increases, to be limited by the cost with backup. These energy sector technologies, like others in the model, are subject to cost reductions over time through improvements in labor, energy and (where applicable) land productivity.
The potential role of compressed natural gas in vehicles is considered separately, drawing on estimates of the cost of these vehicles from Chapter 5 of this report.
We also consider two possible futures for international gas markets: one where they continue in their current pattern of regional trading blocs and an alternative where there develops a tightly integrated global gas market similar to that which now exists for crude oil. Reference Sensitivity Coal 5.4 Advanced Natural Gas (NGCC) 5.6 Advanced Nuclear 2 8.8 7.3 Coal/Gas with CCS 3 9.2/8.5 6.9/6.6 Renewables

Wind 6.0 Biomass 8.5 Solar 19.3 Substitution elasticity (Wind, Biomass, Solar) 1.0 3.0

Wind+Gas Backup 10.0 Table 3.1 Levelized Cost of Electricity (2005 cents/kWh)

Source: EPPA, MITChapter 3: System Studies 55 To explore the future of U.S. gas use in a carbon-constrained world, we analyze three scenarios of greenhouse control, with very different implications for the energy sector as a whole. Scenario 1 establishes a baseline, with no GHG policy measures beyond those in place today. Emissions grow by some 50% over the period, as shown in Figure 3.1. Scenarios 2 and 3 are constructed to span a wide range of possible approaches to climate policy, and potential effects on gas use. Scenario 2 assumes that a price-based policy is imposed on all U.S. GHG emissions with a target of a 50% reduc

tion by 2050, as can be seen in Figure 3.1. Scenario 3 imposes no economy-wide target, but considers two measures proposed for the electric power sector: a renewable energy standard and measures to force retirement of coal-fired power plants. As seen in Figure 3.1, this scenario of a regulatory approach essen

tially stabilizes U.S. GHG emissions, yielding only about 10% increase by 2050.

Figure 3.1 U.S. Greenhouse Gas Emissions under Alternative Scenarios

10,000

8,000

6,000

4,000

2,000

0MtCO2e

Y ear 2010 2020 2030 2040 2050

0 2000 4000 6000 8000 10000 0.0 0.2 0.4 0.6 0.8 1.0 Haynesville W ood fo rd Barnett Fa y etteville

P olic y (net of carbon)

P olic y (incl. carbon) No P olic y Pr ic e- Based Regulato ry0.00.20.40.60.81.0

Source: EPPA, MIT T HE RO LE O F U .S. C LIMA T E P O LI C Y — T H R EE AL T E RN A T IVE S C E N A R I O S56 MIT S TU DY ON T HE F UTU RE O F N A TU RAL GA S Scenario 1 — No Additional GHG Mitigation Policy
Unless gas resources are at the Low end of the resource estimates in Chapter 2, domestic gas use and production are projected to grow substantially between now and 2050. This result is shown in Figure 3.2, from EPPA model simulations, on the assumption that global gas markets remain fragmented in regional trading blocs. Under the Mean resource estimate, U.S. gas production rises by around 40% between 2005 and 2050, and by a slightly higher 45% under the High estimate. It is only under the Low resource outcome that resource availability substantially limits growth in domestic produc

tion and use. In that case, gas production and use plateau around 2030 and are in decline by 2050. The availability of shale gas resources has a substantial effect on these results. If the Mean estimate for other gas resources is assumed, and this same projection is made omitting the shale gas component of supply, U.S. production peaks around 2030 and declines to its 2005 level by 2050.
Given the continued existence of regional trading blocs for gas, there is little change in the role played by imports and exports of gas. Imports (mainly from Canada) are roughly constant over time, though they increase when U.S. resources are Low. Exports (principally to Mexico) are also maintained over the period and grow somewhat if U.S. gas resources are at the High estimate.

Impor ts Pr oduc tion–Expor ts Expor ts 45

40

35

30

25

20

15

10

5

0Tcf

Barnett 2020 2030 2040 2050 L M H L M H L M H L M H

Ma rcellu s 

### Y

ear

0.0 0.2 0.4 0.6 0.8 1.0 7.0 6.9 6.8 8.6 8.0 7.9 10.9 9.2 8.7

15.5 10.4 9.5 Figure 3.2 U.S. Gas Use, Production and Imports & Exports (Tcf), and U.S. Gas Prices above Bars ($/1000 cf) for Low (L), Mean (M) and High (H) U.S. Resources. No Climate Policy and Regional International Gas Markets

Source: EPPA, MITChapter 3: System Studies 57 Gas prices (2005 U.S. dollars), shown at the top of the bars in Figure 3.2, rise gradually over time as the lower-cost resources are depleted; the lower the resource estimate, the higher the prices. The difference in prices across the range of resource scenarios is not great for most periods. In 2030, for example, the High resource estimate yields a price 2% below that for the Mean estimate, while the Low resource condition increased the price by 7%. The difference increases somewhat over time, especially for the Low resource case. By 2050, for example, the price is 8% lower if the High resource conditions hold, but 50% higher if domestic resources are at the Low estimate.
Underlying these estimates are developments on the demand side. Under Mean resources, electricity generation from natural gas would rise by about 70% over the period 2010 to 2050 though coal would continue to dominate, with only a slightly growing contribution projected from nuclear power and renewable sources (wind and solar). National GHG emissions rise by about 40% from 2005 to 2050. More detailed results for the scenarios with Mean resources are provided in Appendix 3B.
Scenario 2 — Price-Based Climate Policy
An incentive (or price) based GHG emissions policy that establishes a national price on GHG emissions serves to level the emissions reduc

tion playing field by applying the same penalty to emissions from all sources and all uses.
The policy explored here gradually reduces total U.S. GHG emissions, measured in CO 2 equivalents (CO 2 -e) 5 , to 50% below the 2005 level by 2050. The scenario is not designed to represent a particular policy proposal and no provision is included for offsets. While measures taken abroad are not of direct interest for this study, such policies or the lack of them will affect the U.S. energy system through international trade. If the U.S. were to pursue this aggressive GHG mitigation policy, we assume that it would need to see similar measures being taken abroad. Thus, a similar pattern of reductions is assumed for other developed countries, with lagged reductions in China, India, Russia, Mexico and Brazil that start in 2020 on a linear path to 50% below their 2020 levels by 2070. The rest of the developing countries are assumed to delay action to beyond 2050. We assume no emis

sions trading among countries.

The broad features of U.S. gas markets under the assumed emissions restriction are not substantially different from the no-policy scenario, at least through 2040 (Figure 3.3). Gas production and use grows somewhat more slowly, reducing use and production by a few Trillion cubic feet (Tcf) in 2040 compared with the case without climate policy. After 2040, however, domestic production and use begin to fall. This decline is driven by higher gas prices, Carbon Dioxide (CO 2 ) charge inclusive, that gas users would see. The price reaches about $22 per thousand cubic feet (cf) with well over half of that price reflecting the CO 2 charge. While gas is less CO 2 intensive than coal or oil, at the reduction level required by 2050, its CO 2 emissions are beginning to represent an emissions problem.
However, even under the pressure of the assumed emissions policy, total gas use is projected to increase from 2005 to 2050 even for the Low estimate of domestic gas resources. 

## Even under the pressure of an assumed CO 2 

## emissions policy, total U.S. gas use is projected to increase up to 2050.58 MIT S TU DY ON T HE F UTU RE O F N A TU RAL GA SA major effect of the economy-wide, pricebased GHG policy is to reduce energy use (Figure 3.4). The effect in the electric sector is to effectively flatten demand, holding it near its current 4 Trillion killowatt hour (TkWh) level (Figure 3.4a). Based on the cost assumptions underlying the simulation (see Appendix 3A) nuclear, Carbon Capture and Storage (CCS) and renewables are relatively expensive compared with generation from gas. Conventional coal is driven from the generation mix by the CO 2 prices needed to meet the economy-wide emissions reduction targets. Natural gas is the substantial winner in the electric sector: the substitution effect, mainly gas generation for coal generation, outweighs the demand reduc

tion effect. For total energy (Figure 3.4b) the demand reduction effect is even stronger, leading to a decline in U.S. energy use of nearly 20 quadrillion (10 15 ) British thermal units (Btu). The reduction in coal use is evident, and oil and current-generation biofuels (included in oil) begin to be replaced by advanced biofuels. Because national energy use is substantially reduced, the share represented by gas is pro

jected to rise from about 20% of the current national total to around 40% in 2040. Figure 3.3 U.S. Gas Use, Production and Imports & Exports (Tcf), and U.S. Gas Prices ($/1000 cf) for Low (L), Mean (M) and High (H) U.S. Resources, Price-Based Climate Policy and Regional International Gas Markets. Prices are shown without (top) and with (bottom) the emissions charge.

Impor ts Pr oduc tion–Expor ts Expor ts 45

40

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0Tcf

2020 2030 2040 2050 L M H L M H L M H L M H


### Y

ear 6.6 9.6 6.5 9.5 6.4 9.4 7.9 13.7 7.5 13.3 7.4 13.2 10.0 18.5 8.6 17.3 8.2 16.9

11.6 23.6 8.8 21.9 8.3 21.8

Source: EPPA, MITChapter 3: System Studies 59 Under this policy scenario, the U.S. emissions price is projected to rise to $106 per ton CO 2 -e in 2030 and to $240 by 2050. The macroeco

nomic effect is to lower U.S. Gross Domestic Product (GDP) by 1.7% in 2030 and 3.5% in 2050. (Other measures of cost are provided in Appendix 3A.) A selection of resulting U.S. domestic prices is shown in Figure 3.5. Natural gas prices, exclusive of the CO 2 price, are reduced slightly by the mitigation policy, but the price inclusive of the CO 2 charge is greatly increased (Figure 3.5a). The CO 2 charge is nearly half of the user price of gas. 6
Even in the No-Policy case, electricity prices are projected to rise by 30% in 2030 and about 45% over the period to 2050 (Figure 3.5b). The assumed emissions mitigation policy is projected to cause electricity prices to rise by almost 100% in 2030 and by two and one-half times by 2050 compared with current prices. Redu ced Us e
Gas CC S
C oal CC S
Rene w Hy dr o Nuclear
Ga s Oi l
C oalTkWh



### Y ear 2010 2015 2020 2025 2030 2035 2040 2045 2050 7

6

5

4

3

2

1

0 

### 3.4a Elec tric Se ct or (T kWh) Figure 3.4 Energy Mix under a Price-Based Climate Policy, Mean Natural Gas Resources

Redu ced Us e
Rene w Hy dr o Nuclear
Ga s Biofuel
Oi l
C oalqBtu



### Y ear 2010 2015 2020 2025 2030 2035 2040 2045 2050 140

120

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### 3.4b T otal Energy Use (qBtu)

Source: EPPA, MIT60 MIT S TU DY ON T HE F UTU RE O F N A TU RAL GA S As noted earlier, a set of alternative cost assumptions was explored for low-carbon technologies in the electricity sector, including less costly CCS, nuclear and renewables (Table 3.1).
Of these, the biggest impact on gas use in electricity results from low-cost nuclear generation. Focusing on 2050, when the effects of alternative assump

tions are the largest, a low-cost nuclear assumption reduces annual gas use in the electric sector by nearly 7 Tcf. Economy-wide gas use falls by only about 5 Tcf, however, because the resulting lower demand for gas in electricity leads to a lower price and more use in other sectors of the economy.
Lower-cost renewables yield a reduction in gas use in the electric sector by 1.8 Tcf in 2030, but total gas use falls by only 1.2 Tcf. In 2050, a difference in gas use is smaller, 0.5 Tcf and 0.1 Tcf respectively, as availability of cheaper renew

ables displaces nuclear power which by that time starts to replace gas in the electric sector. With less-costly CCS, gas use increases in the electric sector by nearly 3 Tcf. This is because both gas generation with CCS and coal generationwith CCS become economic and share the lowcarbon generation market (with about 25% of electricity produced by gas with CCS by 2050 and another 25% by coal with CCS). Gas use in the economy as a whole increases even more, by 4.2 Tcf. 7
Many other combinations of technological uncertainties could be explored. For example, a breakthrough in large-scale electric storage would improve the competitiveness of inter

mittent sources. A major insight to be drawn from these few model experiments, however, is that, under a policy based on emissions pricing to mitigate greenhouse gas emissions, natural gas is in a strong competitive position unless competing technologies are much less expen

sive than we now anticipate. 

## The biggest projected impact on gas use in electricity results from an assumption of low-cost nuclear generation. Figure 3.5 U.S. Natural Gas and Electricity Prices under Alternative Policy Scenarios, Mean Gas Resources

0.30

0.25

0.20

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0.00 3.5b Elec tricity P rices ($/kWh) $/kW h

Y ear 2000 2010 2020 2030 2040 2050 2060

0.00 0.05 0.10 0.15 0.20 0.25 0.30 0. 0 0. 2 0. 4 0. 6 0. 8 1. 0 Haynesville W ood fo rd Barnett Fa y etteville

Po li cy (net of carbon ) Po li cy (incl. carbon ) No P olic y P riced-Based P olic y

Regulato ry P olic y 25

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0 3.5a Natural Gas P rices ($/1000 cf ) $/1000 cf

Y ear 2000 2010 2020 2030 2040 2050 2060

0 5 10 15 20 25 0.0 0.2 0.4 0.6 0.8 1.0 Haynesville W ood fo rd Barnett Fa y etteville

P olic y (net of carbon) P olic y (incl. carbon) No P olic y Pr ic e- Based P olic y (net of carbon )
Pr ic e- Based P olic y (incl. carbon ) Source: EPPA, MITChapter 3: System Studies 61 The simulations shown in Figures 3.3–3.5 do not include the Compressed Natural Gas (CNG) vehicle. When this policy case is repeated with this technology included, applying optimistic cost estimates drawn from Chapter 4 of this report, the result depends on the assumption about the way competing biofuels, and their potential indirect land-use effects, are accounted. Even with advanced biofuels credited as a zero-emissions option, however, CNG vehicles rise to about 15% of the private vehicle fleet by 2040 to 2050. They consume about 1.5 Tcf of gas at that time which, because of the effect of the resulting price increase on other sectors, adds approximately 1.0 Tcf to total national use. 8
Some U.S. regions that have not traditionally been gas producers have significant shale gas resources, and the extent to which these resources are developed is material to the patterns of production and distribution of gas in the U.S. To identify regional patterns of production and use within the U.S., we apply the USREP model and report results for seven regions of the country for 2006 and 2030 under the 50% climate policy target and the Mean gas resources (Figure 3.6). Gas production increases most in those regions with the new shale resources — by more than 78% in the Northeast region (New England through the Great Lakes States) and by about 50% in the South Central area that includes Texas. In regions without new shale resources, 

## Some U.S. regions that have not traditionally been gas producers do have significant shale gas resources, and the extent to which these resources are developed is material to the patterns of production and distribution of gas in the U.S.

Figure 3.6 Natural Gas Production and Consumption by Region in the U.S., 2006 and 2030, Price-Based Policy Scenario, Mean Gas Resources

MOUNTAIN NORTH CENTRAL

SOUTH CENTRAL NORTH EAST

SOUTH EAST WEST

ALASKA 0.3 – 2.7 = -2.4

0.3 – 2.9 = -2.6

5.1 – 2.0 = 3.1

4.3 – 1.8 = 2.5

0.5 – 0.4 = 0.1

0.3 – 0.2 = 0.1 11.6 – 6.6 = 5.0

12.2 – 4.5 = 7.7 0.4 – 1.2 = -0.8

0.2 – 2.1 = -1.9 0.9 – 6.2 = -5.3

1.6 – 7.2 = -5.6

0.7 – 2.5 = -1.8

0.9 – 4.2 = -3.3

FLORIDA GEORGIA SOUTH CAROLINA NORTH CAROLINA

VIRGINIA WISCONSIN

OHIO PENNSYLVANIA MAINE

VERMONT

INDIANA

ILLINOIS WEST VIRGINIA

KENTUCKY

TENNESSEE

ALABAMA MISSISSIPPI MICHIGAN MICHIGAN

NEW HAMPSHIRE

NEW YORK MASSACHUSETTS

RHODE ISLAND
CONNECTICUT

NEW JERSEY

DELAWARE

MARYLAND KANSAS NEBRASKA

MISSOURI MINNESOTA

OKLAHOMA NEW MEXICO COLORADO MONTANA

NEVADA WYOMING IDAHO

UTAH

ARIZONA CALIFORNIA WASHINGTON HAWAII

OREGON

ALASKA TEXAS ARKANSAS

LOUISIANA NORTH DAKOTA

SOUTH DAKOTA

IOWA

Production – Consumption < 0 (Net Imports) Year 2006

Year 2030 Production – Consumption > 0 (Net Imports) Figures refer to annual production and consumption in Tcf. Source: USREP, MIT62 MIT S TU DY ON T HE F UTU RE O F N A TU RAL GA S production changes little, showing slight increases or decreases. In the Northeast, the production increase comes close to matching the projected growth in gas use.
The most substantial potential need for addi

tional interregional gas flows, on the regional definition of Figure 3.6, is from the Texas/South Central region which increases net exports by a combined 2.7 Tcf, with shipment to other regions except the Northeast. 9 Compared to the 2030 interregional flows absent climate policy, the assumed emissions target lowers the need for new capacity largely because of the expan

sion of supply in the Northeast.

Scenario 3 — Regulatory Emissions Reductions
If emissions reductions are sought by regula

tory and/or subsidy measures, with no price on emissions, many alternatives are available. Among the most obvious measures that could have a direct impact on CO 2 emissions would be those requiring renewable energy and one encouraging a phase-out of existing coal-fired power plants. To explore this prospect, we formulate a scenario with a renewable energy standard (RES) mandating a 25% share of electric generation by 2030, and holding at that level through 2050, and measures to force retirement of coal-fired power plants starting in 2020, so that coal plants accounting for 55% of current production are retired by 2050. Mean gas resources are assumed, as are the reference levels of all technology costs. This case results in approximately a 50% reduction in carbon emissions in the electricity sector by 2050, but it does not provide incentives to reduction in non-electric sectors so these measures only hold total national GHG emissions to near the 2005 level, as shown in Figure 3.1.
One evident result of these mitigation measures is that the reduction in energy demand is less than under the assumed price-based policy, either in the electric sector (Figure 3.7a) or in total energy (Figure 3.7b). Also, the measures represented here achieve less emissions reduc

tion in the electricity sector than does the price-based policy. In the price-based policy, reductions in the electricity sector are about 70% by 2050, even though the national target is only a 50% reduction, because it is less costly to abate there than in the rest of the economy. The difference in total national energy use is more dramatic (Figure 3.7b compared with Figure 3.4b) because the all-sector effect of the universal GHG price is missing. 

## Among the most obvious measures that could have a direct impact on CO 2 

## emissions would be those requiring renewable energy and one encouraging a phase-out of existing coal-fired power plants.Chapter 3: System Studies 63 These regulatory measures yield a projection of total U.S. gas use very similar to that under a no-policy assumption, shown in Figure 3.2. Under the Mean resource estimate the 2050 level is almost identical between the two scenarios (see Appendix 3B), and the figure would look essentially the same for the High and Low cases as well. Also, U.S. natural gas prices are essentially the same with these regulatory measures as in the case without additional GHG-policy shown in Figure 3.5a (again see Appendix 3B for a comparison). Electricity prices do differ from the no-policy scenario, however, as higher generation costs are passed along to consumers. The result is presented in Figure 3.8, where by 2050 the coal and renewable regulations raise the electricity price by 50% over its level without GHG policy. Figure 3.7 Energy Mix under a Regulatory Policy, Mean Gas Resources

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Source: EPPA, MIT64 MIT S TU DY ON T HE F UTU RE O F N A TU RAL GA S In this case, the effects on natural gas, compared to a no-policy assumption, are concentrated in the electric sector as the non-electric sectors face roughly the same gas price in both cases.

In the electric sector, the forced expansion of renewables tends to squeeze out gas-based electric generation, particularly in the early decades of the period, while the reduction in coal use opens up opportunities for gas. The net result is a pattern of gas use over time not different from the no-policy case, as noted earlier. Naturally, the net impact on gas use in the electric sector depends on the stringency of the two regulatory measures and their relative pace of implementation, and compared to the assumed price-based approach, they have the potential to reduce the use of gas in the sector. Nonetheless, for this regulatory scenario, like the more ambitious policy-based case, U.S. natural gas demand remains resilient, continu

ing to make a major contribution to national energy use. 

## Natural gas remains resilient under a wide range of potential approaches to U.S. climate policy.

Source: EPPA, MIT Figure 3.8 Electricity Prices ($/kWh) under No-Policy and Regulatory Scenarios, Mean Gas Resources

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Po li cy (net of carbon ) Po li cy (incl. carbon ) No P olic y Regulato ry P olic y

Regulato ry P olic y0.00.20.40.60.81.0Chapter 3: System Studies 65 Currently world gas trade is concentrated in three regional markets: North America; Europe — served by Russia and Africa; and Asia — with a link to the Middle East. There are significant movements of gas within each of these markets, but limited trade among them.
Different pricing structures hold within these regional markets. For some transactions, prices are set in liquid competitive markets; in others they are dominated by contracts linking gas prices to prices of crude oil and oil products. As a result, gas prices can differ substantially among the regions.
These relatively isolated, regionalized markets could be sustained for many more decades. On the other hand, it is possible that LNG or pipeline transport could grow, linking these three regions, with the effect of increasing interregional gas competition, loosening price contracts tied to oil products and moderating the price deviations among the regions.
Such a process could go in many directions depending on the development of supply capacity by those nations with very large resources (mainly Russia and countries in the Middle East) or perhaps the expansion of non-conventional sources elsewhere. To the extent the structure evolves in this direction, however, there are major implications for U.S. natural gas production and use.
To investigate the end-effect of possible evolu

tion of an integrated global market akin to crude oil, we simulate a scenario where market integration and competition lead to equaliza

tion of gas prices among markets except for fixed differentials that reflect transport costs. In this scenario, gas suppliers and consumers are assumed to operate on an economic basis. That is, no effective gas cartel is formed, and suppliers exploit their gas resources for maxi

mum national economic gain.
Projected effects on U.S. production and trade are shown in Figure 3.9 for the 50% reduction and High, Mean and Low gas resources cases. This result may be compared with the Regional Markets case shown in Figure 3.3.
In 2020, U.S. net imports are lowered to 1.6 Tcf (versus 4.1 Tcf in the Regional Markets case). Because in the Integrated Global Market scenario the EPPA model resolves for the net trade only, a decrease in net imports might be interpreted as a potential for small gas exports from the U.S. while keeping imports constant. Beginning in the period 2020 to 2030, the cost of U.S. gas begins to rise above that of supplies from abroad and the U.S. becomes more dependent on imports of gas. In the Mean resource case, the U.S. depends on imports for about 50% of its gas by 2050 and U.S. gas use rises to near the level in the no-policy case, because prices are lower. As the emergence of an integrated global market would lead ulti

mately to greater reliance on imports, U.S. gas use — and prices — are much less affected by the level of domestic resources. Thus, the development of a highly integrated interna

tional market, with decisions about supply and imports made on an economic basis, would have complex effects: it would benefit the U.S. economically, limiting the development of domestic resources but would lead to growing import dependence. T HE RO LE O F I NT E RN A T I ON AL GAS MA R KE T S66 MIT S TU DY ON T HE F UTU RE O F N A TU RAL GA S Figure 3.9 U.S. Gas Use, Production and Imports & Exports (Tcf) and U.S. Gas Prices ($/1000 cf) for Low (L), Mean (M) and High (H) U.S. Resources, Price-Based Climate Policy and Global Gas Markets. Prices are shown without (top) and with (bottom) the emissions charge.

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Source: EPPA, MIT

In the Regional Markets case, global demand for gas increases from the current demand of about 100 Tcf, to about 150 Tcf by 2050. In the Integrated Global Markets scenario, gas avail

ability increases globally, reducing gas prices, and as a result, gas demand rises to about 190 Tcf in 2050. Figure 3.10 shows the projected increase in gas use. In the Regional Markets case, gas use in U.S. and Asia grows by around 50% from 2010 to 2050, while in Europe and countries of the former Soviet Union it increases by about 35%. Assumption of an Integrated Global Market changes the growth in Asia to 135%, while U.S. and European use grows by about 70%. A growth in the Rest of the World (ROW) is mostly driven by an increase in the gas usage in the Middle East and the rest of Americas, where assumptions about the different market structures affect the results to a lesser degree.Chapter 3: System Studies 67 Possible international gas trade flows that are consistent with U.S. and global demand under the Regional and Integrated Global Markets cases are shown in Figure 3.11. Under Regional Market conditions (Figure 3.11a), we can see that trade flows are large within gas market regions but small among them. To avoid a cluttered map, small trade flows (less than 1 Tcf) are not shown. Except for the “Middle East to Europe” flow of 1.8 Tcf, interregional movements among the three regions specified above are less than 0.6 Tcf in any direction in 2030.
Trade flows can be particularly sensitive to the development of transportation infrastructure and political considerations, and so projections of bilateral trade in gas are highly uncertain. The Regional Markets case tends to increase trade among partners where trade already exists, locking in patterns determined in part by historical political considerations.
If a highly integrated Global Market is assumed to develop (Figure 3.11b), a very different pattern of trade emerges. The U.S. is projected to import from the Middle East as well as from Canada and Russia, and movements from the Middle East to Asia and Europe would increase implying a substantial expansion of LNG — facilities. Russian gas would begin to move into Asian markets, via some combination of pipeline transport and LNG. Figure 3.10 Gas Use (Tcf) in Regional Markets (reg) and Integrated Global Markets (gl) scenarios for USA, Asia, Europe and former Soviet Union (EUR+FSU) and the Rest of the World (ROW)

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Source: EPPA, MIT68 MIT S TU DY ON T HE F UTU RE O F N A TU RAL GA S Figure 3.11 Major Trade Flows of Natural Gas among the EPPA Regions in 2030, No New Policy (Tcf)

3.11a Regional M arkets

Source: EPPA, MIT

Source: EPPA, MIT 3.11b Global M arketChapter 3: System Studies 69 The precise patterns of trade that might develop to 2030 and beyond will be influenced by the economics of the energy industry, as captured by the EPPA model, and also by national decisions regarding gas production, imports and transport infrastructure. There

fore, the numbers shown are subject to a number of uncertainties, prominent among which is the willingness of Middle East and Russian suppliers to produce and export on the modeled economic basis. 10 If potential supplies are not forthcoming, then global prices would be higher and the U.S. would import less than projected and perhaps increase exports. The broad insight to be drawn is nonetheless evident: to the degree that economics are allowed to determine the global gas market, trade in this fuel is set to increase over coming decades, with implications for investment and potential concerns about import dependence.
The assumptions about the gas markets also affect the carbon price and GDP impacts in the GHG mitigation scenario. While the difference is small initially (in 2030, a U.S. carbon price is decreased from $106 to $103 per ton CO 2 -e and U.S. GDP loss is decreased from 1.7% to 1.6%), it grows over time (in 2050, a U.S. carbon price is decreased from $240 to $180 and U.S. GDP loss is decreased from 3.5% to 2.6%). L ON GE R

- T E R M P RO SPE CT S F OR GAS UND E R D EEPE R EMISSI ON S CUT S
While current investment and policy decisions appropriately focus on a shorter horizon, policy decisions related to atmospheric stabilization of GHG concentrations inevitably involve a very long-term perspective. Though gas frequently is touted as a “bridge” to the future, continuing effort is needed to prepare for that future, lest the gift of greater domestic gas resources turn out to be a bridge with no landing point on the far bank.
To explore this issue, we conducted model simulations extending the horizon to 2100 assuming GHG emissions cuts that deepen to 80% below 2005 levels. The result is that, until gas with CCS begins to penetrate after 2060, the cost of CO 2 emissions from gas generation becomes too high to support its use in genera

tion (Figure 3.12). Nuclear is cheaper than coal or gas with CCS for much of the period and so it expands to meet the continuing electricity demand. Different cost assumptions well within the range of uncertainty would lead to a different mix of low-CO 2 generation sources, but the picture for gas without CCS would remain the same.

Figure 3.12 Energy Mix in Electric Generation under a Price-Based Climate Policy, Mean Natural Gas Resources and Regional Natural Gas Markets (TkWh)

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Source: EPPA, MIT70 MIT S TU DY ON T HE F UTU RE O F N A TU RAL GA S One implication of this longer-term experi

ment is that while we might rely on plentiful supplies of domestic gas in the near term, this must not detract us from preparing for a future with even One implication of this longer-term experiment is that while we might rely on plentiful supplies of domestic gas in the near term, this must not detract us from preparing for a future with even greater GHG emissions

constraints. Barriers to the expansion of nuclear power or coal and/or gas generation with CCS must be resolved over the next few decades so that over time these energy sources will be able to replace natural gas in power generation. Without such capability, it would not be possible to sustain an emissions mitiga

tion regime. CONC L U SI ON S
The outlook for gas over the next several decades is in general very favorable. In the electric generation sector, given the unproven and relatively high cost of other low-carbon generation alternatives, gas could well be the preferred alternative to coal.
A multi-sector GHG pricing policy would increase gas use in generation but reduce its use in other sectors, on balance increasing gas use substantially from the present level. A regula

tory approach, applied to renewable and coal use in the electric sector, could lead to even greater growth in gas use while having a more limited effect on national GHG emissions. Most important, in all cases studied — no new climate policy and a wide range of approaches to GHG mitigation — natural gas is positioned to play a growing role in the U.S. energy economy.
International gas resources are likely less costly than those in the U.S. except for the lowest-cost domestic shale resources, and the emergence of an integrated global gas market could result in significant U.S. gas imports.
The shale gas resource is a major contributor to domestic resources but far from a panacea over the longer term. Under deeper cuts in CO 2 emissions, cleaner technologies are needed. Gas can be an effective bridge to a lower CO 2 emissions future but investment in the develop

ment of still lower CO 2 technologies remains an important priority. 

## To the degree that economics are allowed to determine the global gas market, trade in this fuel is set to increase over coming decades, with implications for investment and import dependence.Chapter 3: System Studies 71 N OT ES

1 Citations to documentation of the EPPA model and features related to this study are provided in Paltsev, S., H. Jacoby, J. Reilly, O. Kragha, N. Winchester, J. Morris and S. Rausch, 2010: The Future of U.S. Natural Gas Production, Use, and Trade. MIT Joint Program on the Science and Policy of Global Change, Report 186 , Cambridge, MA. The USREP model is described by Rausch, S., G. Metcalf, J. Reilly and S. Paltsev, 2010: Distributional Impacts of Alternative U.S. Greenhouse Gas Control Measures. MIT Joint Program on the Science and Policy of Global Change, Report 185 , Cambridge, MA.

2 Reference costs from the U.S. EIA (see Appendix 3A). The lower sensitivity estimate is based on Update of the 2003 Future of Nuclear Power: An Interdisciplinary MIT study, Massachusetts Institute of Technology, Cambridge, MA.

3 Reference costs from the U.S. EIA (see Appendix 3A). The lower sensitivity estimate for coal with CCS draws on The Future of Coal: An Inter

disciplinary MIT study, Massachusetts Institute of Technology, Cambridge, MA; that for gas with CCS comes from McFarland, J., S. Paltsev and H. Jacoby, 2009: Analysis of the Coal Sector under Carbon Constraints, Journal of Policy Modeling , 31(1), 404–424.

4 LCOE is the cost per kWh that over the life of the plant fully recovers operating, fuel, capital and financial costs.

5 CO 2 equivalent emissions for all greenhouse gases are calculated using 100-year global warming potentials (GWPs). See Appendix 1A for discussion. The simulations in this chapter account for fugitive methane emissions from the gas supply system.

6 Because of the limited opportunities for gas-oil substitution the current price premium in the U.S. of oil products over gas (on an energy basis) is maintained and even grows over time. One substitution option not modeled here is the possibility of conversion of gas to liquids, which might become economic and perhaps be further stimulated by security concerns, even though making no contribution to CO 2 reduction. Such a development would raise U.S. gas use and prices, and lower oil demand with some moderating effect on the world oil price. 7 For more details about sensitivity tests see Paltsev, S., H. Jacoby, J. Reilly, Q. Ejaz, F. O’Sullivan, J. Morris, S. Rausch, N. Winchester and O. Kragha. 2010: The Future of U.S. Natural Gas Production, Use and Trade, MIT Joint Program on the Science and Policy of Global Change, Report 186 , Cambridge, MA.

8 Substitution for motor fuel is the likely target of possible expansion of gas-to-liquids tech nology (see Chapter 4). Its market penetration would depend on competition not only with oil products but also with direct gas use, biofuels and electricity which reduce CO 2 emissions while liquids from gas would not.

9 Gas production and use with the USREP model is somewhat lower than the EPPA projection. Compared to EPPA, the USREP model has the advantage of capturing inter-regional differ ences in coal and gas prices, and better reflecting differences in renewable costs among regions, but it does not represent foreign trading partners. This variation introduced by the different model structures is well within the range of other uncertainties.

10 For additional scenarios about the long-term

prospects for Russian natural gas, see Paltsev S., (2011). Russia’s Natural Gas Export Potential up to 2050. MIT Joint Program on the Science and Policy of Global Change Report (forthcoming).Chapter 4: Electricity 73 

# Chapter 4: Electric Power Generation

The low-carbon emissions and low capital cost of natural gas generation compared to other fossil fuel generation, combined with abundant gas supplies and current relatively low prices, make natural gas an attractive option in a carbon-constrained environment, such as that contemplated in the analysis in Chapter 3. In addition to its increasingly important role as a primary fuel for electricity generation, natural gas will continue to perform a unique function in the power sector by providing both baseload power and the system flexibility that is required to meet variation in power demand and supply from intermittent sources.
The focus of this chapter is on the role of natural gas in helping to reduce CO 2 emissions from the power sector and the interaction of gas use with projected growth in wind and solar generation. Natural gas provides flexibility to the power system largely through the three types of generation technologies: highly efficient natural gas com

bined cycle (NGCC) units, steam turbines, and gas turbines. Gas turbines are generally used to meet peak demand levels and to handle weather, time of day, seasonal and unexpected changes in demand. NGCCs and steam turbines can act as baseload or intermediate-load units, although the majority of gas capacity in the U.S. now operates in load-following (intermediate) or peaking service.
Currently, natural gas is second only to coal in total generation, fueling 23% of U.S. electricity production. Natural gas, however, has the highest percentage of nameplate 1 generation capacity of any fuel, at 41% compared to 31% for coal, which is the next highest (Figure 4.1). This difference between nameplate capacity and generation is INTRODUCT I ON

Figure 4.1 % Nameplate Capacity Compared to % Net Generation, U.S., 2009*

% Nameplate Capacity % Net Generation 41

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Natural GasPercentage (%)

Petroleum Coal Nuclear Hydroelectric Other Renewables Other

*Numbers are rounded Source: MIT from EIA data74 MIT S T UDY ON T H E FU T UR E O F N A T URAL GA S BOX 4.1 M O DELS EMPL O YED T O E X AMINE THE U.S. ELECTRICITY SYSTEM The MARKAL (MARKet ALlocation) model of the U.S. electricity sector enables a granular understanding of generation technologies, time-of-day and seasonal variations in electric

ity demand and the underlying uncertainties of demand. It was originally developed at Brookhaven National Laboratory (L.D. Hamilton, G. Goldstein, J.C. Lee, A. Manne, W. Marcuse, S.C. Morris, and C-O Wene, “MARKAL-MACRO: An Overview,” Brookhaven National Laboratory, #48377, November 1992). The database for the U.S. electric sector was developed by the National Risk Management Laboratory of the U.S. Environmental Protection Agency (EPA). The Renewable Energy Deployment System (ReEDS) model is used to project capacity expansions of generation, incorporating trans

mission network impacts, associated reliability considerations and dispatch of plants as operat

ing reserves. It also captures the stochastic nature of intermittent generation as well as temporal and spatial correlations in the generation mix and demand. It has been developed by the National Renewable Energy Laboratory (NREL) (J. Logan, P. Sullivan, W. Short, L. Bird, T.L. James, M. R. Shah, “Evaluating a Proposed 20% National Renewable Portfolio Standard,” 35 pp. NREL Report No. TP-6A2-45161, 2009). The Memphis model realistically simulates the hourly operation of existing generation plants in the presence of significant volumes of wind and solar generation. It was developed by the Institute for Research in Technology of Comillas University (Madrid, Spain) for the Spanish Electricity Transmission System Operator (Red Eléctrica de España) to integrate renewable energies. (A. Ramos, K. Dietrich, J.M. Latorre, L. Olmos, I.J. Pérez-Arriaga, “Sequential Stochastic Unit Commitment for Large-Scale Integration of RES and Emerging Technologies,” 20th Interna

tional Symposium of Mathematical Program

ming (ISMP) Chicago, IL, USA, August 2009. http://www.iit.upcomillas.es/~aramos/ROM.htm explained in part by the overbuilding of NGCC units in the mid-1990s. It also shows that NGCC units are operating well below their optimum operating value. Finally, it highlights the unique role of gas and steam turbines, which in 2009 had an average capacity factor of 10% (see Table 4.1). This low-capacity factor illustrates the peaking function of these units, particularly the gas turbines, that are routinely used only to meet peak demand levels and which, absent break

throughs in storage, are essential for following time-varying electricity demand and accom

modating the intermittency associated with wind and solar power.
Historically, because of its higher fuel price compared with nuclear, coal and renewables, natural gas has typically had the highest marginal cost and has been dispatched after other generation sources. Consequently, natural gas has set the clearing price for electricity in much of the country. Lower natural gas prices, the opportunities created by abundant relatively low-cost supplies of unconventional shale gas, increased coal costs and impending environmental regulations that will add to the cost of coal generation are, however, changing the role of gas in power generation.

The Emissions Prediction and Policy Analysis (EPPA) model employed in Chapter 3 is designed to study multi-sector, multi-region effects of alternative policy and technology assumptions, and as a result it only approxi

mates the complexities of electric system dispatch. In this chapter, we analyze in greater depth two of the cases studied there, employing a more detailed model of the electric sector — MARKAL (see Box 4.1). This model is also used to further explore the implications of uncertainty in fuel and technology choices as they influence natural gas demand in this sector, extending the uncertainty analysis in Chapter 3 which considers only the uncer

tainty in gas resources.Chapter 4: Electricity 75 This chapter then considers two questions about gas use in U.S. power generation: (1) What is the potential for reducing CO 2 by changing the current generation dispatch order 2 to favor NGCC over coal generation? (2) What will be the effect of increased penetration of wind and solar generation on natural gas power generation?
To answer the first question it is important to understand NGCC utilization patterns. NGGC units are designed to be operated at capacity factors of up to around 85% rather than the current national average of 42%. This suggests possible opportunities for displacing some coal with gas generation, thereby lowering CO 2 emissions from the sector. We examine how much of this capacity could actually be applied to this purpose without diminishing system reliability. An important by-product of such a change, also analyzed, would be associated reductions in criteria pollutant emissions.
To explore the second question, the interaction between intermittent renewables and natural gas use is analyzed from two viewpoints: one in the short term when additional intermittent capacity is introduced into a system with other sources fixed; and the other in the longer term when the overall supply structure has time to adjust to growth in intermittent capacity. In this regard, we note that, at a more granular level than is presented in Table 4.1, wind turbines have an average capacity factor of 27%, solar thermal, 19%, and solar PV, 14%, and gas combustion turbines and steam turbines (used to balance load) have average capacity factors of 5% and 14%, respectively. 3 Study of these two questions is approached with the use of two additional electric sector models, each designed to simulate the power system and its operations in detail over a range of conditions and timescales (see Box 4.1), enabling the following analyses:

s !N EXAMINATION OF RELIABILITY AND TRANSMIS

sion constraints, which helps to isolate and understand the total generation required at points in time to meet demand for electricity and maintain operating reserve capacity and adequate installed capacity margins. We employ ReEDS for this analysis, which uses multiple time periods for any given year and reports results by geographic regions.

s !N EXPLORATION OF ANNUAL SCENARIOS AT THE

hourly level, which takes into consideration details of real-time problems, such as uncer

tainty and variability in demand and in generation patterns for intermittent tech

nologies, and start-up and shut-down char acteristics for plant cycling. Here we use the Memphis model. Coal Petroleum Natural Gas CC Natural Gas Other Nuclear Hydroelectric Conventional Other Renewables All Energy Sources
64 8 42 10 90 40 34 45 Table 4.1 2009 Average Capacity Factors by Select Energy Source, U.S. (numbers rounded)

Source: EIA, Table 5.2, Average Capacity Factors by Energy Source76 MIT S T UDY ON T H E FU T UR E O F N A T URAL GA S ELE CTR I C I T Y SYS T EM O VE R VIEW
The electricity system is complex; this overview of how the system works, including the regimes under which power plants operate and the hierarchy of decision-making that influences the capacity and generation mixes, is intended to enhance the understanding of the implica

tions of the modeling and analysis discussed later in the chapter.
Electricity is produced from diverse energy sources, varied technologies and at all scales. Sources for electric generation include a mix of renewables (sun, wind, hydro resources, among others), fossil fuels (oil, natural gas, coal) and uranium. As such, the generation of electricity comprises a variety of technologies with the type of fuel being used, and characterized by a wide range of investment and operating costs. Conventional power plants are operated under different regimes, mainly depending on their variable operating costs and operating flexibility. 4

s Baseload plants are characterized by expensive

capital costs and low variable costs, and they are operated most of the time during the year. They tend to be inflexible plants as they cannot easily change their operational level over a wide usage.

s Peaking plants are characterized by low

capital costs and higher variable costs, and they are operated a few hours per year when the electric load is the highest. They can be characterized as flexible plants because of their quick operating response.

s Intermediate plants have variable costs that

fall in between those of peaking and baseload technologies, and they are operated accord

ingly. They can be characterized as cycling plants, i.e., plants that operate at varying levels during the course of the day and perhaps shut down during nights and weekends. The expansion planning and operation of electric power systems involve several decisions at different timescales, generally based on economic efficiency and system reliability criteria. This process has a hierarchical structure, where the solutions adopted at higher levels are passed on to the lower levels incorporating technical or operational restrictions at that level: 5

s Long-term decisions are part of a multi-year

process (3 years up to 10 or more years) that involves investments in generation and network required to expand the system.

s Medium-term decisions are taken once the

expansion decisions have been made. They are part of an annual process (up to 3 years) that determines the generation unit and grid maintenance schedule, fuel procurement and long-term hydro resource scheduling.

s Short-term decisions are a taken on a weekly

time frame. They determine the hourly production of thermal and hydroelectric plants for each day of the week (or month), subject to availability of the plants and to hydro production quotas determined at the upper decision level, and considering not only variable operating costs, but also the technology’s own technical characteristics such as start-up and shut-down cost and conditions, a plant’s technical minima and ramping times. In addition, these short-term decisions are subject to generating reserve capacity needed to immediately respond to unexpected events.

s Real-time decisions involve the actual opera

tion of the system (seconds to minutes). They involve the economic dispatch of generation units, the control of frequency so that pro duc tion and demand are kept in balance at all times, while maintaining the system components within prescribed safe tolerances of voltages and power flows, accounting also for possible contingencies.Chapter 4: Electricity 77 Finally, meeting reliably the consumption of electric power at all times requires having both adequate installed capacity and secure opera

tion procedures. A reliable operation involves using ancillary services at different levels, maintaining sufficient capacity in reserve (quick-start units, spinning reserves) and with enough flexibility to respond to deviations in the forecast of demand or intermittent genera

tion, and to unexpected events, such as the sudden loss of lines or generation plants.

T HE RO LE O F GAS GE N E R A T I ON UND E R A CO 2 LIMI T
The EPPA model simulations in Chapter 3 provide insights into both the economy-wide use of natural gas and its market share in electric power under various assumptions about greenhouse gas (GHG) mitigation. Application of the MARKAL model, with its greater electric sector detail, provides a check on the adequacy of the EPPA approximations for the power sector. MARKAL considers a more complete listing of the generation alter

natives, and it addresses the variation in the level of electricity demand, as a result of the diurnal, weekly and seasonal cycles (which EPPA only roughly approximates). This varia

tion is important because different technologies are needed to run different numbers of hours per year — a pattern that changes over years with demand growth and new investment. Also, the MARKAL model allows for a more com

plete exploration of uncertainty in gas use in the power sector. For consistency with the analysis in Chapter 3, certain MARKAL inputs are taken from the EPPA model results, including electricity demand, supply curves for natural gas and coal and the reference costs of generation technolo

gies. Also, two of the same policy cases are considered: Scenario A, which assumes no new GHG policy; and Scenario B, which imposes a Price-Based mitigation measure. For the Price-Based case, a cap on CO 2 emissions for the electric sector in MARKAL is set based on the results for that scenario in Chapter 3.
The underlying technology mix computed by the more-detailed electric sector model can be illustrated by annual load duration curves, which show the mix of generation dispatched at different times to meet changes in the level of electricity demand in the contiguous U.S. electric system over the course of a year. These curves for the year 2030, with and without a policy of carbon constraints, are shown in Figure 4.2. In the absence of a carbon policy (Panel a), generation from hydro, coal and nuclear occur at all times of the year while generation from wind and hydro are supplied whenever they are available. 6
Without a carbon policy (Panel a), natural gas generation from combined cycle and steam turbines occurs for less than half of the time over the course of the year during periods of higher demand; and natural gas combustion turbines are used for only a few hours per year at the peak demand hours.
Under the carbon price policy (Panel b), NGCC technology largely substitutes for coal to provide baseload generation along with nuclear generation.78 MIT S T UDY ON T H E FU T UR E O F N A T URAL GA S Figure 4.2 Time blocks approximation to the Load Duration Curve for the (a) No Policy and (b) 50% Carbon Reduction Policy Scenarios in 2030. Three seasons have been con

sidered: summer, winter and spring/autumn. Within each season, there are four blocks: peak time, daytime PM, daytime AM, and nighttime, as shown in the graphs. The peak time block is very narrow.

Source: MIT analysis 0 0 2000 4000 Hours 6000 8000 200 400 600 800 1000 1200

800 1000

700 750 950

850 900

Summer Winter Spring & Autumn Solar Oil Landfill Geothermal Diesel
Biomass Municipal Waste
Gas Steam Gas Combustion Turbine Gas Combined Cycle Wind Coal Steam Hydro Nuclear

0 2000 4000 Hours 6000 8000

Summer Winter Spring & Autumn 0 200 400 600 800 1000

700

600 650 750 800 4.2a

4.2bGWGWChapter 4: Electricity 79 The change over time in the energy mix in the electric sector is shown in Figure 4.3 for both the No Policy and the Price-Based cases. In the No Policy case, under reference assumptions for fuel prices, electricity demand and technology costs — and mean gas resources — these results show the same pattern of increasing gas use as the simulation studies in Chapter 3. The gas use in this sector in 2025 is essentially the same in the two studies. Toward the end of the simula

tion period, MARKAL projects one-quarter to one-third more gas-based generation than EPPA, though gas generation is still small relative to coal.
Under the Price-Based policy the overall pattern of change remains the same as in EPPA: coal is forced out and replaced by gas. In the period to 2025 MARKAL projects a more rapid phase-out of coal than does EPPA, in part because MARKAL is a forward-looking model and sees higher prices in the future whereas the recursive dynamic (myopic) EPPA model does not. Farther out in time coal is no longer in the mix, and under a continuously tightening CO 2 constraint conventional gas generation begins to be replaced by non-carbon generation sources such as nuclear, renewables and/or coal or gas with carbon capture and sequestration (CCS).
The EPPA model expands nuclear generation whereas MARKAL introduces natural gas with CCS, yielding about a one-quarter greater level of gas use. The outlook for gas in this sector is consistently positive across the two studies, and the difference in details of load dispatch is to be expected for models of such different math

ematical structure, and well below the level of uncertainty in either (see Figure 4.3).

Source: MIT Analysis Figure 4.3 Future Energy Mix in Electricity Sector

Figure 4.3a With No Climate Policy Figure 4.3b With Price-Based Climate Policy

Others Renewable Hydro Nuclear Natural Gas Coal

0 1 2 3 4 5 6 7Electricity generation (TkWh)

2010 2015 2020 2025 2030 2035 2040 2045 2050 2010 2015 2020 2025 2030 2035 2040 2045 2050 0 1 2 3 4 5 6 7Electricity generation (TkWh)80 MIT S T UDY ON T H E FU T UR E O F N A T URAL GA S The systems studies in Chapter 3 consider only uncertainty in the estimates of gas resources (Figures 3.2, 3.3 and 3.0). Applying the MARKAL model and the reference assumptions discussed above, a study was carried out of the effect on gas use of uncertainties not only in resources but in other prices, electricity demand and technology costs. The same two cases were considered: No Policy; and the Price-Based policy. Here we describe results for a 50% confidence interval: i.e., a 25% chance of gas use above the high level as shown, and a 25% chance of use below the low level. Details of the analysis are provided in Appendix 4B.
By 2030, with no additional mitigation policy, the gas demand by the electric sector runs 17% above and 19% below the mean value of 6.3 trillion square feet (Tcf) (50% confidence interval). The main factors leading to this range are the demand for electricity, the prices of natural gas and coal and the costs of new technologies, in particular the cost of new coal steam and IGCC technologies.
Under the Price-Based policy the uncertainty is substantially greater, ranging from 47% above to 42% below the mean value of 12.8 Tcf (50% confidence interval). The main influence behind this greater uncertainty is in the costs of technologies that might substitute at large scale for fossil-based generation, such as wind, solar and advanced nuclear generation technologies. The share of natural gas in the generation mix is a result of the interplay between technologies that both compete with and complement each other at the same time as they supply different segments of demand over the year.
The uncertainty ranges given here are intended to caution the reader against giving too much weight to the actual numbers in future projec

tions in this chapter and elsewhere in the report. Rather, the critical insights are about the trends and relationships, which are more robust across a wide range of possible futures. N EA R

- T E R M O PP ORTUN I T IES F OR R E DUC I N G CO 2 EMISSI ON S BY E N VI RON ME NT AL D ISPA TC H
Near-term opportunities for CO 2 emission reductions in the power sector are limited by the current generation mix and transmission infrastructure, the cost of renewables and other low-emission sources and technologies, as well as the lag times associated with siting and building any new generation capacity. The re-ordering of generation between coal and gas units (modeled here as a form of environmental dispatch forced by a CO 2 constraint 7 ) may be the only option for large-scale CO 2 emissions reduction from the power sector which is both currently available and relatively inexpensive.

As noted, the current fleet of NGCC units has an average capacity factor of 41%, relative to a design performance of approximately 85%. An electric system requires capacity to meet peak demands occurring only a few hours per year, plus an operating reserve, so the system always includes some generation units that run at capacity factors below their design value. However, the U.S. has enough spare capacity in other technologies to allow dispatching more NGCC generation, displacing coal and reduc

ing CO 2 emissions, without major capital investment. An additional benefit of this approach would be to substantially reduce emissions of air pollutants such as sulfur dioxide (SO 2 ), nitrogen oxide (NOx), mercury (Hg) and particulates.
NGCC Potential if Fully Dispatched
Figure 4.4 suggests the scale and location of the potential for shifting among generation units. Plotted there is the geographic distribution of fully-dispatched NGCC potential (FDNP), defined as the difference between the electricity that would be produced by NGCC plants at an 85% capacity factor and their actual 2008 generation. Figure 4.4 also shows the geographic distribution of coal generation, divided intoChapter 4: Electricity 81 Figure 4.4 Scale and Location of Fully Dispatched NGCC Potential (FDNP) and Coal Generation (MWh, 2008)

Source: USREP, MIT

less and more efficient units where a “less efficient” unit is defined as one with a heat rate over 10,000 Btu/kWh.
In many regions FDNP generation matches well with less efficient coal capacity, suggesting opportunities for displacing emissions-intensive units, while other locations show few such opportunities. For example, Southeastern states such as Texas, Louisiana, Mississippi, Alabama and Florida appear to have relatively larger opportunities, while those in Midwestern states such as Illinois, Indiana and Ohio are relatively smaller. Possible Contribution of NGCC Capacity to a CO 2 Reduction Goal
Figure 4.4 represents only the average potential available over the course of the year, aggregated by state, therefore providing an upper limit of the substitution potential; it does not equate to “surplus” generation capacity. For this discussion, “surplus” is defined as the amount of NGCC generation that can be used over the course of one year to replace coal while respecting transmission limits, operation constraints and demand levels at any given time.82 MIT S T UDY ON T H E FU T UR E O F N A T URAL GA S To account for a number of system charac

teristics that may better identify the range of opportunities for fuel substitution, we apply the ReEDS model (see Box 4.1). This model is well suited for examination of reliability and transmission constraints, demand fluctuations and reserve capacity margins that will limit these opportunities. Also, as noted, ReEDS reports results by geographic regions. 8
This enables us to identify opportunities to change the fuel dispatch order nationwide, and provides insights into five regions of the country: the Electric Reliability Council of Texas (ERCOT), Midwest Independent Trans

mission Operator (MISO), PennsylvaniaNew Jersey-Maryland (PJM), New England (ISO-NE) and Florida Reliability Coordinating Council (FRCC). Each region has different generation costs, fuel mixes and ability to trade electricity:

s %2#/4 IS ESSENTIALLY ELECTRICALLY ISOLATED

from the rest of the country; s -)3/ AND 0*- ARE HEAVILY INTERCONNECTED they import and export electricity from each other, but have a relatively small amount of NGCC surplus;

s )3/
.% AND &2## HAVE SURPLUS .'##

but New England has relatively little coal generation, whereas Florida has a significant percentage of inefficient coal capacity that might be a candidate for displacement.
We analyze the potential for a version of environmental dispatch by running the ReEDS model for the year 2012 in three scenarios: CO 2 unconstrained, a 10% reduction in U.S. electric sector CO 2 emissions, and a 20% reduction. Runs for the year 2012 are used because the model does not invest in new capacity in this time period; as such, CO 2 reductions are attributable to shift of generation among existing units.
Figure 4.5 illustrates the changes in generation by technology under the three scenarios. In the 20% CO 2 reduction scenario, the NGCC fleet has an average capacity factor of 87%, displaces

Source: MIT Analysis Figure 4.5 Generation by Technology under Various CO 2 Constraints, U.S. 9 , 2012

Coal Gas-CC 0 500 1,000 1,500 2,000 2,500

20.0 Base Case 10% CO 2 Reduction 20% CO 2 ReductionGeneration (TWh)

Wind Nuclear Hydroelectric Other*Chapter 4: Electricity 83 about one-third of 2012 coal generation (700 terawatt-hours (TWh)) and increases gas consumption by 4 Tcf. 9
In Figure 4.5, as the carbon constraint increases, most of the electricity generation by tech nology does not change. Coal and natural gas are the exceptions: as the carbon constraint increases, coal generation significantly declines, and NGCC proportionally increases.
Although NGCC displacement of coal genera

tion is nearly one-for-one at the national level, the change in generation and emissions is not uniform across regions. Figure 4.6 shows regional results, comparing coal generation in the absence of a CO 2 target to surplus NGCC generation in a 20% reduction scenario.
In Figure 4.6, the left bars represent the amount of regional coal generation absent carbon constraints, using ReEDS 2012 forecasts. This is the “business as usual” scenario. The right bars represent the amount of additional NGCC generation that is available for dispatch in the current system after satisfying all system require

ments. This additional amount of generation is calculated as the difference between the NGCC generation dispatched in the base case and in the 20% CO 2 reduction scenario. The largest potential for substitution of NGCC for coal generation is in PJM, although in both PJM and MISO coal continues to dominate.
A closer look at how the imposition of a CO 2 limit would shift generation among units can be seen in the revised unit dispatch at different demand levels. For this analysis, we look at ERCOT, a system that is isolated from the rest of the U.S. and, in our re-dispatch scenarios, has regional percentage of CO 2 reductions that tracks national reductions. Because of these similarities to the country, and because of the greater availability of operations information from ERCOT, an analysis of ERCOT, using Source: MIT Analysis Figure 4.6 NGCC and Coal Generation in Select Regions under a 20% CO 2 Constraint, U.S., 2012

Coal (base case) Gas Surplus 0 100 200 300 400 500 600

20.0 16: MISO 23: PJM 32: ISO-NEGeneration (TWh)

21: ERCOT 29: FRCC84 MIT S T UDY ON T H E FU T UR E O F N A T URAL GA S ReEDS provides additional details about fuel switching on a more granular timescale.
Figure 4.7 illustrates how existing capacity would be dispatched to meet 2012 projected demand for the highest peak, average and low demand situations, with and without the CO 2 target to force a change in unit dispatch. 10 The figure shows an unconstrained base case and a case with a 20% CO 2 reduction. The average profile shows the generation dispatch for all technologies across an entire year (8,760 hours), not a single time slice. In Figure 4.7, the red line represents 17 time periods of demand for the year, sorted from greatest to least demand. The bar graphs to the right of the nameplate capacity bar show the dispatch profile in those time periods under two carbon scenarios: no reduction and 20% reduction.
Not surprisingly, the results indicate that the greatest opportunities for displacement of coal generation exist during average and low demand periods. Figure 4.7 also shows that coal generation is dispatched in every time period, indicating that not enough NGCC surplus exists in ERCOT to completely displace coal; Figure 4.7 Changes in Dispatch Order to Meet ERCOT’s 2012 Demand Profile, with and without a 20% CO 2 Constraint

0 10,000 20,000 30,000 40,000 50,000 60,000 70,000 80,000 90,000

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 Oil-Gas-Steam Turbine
Natural Gas – Combustion Turbine Natural Gas – Combined Cycle
Coal
Wind Hydro
Nuclear MW

Annual load duration curve

Bar graphs represent dispatch profile Nameplate

capacity
Super peak demand – 40 hrs total Late summer afternoons Average annual dispatch profile – over 8,760 hrs Low demand – 736 hrs total Typical spring nights Base Fuel Switch Base Fuel Switch Base Fuel Switch

Source: MIT AnalysisChapter 4: Electricity 85 conversely, surplus NGCC capacity exists and can displace some coal capacity in all demand periods examined, even during the super peak, although the amount is small.
Effect of System Re-Dispatch on Criteria Pollutants
The Clean Air Act (CAA) requires power plant controls on SO 2 , NOx, particulates and Hg. According to the EPA, “60% of the uncon

trolled power plant units are 31 years or older, [some] lack advanced controls for SO 2 and NOx, and approximately 100 gigawatts (GW) out of total of [more than 300] GW of coal are without SO 2 scrubbers.” 11

Table 4.2 contains results from ReEDS under the three scenarios that indicate the potential effects of the CO 2 constraint (also shown) on emissions of SO 2 , NOx and Hg. (The model does not project particulate emissions, which also would be reduced.) While ReEDS does not fully model the trading markets for SO 2 and NOx, it makes a reasonable approximation by capping national emissions levels and making economically efficient dispatch decisions under these constraints. In all three simulations the cap for SO 2 emissions is based on the 2005 Clean Air Interstate Rule (CAIR) interpolated for 2012. 12 Changes to the dispatch order of generation, from coal to gas, would lower prices in the SO 2 market, and might even yield a reduction in national emissions below the CAIR limit, as shown with a 4% change in Case 2. Impor

tantly, the reductions in NOx and Hg emissions could be substantial, by as much as one-third under the more stringent CO 2 limit.
Table 4.3 shows the corresponding emissions profiles by region for CO 2 and Hg. (ReEDS does not provide adequate regional detail for SO 2 and NOx). Each region acts in its own best economic interests under the given constraints. And, because of variation in generation costs, installed capacity and transmission differences between regions, some regions have compara

tive advantage dispatching less CO 2 intensive generation. Depending on the regulatory structure, regions with these advantages may produce more electricity, export it and/or sell credits (assuming a cap-and-trade approach); and regions which typically deploy technologies that are more CO 2 intensive take opposite actions. This leads to uneven emissions effects on individual regions.

A 20% emissions reduction in electric sector CO 2 emissions through coal-to-gas displace

ment would represent mitigation of 8% of the U.S. total. The ReEDS model does not provide Base Case Case 1 – 10% CO 2 Reduction Case 2 – 20% CO 2 Reduction % Reduction from Base Case for Case 1 % Reduction from Base Case for Case 2
CO 2 (million metric tons) 2,100 1,890 1,680 SO 2 (million tons) 5.66 5.66 5.46

— 4% NOx (million tons) 4.66 3.92 3.16 16% 32% Hg (tons) 48 40 32 17% 33%
Source: MIT analysis Table 4.2 National Emissions for CO 2 -Reduction Scenarios86 MIT S T UDY ON T H E FU T UR E O F N A T URAL GA S an accurate estimate of the national economic cost of this option, but an approximation can be made by comparing the break-even CO 2 price at which the cost of NGCC generation equals the cost of coal generation, given their different variable operations and maintenance costs, heat rates and CO 2 emissions rates. 13 The result is an implicit cost of about $16 per ton CO 2 . More analysis is required to determine whether, because of the geographic differences between NGCC and coal units, some new transmission infrastructure may be necessary. Nonetheless, a more complete analysis is very likely to prove the cost of this option to be low compared to most other mitigation options. For example, one estimate of the per-ton CO 2 emissions avoidance cost estimate to retrofit a typical sub-critical coal plant with post-combustion CSS is $74 per ton. 14
It should also be noted that coal-to-gas fuel switching is already occurring. According to the Energy Information Agency (EIA), “The increase in delivered coal prices and the decrease in delivered natural gas prices, combined with surplus capacity at highly efficient gas-fired combined-cycle plants resulted in coal-to-gas fuel switching. Nationwide, coal-fired electric power generation declined 11.6 percent from 2008 to 2009, bringing coal’s share of the electricity power output to 44.5 percent, the lowest level since 1978.” 15
In sum, there is sufficient surplus NGCC capacity to displace roughly one-third of U.S. coal generation, reducing CO 2 emissions from the power sector by 20% and yielding a major contribution to control of criteria pollutants. This would require an incremental 4 Tcf per year of natural gas, which corresponds to a cost of $16 per ton of CO 2 . Currently there is no national price on CO 2 , but there are both regional programs and federal regulatory activities underway.

R E C O MMENDATI O N The displacement of coal generation with NGCC generation should be pursued as the most practical near-term option for significantly reducing C O 2 emissions from power generation. Base Case MISO ERCOT PJM FRCC ISO-NE CO 2 (million metric tons) 543 153 446 67.2 19 Hg (tons) 13.4 2.77 11 1.32 0.138

Case 2 – 20% CO 2 Reduction CO 2 (million metric tons) 394 121 351 78.9 25.4 Hg (tons) 9.30 1.43 7.58 1.13 0.10 % Hg reduction 31% 48% 31% 14% 27%
Source: MIT Analysis Table 4.3 Emissions of Select Regions Before and After Re-Dispatch, 2012



## There is sufficient surplus NGCC capacity to displace roughly one-third of U.S. coal generation, reducing CO 2 

## emissions from the power sector by 20% and yielding a major contribution to control of criteria pollutants. This would require an incremental 4 Tcf per year of natural gas, which corresponds to a cost of $16 per ton of CO 2 

## .Chapter 4: Electricity 87 I NT E R MI TT E NT R E N EWABLE ELE CTR I C I T Y S OURC ES A ND N A TUR AL GAS D EMA ND
In this section, we explore the impacts of the introduction of significant amounts of inter

mittent wind and solar electricity generation on natural gas generation and overall natural gas demand.
This analysis first explores the short-term effects of intermittent wind and solar generation on gas generation and demand, a scenario which assumes that the capacity from technologies — other than wind or solar — is fixed. Some European countries already approximate this situation, where substantial volumes of wind or solar generation have been installed during the last few years. Also in some U.S. states, the proportion of intermittent generation exceeds 10% and the dispatch of existing conventional generation units has had to adjust accordingly.

We then turn to longer-term impacts , where the deployment of intermittent generation is assumed to take place gradually, possibly in response to government policies that, for example, set a mandatory target for renewable generation. Over time, capacity additions and retirements of other technologies are made as the system adjusts to intermittent generation. Effects in the Short Term

To elucidate the short-term effects , we use:

s A  PROJECTED GENERATION PORTFOLIO AS THE

base case, obtained from the ReEDS CO 2 Price-Based policy scenario (see Box 4.1); and

s THE -EMPHIS MODEL SEE "OX  APPLIED TO

daily dispatch patterns for ERCOT which, as noted earlier, is an isolated system that can be studied without the complicating influence of inter-regional transmission.
With this 2030 generation portfolio as our reference point, we examine the daily dispatch patterns of all generation technologies, includ

ing natural gas, when greater or lesser levels of wind or solar electricity generation are made available to be dispatched and the capacities of the other technologies are held constant.
Wind generation. The results for varying levels of wind generation are seen in:

s &IGURE A THE BASE CASE WHICH IS A represen

tative day for ERCOT;

s &IGURE B WHEN WIND PRODUCES half the

amount of generation as in the base case; and

s &IGURE C WHERE WIND PRODUCES twice the

amount of generation as in the base case.88 MIT S T UDY ON T H E FU T UR E O F N A T URAL GA S Figure 4.8 Impact of Wind on a One-Day Dispatch Pattern for ERCOT

60,000

50,000

40,000

30,000

20,000

10,000

0Production (MW)h01h02h03h04h05h06h07h08h09h10h11h12h13h14h15h16h17h18h19h20h21h22h23h24 4.8b Wind 0.5

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0Production (MW)h01h02h03h04h05h06h07h08h09h10h11h12h13h14h15h16h17h18h19h20h21h22h23h24 4.8c Wind 2.0

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0Production (MW)h01h02h03h04h05h06h07h08h09h10h11h12h13h14h15h16h17h18h19h20h21h22h23h24

Hydro
Solar
Gas GT
Gas CCGT
Gas CCGT CCS
Biomass
Coal
Wind
Nuclear 4.8a Wind Base Case

Hydro
Solar
Natural Gas – Gas Turbine
Natural Gas – Combined Cycle Integrated Gasi ! cation Combined Cycle with CCS
Biomass
Coal
Wind
Nuclear

Source: MIT AnalysisChapter 4: Electricity 89 In Figure 4.8a, the base case depicts the esti

mated existing contribution from wind in ERCOT in 2030. The nighttime load (roughly hours 01 through 04) is met by nuclear and coal baseload plus wind generation. There is no appreciable output from gas between hours 01 and 04 because it has higher variable costs than nuclear and coal and it gets dispatched last. Natural gas also has the flexibility to cycle. In hours 05 through 23, when overall demand increases during the early morning and decreases in the late evening, NGCC generation adjusts to match the differences in demand.
As depicted in Panel 4.8b, when less wind is dispatched, the NGCC capacity is more fully employed to meet the demand, and the cycling of these plants is significantly reduced. The baseload plants continue to generate at full capacity.

In Panel 4.8c with twice as much wind as the base case, natural gas generation is reduced significantly; the gas capacity that is actually used is forced to cycle completely. Baseload coal plants are also forced to cycle because of the relatively low nighttime demand; coal plant cycling can increase CO 2 , SO 2 and NOx emissions. 16

Solar Generation. Like wind, for solar there are figures depicting: a base case in ERCOT (Figure 4.9a); a case where solar provides half the amount of generation as the base case (Figure 4.9b); and a case where solar provides twice the generation seen in the base case (Figure 4.9c). The pattern with solar is somewhat different than for wind. The solar generation output basically coincides with the period of high demand, roughly between hours 06 and 22. As seen in the base case Figure 4.9a, this is also when NGCC capacity gets dispatched. The natural gas plants are used more when solar output is less (see Figure 4.9b). Conversely, when solar is used more, less gas is dispatched (see Figure 4.9c).
The baseload plants are largely unaffected and cycling is not a problem for them, since there is no intermittent solar-based generation during the low-demand night hours.
In sum, our short-term analysis shows that the most significant impacts of a quick deployment of additional wind or solar at any given future year will most likely be both a reduction in production from, and an increase in cycling of, gas-fueled NGCC plants; there is a less significant fall in production for the much-less-employed, single-cycle gas turbines and steam gas units.

The displacement of gas is greater for solar than for wind, since solar production has a stronger correlation with demand than does wind generation.
Large wind penetrations may also displace some coal production and result in some cycling of these plants. No impact on nuclear production is expected with the average U.S. technology mix. 

## [In the short term]....the most significant impacts of a quick deployment of additional wind or solar ... will most likely be both a reduction in production from, and an increase in cycling of, gas-fueled NGCC plants....90 MIT S T UDY ON T H E FU T UR E O F N A T URAL GA S Figure 4.9 Impact of Solar CSP (no storage) on One-day Dispatch Pattern for ERCOT

60,000

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0Production (MW)h01h02h03h04h05h06h07h08h09h10h11h12h13h14h15h16h17h18h19h20h21h22h23h24

Hydro
Solar
Gas GT
Gas CCGT
Gas CCGT CCS
Biomass
Coal
Wind
Nuclear 4.9b Solar Base Case x 0.5

Solar Hydro
Biomass
Gas – GT
Gas – CCGT CCS
Gas – CCGT
Coal – IGCC CCS
Coal – Old Biomass
Coal – Old NoScrub
Wind
Nuclear

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0Production (MW)h01h02h03h04h05h06h07h08h09h10h11h12h13h14h15h16h17h18h19h20h21h22h23h24

Hydro
Solar
Gas GT
Gas CCGT
Gas CCGT CCS
Biomass
Coal
Wind
Nuclear 4.9c Solar Base Case x 2.0

Solar Hydro
Biomass
Gas – GT
Gas – CCGT CCS
Gas – CCGT
Coal – IGCC CCS
Coal – Old Biomass
Coal – Old NoScrub
Wind
Nuclear 60,000

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0Production (MW)h01h02h03h04h05h06h07h08h09h10h11h12h13h14h15h16h17h18h19h20h21h22h23h24

Hydro
Solar
Gas GT
Gas CCGT
Gas CCGT CCS
Biomass
Coal
Wind
Nuclear 4.9a Solar Base Case

Solar Hydro
Biomass
Gas – GT
Gas – CCGT CCS
Gas – CCGT
Coal – IGCC CCS
Coal – Old Biomass
Coal – Old NoScrub
Wind
Nuclear

Source: MIT AnalysisChapter 4: Electricity 91 Effects in the Long Term
To explore the effects of the penetration of intermittent generation over the long term , we examine two policy scenarios, both with a system expansion to 2050 and a target leading to a 70% reduction of CO 2 emissions in the U.S. power sector.

We look at two different versions of the 70% reduction case because the means by which the target is implemented — through different mitigation policy instruments — has an effect on how the system responds to more or less expensive renewable generation. The two policy instruments we examine are:

s THE IMPOSITION OF A CO 2 price to achieve the CO 2 emissions reduction target; and

s THE IMPOSITION OF AN emissions constraint

to achieve the same target.
We then analyze how the electric system, and gas use over time, would differ if the capital costs of solar or wind generation capacity were higher or lower than the reference levels for the two base cases. Again the ReEDS model is employed. 17
In the ReEDs simulations of both policy scenarios, the generation mix evolves over time, similar to that shown in Chapter 3, Figures 3.4a and 3.4b. During the early-to-middle decades of the simulation period the dominant event is the substitution of coal generation by NGCC units. At the same time, wind generators, with gas turbine back-up, begin to be deployed as a baseload technology. 18 This combination of wind production and flexible generation capacity competes with potential new nuclear capacity and also erodes NGCC production. Wind impacts the preferred new baseload generation technology, the one that is most economic but for which expansion is not subject to environmental or other limits. Late in the period, conventional coal production has been replaced, economically-competitive wind resources start becoming exhausted and nuclear plus some solar penetration begins.

CO 2 Price-Based Case. In the CO 2 Price-Based case, the nature of the system adjustments in these simulations can be illustrated using an example of the changes that would be brought about by lower-cost wind capacity. First, the increased intermittent renewable generation needs to be accompanied by flexible back-up capacity, albeit with low utilization levels. In the U.S., spare capacity of gas-fueled plants is enough to meet this requirement initially, but eventually additional investment is needed (gas turbines in these scenarios).

As this combination of new intermittent renew

able and flexible electricity plants grows, it starts to replace the expansion and utilization of baseload generation technologies, nuclear or fossil generation with CCS (coal without CCS has already been forced out of the system by its CO 2 emissions). However, these classic baseload technologies are not increasing; therefore, the low-cost renewable capacity plus flexible generation increases in baseload and even in mid-merit service, at the expense of gas generation.92 MIT S T UDY ON T H E FU T UR E O F N A T URAL GA S This interaction can be illustrated with a summary of what happens in the base case system for the ERCOT region when different renewable costs are simulated, therefore changing the intermittent generation pene

tration levels.
The results in Figure 4.10 are plotted to high

light the way cumulative gas generation changes with different assumptions about wind-generation costs and the corresponding wind-generation levels. The figure shows the total generation in TWh by type of generation technology over the simulation period from 2005 to 2050 and assumes the underlying emissions target is imposed by a CO 2 price. It illustrates that the displacement of gas by wind takes place through changed patterns of investment and generation over many years. As Figure 4.10 shows, increased cumulative wind generation, as a consequence of lower wind investment costs, or an aggressive renew

able portfolio standard, has a direct impact on the new investment and associated production by natural gas, equal to almost one TWh of reduced natural gas generation for one TWh of wind output. This happens because NGCC is the technology that is most vulnerable to wind competition, both before and after coal has been driven out of the market. It should also be noted that, while the cumulative generation of gas turbines (Gas-CT in Figure 4.10) does not change enough to show in the graph, gas turbine capacity actually increases substantially to support the additional wind contribution.

Source: MIT Analysis Figure 4.10 Cumulative Generation in ERCOT in the Period 2005–2050 for All Technologies Given Alternative Levels of Wind Penetration (TWh)
5,000
4,500
4,000
3,500
3,000
2,500
2,000
1,500
1,000

500

0 250 450 650 850 1,050 1,250 1,450 1,650 Wind (Gen) Nuclear (Gen)
Coal Old Scrubbed
Coal Old Unscrubbed
Oil-Gas Steam
Gas-CC
Gas-CT Hydro Utility PVTWhChapter 4: Electricity 93 In Figure 4.10, the horizontal axis is cumulative wind output, the vertical axis is the cumulative output for all technologies, including wind (if the two axes were plotted to the same scale the function for wind would be a 45 ̊ line). The base-case level of wind generation is indicated with a vertical line, so that output to the right of that point results from lower capital costs and the output to the left results from higher capital costs.
Figure 4.10 also shows that the difference in cumulative generation by the other technolo

gies is not much affected by changes in the contribution of wind generation. It should be repeated that this is a result for ERCOT. The differences in generation mix in other regions will vary, though viewed at the national level the pattern is very similar to that shown here. 19

CO 2 Cap Case. The result differs somewhat if emissions mitigation is accomplished by a CO 2 cap instead of a price. The fixed CO 2 constraint implies that an increment in wind output that displaces NGCC production and investment also reduces the need for other low-CO 2 baseload capacity to reduce the emissions.
Cheaper wind creates slack under the emissions constraint, which may be filled by whatever is the cheapest generation source. In some simu lations, this cheap generation comes from otherwise almost-idle coal-fired plants. Thus, as a minor perverse effect, under the CO 2 constraint more wind can imply a small increment of additional coal production — a condition that does not occur when coal is burdened by a CO 2 price.
The case of solar generation without storage is similar to wind in many respects. However, since the production profile of solar has a high level of coincidence with the daily demand and has a more stable pattern, an increment in solar generation does not require back-up from flexible gas plants as much as wind does. In fact, solar can partially fulfill a peaking plant role.
In summary, our analysis of gradual and sustained “long term” penetration of wind and solar shows that large-scale penetration of wind generation, when associated to flexible natural gas plants, will assume a mostly baseload role, and will reduce the need for other competing technologies such as nuclear, coal or even gas-fueled combined cycles, if expansion with coal and nuclear technologies does not take place

because of economic, environmental or any other reasons. This effect is less pronounced in the case of the solar technology, because of its characteristic daily production pattern.
Although our analysis has been limited to a few alternative scenarios, we can observe a consis

tent pattern for the impact of intermittent renewable generation: We see that an increase of wind or solar output systematically results in a proportionally significant reduction of natural gas fueled production, while, at the same time, the total installed capacity of flexible generation (typically also natural gas fueled plants) is maintained or increased.
Precise numerical estimations and any second order impacts are heavily dependent on the specific energy policy instruments and the assumptions on the future costs of fuels and technologies. 

## Our analysis shows that a gradual and sustained “long term” substantial penetration of wind, when associated with flexible natural gas plants, will assume a mostly baseload role, and will reduce the need for other competing technologies such as nuclear, coal or even gas-fueled combined cycles. This effect is less pronounced in the case of solar.94 MIT S T UDY ON T H E FU T UR E O F N A T URAL GA S The detailed operational analysis of plausible future scenarios with large presence of wind and solar generation reveals the increased need for natural gas capacity (notable for its cycling capability and lower capital cost) to provide reserve capacity margins. This does not how

ever necessarily translate into a sizeable utiliza

tion of these gas plants.
Additional Implications
In deregulated wholesale markets with substan

tial penetration of renewables, the volatility of marginal prices can be expected to increase. Also, mid-range technologies, of which NGCC is the most likely candidate, will see their output reduced. The uncertainty regarding the adequate technology mix, and the economics of such a mix under the anticipated future prices and operating conditions, raises concern about attracting sufficient investment in gas-fueled plants under a competitive market regime.
This issue is presently being addressed by several European countries with significant penetration of wind generation, where the patterns of production of NGCC and single cycle gas turbines and also of some baseload technologies, have already had major impacts. Similar situations are developing in some parts of the U.S. Presently there is no consensus on a suitable regulatory response to this situation, which could include enhancements of any capacity mechanisms such as those already in place in most U.S. wholesale markets, new categories of remunerated ancillary services or other instruments. R E C O MMENDATI O N In the event of a significant penetration of intermittent renewable production in the generation technology mix, policy and regulatory measures should be developed to facilitate adequate levels of investment in natural gas generation capacity to ensure system reliability and e ffi ciency.

Although limited in scope, our analysis shows the diversity and complexity of the impacts that a significant penetration of intermittent generation (mostly wind and solar, in practice) have on the technology mix and the operation of any considered power system. The possible future emergence of electricity storage options, as well as enhanced demand responsiveness, will also affect the need for flexible generation capacity, which is presently fueled by natural gas. The level and volatility of future energy prices will determine the volume and nature of investment in future generation under market conditions. Other regulatory frameworks should also be considered.
These complicated implications and trade-offs cannot be spelled out without the help of suitable computer models. The accuracy of the estimates of future fuel utilization and the adequate technology mix critically depends on the performance of these models. Unfor

tunately, the state-of-the-art computer models that simulate and optimize the capacity expan

sion and the operation of power systems and electricity markets — such as ReEDS or Mem

phis — are still in a development phase and fall short of the requirements to incorporate intermittent generation, storage and demand response realistically, under a variety of energy policies and regulatory environments.Chapter 4: Electricity 95 R E C O MMENDATI O N A comprehensive appraisal of the economic, environmental and reliability implications of di ff erent levels of significant penetration of renewable generation should be performed for power systems with di ff erent generation technology portfolios and under di ff erent energy policy scenarios.

The information obtained from this appraisal should inform a central piece in the design of energy policies that contemplate mandating large amounts of solar or wind generation.

Additional e ff orts should be made to expand or develop the sophisticated computation electric system models that are needed for this task.96 MIT S T UDY ON T H E FU T UR E O F N A T URAL GA S N OT ES

1 Nameplate capacity is the nominal, maximum instantaneous output of a power plant.

2 Absent other considerations, generation units are normally dispatched in economic merit order, i.e., those with lower variable operating costs first.

3 Channele Wirmin, EIA, private communication.

4 Steinhurst, W., The Electric Industry at a Glance , Nuclear Regulatory Research Institute, 2009.

5 Electric Power Research Institute, A Primer on Electric Power Flow for Economists and Utility Planners , 1995; Pérez-Arriaga, I., Rudnick H., Rivier, M., Chapter One: Electric Energy Systems, An Overview

.

6 Hydroelectric generation, shown in Figure 4.2 as constant over demand periods, will in fact tend to be concentrated in particular seasons and peak periods of the day. The MARKAL model does not represent this detail, though its inclusion would have only a small effect on the figure as it aggre

gates all the national hydroelectric facilities.

7 The same change in unit dispatch could be approached using various forms of direct regulation, options not studied here.

8 The ReEDS model captures key characteristics of the electricity network’s transmission constraints and reliability requirements by splitting the country into 134 geographic partitions. Each partition balances demand and supply of electricity by independently generating, importing, and exporting electricity. Collectively, subsets of these balancing areas constitute the independent system operators (ISOs) and regional transmission organizations (RTOs).

9 As noted in the introduction of this section, the expected maximum capacity factor for an NGCC plant is 85%. The EIA projects that this could increase to 87% by 2016 (http://www.eia.doe.gov/ oiaf/aeo/pdf/2016levelized_costs_aeo2010.pdf). The average fleet capacity factor of 87% from ReEDS for the 20% CO 2 reduction scenario approaches the upper generation threshold of the country’s current NGCC fleet. 10 Although the trend for NGCC displacement of coal generation remains the same for this updated scenario, these results are numerically different than the results presented in the interim report. The interim report showed opportunities for coal displacement in all time periods. The difference stems from assumptions about how much NGCC capacity exists in ERCOT. The NGCC capacity numbers used for this 2012 simulation are more conservative, and projected forward from 2006 EIA capacity and generation data (2006 is the start year for ReEDS).

11 Presentation, “ Reducing Pollution from Power

Plants,” Gina McCarthy, Assistant Administrator, U.S. EPA Office of Air and Radiation, October 29, 2010.

12 For a variety of reasons, deployment of required

controls has been delayed, largely by court findings of legal flaws in various rulemakings. The New Transport Rule, which will replace Clean Air Interstate Rule (CAIR) in place today, is expected to be finalized in mid-2011 and will be imple

mented over time, with most coverage finalized by 2014. The Transport Rule will cover SO 2 and NOx. EPA released a proposed rule for mercury emissions from coal and oil-fired power plants in March, 2011 and plans to finalize the rule by the end of the year. A final rule on CO 2 for power plants is expected sometime in 2012.

13 This break-even price assumes a NGCC

variable O&M cost of $3.20/MWh, fuel price of $5.38/mmBtu, heat rate of 6.04 mmBtu/MWh, and CO 2 emissions of 0.053 tons/mmBtu. For coal, the calculation assumes a variable O&M cost of $4.30/MWh, fuel price of $2.09/mmBtu, heat rate of 10 mmBtu/MWh, and CO 2 emissions of 0.098 tons/mmBtu. The cost of NGCC and coal generation break-even when the sum of the variable O&M cost and price per ton CO 2 multiplied by the amount of CO 2 emitted are equal to each other, for the respective fuels. Start-up and shut-down costs, ramp rates, associated changes in emissions, and other costs that have not been fully modeled are not included in this calculation.

14 MIT Energy Initiative’s report on Retrofitting

of Coal-Fired Power Plants for CO 2 Emissions Reductions , Cambridge, MA, 2009 (http://web.mit. edu/mitei/docs/reports/meeting-report.pdf).

15 EIA AEO 2010.Chapter 4: Electricity 97 16 See Bentek study, How Less Became More: Wind,

Power and Unintended Consequences In the Colorado Energy Market, April 2010.

17 See “Impact of intermittent renewable electricity

generation on the technology mix and fuel consumption in the U.S. power system.” Yuan Yao, Ignacio J. Pérez-Arriaga. CEEPR (Center for Energy and Environmental Policy Research), MIT, May 2011.

18 The ReEDS simulations of this level of mitigation

show a greater penetration of renewable genera

tion than do the results of the EPPA model shown in Chapter 3, but the difference is not an impor

tant influence on the insights to be drawn from these calculations.

19 Details of these cases are provided by Yao and

Pérez-Arriaga, op cit.Chapter 5: Demand 99 

# Chapter 5: Demand

INTRODUCT I ON
Natural gas is attractive for a variety of end-use applications because it is:

s CLEAN BURNING

s SUBSTANTIALLY LESS CARBON INTENSIVE THAN COAL

AND OIL

s EFlCIENT WITH AN AVERAGE ENERGY EFlCIENCY OF

 DELIVERED TO THE BURNER TIP

s mEXIBLE WITH USE AT SMALL AND LARGE SCALES AND

RESPONSIVE TO DEMAND CHANGES AND

s VERSATILE !S SHOWN IN &IGURE  DOMESTIC NATURAL GAS SUPPLY IS CURRENTLY DIVIDED ALMOST EVENLY AMONG THE RESIDENTIALCOMMERCIAL INDUSTRIAL AND ELECTRIC POWER GENERATION MARKETS AND HAS A SUBSTANTIAL MARKET SHARE IN EACH 4HIS PATTERN HAS CHANGED OVER TIME PRINCIPALLY BECAUSE OF THE SUBSTANTIAL INCREASE IN NATURAL GAS USE FOR ELECTRICITY GENERATION OVER THE LAST  YEARS AS SEEN IN &IGURE  A TREND THAT IS LIKELY TO CONTINUE /N THE OTHER HAND NATURAL GAS PLAYS A MINIMAL ROLE IN THE 53 VEHICULAR TRANSPORTATION SECTOR COMPRISING ONLY AROUND  OF THE ENERGY USE .ATURAL GAS USE FOR TRANSPORTATION IS MAINLY TO POWER GAS TRANSPORT IN PIPELINES

Figure 5.1 Natural Gas End-Use Markets (2009)

Coal

Petroleum

Electricity Natural Gas

Renewable Residential/Commercial

Industrial Transportation

Total Natural Gas

Supply (22.8 TCF)

Electric Power

Generation 2.9%

32.4%

30.2% 34.5%

93.9% 46.5% 8.9%

40.8%

2.6% 3.4%

0.1% 0.3%

35.7% 34.9%

9.3% 6.3% 13.8% 3.5%

3OURCE %)!100 MIT S T U D Y ON T HE FU T URE O F N A T URAL GA S Figure 5.2 Historical Trends in End-Use Consumption

3OURCE %)! Annual Energy Review 2009 0 2 4 6 8 10 12

Residential/Commercial
Industrial Transportation
Electric PowerConsumption (Tcf)19701975198019851990199520002005

C HAPTER OVERV I EW

7E HAVE ANALYZED A SET OF KEY ISSUES IN EACH OF THESE SECTORS WITH A VIEW TOWARD POSSIBLE SIGNIlCANT INCREASES OR DECREASES IN NATURAL GAS USE OPPORTUNITIES FOR EMISSIONS REDUCTIONS AND REDUCTION OF OIL DEPENDENCE IN THE TRANSPORTATION SECTOR

s )N THE INDUSTRIAL SECTOR OVER  OF THE TOTAL

ANNUAL SUPPLY OF  4RILLION CUBIC FEET 4CF OF NATURAL GAS lRES BOILERS AND PROVIDES PROCESS HEAT SO WE FOCUS OUR ANALYSIS ON EFlCIENCY IN THESE USES AND ON THE EMISSIONS REDUCTION OPPORTUNITIES FROM COAL DISPLACEMENT .ATURAL GAS AND .ATURAL 'AS ,IQUIDS .',S ALSO PLAY AN IMPORTANT ROLE AS CHEMICAL FEEDSTOCK AN ISSUE OF IMPORTANCE TO DOMESTIC RETENTION OF MANUFACTURING ACTIVITY s )N THE RESIDENTIALCOMMERCIAL SECTOR ELECTRIC

ITY AND NATURAL GAS COMPETE AS THE TWO MAJOR

SOURCES OF ENERGY SUPPLY )N THE 53 ABOUT  OF ELECTRICITY AN ENERGY CARRIER AND  OF GAS A THERMAL ENERGY SOURCE IS USED IN BUILDINGS %FlCIENCY IN DELIVERING energy services to buildings and institutions WILL BE AN IMPORTANT DIFFERENTIATOR AND OUR ANALYSIS FOCUSES ON TWO ISSUES END
TO
END EFlCIENCY OF ELECTRICITY AND GAS AND THE OPPORTUNITIES FOR NATURAL GAS COMBINED HEAT
AND
POWER DELIVERY SYSTEMS

s &OR THE TRANSPORTATION SECTOR OUR ANALYSIS

FOCUSES ON THE POTENTIAL FOR NATURAL GAS TO DISPLACE OIL AND REDUCE GREENHOUSE GAS '(' EMISSIONS BOTH THROUGH DIRECT USE AND INDIRECTLY THROUGH CONVERSION TO LIQUID FUELSChapter 5: Demand 101 N ATURAL GAS IN THE INDUSTR I AL S ECTOR

)NDUSTRIAL DEMAND FOR NATURAL GAS WAS  4CF IN  REPRESENTING  OF TOTAL 53 NATURAL GAS USE /F THIS TOTAL  4CF WAS USED IN OIL AND GAS lELD PRODUCTION AND PROCESSING OPERATIONS  LEAVING A NET TOTAL OF  4CF DELIVERED TO lNAL
CUSTOMERS FOR )NDUSTRIAL END
USE APPLICATIONS .ATURAL GAS ACCOUNTS FOR  OF TOTAL ENERGY USED IN INDUSTRY PETROLEUM PRODUCTS ARE THE PRIMARY SOURCE OF ENERGY AND COAL USE IS ALSO SIGNIlCANT
-ANUFACTURING COMPRISES ABOUT  OF TOTAL 53 INDUSTRIAL NATURAL GAS USE THE REMAINING  COMPRISES NON
MANUFACTURING USES SUCH AS MINING 3IX INDUSTRIES ACCOUNT FOR  OF TOTAL MANUFACTURING DEMAND AS SHOWN IN &IGURE  2

)N THIS SECTION WE lRST PRESENT AN OVERVIEW OF TRENDS IN NATURAL GAS USE AND EFlCIENCY IN MANUFACTURING AND PROJECTIONS OF FUTURE DEMAND DISCUSSING THE INTERACTION AMONG CHANGES IN OUTPUT CHANGES IN FUEL MIX AND CHANGES IN END
USE EFlCIENCY 7E IDENTIFY INDUSTRIAL BOILERS AND PROCESS HEATING AS THE
TWO PRINCIPAL USES OF NATURAL GAS AS A FUEL AND DISCUSS OPPORTUNITIES FOR CHANGES IN DEMAND ASSOCIATED WITH IMPROVED EFlCIENCY AS WELL AS FUEL SWITCHING 7E ALSO DISCUSS POTENTIAL FOR EFlCIENCY GAINS IN PROCESS HEATING AS WELL AS RESEARCH DEVELOPMENT AND DEPLOYMENT 2$$ OPPORTUNITIES

Figure 5.3 Natural Gas Use by U.S. Manufacturing Industry Sector

“All Other” includes: r #FWFSBHF5PCBDDP1SPEVDUT  	 r5FYUJMF.JMMT	 r5FYUJMF1SPEVDU.JMMT	 r"QQBSFM	 r-FBUIFS"MMJFE1SPEVDUT	 r8PPE1SPEVDUT	 r1SJOUJOH3FMBUFE4VQQPSU	 r1MBTUJDT3VCCFS1SPEVDUT	 r'BCSJDBUFE.FUBM1SPEVDUT	 r.BDIJOFSZ	 r$PNQVUFS&MFDUSPOJD1SPEVDUT  	 r &MFDUSJDBM&RVJQNFOU
"QQMJBODFT
  $PNQPOFOUT	 r 5SBOTQPSUBUJPO&RVJQNFOU	
r 'VSOJUVSF3FMBUFE1SPEVDUT  	 r .JTDFMMBOFPVT	 Food 11%

Petroleum & Coal Products

14%

Chemicals 29% Nonmetallic

Mineral Products 8% Primary Metals

11% All Other 19% Paper 8%

3OURCE %)! -%#3102 MIT S T U D Y ON T HE FU T URE O F N A T URAL GA S Figure 5.4 Trends in U.S. Industrial Natural Gas Consumption and Intensity

3OURCE %)! "%!

Natural Gas Consumption and Efficiency Trends

3INCE  INDUSTRIAL NATURAL GAS USE DECLINED BY  OR ABOUT  4CFYEAR THE ONLY END
USE
SECTOR TO DO SO
&IGURE  SHOWS THAT THIS DECLINE HAS BEEN STEADY NOTWITHSTANDING VOLATILITY IN NATURAL GAS PRICES 4HE INTENSITY OF NATURAL GAS USE IE THE quantity of natural gas used per dollar value of SHIPMENTS DECLINED BY MORE THAN TOTAL USE INDICATING THAT THE REDUCTION WAS DUE TO A COMBINATION OF INCREASED EFlCIENCY OF USE AND

A SHIFT TO LESS ENERGY
INTENSIVE ACTIVITIES 7E ESTIMATE THAT NATURAL GAS CONSUMPTION HAS DECLINED AT AN AVERAGE ANNUAL RATE OF  WHILE NATURAL GAS INTENSITY HAS DECLINED AT AN AVERAGE ANNUAL RATE OF  OVER THIS PERIOD

&OR ENERGY
INTENSIVE INDUSTRIES WE ESTIMATE THAT THE COST OF NATURAL GAS AS A PERCENTAGE OF VALUE OF SHIPMENTS CAN RANGE FROM  FOR THE FOOD PRODUCTS INDUSTRY TO AS MUCH AS  IN THE CASE OF NITROGEN
BASED FERTILIZERS )N OTHER INDUSTRY SECTORS THAT ARE LESS ENERGY INTENSIVE

WE ESTIMATE THE COST OF NATURAL GAS IN THE RANGE OF ONLY  TO  OF THE VALUE OF SHIPMENTS .OTWITHSTANDING THE LOW RATIOS OF NATURAL GAS COSTS TO VALUE OF SHIPMENTS IN MANY MANUFAC

TURING INDUSTRIES VOLATILITY IN THE PRICE OF NATURAL GAS COULD HAVE A SIGNIlCANT IMPACT ON THE COMPETITIVE POSITION OF THOSE INDUSTRIES THAT OPERATE IN GLOBAL MARKETS

3EVERAL FACTORS CONTRIBUTE TO THE PRICE ELASTICITY OF GAS IN THIS SECTOR (IGHER NATURAL GAS PRICES PARTICULARLY IN RELATION TO PRICES ABROAD CAN LEAD TO REDUCED MANUFACTURING OUTPUT !LSO rising prices provide incentives for increased ENERGY EFlCIENCY MEASURES AND FUEL SWITCHING &ALLING PRICES HAVE AN OPPOSITE EFFECT ON INDUSTRY OUTPUT AND FUEL SWITCHINGIndustrial Consumption (Tcf) andIndustrial Price ($/MMBtu)Natural Gas Intensity (MMcf/$)

0 1 2 3 4 5 6 7 8 9 10

0.0 0.5 1.0 1.5 2.0 2.5

NG Consumption (Tcf) NG Industrial Price ($/MM) NG Intensity (MMcf/$)

1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009Chapter 5: Demand 103 #OST SAVINGS RESULTING FROM ENERGY EFlCIENCY GAINS ARE INCREASINGLY VIEWED AS A BUSINESS OPPORTUNITY SINCE THE SAVINGS mOW DIRECTLY TO THE BOTTOM LINE .EW ENERGY
EFlCIENT CAPITAL INVESTMENTS CAN OFFER ATTRACTIVE RETURNS ON INVESTMENT COMPETING WITH OTHER CORPORATE CAPITAL INVESTMENT OPPORTUNITIES ! RECENT STUDY CONDUCTED FOR THE 0EW #ENTER ON 'LOBAL #LIMATE #HANGE DOCUMENTED THE NEXUS BETWEEN BUSINESS PROlTABILITY IMPROVED ENERGY EFlCIENCY AND #/ 2 EMISSIONS REDUCTIONS )T SHOWED THAT COMPANIES DO BEST IN REDUCING ENERGY USE WHEN THEY SET AGGRESSIVE ENERGY REDUCTION TARGETS CLOSELY MONITOR PROGRESS HAVE ACTIVE TOP MANAGEMENT INVOLVEMENT AND TAKE A COMPREHENSIVE APPROACH TO ANALYZING ENERGY EFlCIENCY OPPORTUNITIES FROM MANUFAC

TURING TO MARKETING 3

4HESE GENERAL PATTERNS ARE REmECTED IN THE 53 %NERGY )NFORMATION !DMINISTRATION %)! !NNUAL %NERGY /UTLOOK !%/ 	 4HE !%/  PROJECTS NATURAL GAS DEMAND IN THE )NDUS

TRIAL SECTOR TO REBOUND TO PRE
 LEVELS IN

EXCESS OF  4CFYEAR BY   4HE NET INCREASE IS ATTRIBUTED TO CONTINUED RECOVERY FROM THE RECESSION INCREASED COMBINED HEAT AND POWER #(0 AND DEMAND RESPONSE TO LOWER NATURAL GAS PRICES PARTLY OFFSET BY CONTINUED GAINS IN ENERGY EFlCIENCY 4HE !%/  PROJECTS THE AVERAGE ANNUAL GROWTH IN NATURAL GAS DEMAND IN INDUSTRY AT  THROUGH  ABOUT HALF OF THE PROJECTED GROWTH RATE OF  IN THE VALUE OF INDUSTRY SHIPMENTS REmECTING A CONTINUING DECLINE IN NATURAL GAS INTENSITY 

4HE ECONOMIC MODELING ANALYSIS THAT UNDERLIES THE RESULTS PRESENTED IN #HAPTER  SHOWS A SIMILAR PATTERN OF )NDUSTRIAL GAS DEMAND OVER COMING DECADES 5NDER THE ASSUMPTION OF

NO ADDITIONAL POLICY ON '('S 53 )NDUSTRIAL GAS DEMAND GROWS OVER THE PERIOD TO  AND BEYOND /N THE OTHER HAND UNDER THE PRICE
BASED POLICY EXPLORED IN #HAPTER  WHICH REDUCES NATIONAL '(' EMISSIONS TO  OF  LEVELS BY  TOTAL INDUSTRY GAS DEMAND DECLINES OVER THE NEXT TWO DECADES AS GAS USE SHIFTS TOWARDS ELECTRIC GENERATION AND AWAY FROM OTHER END USES )N THE MOST ENERGY INTENSIVE 53 MANUFACTURING INDUSTRIES GAS
USE REMAINS ROUGHLY CONSTANT AT THE  LEVEL SUBSTANTIALLY BELOW THE NO
POLICY PROJECTION (OWEVER BECAUSE OF MODELED mEXIBILITY IN THIS INDUSTRY SEGMENT THE VALUE OF DOMESTIC OUTPUT IS ONLY SLIGHTLY BELOW THAT IN THE NO
POLICY CASE 
Principal Uses of Natural Gas as a Fuel and as a Chemical Feedstock

.ATURAL GAS IS USED IN 53 MANUFACTURING BOTH

AS A FUEL AND AS A CHEMICAL FEEDSTOCK 4HE TWO PRIMARY FUEL USES ARE IN BOILERS AND PROCESS HEATING AND THE TWO PRIMARY FEEDSTOCK USES OF NATURAL GAS ARE IN AMMONIA .( 3 MANUFACTUR

ING AND HYDROGEN ( 2 PRODUCTION &IGURE  SHOWS THAT PROCESS HEATING ACCOUNTS FOR  OF MANUFACTURING NATURAL GAS CONSUMPTION WITH BOILERS CONVENTIONAL AND COMBINED HEAT AND POWER ACCOUNTING FOR AN ADDITIONAL  4HESE
TWO APPLICATIONS TOTAL  4CFYEAR OR OVER THREE
FOURTHS OF TOTAL NATURAL GAS USED IN MANU

FACTURING AND OVER  OF TOTAL INDUSTRIAL USE AND THUS PROVIDE THE FOCUS FOR OUR ANALYSIS

Figure 5.5 U.S. Manufacturing Natural Gas Use by End-Use Application

CHP/Cogen 14% Conventional

Boiler Use 22%

Process Heating 42% HVAC

6% Feedstock 7% Other/Not Reported 7%
Machine Drive

2%

3OURCE %)! -%#3104 MIT S T U D Y ON T HE FU T URE O F N A T URAL GA S Natural Gas Use in Industrial Boilers

)NDUSTRIAL BOILERS BOTH CONVENTIONAL AND #(0 CONSUMED  4CF OF NATURAL GAS IN  ACCOUNTING FOR  OF TOTAL NATURAL GAS IN MANUFACTURING 7 7E EXAMINE TWO POTENTIAL DRIVERS AFFECTING DEMAND FOR NATURAL GAS IN BOILERS MODERNIZATION OF THE CURRENT NATURAL GAS BOILER mEET WITH MORE EFlCIENT UNITS AND REPLACEMENT OF COAL BOILERS WITH NEW NATURAL GAS BOILERS /UR ANALYSIS IS SUMMARIZED IN THE DISCUSSION THAT FOLLOWS A MORE DETAILED DISCUS

SION IS PROVIDED IN !PPENDIX !

)NDUSTRIAL BOILERS ARE USED TO PROVIDE STEAM AND HOT WATER IN ALL MANUFACTURING INDUSTRIES WITH THE FOUR LARGEST APPLICATIONS IN CHEMICALS 	 FOOD PROCESSING 	 PAPER 	 AND PETROLEUM AND COAL PRODUCTS 	 4HERE IS STRONG COMPETITION AMONG BOILER FUELS IN THE ENERGY INTENSIVE INDUSTRIES THAT EMPLOY LARGER BOILERS AND HAVE READY ACCESS TO ALTERNATIVE FUEL SUPPLIES .ATURAL GAS IS THE PREDOMINANT BOILER FUEL IN OTHER MANUFACTURING INDUSTRIES WHICH TYPICALLY EMPLOY SMALLER BOILERS AND DO NOT HAVE THE SAME OPPORTUNITIES FOR USE OF BY
PRODUCTS AND WASTE FUELS

/UR ANALYSIS IS BASED ON A  -ILLION "RITISH THERMAL UNITS --"TU	HOUR BOILER  WHICH IS relatively large for natural gas boilers but COMPARABLE TO MANY COAL BOILERS !S A SENSITIV

ITY ANALYSIS WE ALSO ANALYZED A SMALLER SIZE BOILER  --"TUHOUR
Modernization of the Natural Gas Industrial Boiler Fleet

-OST EXISTING NATURAL GAS BOILERS HAVE BEEN IN SERVICE FOR DECADES AND EXPERIENCE LOW TURNOVER RATES /N AVERAGE THE EXISTING mEET OF PRE
 BOILERS HAS AN AVERAGE ENERGY EFlCIENCY IN THE RANGE OF  TO  9 4HESE BOILERS REJECT
WASTE HEAT IN THE EXHAUST GASES THIS HEAT IS COMPRISED OF THE LATENT HEAT THAT CAN BE RECOV

ERED FROM CONDENSING THE WATER VAPOR INTO A LIQUID AS WELL AS THE SENSIBLE HEAT CONTAINED IN THE EXHAUST

)N  THE $EPARTMENT OF %NERGY $/% SET MINIMUM ENERGY EFlCIENCY STANDARDS FOR NEW NATURAL GAS BOILERS IN THE RANGE OF  TO  DEPENDING UPON BOILER SIZE AND BOILER TECHNOL

OGY  .EW BOILERS MEET THIS STANDARD THROUGH THE USE OF ADDITIONAL HEAT RECOVERY SYSTEMS IE CONDENSING TECHNOLOGY TO CAPTURE THE LATENT HEAT AND A PORTION OF THE SENSIBLE HEAT IN THE EXHAUST GASES )N ADDITION USE OF ECONOMIZERS ALLOWS FOR WASTE HEAT TO BE RECOVERED BY PRE HEATING THE BOILER FEED WATER 4HESE IMPROVE

MENTS CAN BOOST OVERALL ENERGY EFlCIENCY TO THE  TO  LEVEL &URTHER TECHNOLOGY ADVANCES ENTERING THE MARKETPLACE INCLUDE MULTI
STAGE COMBUSTION SYSTEMS

 WHICH ALSO REDUCE ./X A MIXTURE OF NITRIC OXIDE AND NITROGEN DIOXIDE EMISSIONS

 AND ADVANCED CONDENSERS AND AIR PRE
HEATING SYSTEMS 4HESE hSUPERv EFlCIENT BOILERS CAN ACHIEVE EFlCIENCIES IN THE RANGE OF  TO 

7E COMPARED THE NET PRESENT VALUE .06 OF THE PRE
TAX COST OF REPLACING AN EXISTING  --"TUHOUR NATURAL GAS BOILER WITH EITHER

A HIGH
EFlCIENCY OR SUPER
HIGH
EFlCIENCY UNIT 7E ESTIMATE THAT REPLACEMENT OF CURRENT NATURAL GAS BOILERS WITH HIGH
EFlCIENCY MODELS WOULD
AT A  DISCOUNT RATE YIELD A REDUCTION OF  IN ANNUALIZED COSTS ON A PRE
TAX BASIS 2EPLACE

MENT WITH SUPER
HIGH
EFlCIENCY BOILERS WOULD YIELD ANNUALIZED SAVINGS OF  ! SENSITIVITY ANALYSIS ON SMALLER SIZE NATURAL GAS BOILERS IE  --"TUHOUR YIELDS SIMILAR RESULTS

4HE PAYBACK PERIODS FOR THESE BOILER REPLACE

MENTS RANGE FROM  TO  YEARS BASED ON  ACTUAL INDUSTRIAL NATURAL GAS PRICES AND ASSUMING NO INCREASE IN NATURAL GAS PRICES OVER THIS PERIOD (IGHER NATURAL GAS PRICES WOULD IMPROVE THE RESULTS LOWER NATURAL GAS PRICES WOULD REDUCE THE PROJECTED ANNUALIZED SAVINGS AND EXTEND THE PAYBACK PERIODChapter 5: Demand 105 4HE COST ESTIMATES ARE FOR EQUIPMENT ONLY INSTALLATION COSTS WILL REDUCE THESE RETURNS SOMEWHAT !LSO IN PARTICULAR INSTANCES THE ATTRACTIVENESS OF BOILER MODERNIZATION WILL DEPEND ON OTHER FACTORS SUCH AS THE REMAINING BOOK VALUE OF EXISTING BOILERS THAT A lRM MIGHT WRITE OFF THE AVAILABILITY OF INVESTMENT CAPITAL THE RETURN ON INVESTMENT IN BOILER MODERNIZA

TION RELATIVE TO OTHER OPPORTUNITIES AND THE AVAILABILITY OF TAX INCENTIVES SUCH AS ACCELERATED DEPRECIATION OR INVESTMENT TAX CREDITS #ONSID

ERING ALL THESE FACTORS HOWEVER IT APPEARS THAT REPLACEMENT WILL BE COST EFFECTIVE IN MANY INSTALLATIONS

4WO SCENARIOS CAN PROVIDE AN INDICATION OF THE IMPACT ON NATURAL GAS CONSUMPTION  A REPLACEMENT OF  OF CURRENT NATURAL GAS INDUSTRIAL BOILER CAPACITY WITH HIGH
EFlCIENCY NATURAL GAS BOILERS WOULD REDUCE DEMAND FOR NATURAL GAS BY  "ILLION CUBIC FEET "CF ANNUALLY WHILE  A REPLACEMENT OF  OF
CURRENT NATURAL GAS BOILER CAPACITY WITH SUPER HIGH
EFlCIENCY NATURAL GAS BOILERS WOULD REDUCE DEMAND BY  "CF ANNUALLY 4HE REDUCTION IN CARBON DIOXIDE #/ 2 EMISSIONS RANGES FROM ABOUT  TO OVER  TONS PER YEAR PER BOILER

F I N D I N G Replacement of existing industrial natural gas boilers with higher e ffi ciency models could cost-e ff ectively reduce natural gas demand and reduce G H G emissions.

RECOMMENDATION T he DOE should review the current energy

e ffi ciency standards for commercial and industrial natural gas boilers and assess the feasibility of setting a more stringent standard. Replacement of Existing Coal Industrial Boilers with Efficient Natural Gas Boilers

! #/ 2 EMISSIONS REDUCTION REQUIREMENT COULD LEAD TO A SIGNIlCANT LEVEL OF REPLACEMENT OF EXISTING COAL BOILERS BY NATURAL GAS !BSENT A CARBON CONSTRAINT A POTENTIAL DRIVER FOR FUEL SWITCHING OF COAL BOILERS TO NATURAL GAS IS THE ESTABLISHMENT OF .ATIONAL %MISSIONS 3TANDARDS FOR (AZARDOUS !IR 0OLLUTANTS .%3(!03 BASED ON THE APPLICATION OF MAXIMUM ACHIEV

ABLE CONTROL TECHNOLOGY -!#4	

/UR ANALYSIS IS BASED ON THE &EBRUARY   %0! -!#4 EMISSIONS STANDARDS FOR MERCURY (G METALS DIOXIN ACID GASES AND OTHER HAZARDOUS AIR POLLUTANTS EMITTED FROM INDUSTRIAL BOILERS AND PROCESS HEATERS /N -AY   %0! ADMINISTRATOR *ACKSON ISSUED A STAY OF THE

NEW STANDARDS TO ALLOW FOR ADDITIONAL REVIEW AND COMMENT

.ATURAL GAS BOILERS BECAUSE OF THE CLEAN BURNING NATURE OF THE FUEL ARE NOT SUBJECT TO

NEW EMISSIONS REDUCTION REQUIREMENTS /N THE OTHER HAND THREE SUBCATEGORIES OF COAL BOILERS UTILIZING DIFFERENT TECHNOLOGIES

 STOKER mUIDIZED BED AND PULVERIZED COAL COMBUSTION

 ARE SUBJECT TO NEW STANDARDS FOR THE CONTROL OF PARTICULATE MATTER ACID GASES TOXIC CHEMICALS AND (G !CHIEVING THESE EMISSION STANDARDS WILL REQUIRE THE INSTALLATION OF WET SCRUBBERS AND FABRIC lLTERS )NSTALLATION OF ACTIVATED CARBON INJECTION FOR CONTROL OF (G EMISSIONS ALSO MAY BE REQUIRED IN SOME INSTANCES

4HE %0! ECONOMIC ANALYSIS SUPPORTING THE

NEW -!#4 STANDARDS ASSUMED THAT EXISTING COAL BOILERS WOULD RETROlT POST
COMBUSTION CONTROLS 4HE %0! CONSIDERED AND REJECTED FUEL SWITCHING AS A CONTROL OPTION PRIMARILY BECAUSE OF ASSUMED HIGH NATURAL GAS PRICES  PER --"TU FOR INDUSTRIAL DELIVERY IN  AND ASSUMED  LOSS OF EFlCIENCY FROM REPLACE

MENT OF BURNERS IN EXISTING BOILERS106 MIT S T U D Y ON T HE FU T URE O F N A T URAL GA S 7E PERFORMED AN ANALYSIS USING CURRENT NATURAL GAS PRICE ASSUMPTIONS COMPARING FOUR POSSIBLE COMPLIANCE OPTIONS FOR COAL BOILERS  RETROlT OF POST
COMBUSTION CONTROLS USING %0! COST ASSUMPTIONS	  RETROlT OF NATURAL GAS BURNERS WITHIN THE EXISTING COAL BOILER WITH %0! EFlCIENCY ASSUMPTIONS	  REPLACEMENT OF THE EXISTING COAL
lRED BOILER WITH A HIGH EFlCIENCY NATURAL GAS BOILER AND  REPLACE

MENT OF THE EXISTING COAL BOILER WITH ONE OF THE

NEW SUPER
HIGH
EFlCIENCY NATURAL GAS BOILER TECHNOLOGIES

/UR ANALYSIS INDICATES THAT REPLACEMENT OF COAL BOILERS WITH EFlCIENT OR SUPER
EFlCIENT NATURAL GAS BOILERS IS COST COMPETITIVE WITH RETROlTTING POST
COMBUSTION CONTROLS 4HE .06 COST AT A  DISCOUNT RATE OF HIGH
EFlCIENCY NATURAL GAS BOILERS IS SLIGHTLY HIGHER THAN THE .06 COST OF POST
COMBUSTION CONTROLS WHILE THE .06 OF SUPER
EFlCIENT BOILERS IS SLIGHTLY LOWER THAN THE
COST OF RETROlTTING 4HE HIGHER ENERGY EFlCIENCY PERFORMANCE LEVELS OF NEW NATURAL GAS BOILERS
AT CURRENT GAS PRICES MAKE BOILER REPLACEMENT

AN ATTRACTIVE OPTION .EITHER FACTOR WAS CONSID

ERED IN THE %0! ANALYSIS

4HE RESULTS OF THIS ANALYSIS ARE SENSITIVE TO TWO ASSUMPTIONS  THE ESTIMATES OF CAPITAL EQUIPMENT COST FOR RETROlTTING POST
COMBUSTION CONTROLS FOR COAL AND  THE RELATIVE PRICES OF COAL AND NATURAL GAS /UR ANALYSIS USES THE %0! CAPITAL COST ASSUMPTIONS FOR INSTALLATION OF POST
COMBUSTION CONTROLS IE WET SCRUBBERS AND FABRIC lLTERS AT EXISTING COAL BOILERS	 &OR COAL BOILERS THAT MAY REQUIRE ADDITIONAL CON

TROLS TO ACHIEVE -!#4 LIMITS FOR (G EMISSIONS
COSTS WOULD INCREASE SUBSTANTIALLY MAKING THE OPTIONS FOR REPLACEMENT WITH NATURAL GAS BOILERS MUCH MORE COST EFFECTIVE 4HE COMPARATIVE RESULTS ALSO ARE SENSITIVE TO THE PRICE DIFFERENTIAL BETWEEN NATURAL GAS AND COAL "ASED ON ACTUAL AVERAGE DELIVERED PRICES IN  THE PRICE OF NATURAL GAS WAS ON AVERAGE HIGHER THAN COAL BY --"TU ! LOWER PRICE DIFFERENTIAL IE A SMALLER PRICE SPREAD BETWEEN NATURAL GAS AND COAL WOULD MAKE CONVERSION TO NATURAL GAS
MORE ATTRACTIVE A LARGER PRICE DIFFERENTIAL WOULD MAKE CONTINUED USE OF COAL MORE ATTRACTIVE

4HE POTENTIAL IMPACT OF REPLACING INDUSTRIAL COAL BOILERS WITH NEW HIGH
EFlCIENCY NATURAL GAS BOILERS IS SIGNIlCANT 4HE %)! -ANUFACTURING %NERGY #ONSUMPTION 3URVEY -%#3 DATA SHOW THAT INDUSTRIAL COAL BOILERS AND PROCESS HEATERS CURRENTLY USE  TRILLION "TU OF COAL EACH YEAR #ONVERSION OF THIS CAPACITY TO NATURAL GAS WOULD INCREASE DEMAND FOR NATURAL GAS BY  4CFYEAR 4HE ACTUAL RATE OF MARKET PENETRATION WOULD DEPEND UPON INDIVIDUAL FACILITY ANALYSES
2EPLACEMENT OF EXISTING COAL BOILERS WITH NEW EFlCIENT NATURAL GAS BOILERS IN ORDER TO MEET -!#4 REQUIREMENTS COULD REDUCE ANNUAL #/ 2 EMISSIONS BY  TO  TONS PER YEAR PER BOILER 7E ESTIMATE THAT EVEN IF THE .06 COST OF BOILER REPLACEMENT WITH NATURAL GAS IS SLIGHTLY MORE EXPENSIVE THAN RETROlTTING POST
COMBUSTION CONTROLS ASSIGNING THIS INCREMENTAL COST TO THE #/ 2 REDUCTIONS WOULD YIELD AN INCREMENTAL COST FOR #/ 2 reduction OF ABOUT TON

FINDING Replacement of existing industrial coal boilers and process heaters with new,

e ffi cient natural gas boilers could be a
cost-e ff ective alternative for compliance with the E P A MACT Standards. Fuel switching has the potential to increase demand for natural gas while achieving substantial CO 2 emissions reductions at a modest incremental cost.Chapter 5: Demand 107 Natural Gas Use in Manufacturing Process Heating

4HE USE OF SOME FORM OF PROCESS HEATING IS UBIQUITOUS ACROSS VIRTUALLY ALL MANUFACTURING SECTORS ACCOUNTING FOR  4CF OF NATURAL GAS CONSUMPTION IN  OR  OF ALL MANUFAC

TURING GAS USE AND NEARLY ONE
THIRD OF TOTAL INDUSTRIAL USE	 4HREE MANUFACTURING INDUS TRIES

 COAL PRODUCTS  PRIMARY METALS  AND CHEMICALS 

 COMPRISE OVER HALF OF PROCESS HEATING DEMAND FOR NATURAL GAS

0ROCESS HEATING INVOLVES THE TRANSFER OF HEAT ENERGY TO MATERIALS IN A MANUFACTURING PROCESS THROUGH CONDUCTION CONVECTION OR RADIATION INVOLVING DIRECT OR INDIRECT CONTACT WITH STEAM

OR ANOTHER HOT mUID 0ROCESS HEATING IS AN INTEGRAL STEP IN THE MANUFACTURING OF A VARIETY OF PRODUCTS INCLUDING METALS RUBBER PLASTIC CONCRETE GLASS AND CERAMICS 0ROCESS HEATING CONDITIONS CAN VARY WIDELY BY TEMPERATURE EG SEVERAL HUNDRED TO SEVERAL THOUSAND DEGREES &AHRENHEIT BY THROUGHPUT RATES EG SHORT OR LONG CONTACT PERIODS AND BY TYPE OF PROCESS EG BATCH OR CONTINUOUS	 .ATURAL GAS AND ELECTRICITY ARE THE TWO PRIMARY SOURCES OF ENERGY FOR PROCESS HEAT

4HE $/%
SPONSORED COLLABORATIONS INVOLVING .ATIONAL ,ABORATORIES AND INDUSTRY HAVE IDENTIlED FOUR BEST MANAGEMENT APPROACHES TO IMPROVING ENERGY EFlCIENCY IN PROCESS HEATING  IMPROVE THE EFlCIENCY OF THE COMBUSTION PROCESS  REDUCE HEAT LOSSES IN THE PROCESS OF TRANSPORTING AND TRANSFERRING PROCESS HEAT  IMPROVE THE OVERALL RATE OF HEAT TRANSFER FROM THE PROCESS HEAT MEDIUM TO THE PRODUCT AND  RECOVER A PORTION OF THE RESIDUAL WASTE HEAT  4HE $/% REPORTS THAT APPLICATION OF MANY OF THE IDENTIlED BEST MANAGEMENT PRACTICES CAN IMPROVE EFlCIENCY OF PROCESS HEATING TYPICALLY IN A RANGE OF UP TO  WITH

SOME MEASURES SUCH AS PREHEATING COMBUSTION AIR INCREASING EFlCIENCY BY  OR MORE 4HESE

MEASURES TYPICALLY RESULT IN PAYBACKS WITHIN A 
MONTH PERIOD )MPLEMENTATION OF PROCESS HEATING EFlCIENCY IMPROVEMENTS HAVE TO BE CAREFULLY INTEGRATED WITH PROCESS OPERATING PARAMETERS SO AS NOT TO IMPAIR PERFORMANCE FOR EXAMPLE HEAT RECOVERY AND INTEGRATION CAN MAKE PROCESS CONTROL MORE DIFlCULT 7ELL
DESIGNED PROCESS HEATING IMPROVEMENTS CAN ACTUALLY ENHANCE PROCESS PERFORMANCE AND REDUCE ENVIRONMENTAL EMISSIONS 4HE 0EW #ENTER REPORT  on industry

CASE STUDIES HIGHLIGHTED SEVERAL SUCH EXAMPLES  INSTALLATION OF OVEN DRAFT CONTROLS AT &RITO ,AY TORTILLA CHIP OPERATIONS NOT ONLY SAVED NATURAL GAS BUT ALSO IMPROVED THE QUALITY OF THE CHIPS  WASTE HEAT RECOVERY FROM THE INCINERATION OF EXHAUST GASES FROM PAINTING OPERATIONS AT A 4OYOTA MANUFACTURING FACILITY ALSO ENABLED THE PLANT TO REPLACE CENTRALIZED
STEAM GENERATION WITH A DISTRIBUTED HOT WATER SUPPLY SYSTEM AND  REPLACEMENT OF EXISTING ETHYLENE FURNACES AT THE $OW #HEMICAL &REE

PORT 48 FACILITY FOR COMPLIANCE WITH ./X EMISSIONS REQUIREMENTS ALSO IMPROVED PROCESS HEATING EFlCIENCY BY  AND REDUCED #/ 2 EMISSIONS BY  TONSYEAR 
3IGNIlCANT REDUCTIONS IN DEMAND FOR PROCESS HEATING MAY REQUIRE CHANGES IN THE UNDERLYING MANUFACTURING PROCESSES THEMSELVES 4HESE COULD INCLUDE THE SUBSTITUTION OF MEMBRANE SEPARATION FOR TEMPERATURE
BASED SEPARATIONS

MORE SELECTIVE CATALYSTS THAT REDUCE REACTION TEMPERATURES AND GREATER PROCESS INTEGRATION  4HE STEEL INDUSTRY ACHIEVED SIGNIlCANT REDUC

TIONS IN PROCESS HEATING REQUIREMENTS AS A RESULT OF DEPLOYMENT OF CONTINUOUS CASTING MACHINES AND ADVANCES IN NEAR
NET
SHAPE CASTING THAT MINIMIZE THE NEED FOR FOLLOW
UP FORMING OPERATIONS )N THE CHEMICALS INDUSTRY $OW AND "!3& DEPLOYED THE WORLDS lRST COMMERCIAL SCALE PLANT TO CONVERT HYDROGEN PEROXIDE TO PROPYLENE OXIDE REDUCING ENERGY USE BY  AND WASTEWATER PRODUCTION BY   2ESEARCH IS UNDERWAY TO DEVELOP NEW CATALYSTS THAT WOULD ACHIEVE THE OXIDATIVE COUPLING OF METH

ANE TO CONVERT METHANE TO ETHYLENE REPLACING THE ENERGY INTENSIVE CRACKING PROCESS  /THER POSSIBLE NEW APPROACHES IN THE CHEMICALS108 MIT S T U D Y ON T HE FU T URE O F N A T URAL GA S INDUSTRY INVOLVE THE UTILIZATION OF BIOMASS FEEDSTOCK MATERIALS TO REPLACE CONVENTIONAL HYDROCARBON FEEDSTOCK BIO
PROCESSING TECH

NOLOGIES THAT MAY REQUIRE LESS PROCESS HEATING

OR BOTH
&INALLY PRODUCT SUBSTITUTION OFFERS OPPORTUNI

TIES FOR REDUCTIONS IN DEMAND FOR NATURAL GAS 3UCH EXAMPLES INCLUDE NEW CEMENTS NANO MATERIALS AND BIOMIMETIC MATERIALS THAT REQUIRE LESS ENERGY TO PRODUCE THAN CURRENT MATERIALS

FINDING T he potential for significant reductions in the use of natural gas for process heating lies in a shift to new manufacturing process technologies that use less energy-intensive processes and materials.

RD&D Opportunities in Energy-Efficient Technologies
Additional opportunities for advances in INDUSTRIAL TECHNOLOGIES LIE IN THE NEXUS OF ENERGY EFlCIENCY ENVIRONMENTAL QUALITY AND ECONOMIC COMPETITIVENESS !DVANCES IN ENERGY
EFlCIENT PROCESS TECHNOLOGIES ARE WELL INCENTIVIZED BY NORMAL INDUSTRY ECONOMICS DUE TO THE POTENTIAL
TO ALSO IMPROVE PROlTABILITY THROUGH EITHER PRODUCT IMPROVEMENTS OR COST REDUCTION "ECAUSE THESE ADVANCES ALSO PROVIDE IMPORTANT CONTRIBUTIONS TO 53 ENERGY SECURITY AND ENVIRONMENTAL POLICY GOALS THE $/% HAS HISTORICALLY PLAYED AN IMPORTANT ROLE 5NDER THE FORMER )NDUSTRIES OF THE &UTURE 0ROGRAM THE $/% SERVED AS THE CONVENER OF INDUSTRY WORKING GROUPS THAT DEVELOPED TECHNOLOGY ROADMAPS 4HE $/% THEN FUNDED SELECTED 2$$ PROJECTS CONSISTENT WITH THE ROADMAPS &OR EXAMPLE THE DEVELOPMENT OF THE h3UPER "OILERv DESCRIBED EARLIER IN THIS CHAPTER WAS THE RESULT OF AN )NDUSTRIAL #OMBUSTION 4ECHNOLOGY 2OADMAP PREPARED BY

A $/%
FORMED INDUSTRY WORKING GROUP IN  4HE $/% SUBSEQUENTLY COST SHARED AN 2$ EFFORT WITH THE 'AS 4ECHNOLOGY )NSTITUTE '4) A NOT
FOR
PROlT 2$ ORGANIZATION 4HE PARTNERSHIP

WAS SUBSEQUENTLY EXPANDED TO INCLUDE OTHER SPONSORING AND PERFORMING ENTITIES INCLUDING #LEAVER
"ROOKS )NC WHICH SERVED AS THE COMMERCIALIZATION PARTNER 

!  EVALUATION OF THE $/% /FlCE OF )NDUSTRIAL 4ECHNOLOGIES /)4 2$ PROGRAM BY THE .ATIONAL !CADEMY OF 3CIENCES CONCLUDED THAT hxTHE /)4 INDUSTRIAL PROGRAMS ARE COST EFFECTIVE AND HAVE PRODUCED SIGNIlCANT ENERGY ENVIRONMENTAL AND PRODUCTIVITY BENElTS FOR BOTH THE INDUSTRIAL SECTOR AND THE COUNTRYv  4HE !CADEMY REPORT IDENTIlED FOUR LESSONS FROM THE /)4 EXPERIENCE  THE VALUE OF /)4

AS A CATALYST FOR CONVENING INDUSTRY  THE ADVANTAGES OF EARLY AGREEMENT ON GOALS AND METRICS FOR SUCCESS  THE IMPORTANCE OF NON
ENERGY BENElTS TO INDUSTRY AS A DRIVER FOR THE ADOPTION OF TECHNOLOGY AND  THE SIGNIl

CANCE OF DEMONSTRATION AS A MEANS OF PROMOT

ING TECHNOLOGY ADOPTION 4HE #/ 2 EMISSION REDUCTION BENElTS OF $/% /)4 SUPPORTED TECHNOLOGIES AND ACTIVITIES UNDERTAKEN SINCE  HAVE BEEN ESTIMATED AT  MILLION METRIC
TONS OF CARBON EQUIVALENT --4#E	 
%ARLY IN THE LAST DECADE TERMINATION OF THE )NDUSTRIES OF THE &UTURE 0ROGRAM WAS PROPOSED

ON THE ASSUMPTION THAT MARKET FORCES SHOULD DRIVE THE SIZE AND PACE OF FUTURE ENERGY EFl

CIENCY IMPROVEMENTS IN INDUSTRY 4HE 0RESI

DENTS lSCAL  BUDGET PROPOSES TO REPLACE THE )NDUSTRIES OF THE &UTURE 0ROGRAM WITH A SUITE OF

NEW MANUFACTURING 2$ INITIATIVES AND A NEW CRITICAL MATERIALS INNOVATION HUB FOCUSING

MORE ON PRE
COMPETITIVE 2$ TARGETED TO TRANSFORMATIONAL CHANGES IN MANUFACTURING TECHNOLOGIESChapter 5: Demand 109 FINDING I ndustrial energy e ffi ciency R D & D programs supported by the DOE have historicallyled to significant improvements in energye ffi cient technologies: technologies that also achieved significant reductions in CO 2 emissions while improving the economic competitiveness of manufacturing.

RECOMMENDATION T he DOE should continue to play a role in accelerating the development of new technologies that can improve energy

e ffi ciency. T he DOE should again serve as a convener of industry technology working groups to develop roadmaps for future energy-e ffi ciency technology improvements. Based on these roadmaps, the DOE should develop a federally funded R D & D portfolio consisting of applied precompetitive R& D as well as transformational approaches. T he DOE R D & D portfolio should encompass both industry-specific technologies in energy-intensive industries and crosscutting technologies applicable across a broad spectrum of manufacturing industries.

CHP Systems for Industrial Applications

)N MOST CASES INDUSTRIAL BOILER AND PROCESS HEATING INSTALLATIONS TYPICALLY SUPPORT A SINGLE APPLICATION 4HE MODIlCATION OF CURRENT PROCESS HEATING AND INDUSTRIAL BOILERS TO ENABLE #(0 APPLICATIONS COULD HAVE A SIGNIlCANT IMPACT ON NATURAL GAS DEMAND

)NSTALLATION OF #(0 SYSTEMS DOES NOT NECESSARILY INCREASE THE EFlCIENCY OF THE PROCESS HEAT OR STEAM SYSTEM NOR DOES IT GENERATE ELECTRICITY MORE EFlCIENTLY THAN A LARGE
SCALE CENTRAL STATION POWER PLANT 4HE ATTRACTIVENESS OF #(0 STEMS FROM THE INCREASE IN OVERALL SYSTEM EFlCIENCY THAT CAN BE ACHIEVED BY OBTAINING BOTH ELECTRIC POWER GENERATION AND STEAM GENERATION FROM A SINGLE ON
SITE SYSTEM #(0 RESULTS IN INCREASED DEMAND FOR NATURAL GAS AT THE INDUSTRIAL POINT OF

USE SITE WITH SOME OFFSETTING REDUCTION IN DEMAND FOR FUELS AT CENTRAL STATION POWER GENERATION FACILITIES &ROM AN ENERGY SYSTEMS STANDPOINT THE IMPROVEMENT IN OVERALL ENERGY EFlCIENCY HAS TO TAKE INTO ACCOUNT THE REDUCTION IN PURCHASED ELECTRICITY WHICH REDUCES DEMAND FOR ELECTRICITY FROM THE GRID

4HE FEASIBILITY OF #(0 APPLICATIONS IN MANU

FACTURING APPLICATIONS DEPENDS UPON THE ABILITY
TO MATCH THE QUANTITY AND QUALITY OF THE STEAM

OR HOT WATER PRODUCED FROM THE #(0 SYSTEM WITH THE INDUSTRIAL END
USE REQUIREMENTS FOR HEAT AND POWER &OR INDUSTRIAL APPLICATIONS #(0 SYSTEMS ARE DESIGNED TO MEET HEAT LOADS because it is easier to balance electricity genera

TION AND LOAD WITH THE ELECTRICAL GRID )F THE LEVEL OF ELECTRICITY GENERATION IS LESS THAN THE MANUFACTURING LOAD THE FACILITY PURCHASES THE REMAINDER FROM THE GRID IF #(0 ELECTRICITY GENERATION EXCEEDS ELECTRICAL LOAD THE EXCESS IS SOLD BACK INTO THE GRID -ATCHING #(0 SYSTEMS TO HEAT AND POWER LOADS AT SMALLER SCALE SUCH AS INSTITUTIONAL COMMERCIAL AND RESIDENTIAL APPLICATIONS IS MORE CHALLENGING AS DISCUSSED LATER IN THIS CHAPTER

4HE %)! REPORTED  THAT  "CF OF NATURAL GAS
WAS USED FOR INDUSTRIAL #(0 IN  REPRESENT

ING  OF TOTAL INDUSTRIAL NATURAL GAS USE 4HE %)! !%/  PROJECTS AN INCREASE OF  IN ELECTRICITY GENERATED FROM END
USER #(0 SYSTEMS BY   7HILE THIS WOULD IMPLY AN INCREASE IN NATURAL GAS USE OF ABOUT  4CF PER YEAR BY  THIS INCREASE IS ESSENTIALLY OFFSET BY OTHER ENERGY
EFlCIENCY GAINS IN THE )NDUSTRIAL SECTOR SO THAT THE %)! PROJECTION SHOWS RELA

TIVELY mAT DEMAND FOR NATURAL GAS IN THE INDUS

TRY SECTOR FROM THE PERIOD  TO  )N110 MIT S T U D Y ON T HE FU T URE O F N A T URAL GA S ADDITION INCREASED DEMAND IN THE )NDUSTRIAL
SECTOR FOR #(0 ALSO WOULD MITIGATE INCREASES IN DEMAND FOR GRID
SUPPLIED ELECTRICITY

Natural Gas Use as a Chemical Feedstock

!BOUT  OR  4CF OF NATURAL GAS DEMAND IN MANUFACTURING IS FOR USE AS A FEEDSTOCK FOR THE PRODUCTION OF HYDROGEN AND AMMONIA (YDROGEN IS USED EXTENSIVELY IN THE PETROLEUM RElNING INDUSTRY TO UPGRADE PETROLEUM PROD

UCTS AND AMMONIA IS PRIMARILY USED IN THE MANUFACTURE OF FERTILIZER PRODUCTS )N ADDITION .ATURAL 'AS ,IQUIDS .',S WHICH CONSIST PRIMARILY OF ETHANE AND PROPANE ARE KEY FEEDSTOCK MATERIALS FOR MANUFACTURING OF

A VARIETY OF CHEMICAL PRODUCTS

/UR DETAILED ANALYSIS OF CHEMICAL FEEDSTOCK ISSUES IS PRESENTED IN !PPENDIX " 4HE ANALYSIS INDICATES THAT LOWER NATURAL GAS PRICES MAKE THE OPERATION OF CURRENT DOMESTIC AMMONIA MANU

FACTURING CAPACITY MORE COMPETITIVE IN THE GLOBAL MARKET !MMONIA IS THE KEY INTERMEDIATE STEP IN THE MANUFACTURING OF A VARIETY OF NITROG

ENOUS FERTILIZER PRODUCTS 7E ALSO ESTIMATE THAT DUE TO CURRENT PETROLEUMNATURAL GAS PRICE SPREADS .',S WILL HAVE SIGNIlCANT COST ADVAN

TAGE RELATIVE TO NAPHTHA IN THE DOMESTIC MANU

FACTURING OF ETHYLENE %THYLENE IS AN INTERMEDIATE PRODUCT IN THE MANUFACTURING OF POLYETHYLENE POLYVINYL CHLORIDE AND OTHER PLASTICS 7E HAVE
NOT ESTIMATED CHANGES IN 53 NATURAL GAS DEMAND ASSOCIATED WITH POTENTIAL CHANGES IN GLOBAL MARKET COMPETITIVENESS OF THESE COM

MODITIES THIS IS DEPENDENT UPON OTHER FACTORS SUCH AS GLOBAL DEMAND PROJECTIONS AND CAPITAL INVESTMENT PLANS WHICH ARE OUTSIDE THE SCOPE OF

OUR ANALYSIS

4HE DEMAND FOR .',S FOR DOMESTIC ETHYLENE PRODUCTION WILL INCENTIVIZE INCREASED PRODUCTION OF .',S FROM DOMESTIC NATURAL GAS RESOURCES THAT ARE RELATIVELY hWETv IE HIGHER .', CON

TENT	 4HE IMPLICATIONS FOR .', PROCESSING AND INFRASTRUCTURE ARE DISCUSSED FURTHER IN #HAPTER 

ON )NFRASTRUCTURE AND IN !PPENDIX " C OMMERC I AL AND R ES I DENT I AL A PPL I CAT I ONS OF CHP S YSTEMS

3MALLER
SCALE #(0 SYSTEMS ARE AVAILABLE FOR APPLICATIONS IN 2ESIDENTIAL AND #OMMERCIAL SETTINGS 4HERE IS A WIDE VARIETY OF TECHNOLOGY OPTIONS FOR SMALLER
SCALE #(0 SYSTEMS INCLUDING FUEL CELLS GAS TURBINES MICRO
TURBINES AND RECIPROCATING ENGINES SUCH AS THE 3TIRLING ENGINE	 %XCEPT FOR FUEL CELLS THESE TECHNOLOGIES RELY ON THE COMBUSTION OF FOSSIL FUEL TO PRODUCE HEAT LATER CONVERTED INTO MECHANICAL ENERGY TO DRIVE THE GENERATOR THAT PRODUCES ELECTRICITY &UEL CELLS ARE BASED ON ELECTROCHEMICAL CONVER

SION OF THE CHEMICAL ENERGY STORED IN HYDRO CARBON FUELS INTO WATER AND ELECTRIC ENERGY

4HE CHOICE OF #(0 TECHNOLOGY FOR A PARTICULAR APPLICATION WILL DEPEND ON THE DIFFERENT CHAR AC TERISTICS OF THE TECHNOLOGY AND HOW THEY MATCH END
USE REQUIREMENTS 

s .ATURAL GAS MICRO
TURBINES HAVE RELATIVELY

HIGH CAPITAL COSTS BUT HAVE LOWER MAINTENANCE
COSTS THAN OTHER TECHNOLOGIES -ICRO
TURBINES HAVE A HIGH
QUALITY EXHAUST THAT CAN BE USED
TO INCREASE THE PRODUCTION OF HIGH
PRESSURE
STEAM FOR OTHER HIGH
TEMPERATURE APPLICATIONS (OWEVER TURBINES ARE SENSITIVE TO CHANGES IN AMBIENT AIR CONDITIONS AND HAVE A POOR EFlCIENCY AT PART
LOAD CONDITIONS

s 2ECIPROCATING ENGINES HAVE LOW INVESTMENT

COSTS GOOD PART
LOAD PERFORMANCE AND QUICK START
UPS 4HEIR PRINCIPAL DISADVANTAGES INCLUDE HIGH MAINTENANCE COSTS HIGH NOISE LEVELS AND HIGH AIR EMISSIONS AND

s &UEL CELLS HAVE HIGH INITIAL CAPITAL COSTS BUT

ARE VIRTUALLY EMISSIONS FREE AT THE POINT OF END USE QUIET AND EFlCIENT OVER A RANGE OF LOADS

!DDITIONAL DETAILS ON PERFORMANCE CHARACTERIS

TICS AND COST DATA OF #(0 TECHNOLOGIES ARE PROVIDED IN !PPENDIX #Chapter 5: Demand 111 ! CRITICAL PARAMETER IN ASSESSING THE FEASIBILITY OF A #(0 SYSTEM IS THE ABILITY TO MATCH THE HEAT
TO
POWER RATIO (02 OF THE #(0 SYSTEM WITH THE POWER AND HEATING LOADS !S THE SIZE OF THE APPLICATION BECOMES SMALLER MATCHING THE (02 CHARACTERISTICS OF THE #(0 SYSTEM TO LOAD BECOMES A GREATER CHALLENGE SINCE IT WILL DEPEND ON THE #(0 SYSTEMS TECHNICAL CHARAC

TERISTICS AND ITS SUITABILITY TO MEET THE VARIATION IN THE CUSTOMERS HEAT AND POWER
LOAD REQUIRE

MENTS )N 2ESIDENTIAL APPLICATIONS MICRO
#(0S HAVE VERY SMALL ELECTRICAL CAPACITIES LESS THAN  KILOWATT ELECTRIC K7
E WITH DIFFERENT EFlCIENCY AND (02 VALUES DEPENDING ON THE CONVERSION TECHNOLOGY &UEL CELLS OFFER THE HIGHEST ELECTRICAL EFlCIENCY FOLLOWED BY RECIPROCATING ENGINES AND 3TIRLING ENGINES "Y COMPARISON 3TIRLING ENGINES HAVE A RELATIVELY HIGH HEAT OUTPUT PER UNIT OF ELECTRICAL GENERA

TION IE HIGH (02 FOLLOWED BY RECIPROCATING ENGINES AND WITH A RELATIVELY LOW (02 FOR FUEL CELL TECHNOLOGIES 22

4O GAIN FURTHER INSIGHT ON THESE TRADE
OFFS WE PERFORMED AN ANALYSIS OF SEVERAL SCENARIOS FOR APPLICATION OF #(0 SYSTEMS IN SMALLER
SCALE )NSTITUTIONAL AND 2ESIDENTIAL APPLICATIONS 7E CHOSE THE -)4 CAMPUS AS A CASE STUDY FOR #(0 APPLICATION IN AN )NSTITUTIONAL MARKET 4HE -)4 #(0 SYSTEM CONSISTS OF A  MEGAWATT ELECTRIC -7E GAS TURBINE COMBINED WITH A (EAT 2ECOVERY 3TEAM 'ENERATOR (23' TO GENERATE STEAM FROM THE TURBINE EXHAUST GAS 4HE -)4 #(0 SYSTEM PROVIDES ABOUT  TO  OF THE CAMPUS ELECTRICAL LOAD AND THE MAJORITY OF THE CAMPUS STEAM REQUIREMENTS 4HE GAS TURBINE HAS BEEN USED MOSTLY AS BASELOAD POWER WITH THE REMAINDER OF ELECTRICITY PURCHASED FROM THE GRID 4HE REMAINING STEAM LOAD NOT SERVED BY THE #(0 SYSTEM IS MET WITH CONVENTIONAL BOILERS 7E ANALYZED THE COSTS OF THE -)4 #(0 SYSTEM RELATIVE TO A NO
#(0 OPTION IE PURCHASING ALL ELECTRICITY FROM THE GRID AND GENERATING ALL CAMPUS STEAM REQUIREMENTS FROM BOILERS /UR ANALYSIS SHOWED THAT INSTALLATION OF

A #(0 SYSTEM PROVIDED A PRESENT VALUE COST SAVINGS OF ABOUT  AT A DISCOUNT RATE OF  WITH A CORRESPONDING REDUCTION OF ABOUT  IN #/ 2 EMISSIONS 23 /UR lNDINGS ARE DESCRIBED IN MORE DETAIL IN !PPENDIX #

!NOTHER POTENTIAL APPLICATION FOR #(0 IS IN DISTRICT HEATINGCOOLING SYSTEMS $ISTRICT HEATINGCOOLING IS A SYSTEM FOR DISTRIBUTING HEAT IN THE FORM OF STEAM OR HOT WATER OR CHILLED
WATER GENERATED IN A CENTRALIZED LOCATION FOR RESIDENTIAL OR COMMERCIAL SPACE HEATINGCOOLING AND HOT WATER APPLICATIONS $ISTRICT HEATING IS USED EXTENSIVELY IN A NUMBER OF %UROPEAN COUNTRIES FOR INDUSTRIAL COMMERCIAL AND RESIDENTIAL APPLICATIONS &OR EXAMPLE OVER SIX IN TEN HOMES IN $ENMARK ARE SERVED BY DISTRICT HEATING MARKET PENETRATION IS 

OR MORE IN 0OLAND 3WEDEN AND %STONIA AND GEOTHERMAL
BASED DISTRICT HEATING SERVES  OF )CELANDS RESIDENCES 53 EXPERIENCE IS MUCH

MORE LIMITED AND FOCUSED ON INSTITUTIONAL

USERS 7HILE THE 53 CURRENTLY HAS OVER  DISTRICT HEATINGCOOLING SYSTEMS  ABOUT 

SERVE HOSPITALS AND UNIVERSITY CAMPUSES SUCH

AS THE -)4 CAMPUS USED AS A CASE STUDY IN OUR ANALYSIS	 4HE 53 ALSO  URBAN UTILITY DISTRICT HEATING SYSTEMS SERVING ABOUT  BILLION SQUARE FEET OF COMMERCIAL SPACE  -OST 53 DISTRICT HEATING SYSTEMS ARE SINGLE
PURPOSE SYSTEMS BUT THERE IS GROWING INTEREST IN #(0 SYSTEMS FOR THIS PURPOSE 4O STIMULATE THIS MARKET THE $/% COST
SHARED SEVERAL NEW #(0 DISTRICT HEATING PROJECTS USING FUNDS FROM THE !MERICAN 2ECOVERY AND 2EINVESTMENT !CT !22!	 !S THE -)4 CASE STUDY ILLUSTRATES THE MARKET OPPORTUNITIES FOR EXPANDED #(0 DISTRICT HEATING SYSTEMS ARE PROMISING

7E ALSO EXAMINED THE FEASIBILITY OF #(0 SYSTEMS FOR RESIDENTIAL APPLICATIONS IN .EW %NGLAND !S ILLUSTRATED IN &IGURE  THERE IS A CONSIDERABLE MISMATCH BETWEEN ELECTRICITY AND HEATING REQUIREMENTS $URING WINTER THE HEAT LOAD IS SIGNIlCANTLY HIGHER THAN THE POWER LOAD WHILE DURING SUMMER THE POWER LOAD IS SIGNIlCANTLY HIGHER DUE TO DEMAND FOR AIR
CONDITIONING112 MIT S T U D Y ON T HE FU T URE O F N A T URAL GA S Figure 5.6 Hourly Energy Load Profile for One Type of Residential Customer in New England – Sample for one day during Winter and Summer

3OURCE -)4%)Energy load [kWh per hour]Energy load [kWh per hour]

0 5 10 15 20 25

0 5 10 15 20 25

0.0 1.0 2.0 3.0 4.0

0.0 1.0 2.0 3.0 4.0 Winter Summer

1 3 5 7 9 11 13 15 17 19 21 23 Hour 1 3 5 7 9 11 13 15 17 19 21 23 Hour Electric load [kW-e] Heat load [kW-th] Electric load [kW-e] Heat load [kW-th]

/UR ANALYSIS SHOWS THAT THE ENERGY ENVIRON

MENTAL AND ECONOMIC BENElTS OF A #(0 residential application varied greatly depending UPON THE CUSTOMER ENERGY MANAGEMENT STRATEGY $ESIGNING AND OPERATING A 2ESIDENTIAL #(0 SYSTEM TO FOLLOW HEAT LOADS WAS ECONOMI

CALLY COMPETITIVE WITH THE GREATEST BENElT DURING THE WINTER SEASON /PERATING THE #(0 SYSTEM TO FOLLOW ELECTRICITY REQUIREMENTS WAS NOT ECONOMICALLY ATTRACTIVE BECAUSE THE #(0 SYSTEM WOULD PRODUCE LARGE QUANTITIES OF EXCESS HEAT DURING SUMMER MONTHS SIGNIlCANTLY REDUCING OVERALL PERFORMANCE OF THE SYSTEM
&INALLY FOR THE RESIDENTIAL APPLICATIONS A TECHNOLOGY SUCH AS FUEL CELLS WITH A RELATIVELY LOW (02 WAS MORE ATTRACTIVE THAN AN ALTERNA

TIVE ENGINE
BASED TECHNOLOGY WITH HIGHER (02 4HE RELATIVE HIGH ELECTRIC EFlCIENCY OF FUEL CELLS MAKES THIS TECHNOLOGY COMPETITIVE FOR MEETING ELECTRICAL LOADS  4HE DETAILED RESULTS OF THE -)4 AND .EW %NGLAND 2ESIDENTIAL CASE STUDIES

ARE DESCRIBED IN GREATER DETAIL IN !PPENDIX # FINDING M atching heat and power loads for residential and other small-scale applications poses a significant challenge to the feasibility of small-scale C HP systems based on current technologies.

N ATURAL GAS D EMAND I N BU I LD I N G S

4HE RESIDENTIALCOMMERCIAL SECTORS ACCOUNT FOR

OVER  OF TOTAL ENERGY CONSUMPTION IN THE 53 ALMOST EXCLUSIVELY IN BUILDINGS 7HILE THESE TWO SECTORS REPRESENT OVER TWO
lFTHS OF OVERALL ENERGY DEMAND THEY ACCOUNT FOR MORE THAN  OF THE NATIONS NATURAL GAS DEMAND WHEN THE NATURAL GAS USED TO GENERATE ELECTRICITY FOR BUILDINGS IS ADDED TO THE DIRECT USE OF NATURAL GAS IN HOMES AND BUSINESSES 27

7ITHIN THE RESIDENTIALCOMMERCIAL SECTORS THE DIRECT USE OF FUELS SUCH AS NATURAL GAS FUEL OIL AND LIQUID PETROLEUM GAS ,0' ARE CONCENTRATED IN THERMAL END USES ESPECIALLY SPACE HEATING ANDChapter 5: Demand 113 HOT WATER &IGURE  SHOWS THE BREAKDOWN OF ENERGY CONSUMPTION FOR MAJOR END USES IN THE RESIDENTIALCOMMERCIAL SECTORS /F PARTICULAR NOTE

ARE THE DIFFERENCES BETWEEN ELECTRICITY AND DIRECT FUEL CONSUMPTION ACROSS DIFFERENT END USES AND HOW THIS INmUENCES NOT ONLY THE SALES OF ELECTRIC

ITY NATURAL GAS AND OTHER FUELS BUT OVERALL ENERGY CONSUMPTION ONCE ELECTRICITY CONVERSION LOSSES

ARE INCLUDED !S CAN BE SEEN ELECTRICITY AND FUEL SALES

 OFTEN CALLED hSITE ENERGYv

 MASKS OVERALL ENERGY CONSUMPTION SINCE ONLY ABOUT A THIRD OF ENERGY CONSUMED IN POWER GENERATION BECOMES ELECTRICITY SOLD TO THE CONSUMER
Comparing the Efficiency of Space Conditioning and Hot Water Technologies

7HEN CONSIDERING POLICIES TO COST
EFFECTIVELY REDUCE ENERGY CONSUMPTION AND #/ 2 EMISSIONS IN BUILDINGS IT IS IMPORTANT TO CONSIDER BOTH THE END USE AND THE ENERGY CARRIER 4HIS IS ESPECIALLY
TRUE WHEN LOOKING AT APPLIANCES AND BUILDING ENERGY SYSTEMS THAN CAN BE RUN ON EITHER ELECTRICITY OR FUELS SUCH AS NATURAL GAS 5NTIL RECENTLY BUILDINGS COMMONLY HAD SEPARATE SYSTEMS FOR HEATING AND COOLING "OILERS OR FURNACES FOR HEATING CAN RUN ON NATURAL GAS OIL AND ,0' !S SHOWN IN &IGURE  SPACE COOLING WHICH USUALLY INCLUDES HUMIDITY CONTROL EG AIR
CONDITIONING !# IS ALMOST EXCLUSIVELY ELECTRICITY BASED ALTHOUGH LARGE #OMMERCIAL !# SYSTEMS ARE AVAILABLE THAT RUN ON NATURAL GAS AND IN THE PAST GAS
lRED !# SYSTEMS FOR THE RESIDEN

TIAL SECTOR HAVE BEEN COMMERCIALLY AVAILABLE

)N THE LAST SEVERAL DECADES HEAT PUMP SYSTEMS HAVE BECOME MUCH MORE COMMON ! HEAT PUMP IS ESSENTIALLY AN AIR CONDITIONER THAT CAN
RUN BACKWARDS DELIVERING EITHER HOT OR COLD AIR
TO A BUILDINGS INTERIOR -OST HEAT PUMP SYSTEMS ARE AIR
SOURCE HEAT PUMPS USING EXTERNAL AIR AS THE TEMPERATURE RESERVOIR FROM WHICH TO PROVIDE HEATING OR COOLING 4HIS IS SUFlCIENT FOR REGIONS THAT EXPERIENCE MILD WINTERS BUT NOT WHERE TEMPERATURES GET VERY LOW FOR VERY LONG 
Figure 5.7 2006 Breakdown of Building Energy Consumption in the Residential and Commercial Sectors

0 1 2 3 4 5 6

Electricity (Balance of Primary Energy) Electricity (Retail Sales) Renewable Fuels
LPG Oil Natural Gas [% of Sector Energy Consumption using Total Electricity Primary Energy] (% of Sector Energy Consumption using only Electricity Sales (e.g., Site Energy)) [15.8%] (23.4%)

Space Heating Space Cooling Water Heating Lighting Electronics Other Equipment [15.9%] (11.0%) [6.2%] (9.4%) [24.8%] (16.9%) [11.2%] ( 0 7.6%) [26.1%] (31.7%) 0 1 2 3 4 5 6

Electricity (Balance of Primary Energy) Electricity (Retail Sales) Renewable Fuels
LPG Oil Natural Gas [% of Sector Energy Consumption using Total Electricity Primary Energy] (% of Sector Energy Consumption using only Electricity Sales (e.g., Site Energy))

Space Heating Space Cooling Water Heating Lighting Electronics Appliances [13.0%] ( 0 7.9%) [12.4%] (15.5%) [11.6%] ( 0 7.1%) [9.1%] (5.6%)

2006: Total Quads – Commercial Sector 2006: Total Quads – Residential Sector

[27.4%] (19.6%) [26.5%] (44.4%)

3OURCE $/% Buildings Energy Data Book /CT 114 MIT S T U D Y ON T HE FU T URE O F N A T URAL GA S 'ROUND SOURCE OR GEOTHERMAL HEAT PUMPS WHICH USE THE TEMPERATURE OF THE EARTH INSTEAD OF THE AIR TO PROVIDE HEATING AND COOLING

OVERCOME THIS COLD WINTER PROBLEM (OWEVER THIS COMES AT A SIGNIlCANT INCREASE IN INSTALLED
COSTS SINCE AN EXTERNAL HEAT EXCHANGE LOOP NEEDS TO BE INSTALLED IN THE GROUND OUTSIDE THE BUILDING 4HE COST OF THIS HEAT EXCHANGER CAN VARY SIGNIlCANTLY DEPENDING ON THE TYPE OF GROUND SOURCE HEAT PUMP SOIL TYPE AND TEMPERATURE

(OT WATER SYSTEMS ARE MORE STRAIGHTFORWARD SINCE THE SEASONALITY OF USE IS LESS OF A FACTOR #OMMON SYSTEMS USE THE HEAT FROM FUEL COMBUSTION OR ELECTRIC RESISTANCE HEATING TO KEEP A TANK OF WATER AT THE DESIRED TEMPERATURE 2ECENTLY HEAT PUMP HOT WATER SYSTEMS HAVE ENTERED THE MARKET AS HAVE INSTANTANEOUS OR TANKLESS WATER HEATERS

&OR ALL OF THESE SYSTEMS WHETHER FURNACES CENTRAL !# HEAT PUMPS OR HOT WATER HEATERS THE DIFFERENTIAL EQUIPMENT AND LIFE
CYCLE COSTS OF SYSTEMS ARE IMPORTANT FACTORS TO BUILDERS HOMEOWNERS AND POLICY MAKERS AS BUILDERS SEEK TO MINIMIZE INSTALLED COSTS CONSUMERS SEEK TO MINIMIZE OPERATING COSTS AND POLICY MAKERS SEEK TO MINIMIZE SOCIAL COSTS INCLUDING EFFECTS ON THE ENVIRONMENT "ALANCING ALL THESE FACTORS IS CHALLENGING ESPECIALLY WHEN COMPAR

ING SYSTEMS THAT USE DIFFERENT ENERGY CARRIERS IN particular electricity versus natural gas and OTHER hDIRECTv USE FUELS

!S DESCRIBED IN MORE DETAIL IN !PPENDIX $ THERE IS A BROAD RANGE OF EFlCIENCY METRICS FOR FURNACES AIR CONDITIONERS HEAT PUMPS AND HOT
WATER HEATERS THAT OFFER LITTLE GUIDANCE TO CON
SUMERS WHEN TRYING TO COMPARE TECHNOLOGIES

ACROSS FUEL TYPES %VEN HEAT PUMPS WHICH PRO

VIDE BOTH SPACE HEATING AND !# HAVE DIFFERENT EFlCIENCY METRICS DEPENDING ON WHETHER THEY

ARE IN HEATING OR COOLING MODE OR USE OUTSIDE AIR VERSUS THE TEMPERATURE OF THE EARTH AS A HEAT SOURCESINK &OR FURNACES AIR CONDITIONERS AND AIR SOURCE HEAT PUMPS THESE EFlCIENCY METRICS

ARE ALSO hAVERAGEDv ACROSS REFERENCE HEATING OR COOLING SEASONS AND SO DO NOT INFORM INDIVID

UAL CONSUMERS ABOUT HOW THEY MIGHT PERFORM LOCALLY %VEN THIS ROUGH SEASONAL ADJUSTMENT IS NOT POSSIBLE FOR GROUND
SOURCE HEAT PUMPS SINCE BASELINE GROUND TEMPERATURE INFORMATION IS NOT AVAILABLE !ND SO GROUND SOURCE HEAT PUMP MANUFACTURERS REPORT AN OPTIMAL AND SUBSTANTIALLY HIGHER COEFlCIENT OF PERFORMANCE THAN REPORTED FOR AIR
SOURCE HEAT PUMPS

4O ALLOW COMPARISON WE NORMALIZE THESE DIVERSE EFlCIENCY METRICS FOR SELECT 2ESIDENTIAL APPLIANCES AND SPACE CONDITIONING SYSTEMS IN 4ABLE  29 4HIS TABLE FOCUSES ON THE 2ESIDENTIAL SECTOR SINCE IT IS LARGER IN BOTH OVERALL SIZE AND THE NUMBER OF SYSTEMS IN THE lELD AND ALSO BECAUSE IT IS AN AREA WHERE POLICIES INCLUDING APPLIANCE EFlCIENCY AND BUILDING STANDARDS MAY OVERCOME MARKET INERTIA ESPECIALLY AS IT PERTAINS TO EQUIPMENT VERSUS LIFE
CYCLE COST CALCULATIONS FOR SMALLER LESS EXPERIENCED

CONSUMERS

4ABLE  SHOWS THE h3EASONAL #O
EFlCIENT OF 0ERFORMANCEv 3#/0 FOR A RANGE OF 2ESIDENTIAL HEATING COOLING AND HOT WATER SYSTEMS ACROSS A RANGE OF COMMERCIALLY AVAILABLE SYSTEMS INCLUD

ING hLOWv ENERGY EFlCIENCY SYSTEMS HIGHER EFlCIENCY h%NERGY 3TARv SYSTEMS MINIMUM EFlCIENCY TO QUALIFY AS AN %NERGY 3TAR SYSTEM AND A BEST
AVAILABLE ENERGY EFlCIENCY SYSTEM 4HE 3#/0 IS SIMPLY THE RATIO OF THE AMOUNT OF USEFUL ENERGY PROVIDED DIVIDED BY THE AMOUNT OF RETAIL ENERGY FUEL OR ELECTRICITY CONSUMED &OR DIRECT THERMAL SYSTEMS SUCH AS FURNACES THE EFlCIENCY OR 3#/0 WILL BE LESS THAN ONE (OWEVER FOR !# AND HEAT PUMP SYSTEMS WHERE THE ELECTRICITY MOVES HEAT BETWEEN THE INSIDE AND OUTSIDE INSTEAD OF CONSUMING THE ELECTRICITY

AS HEAT THE AMOUNT OF USEFUL ENERGY CAN BE SUBSTANTIALLY GREATER THAN THE hTHERMAL VALUEv OF ELECTRICITY RESULTING IN 3#/0S IN THE RANGE OF TWO AND A HALF TO SEVENChapter 5: Demand 115 Site E nergy E ffi ciency (S CO P*) Sourceto-Site E ffi ciency Full-Fuel- C ycle E ffi ciency (FF C )
Low E nergy Star Best Low E nergy Star Best

Heating System T ype Electric Furnaces 0.95

— 0.99 0.32 0.31

— 0.32 Oil-Fired Furnaces 0.78 0.83 0.95 0.88 0.69 0.73 0.84 Gas-Fired Furnaces 0.78 0.90 0.98 0.92 0.72 0.83 0.90 Air Source Heat Pumps † 2.30 2.40 5.20 0.32 0.74 0.77 1.67 Ground Source Heat Pumps ‡ 2.50 3.30 4.80 0.32 0.80 1.06 1.54 C ooling System T ype Central AC † 3.81 4.25 6.74 0.32 1.22 1.37 2.17 Air Source Heat Pumps † 3.81 4.25 4.98 0.32 1.22 1.37 1.60 Ground Source Heat Pumps ‡ 2.55 4.13 6.57 0.32 0.82 1.33 2.11 Hot Water System T ype Electric Storage Tank 0.92

— 0.95 0.32 0.30

— 0.31 Oil-Fired Storage Tank 0.51

— 0.68 0.88 0.45

— 0.60 Gas-Fired Storage Tank 0.59 0.62 0.70 0.92 0.54 0.57 0.64 Electric Heat Pump Tank 0.92 2.00 2.35 0.32 0.30 0.64 0.76 Electric Instantaneous 0.93

— 0.99 0.32 0.30

— 0.32 Gas-Fired Instantaneous 0.54 0.82 0.94 0.92 0.50 0.75 0.87 Table 5.1 Site vs. Source Energy E ffi ciency of Residential Heating, Cooling and Hot Water Systems

3OURCE -)4%) #/0 FOR 'ROUND 3OURCE (EAT 0UMP 3YSTEMS † 3PLIT 3YSTEMS ‡ #LOSED ,OOP 3YSTEMS

-ORE IMPORTANTLY 4ABLE  SHOWS THE DIFFERENCE BETWEEN hSITEv 3#/0 AND hSOURCEv &ULL
&UEL #YCLE &&# ENERGY EFlCIENCIES &&# EFlCIENCIES
ACCOUNT FOR ALL THE ENERGY USED TO EXTRACT RElNE
CONVERT AND TRANSPORT THE FUEL TO THE END USER AS WELL AS THE EFlCIENCY OF THE END
USE EQUIPMENT !LMOST ALL BUILDING ENERGY EQUIPMENT IS SOLD ON THE BASIS OF END USE OR hSITEv ENERGY EFlCIENCY (OWEVER LOOKING AT SITE OR END
USE EFlCIENCY ALONE MASKS LARGE ENERGY CONVERSION LOSSES PARTICULARLY THOSE FROM GENERATING ELECTRICITY &&# EFlCIENCY COMBINES THESE SOURCE
TO
SITE LOSSES WITH END
USE ENERGY CONSUMPTION
&IGURE  SHOWS THE h3OURCE TO 3ITEv ENERGY LOSSES OF BRINGING ENERGY TO THE CONSUMER !LL FUELS WHETHER COAL OR NATURAL GAS FOR POWER GENERATION OR OIL AND NATURAL GAS FOR HOUSEHOLD
USE CONSUME SOME ENERGY IN THE EXTRACTION PROCESSING AND BULK TRANSPORTATION OF FUEL 4HERE IS ALSO ADDITIONAL ENERGY USE OR LOSSES IN THE DELIVERY OF ELECTRICITY AND FUELS TO THE RETAIL CUSTOMER SUCH AS THE TRANSMISSION AND DISTRIBU

TION 4$ OF ELECTRICITY DISTRIBUTION SYSTEMS FOR NATURAL GAS OR TRUCK DELIVERY OF HOME HEATING OIL 4HE BIGGEST DIFFERENCE COMES IN THE CONVER

SION LOSSES ASSOCIATED WITH ELECTRICITY PRODUCTION 7HEN THESE ARE ALL ADDED TOGETHER SOURCE TO SITE LOSSES FOR ELECTRICITY ARE  COMPARED TO  FOR NATURAL GAS AND  FOR HOME HEATING OIL  4HESE hSOURCE TO SITEv LOSSES ARE THEN COMBINED WITH END
USE ENERGY EFlCIENCIES TO CALCULATE THE &&# EFlCIENCIES AS SHOWN IN 4ABLE 116 MIT S T U D Y ON T HE FU T URE O F N A T URAL GA S Figure 5.8 Combined Source to Site Energy E ffi ciencies for Delivering Coal and Natural Gas-Fired Generation Versus Oil and Natural Gas to End-Use Customers

Source to Site — Coal-Fired Generation Source to Site — Natural Gas-Fired Generation

Source to Site — Direct-Use Natural Gas Source to Site — Home Heating Oil 100 100

100 100 Extraction Processing Transport Generation Avg Coal Avg Gas

T&D Extraction Processing Transport Generation T&D

Extraction Processing Transport No Generation Equivalent Distribution Extraction Processing Transport No Generation Equivalent New Coal 36 33

Distribution 89 89 90 96 98 97 97 94 93 96

31 29 37 39 New Gas 47 44

92 93 94 97

3OURCE '4) AND %)! 

FINDING Source-to-site energy losses should be considered when choosing among energy options, especially ones that use di ff erent energy carriers.

)N  A .ATIONAL 2ESEARCH #OUNCIL REPORT RECOMMENDED THAT THE $/% MOVE TO THE &&# APPROACH IN SETTING ENERGY EFlCIENCY AND APPLIANCE STANDARDS ESPECIALLY WHEN THERE

ARE MULTIPLE FUEL CHOICES )N  THE $/% INITIATED A RULEMAKING PROCESS TO MOVE TOWARD THE &&# APPROACH IN THE DESIGN OF EFlCIENCY standards for appliances and space condition

ING AND HOT WATER SYSTEMS  4HE MAIN COMPARISON TO DRAW FROM 4ABLE  IS THAT ALTHOUGH HEAT PUMP SYSTEMS AS WELL AS CENTRAL AIR CONDITIONERS HAVE SIGNIlCANTLY HIGHER SITE ENERGY EFlCIENCIES WHEN ROUGHLY TWO
THIRDS LOSSES IN ELECTRICITY GENERATION AND TRANSMISSION ARE INCLUDED THESE GAINS EFFEC

TIVELY DISAPPEAR EXCEPT FOR THE MOST EFlCIENT SYSTEMS 4HUS IMPROVED EFlCIENCY INFORMATION IS NEEDED TO ALLOW CONSUMERS TO ACCURATELY COMPARE THE OVERALL ENERGY EFlCIENCY AND COST effectiveness of direct fuel and electricity end

USES 4HIS IS ESPECIALLY TRUE FOR SPACE CONDITION

ING AND HOT WATER SYSTEMSChapter 5: Demand 117 RECOMMENDATION I mproved energy e ffi ciency metrics that provide an FF C comparison of energy

e ffi ciency should be incorporated into national standard setting activities. T he improved metrics should include both FF C e ffi ciency and cost-to-consumer factors.
Looking Beyond Equipment Efficiency Standards

&&# AND END
USE EFlCIENCIES ALONE ARE NOT ENOUGH TO DETERMINE WHICH BUILDING ENERGY SYSTEMS WILL HAVE THE LOWEST COST TO THE CON

SUMER 4HE COST EFFECTIVENESS OF SPACE CONDI

TIONING AND OTHER TECHNOLOGIES IS A MIX OF EQUIPMENT EFlCIENCY AND FUEL COSTS EQUIPMENT
COSTS INCLUDING OPERATION AND MAINTENANCE COSTS AS WELL AS THE DUTY
CYCLE OF THE SYSTEM &OR EXAMPLE A LESS EFlCIENT ELECTRIC FURNACE MAY BE MORE COST EFFECTIVE ON A TOTAL COST
TO

CONSUMER BASIS IN REGIONS WHERE IT GETS COLD ONLY OCCASIONALLY ELECTRICITY PRICES ARE LOW OR THE HOUSING UNIT IS NOT OCCUPIED YEAR
ROUND

4HE DEPTH AND DURATION OF A REGIONS HEATING AND COOLING SEASONS HAVE A DRAMATIC IMPACT ON THE APPLICABILITY AND OVERALL COST EFFECTIVENESS OF DIFFERENT ENERGY TECHNOLOGIES (EATING AND COOLING DEGREE DAYS ARE A ROUGH ESTIMATE OF

A REGIONS ANNUAL HEATING AND COOLING NEEDS AND COMPARE THE DAILY AVERAGE TEMPERATURE TO A REFERENCE TEMPERATURE USUALLY & IN THE 53	 &OR EXAMPLE .EW 9ORK #ITY AND 3T ,OUIS HAVE  FEWER HEATING DEGREE DAYS THAN -INNEAPOLIS
3T 0AUL (OWEVER 3T ,OUIS IS CONSIDERABLY WARMER THAN .EW 9ORK #ITY WITH ALMOST HALF AGAIN AS MANY COOLING DEGREE DAYS $IFFERENT REGIONS OF THE 53 AND EVEN DIFFERENT LOCATIONS WITHIN STATES HAVE VERY DIFFERENT HEATING AND COOLING REQUIREMENTS AND SO GENERIC APPLIANCE EFlCIENCY STANDARDS MAY NOT PROVIDE ENOUGH INFORMATION TO MAKE THE BEST CHOICE !S SUCH NO CITY IS hTYPICALv AND THEREFORE TAILORED INFORMATION IS NEEDED IN ORDER FOR
CONSUMERS ARCHITECTS BUILDERS AND OTHERS TO MAKE BETTER CHOICES !DD TO THIS INFORMATION ABOUT REGIONAL BUILDING STOCK AGE AND EFl

CIENCY AND DEMOGRAPHIC FACTORS AND THE NEED FOR A MORE NUANCED APPROACH TO DESIGNING COST EFFECTIVE LOW
CARBON BUILDING ENERGY POLICIES BECOMES MORE PRONOUNCED

FINDING E nergy e ffi ciency metrics alone are not

su ffi cient to inform consumers about the most energy e ffi cient and cost-e ff ective options for meeting household energy needs in di ff erent regions.
!LTHOUGH h%NERGY 'UIDEv LABELS FOR APPLIANCES SUCH AS HOT WATER HEATERS AIR CONDITIONERS AND HEAT PUMPS ARE COMMONPLACE IN RETAIL ESTAB

LISHMENTS COMPARATIVE ENERGY AND LIFE
CYCLE
COST INFORMATION IS FAR FROM PROMINENT IN STORES AND ON MAJOR RETAILERS WEBSITES EVEN WHEN PERFORMING HEAD
TO
HEAD COMPARISONS OF SIMILAR PRODUCTS

RECOMMENDATION I n addition to improved e ffi ciency metrics for comparing appliances and building energy technologies, there is a need to inform consumers and developers as well as state and local regulators about the
cost-e ff ectiveness and suitability of various technologies, relative to local conditions.118 MIT S T U D Y ON T HE FU T URE O F N A T URAL GA S FFC Efficiency and CO 2 Emissions

7HEN CONSIDERING CLIMATE POLICY THE SITUATION BECOMES EVEN MORE COMPLEX 7HILE THE CARBON content of retail fuels is reasonably consistent

ACROSS THE 53 THIS IS NOT SO FOR ELECTRICITY WHERE REGIONAL DIFFERENCES IN THE MIX OF GENERA

TION CAN SUBSTANTIALLY IMPACT THE #/ 2 EMISSIONS ASSOCIATED WITH ELECTRICITY USE 4ABLE  SHOWS HOW SOURCE
TO
SITE EFlCIENCY FACTORS AND #/ 2 EMISSIONS RATES CHANGE ACROSS THE CONTINENTAL 53 %FlCIENCY AND EMISSIONS FACTORS ARE ALSO SHOWN BY .ORTH !MERICAN %LECTRIC 2ELIABILITY #ORPORATION .%2# REGION

)N ALL CASES SOURCE
TO
SITE #/ 2 EMISSIONS FROM DIRECT COMBUSTION OF FUELS ARE SUBSTANTIALLY LOWER THAN FROM THE USE OF ELECTRICITY 2EGIONS WITH GREATER CONCENTRATIONS OF COAL
lRED GENERA

TION COMMONLY HAVE both HIGHER SOURCE
TO
SITE LOSSES AS WELL AS HIGHER CARBON CONTENT FUELS !LSO INCLUDED IN 4ABLE  ARE THE PRE
COMBUSTION #/ 2 EMISSIONS FROM THE EXTRACTION PROCESSING AND TRANSPORTATION OF BULK FUELS 4HE SOURCE
TO SITE EFlCIENCY FACTORS FOR ELECTRICITY IN 4ABLE  VARY BY  TO  AROUND THE NATIONAL AVERAGE OF  -OST OF THIS IS DUE TO THE FUEL MIX ESPECIALLY THE MIX OF COAL VERSUS NATURAL GAS NUCLEAR AND HYDROPOWER IN EACH .%2# REGION 4HESE DIFFERENCES BECOME MAGNIlED IN A MEA

SURE OF #/ 2 EMISSIONS PER UNIT OF GENERATION WHERE IN  THE #/ 2 content of electricity VARIED BY  TO  AROUND THE NATIONAL AVERAGE OF  LB #/ 2 PER -7H

Table 5.2 Retail Electricity and Fuel — Source-to-Site E ffi ciencies and CO 2 Emissions

3OURCE %NERGY AND %MISSIONS &ACTORS FOR "UILDING %NERGY #ONSUMPTION 'AS 4ECHNOLOGY )NSTITUTE 

Regional Site-to-Source and CO 2 E missions Factors by NE R C Region (2005) Source-toSite E ffi ciency CO 2 E missions (lb CO 2 / M Wh) ∆ % from US Avg. Precomb. Generation T&D Combined United States A verage US 0.32 54 1,329 86 1,469

– Midwest Reliability Organization MRO 0.28 55 1,824 120 1,999 36.1 Southwest Power Pool SPP 0.30 63 1,751 114 1929 31.3 Reliability First Corporation RFC 0.31 38 1,427 94 1,559 6.1 Florida Reliability Coordinating Council FRCC 0.33 99 1,319 91 1,508 2.6 SERC Reliability Corporation SERC 0.31 45 1,369 90 1,504 2.4 Texas Regional Entity TRE 0.32 74 1,324 87 1,485 1.1 Western Electricity Coordinating Council WECC 0.38 51 1,033 57 1,142 -22.3

Northeast Power Coordinating Council NPCC 0.33 85 876 61 1,022 -30.4 Primary Residential Fuels Precomb. Distribution Combustion Combined Distillate Oil US 0.89 107 4 550 661 -55.0 Liquid Petroleum Gas US 0.89 74 4 476 553 -62.3 Natural Gas US 0.92 36 5 404 444 -69.8Chapter 5: Demand 119 3PACE CONDITIONING AND HOT WATER HEATING SYSTEMS HAVE A BROAD RANGE OF END USE AND &&# EFlCIENCIES AND THE GEOGRAPHIC ATTRIBUTES OF HEATING AND COOLING DEMANDS AND HOW ELEC

TRICITY IS GENERATED CAN DRAMATICALLY IMPACT OVERALL ENERGY CONSUMPTION AND #/ 2 EMISSIONS 4ABLE  PUTS THIS INFORMATION TOGETHER &OR  -7H OF h5SEFUL %NERGY $EMANDv

 HEAT

ING OR COOLING DELIVERED INSIDE THE BUILDING

 THE TABLE SHOWS HOW MUCH RETAIL SITE AND PRIMARY SOURCE ENERGY WAS NEEDED AS WELL AS HOW MUCH TOTAL #/ 2 WAS EMITTED 4HIS INFOR

MATION IS SHOWN AT BOTH THE NATIONAL LEVEL AND FOR SELECT .%2# REGIONS WHERE EMISSIONS ARE HIGH OR LOW AND THERE ARE LARGE HEATING OR COOLING SEASONS 4HE RESULTS IDENTIFY THE DANGERS OF A hONE SIZE lTS ALLv APPROACH %VEN MOVING TO GENERIC &&# EFlCIENCY AND EMISSIONS METRICS HIDES IMPOR

TANT DIFFERENCES &OR #/ 2 EMISSIONS GAS
lRED FURNACES AND AIR
SOURCE HEAT PUMPS HAVE ROUGHLY EQUIVALENT #/ 2 EMISSIONS USING NATIONAL AVERAGES 7HEN WE LOOK AT HIGHER EMISSIONS .%2# REGIONS SUCH AS THE 3OUTHWEST 0OWER 0OOL 300 WHICH COVERS PARTS OF +ANSAS /KLAHOMA 4EXAS AND NEIGHBORING STATES THE ELECTRIC
FUELED OPTIONS HAVE SUB STANTIALLY HIGHER #/ 2 EMISSIONS %VEN GROUND

SOURCE HEAT PUMPS WITH HIGHER #/0 EFlCIENCIES RESULT IN HIGHER #/ 2 EMISSIONS THAN THE DIRECT USE OF NATURAL GAS IN REGIONS WHERE ELECTRIC SECTOR #/ 2 EMISSIONS ARE HIGH Table 5.3 Combined Energy and Emissions Impacts of Using FFC E ffi ciency for Select NERC Regions for Energy Star Appliances

E nergy C onsumption ( M Wh) Full Fuel C ycle CO 2 E missions ( T on CO 2 ) Useful Site FFC National MRO NPCC SPP TRE Heating System T ype Electric Furnaces 100 101.0 314.2 74 114 49 104 75 Oil-Fired Furnaces 100 120.5 136.7 45 Gas-Fired Furnaces 100 111.1 120.7 27 Air Source Heat Pumps † 100 41.7 129.6 31 47 20 43 31 Ground Source Heat Pumps ‡ 100 30.3 94.3 22 34 15 31 23 C ooling System T ype Central AC † 100 23.5 73.2 17 27 11 24 17 Air Source Heat Pumps † 100 23.5 73.2 17 27 11 24 17 Ground Source Heat Pumps ‡ 100 24.2 75.3 18 27 12 25 18 Hot Water System T ype Electric Storage Tank 100 105.3 327.4 77 119 51 109 78 Oil-Fired Storage Tank 100 147.1 166.9 55 Gas-Fired Storage Tank 100 161.3 175.2 39 Electric Heat Pump Tank 100 50.0 155.5 37 56 24 52 37

Electric Instantaneous 100 101.0 314.2 74 114 49 104 75 Gas-Fired Instantaneous 100 122.0 132.5 29

#/0 FOR 'ROUND 3OURCE (EAT 0UMP 3YSTEMS † 3PLIT 3YSTEMS ‡ #LOSED ,OOP 3YSTEMS 3OURCE -)4%) 4ON #/ 2  -7H 5SEFUL %NERGY120 MIT S T U D Y ON T HE FU T URE O F N A T URAL GA S SUCH AS THE -IDWEST 2ELIABILITY /RGANIZATION -2/	 #ONVERSELY IN REGIONS WHERE ELECTRIC POWER COMES FROM CLEANER SOURCES INCLUDING NATURAL GAS LIKE THE .ORTHEAST 0OWER #OORDI

NATING #OUNCIL .0## HEAT PUMP SYSTEMS HAVE BETTER #/ 2 EMISSIONS RATES THAN THE DIRECT

USE OF NATURAL GAS

 ALTHOUGH AIR
SOURCE HEAT PUMPS MAY NOT BE APPLICABLE THROUGHOUT THE ENTIRE .ORTHEAST

F I N D I N G Use of equipment-based FF C e ffi ciency and national average energy demand and CO 2 emissions metrics alone are not su ffi cient to inform policy makers and consumers of the comparative cost and environmental benefits of competing appliances and building energy systems.

RECOMMENDATION M ore detailed and targeted approachesare needed to develop combined costand emissions-e ff ective strategies for meeting future energy and emissions goals on a local and regional basis. State and Federal agencies should collaborate with the building industry and equipment manufacturers to provide clear and accurate information to consumers.

4HE lNDINGS REGARDING &&# EFlCIENCY THE COMPARATIVE DUTY
CYCLES OF SPACE CONDITIONING AND OTHER TECHNOLOGIES PLUS THE #/ 2 burdens of different fuels including regional differences IN POWER GENERATION IDENTIFY THE NEED TO DEVELOP MORE TAILORED ENERGY POLICIES FOR TRANSFORMING THE 2ESIDENTIAL SECTOR AND BY EXTENSION ALL BUILDINGS 4HIS INCLUDES TOTAL BUILDING ENERGY PERFORMANCE AND NOT JUST &&# EFlCIENCIES COST
EFFECTIVENESS AND THE EMIS

sions-effectiveness of space conditioning and HOT WATER SYSTEMS &OR POLICY MAKERS THIS SHOULD ALSO INCLUDE LOCAL AND REGIONAL BUILDING STOCK TRENDS INCLUDING BUILDING RETROlTS AND

NEW CONSTRUCTION

4HE EFlCIENCIES FOR THE BEST HEATING COOLING AND HOT WATER TECHNOLOGIES ARE ALREADY VERY HIGH SO THERMODYNAMICALLY WE CANNOT EXPECT MUCH IMPROVEMENT 4HEREFORE POLICIES AFFECT

ING 2$$ IN THIS AREA WOULD REASONABLY FOCUS

ON MANUFACTURING COST
REDUCTIONS AND LOCAL CAPACITY BUILDING FOR hPLUG
AND
PLAYv INSTALLA

TION OF NEW SYSTEMS IN BOTH RETROlT AND NEW BUILD APPLICATIONS !S MENTIONED ABOVE THIS ALSO NEEDS A PUBLIC EDUCATION AND AWARENESS COMPONENT FOCUSING ON HOW WELL VARIOUS TECHNOLOGIES MATCH LOCAL CONDITIONS AS WELL AS THE DEVELOPMENT OF WELL
TRAINED LOCAL PRACTI TIONERS ABLE TO SPECIFY INSTALL AND MAINTAIN
COST AND EMISSION
EFFECTIVE BUILDING ENERGY SYSTEMS

D EMAND F OR N ATURAL GAS A S A T RANSPORTAT I ON F UEL

4HE 4RANSPORTATION SECTOR POSES A DUAL CHAL

LENGE IN A CARBON
CONSTRAINED FUTURE &IRST THE 4RANSPORTATION SECTOR IS RESPONSIBLE FOR ABOUT A THIRD OF #/ 2 EMISSIONS FROM THE 53 ECONOMY 3ECOND THE 4RANSPORTATION SECTOR IS CURRENTLY ALMOST WHOLLY DEPENDENT ON OIL AS A TRANSPOR

TATION FUEL MAKING IT VERY CHALLENGING TO REDUCE THOSE EMISSIONS TO ANY SIGNIlCANT EXTENT 4HE CONCENTRATION OF RESOURCES IN THE -IDDLE %AST AND THE LARGE BALANCE OF PAYMENT DElCIT CREATED BY ABOUT  MILLION BARRELS PER DAY BPD OF 53 OIL IMPORTS CONSPIRE TO MAKE OIL USE IN THE 4RANSPORTATION SECTOR A MAJOR ENERGY SECURITY PROBLEM AS WELL )N THIS SECTION OF THE CHAPTER

WE LOOK AT HOW THESE TWO CHALLENGES MIGHT BE TACKLED TO BOTH REDUCE THE OIL DEPENDENCY OF TRANSPORTATION IN THE 53 AND TO REDUCE THE #/ 2 EMISSIONS THAT GO WITH IT
Natural gas is garnering attention for its POTENTIAL TO ADDRESS THESE CHALLENGES IN AN ECONOMICALLY ATTRACTIVE WAY .ATURAL GAS PRODUCES SIGNIlCANTLY LESS #/ 2 THAN OIL WHENChapter 5: Demand 121 COMBUSTED )T IS ALSO AN ABUNDANT DOMESTIC

RESOURCE WITH A PRICE THAT ON AN ENERGY EQUIVA

LENT BASIS IS SUBSTANTIALLY LOWER THAN THAT OF OIL #ONSEQUENTLY THERE IS THE POSSIBILITY FOR SUBSTANTIAL ENERGY SECURITY AND ENVIRONMENTAL BENElTS TO BE GAINED BY THE PENETRATION OF NATURAL GAS INTO THE 4RANSPORTATION SECTOR !BOUT  4CF OF NATURAL GAS PER YEAR

 SLIGHTLY LESS THAN  OF CURRENT 53 CONSUMPTION

 COULD DISPLACE APPROXIMATELY  MILLION BPD

 ABOUT  OF CURRENT 53 CONSUMPTION

7E EXPLORE THIS OPPORTUNITY IN TWO WAYS DIRECT

USE OF COMPRESSED NATURAL GAS #.' AND LIQUElED NATURAL GAS ,.' IN VEHICLES AND INDIRECT USE THROUGH CONVERSION OF NATURAL GAS TO LIQUID FUELS 4HE ATTRACTION OF THE INDIRECT PATHWAY IS THE POTENTIAL TO CAPITALIZE ON THE large-scale liquid fuel infrastructure in place AND TO USE CURRENT VEHICLES OR VEHICLES VERY SIMILAR TO THOSE ON THE ROAD TODAY

Global Natural Gas Vehicle Marke t 32

4HERE ARE APPROXIMATELY  MILLION NATURAL GAS VEHICLES .'6 ON THE ROAD WORLDWIDE OF WHICH MORE THAN  ARE OPERATED ON #.' THE REST BEING ,.'
POWERED TRUCKS #.' VEHICLES ARE A SMALL FRACTION ON THE ORDER OF  OF THE CLOSE TO  MILLION VEHICLES ON THE ROAD WORLDWIDE 4HE .'6 WORLD MARKET IS PREDOMINATELY COMPRISED OF LIGHT
DUTY VEHICLES CONSISTING OF CARS AND LIGHT TRUCKS  WITH A SMALLER NUMBER OF BUSES  AND TRUCKS 	 4HE MAJORITY OF THE LIGHT
DUTY .'6S ARE BI
FUEL VEHICLES WITH THE ABILITY TO OPERATE ON #.'

OR GASOLINE

4HE LARGEST LIGHT
DUTY .'6 MARKETS ARE FOUND IN !SIA 0AKISTAN AND )RAN AND 3OUTH !MERICA !RGENTINA AND "RAZIL WHERE GOVERNMENT POLICIES SUPPORT THE USE OF .'6S .ATURAL GAS CAPABLE VEHICLES CONSTITUTE AROUND  OF THE VEHICLES IN !RGENTINA AND  IN 0AKISTAN %UROPE HAS ABOUT ONE MILLION #.' VEHICLES WHEREAS THERE ARE ONLY APPROXIMATELY  LIGHT
DUTY #.' VEHICLES IN THE 53

CNG-Powered Vehicles
#.'
POWERED VEHICLES USE SPARK
IGNITION ENGINES THAT ARE BASICALLY THE SAME AS THOSE USED IN GASOLINE
POWERED VEHICLES 4HEY CAN BE FACTORY
PRODUCED OR AFTERMARKET CONVERSIONS OF GASOLINE VEHICLES 4HE #.' IS STORED IN HIGH
PRESSURE TANKS EG AT  PSI TO OBTAIN SUFlCIENT ENERGY DENSITY FUEL ENERGY PER VOLUME	 %VEN WITH STORAGE AT HIGH PRESSURE THE RANGE OF A #.' VEHICLE FOR A GIVEN TANK SIZE IS ONLY ABOUT ONE
QUARTER THAT OF GASOLINE 5SE OF #.' REQUIRES A NEW FUELING INFRASTRUCTURE THAT WOULD REQUIRE SUBSTANTIAL ADDITIONAL INVESTMENT

"ECAUSE OF THE LOWER CARBONHYDROGEN RATIO OF METHANE RELATIVE TO GASOLINE THE #/ 2 EMISSIONS FROM THE COMBUSTION OF NATURAL GAS ARE APPROX

IMATELY  OF THOSE OF GASOLINE FOR A GIVEN
AMOUNT OF ENERGY PRODUCTION 4HUS ON AN ENERGY BASIS AT THE POINT OF USE THE #/ 2 EMISSIONS ARE REDUCED BY AROUND  RELATIVE
TO THE USE OF GASOLINE FOR THE SAME ENGINE EFlCIENCY /N A LIFE
CYCLE BASIS THIS ADVANTAGE IS REDUCED BECAUSE THE '(' EMISSIONS IN PRODUC

TION AND DISTRIBUTION INCLUDING METHANE LEAKAGE ARE GREATER FOR NATURAL GAS THAN FOR OIL PRODUCTS AS DISCUSSED IN !PPENDIX ! 33

4HE #.' VEHICLE MARKET SEGMENTS IN THE 53 THAT ARE LIKELY TO OFFER AN ATTRACTIVE PAYBACK PERIOD IN THE NEAR TERM INVOLVE HIGH MILEAGE

USE 4HESE INCLUDE SHORT
RANGE HEAVY
DUTY VEHICLES EG URBAN BUSES DELIVERY TRUCKS AND HIGH MILEAGE LIGHT
DUTY VEHICLES PRIMARILY mEET VEHICLES SUCH AS TAXIS BUSINESS AND GOVERN

MENT VEHICLES	 4HESE TWO MARKET SEGMENTS PRESENTLY HAVE A TOTAL POTENTIAL ASSUMING  PENETRATION IN THESE SEGMENTS OF122 MIT S T U D Y ON T HE FU T URE O F N A T URAL GA S  4CFYEAR

 EQUIVALENT TO  MILLION BPD 3HORT
RANGE HEAVY
DUTY VEHICLES ARE PARTICU

LARLY ATTRACTIVE FOR #.' BECAUSE THEY OPERATE WITH LOW MILEAGE PER GALLON RESULTING IN SUBSTANTIAL FUEL COST SAVINGS

FINDING A t present gasoline- CNG fuel price spreads,U.S. heavy-duty vehicles used for shortrange operation (buses, garbage trucks, delivery trucks) have attractive payback times (around three years or less). Payback times for U.S. light-duty vehicles are attractive provided they are used in high-mileage operation (generally in fleets) and have a su ffi ciently low incremental cost — a representative number is around $5,000 for a payback time of three years or less. T his condition is presently not met.

!LTHOUGH #.' IS SUBSTANTIALLY CHEAPER THAN GASOLINE ON AN ENERGY BASIS ITS USE REQUIRES SIGNIlCANT ADDITIONAL UPFRONT VEHICLE COSTS 4HUS A KEY FACTOR IN #.' VEHICLE MARKET PENETRATION IS A SUFlCIENTLY SHORT TIME TO COMPENSATE THE HIGHER COST OF A #.' VEHICLE WITH LOWER
PRICED NATURAL GAS )N THE 53 INCREMENTAL COSTS ARE HIGH PARTICULARLY FOR AFTERMARKET CONVERSIONS 4HE ONLY FACTORY PRODUCED #.' VEHICLE IN THE 53 IS THE (ONDA '8 WHICH PRESENTLY HAS AN INCREMENTAL
COST RELATIVE TO AN EQUIVALENT GASOLINE VEHICLE OF ABOUT  AND MAY BE COMPARED TO THE PREMIUM OF ABOUT  FOR THE %UROPEAN 67 0ASSAT 43) %CO
FUEL 4HE (ONDA '8 OFFERS ONLY NATURAL GAS OPERATION AND THEREBY HAS RECEIVED

A TAX SUBSIDY NOT GIVEN TO FACTORY
PRODUCED VEHICLES PROVIDING BI
FUEL OPERATION )N CON

TRAST 67 %CO
FUEL AND &IAT VEHICLES PRODUCED IN %UROPE DO OFFER BI
FUEL OPERATION INCREASING mEXIBILITY WHICH IS CRUCIAL FOR NON
mEET USERS

!FTERMARKET CONVERSIONS ARE AVAILABLE FOR A WIDE RANGE OF 53 CARS AND LIGHT TRUCKS AND PROVIDE BI
FUEL OPERATION (OWEVER COSTS ARE APPROXIMATELY  PER VEHICLE WITH lRMS CARRYING OUT THE CONVERSIONS POINTING TO 53 %0! CERTIlCATION PROCEDURES FOR THE HIGH EXPENSE )N CONTRAST CONVERSIONS ARE BEING PROVIDED FOR AROUND  PER VEHICLE IN 3INGAPORE

FINDING E xperience in other countries indicates the potential for substantial reduction of incremental costs for U.S. factory and aftermarket converted CNG vehicles.

Table 5.4 Illustrative Payback Times in Years for CNG Light-Duty Vehicles for Average and High Mileage Use, Low and High Incremental Vehicle Cost and Fuel Price Spread between Gasoline and CNG on a Gallon of Gasoline Equivalent (gge) Basis. Assumes 30 miles per gallon. 12,000 mile per year 35,000 miles per yearFuelPriceSpread I ncremental C ost $3,000 $10,000 $3,000 $10,000 $0.50/gge 15 50 5.2 17 $1.50/gge 5 17 1.8 5.9

3OURCE -)4%)Chapter 5: Demand 123 4ABLE  ILLUSTRATES THE EFFECTS OF VARIOUS FACTORS

ON PAYBACK TIME FOR LIGHT
DUTY VEHICLES 4HE FUEL PRICE SPREAD OF GGE SHOWN IN THE TABLE WOULD BE ASSOCIATED WITH A GALLON PUMP PRICE FOR GASOLINE AND RESIDENTIAL GAS AT THE CONSUMER LEVEL OF --"TU  0AYBACK TIME IS THE INCREMENTAL COST DIVIDED BY THE YEARLY FUEL COST SAVINGS 3TUDIES HAVE SHOWN THAT PAYBACK TIMES OF AROUND THREE YEARS OR LESS ARE NEEDED FOR SUBSTANTIAL MARKET PENETRATION  &OR THE REPRESENTATIVE HIGH
MILEAGE USE CASE OF  MILESYEAR A THREE
YEAR PAYBACK TIME COULD BE OBTAINED WITH A 53 PRICE SPREAD OF GGE AND AN INCREMENTAL VEHICLE COST OF AROUND 

&OR PRESENT #.' VEHICLE COSTS AND 53 FUEL PRICE SPREADS THE PAYBACK TIMES ARE GENERALLY UNATTRACTIVE FOR THE AVERAGE MILEAGE USE  MILESYEAR MARKET SEGMENT FOR LIGHT
DUTY VEHICLES THIS MARKET SEGMENT REPRESENTS OVER  OF LIGHT
DUTY VEHICLE FUEL USE 2EDUCTION OF THE INCREMENTAL COST TO BELOW  ALONG WITH GGE FUEL PRICE SPREAD WOULD BE NEEDED FOR A THREE
YEAR PAYBACK TIME 4HE
RATE OF PENETRATION OF AVERAGE MILEAGE #.' VEHICLES EVEN IF ECONOMIC WILL DEPEND ON THE PROVISION OF AN ADEQUATE PUBLIC REFUELING INFRASTRUCTURE THOUGH HOME REFUELING OF #.' VEHICLES COULD AUGMENT PUBLIC FACILITIES

4ABLE  DOES NOT INCLUDE THE EFFECT OF A PENALTY

ON CARBON EMISSIONS OR A SUBSIDY &OR THE ILLUSTRA

TIVE CASE IN THE TABLE THE USE OF #.' RATHER THAN GASOLINE REDUCES #/ 2 EMISSIONS AT THE VEHICLE BY ABOUT  TONYEAR FOR THE AVERAGE MILEAGE  MILESYEAR LIGHT
DUTY VEHICLE %VEN FOR A #/ 2 PRICE AS HIGH AS TON THE IMPACT

ON PAYBACK TIME IS SMALL

)F THE GASOLINE
#.' PRICE SPREAD WERE TO INCREASE BEYOND THE PRESENT LEVEL THE PAYBACK TIME FOR THE AVERAGE MILEAGE #.' VEHICLE COULD DECLINE AND SUPPORT GREATER PENETRATION IN THIS LARGE MARKET SEGMENT ! SIGNIlCANT INCREASE IN THE SPREAD COULD OCCUR EITHER THROUGH AN INCREASED OIL
NATURAL GAS PRICE SPREAD A VERY HIGH #/ 2 PRICE ANDOR AVAILABILITY OF NATURAL GAS FOR #.' VEHICLES AT LOWER THAN RESIDENTIAL
RATES 5SING OPTIMISTIC COST ESTIMATES FOR #.' VEHICLES THE CARBON POLICY SCENARIO EXPLORED IN #HAPTER  PROJECTS A  PENETRATION INTO THE PRIVATE VEHICLE mEET BY  TO  2ECENTLY ENACTED STATE LOW
CARBON FUEL STANDARDS EG #ALIFORNIA MIGHT PROVIDE ADDITIONAL MOTIVATION FOR THE MARKET PENETRATION OF .'6S
%VOLUTIONARY TECHNOLOGY COULD INCREASE THE FUEL EFlCIENCY OF BI
FUEL ENGINES BY  TO  PROVIDING AN EFlCIENCY LEVEL COMPARABLE
TO A DIESEL ENGINE   4HIS COULD INCREASE THE value of natural gas in reducing oil dependence AND '(' GENERATION (IGHER EFlCIENCY NATURAL GAS
POWERED SPARK
IGNITION ENGINES ALSO HAVE THE POTENTIAL TO REDUCE THE COST AND INCREASE THE POWER OF ,.'
POWERED TRUCKS

RECOMMENDATION T he U.S. should consider revision to its current policies related to CNG vehicles, including how aftermarket CNG conversions are certified, with a view to reducing upfront costs and facilitating bi-fuel CNG

gasoline capability.

LNG-Powered Long-Haul Trucks

,.' IS BEING PURSUED AS A FUEL FOR TRUCK APPLICATIONS PARTICULARLY LONG
HAUL TRUCKING BECAUSE FOR A GIVEN TANK SIZE IT CAN PROVIDE A RANGE OF CLOSE TO TWO AND HALF TIMES THAT OF #.' AND AROUND  OF THAT OF DIESEL FUEL /N VEHICLE ,.' IS STORED AT VERY LOW TEMPERA

TURE 
# IN A DOUBLE
WALLED TANK WITH A
VACUUM BETWEEN THE WALLS TO PROVIDE THERMAL INSULATION /VER TIME THE ,.' WARMS THE METHANE GAS BOILS AND EVENTUALLY A PRESSURE RELIEF VALVE MUST BE OPENED IF THE TANK IS NOT RElLLED WITHIN A RELATIVELY LIMITED PERIOD OF TIME ABOUT A WEEK	 4HIS FEATURE CONSTRAINS THE USE OF ,.' TO VEHICLES THAT HAVE REGULAR124 MIT S T U D Y ON T HE FU T URE O F N A T URAL GA S FREQUENT RElLLS ,.' IS IN LIMITED USE IN THE 53 IN DRAYAGE TRUCKS IN THE PORTS OF ,ONG "EACH AND ,OS !NGELES AND IN GARBAGE TRUCKS IN SEVERAL CITIES

4HE '(' ADVANTAGE OF ,.' IS LOWER THAN #.' BECAUSE OF THE ENERGY LOSS IN LIQUEFACTION AND METHANE EMISSIONS IN FUELING AND OPERA

TION ! REPRESENTATIVE '(' EMISSION REDUCTION RELATIVE TO DIESEL FOR THE SAME ENGINE EFlCIENCY IS  TO  !S WITH THE #.'
GASOLINE COMPARISON NOTED EARLIER IN THE CHAPTER THIS MODEST '(' ADVANTAGE WOULD BE SUBSTANTIALLY REDUCED OR POSSIBLY ELIMINATED IF STATED ON A LIFE
CYCLE BASIS INCLUDING THE FUGITIVE EMISSIONS OF METHANE IN PRODUCTION AND DISTRIBUTION /F
COURSE THE OIL DISPLACEMENT BENElTS REMAIN

4HE CURRENT INCREMENTAL COST OF AN ,.' LONG
HAUL TRUCK IS AROUND  %VEN IF THE PAYBACK TIME IS ACCEPTABLE IT IS ABOUT FOUR YEARS AT LATE  NATURAL GAS AND OIL PRICES THIS HIGH INCREMENTAL COST CAN BE AN IMPEDI

MENT TO MARKET PENETRATION !N ADDITIONAL FACTOR IS THAT THE RESALE VALUE PARTICULARLY IN THE INTERNATIONAL MARKET WHERE MANY USED TRUCKS

ARE SOLD IS LIKELY TO BE SUBSTANTIALLY REDUCED !NOTHER CHALLENGE MAY BE ASSURING THAT RELI

ABILITY WILL NOT BE ADVERSELY AFFECTED BY OPERA

tional issues related to cryogenic fuel storage in

A TANK WITH VACUUM THERMAL INSULATION MANU

FACTURING ISSUES A COLLISION OR EXTENDED USE MAY REDUCE THE ABILITY OF THE TANK TO STORE ,.' CRYOGENICALLY	 )F THE INTEGRITY OF THE VACUUM IS COMPROMISED AND ,.' WARMS METHANE GAS BOILS OFF INCREASING PRESSURE IN THE TANK 4HE RELIEF VALVE IS USED TO VENT THE BOILED
OFF METHANE AND COOL THE REMAINING METHANE ! FURTHER CHALLENGE IS THE NEED FOR A NEW FUELING INFRASTRUCTURE THAT IS MORE EXPENSIVE AND COMPLEX THAN THE DIESEL FUELING INFRASTRUCTURE

4HE !MERICAN 4RUCKING !SSOCIATION REPRESENT

ING CONCERNS OF THE USER COMMUNITY HAS STATED THAT NATURAL GAS
POWERED TRUCKS ARE CURRENTLY NOT A VIABLE SOLUTION FOR MOST LONG
HAUL TRUCKING OPERATIONS FOR THESE TECHNICAL REASONS AND BECAUSE OF THE CONCERN THAT THE HIGH COST OF ,.' FUELING INFRASTRUCTURE WILL LIMIT COMPETI

TION IN THE ON
ROAD ,.' FUEL SUPPLY  LNGPOWERED TRUCKS MAY ALSO FACE COMPETITION FROM OTHER ALTERNATIVES TO DIESEL FUEL SUCH AS METHA

NOL AS DISCUSSED IN THE NEXT SECTION
)NDUSTRY IS WORKING ON REDUCING THE INCREMEN

TAL COST AND IMPROVING OPERATIONAL FEATURES RELATED TO THE USE OF A CRYOGENICALLY STORED FUEL )T IS LIKELY THAT A SIGNIlCANT COST REDUCTION CAN BE MADE PARTICULARLY IN THE COST OF THE ENGINE )N ADDITION USE OF ,.'
POWERED LONG
HAUL TRUCKS IS SIGNIlCANTLY LESS CHALLENGING IN THE GROWING AREA OF TRANSPORTING GOODS BETWEEN COMPANY
OWNED HUBS 4HESE HUBS COULD HAVE THEIR OWN ,.' FUELING STATIONS 4HIS IS A MODEST MARKET SEGMENT WHICH PRESENTLY
ACCOUNTS FOR LESS THAN  OF LONG
HAUL DIESEL FUEL CONSUMPTION )T HAS A MARKET POTENTIAL  MARKET PENETRATION OF LESS THAN  4CF PER YEAR 7ITH INCREASED USE OF HUBS IN LONG DISTANCE TRUCKING AND REDUCED RANGE REQUIRE

MENTS THERE MAY BE OPPORTUNITIES FOR USE OF #.' AS WELL AS ,.' 4HESE OPPORTUNITIES COULD BE ENHANCED BY BI
FUEL CAPABILITY WITH GASOLINE AS A RANGE EXTENDER

FINDING T he deployment of L NG -powered, longhaul trucks presently faces operational limitations due to the use of onboard fuel storage at very low temperature (-162 C  ̊); the need for a new fueling infrastructure that ensures competitive pricing; a high incremental cost; and a likely lower resale value particularly in the important international market. T hese challenges are mitigated by use in the relatively modest market of hub-to-hub transport.Chapter 5: Demand 125 Conversion to Liquid Fuels

!NOTHER ROUTE FOR NATURAL GAS PENETRATION INTO TRANSPORTATION MARKETS COULD BE THROUGH CONVERSION INTO A ROOM TEMPERATURE LIQUID FUEL THAT COULD BE BLENDED WITH OR REPLACE
CURRENT LIQUID FUELS DIESEL GASOLINE AND ETHANOL	 !S ILLUSTRATED IN &IGURE  A RANGE OF LIQUID FUELS CAN BE PRODUCED FROM NATURAL GAS BY THERMOCHEMICAL CONVERSION TO A SYNTHESIS GAS FOLLOWED BY CATALYTIC CONVERSION TO THE LIQUID FUEL 4HESE FUELS INCLUDE METHANOL ETHANOL MIXED ALCOHOLS METHANOL ETHANOL AND OTHERS AND DIESEL -ETHANOL CAN IN TURN BE CONVERTED INTO GASOLINE OR INTO DIMETHYL ETHER $-% A CLEAN
BURNING FUEL FOR DIESEL ENGINES

4HE CHOICES AMONG THESE MULTIPLE PATHWAYS TO liquid fuels depend on several criteria involving ENGINE REQUIREMENTS AND FUELING INFRASTRUCTURE $IESEL AND GASOLINE ARE DROP
IN FUELS WITH REGARD TO CURRENT ENGINE TECHNOLOGY AND FUELING INFRASTRUCTURE BUT REQUIRE MORE PROCESSING FROM NATURAL GAS FEEDSTOCK THAN OTHER ROUTES SUCH AS METHANOL PRODUCTION MAKING THE CONVERSION LESS EFlCIENT AND MORE COSTLY

-ETHANOL IS LESS COSTLY FOR CONVERSION BUT REQUIRES MODEST CHANGES TO ENGINES IT IS

MORE CORROSIVE THAN GASOLINE AND THE FUEL

ING INFRASTRUCTURE METHANOL AND ETHANOL ARE HYDROSCOPIC THAT HAS BEEN DEVELOPED FOR A PETROLEUM
BASED SYSTEM $-% REQUIRES MOD

ERATE PRESSURE FOR STORAGE AS A LIQUID SIMILAR TO PROPANE	 /VERALL SYSTEM OPTIMIZATIONS ARE NEEDED TO GUIDE CHOICES
Our detailed analysis is for natural gas conver

SION TO METHANOL 4HERE IS CONSIDERABLE EXPERI

ENCE FOR BOTH CONVERSION TO METHANOL AND FOR

USE OF METHANOL IN VEHICLES INCLUDING HIGH PERFORMANCE )NDY  CARS	 4HE EFlCIENCY OF CONVERSION OF NATURAL GAS INTO METHANOL MIXED ALCOHOLS AND $-% IS CONSIDERABLY HIGHER THAN THAT FOR THE CONVERSION OF NATURAL GAS INTO DIESEL AND GASOLINE
!MONG THE PROCESSES SHOWN IN &IGURE  THE

ONE THAT HAS BEEN OPERATED AT LARGE INDUSTRIAL SCALE OVER A LONG PERIOD WITH WELL
ESTABLISHED COSTS IS METHANE
TO
METHANOL CONVERSION MAINLY AS A FEEDSTOCK FOR CHEMICAL PRODUC

TION 39 -ETHANOL IS AN ALCOHOL THAT CAN BE USED LIKE ETHANOL IN MIXTURES WITH GASOLINE IN SPARK IGNITION ENGINES AND CAN BE EMPLOYED IN HEAVY DUTY AS WELL AS LIGHT
DUTY VEHICLES 7ITH THE energy loss during conversion of natural gas to METHANOL TAKEN INTO ACCOUNT THE WELL
TO
WHEELS #/ 2 EMISSIONS FROM USING NATURAL GAS DERIVED METHANOL IS SLIGHTLY LOWER THAN GASOLINE  '(' EMISSIONS COULD BE SOMEWHAT HIGHER THAN GASOLINE IF METHANE EMISSIONS ARE INCLUDED 4HE production cost of natural gas conversion to DIESEL FUEL IS PROJECTED TO BE AROUND  HIGHER THAN METHANOL ON AN ENERGY
EQUIVALENT BASIS )N ADDITION '(' EMISSIONS WOULD BE INCREASED BY MORE THAN  RELATIVE TO NATURAL GAS DERIVED METHANOL

Figure 5.9 Conversion of Natural Gas to Liquid Fuels

3OURCE -)4%) Natural Gas Reformer Synthesis Gas

Diesel Ethanol Mixed Alcohols Methanol

DME Gasoline 

### Natural Gas to Liquid Fuels
Catalyst126 MIT S T U D Y ON T HE FU T URE O F N A T URAL GA S -ETHANOL USED IN THE 53 IS MAINLY IMPORTED FROM THE #ARIBBEAN AND 3OUTH !MERICA AT COMPARABLE PRICES OVER THE PERIOD  TO  TO GASOLINE ON AN ENERGY
EQUIVALENT BASIS 7ITH DEPLOYMENT OF NEW PLANTS USING EXISTING TECHNOLOGY METHANOL COULD BE PRODUCED FROM 53 NATURAL GAS AT A COST LESS THAN 53 GASOLINE PRICE IN  OF AROUND GALLON EXCLUDING THE TAX	 4ABLE  SHOWS AN ILLUSTRATIVE PROJEC

TION OF METHANOL PRODUCTION COSTS )T IS BASED

ON A  ENERGY CONVERSION EFlCIENCY OF NATURAL GAS INTO METHANOL AND A CONTRIBUTION OF AMORTIZED CAPITAL AND OPERATING COSTS OF GGE OF METHANOL PRODUCTION   5NDER THESE ASSUMPTIONS THE SPREAD BETWEEN GASOLINE PRICE AND METHANOL COST IS AROUND GGE 4HE
COST ADVANTAGE OF METHANOL AT THE FUELING STATION IS REDUCED BY AROUND GGE DUE TO HIGHER COST PER UNIT ENERGY OF TRANSPORTING METHANOL TO FUELING STATIONS 4HE PRODUCTION
COST OF METHANOL AT THIS ASSUMED NATURAL GAS PRICE WOULD BE LOWER THAN THE COST OF CORN BASED ETHANOL BY MORE THAN GGE 

FINDING With deployment of plants using current technology, on an energy-equivalent basis, methanol could be produced from U.S. natural gas at a lower cost than gasoline at current oil prices.

-ETHANOL CAN BE USED IN SPARK
IGNITION ENGINES WITH VERY LOW EMISSIONS OF ./X AND OTHER POLLUTANTS THROUGH USE OF STATE
OF
THE
ART THREE
WAY CATALYTIC CONVERTERS )T HAS A HIGH
OCTANE NUMBER THAT ENABLES HIGH
EFlCIENCY ENGINE OPERATION -ETHANOL HAS THE DISADVAN

TAGE OF BEING ABLE TO PROVIDE ONLY AROUND HALF OF THE RANGE OF GASOLINE FOR A GIVEN TANK SIZE WHICH WOULD BE MITIGATED BY METHANOL GASOLINE MIXTURES

-ETHANOL USE WAS DEMONSTRATED IN THE 53 IN THE EARLY S IN SOME  VEHICLES )NTEREST WANED IN THE MID
S HOWEVER DUE
TO FALLING OIL PRICES AND THE ASCENDENCY OF ETHANOL IN LOW
CONCENTRATION BLENDS DRIVEN BY STRONG POLITICAL SUPPORT FROM THE FARM STATES )N ADDITION AVERSION TO METHANOL MAY HAVE DEVELOPED FROM ITS ASSOCIATION WITH -4"% -ETHYL 4ERTIARY "UTYL %THER AN ADDITIVE TO GASOLINE THAT CONTAMINATED GROUND WATER FROM LEAKS IN UNDERGROUND TANKS AND THAT UNLIKE METHANOL PRODUCED AN UNPLEASANT TASTE IN
WATER AT VERY LOW CONCENTRATIONS 4HE TOXICITY OF METHANOL IS SIMILAR TO GASOLINE -ETHANOL IS SOLUBLE IN WATER AND IS BIODEGRADABLE 

-ETHANOL COULD BE USED IN TRI
mEXIBLE
FUEL LIGHT
DUTY AND HEAVY
DUTY VEHICLES IN A
MANNER SIMILAR TO PRESENT ETHANOL
GASOLINE mEX FUEL VEHICLES WITH MODEST INCREMENTAL VEHICLE COST 4HESE TRI
mEX
FUEL VEHICLES COULD BE OPERATED ON A WIDE RANGE OF MIXTURES OF METHANOL ETHANOL AND GASOLINE &OR LONG DISTANCE DRIVING GASOLINE COULD BE USED IN THE mEX
FUEL ENGINE TO MAXIMIZE RANGE 0RESENT ETHANOL
GASOLINE mEX
FUEL VEHICLES IN THE 53

ARE SOLD AT THE SAME PRICE AS THEIR GASOLINE COUNTERPARTS !DDING METHANOL CAPABILITY TO

Table 5.5 Illustrative Methanol Production Costs, Relative to Gasoline (excluding taxes) at $2.30 per Gallon

3OURCE -)4%)

N atural G as Price M ethanol Production C ost, per gge C ost Reduction Relative to G asoline, per gge $4/MMBtu $1.30 $1.00 $6/MMBtu $1.60 $0.70 $8/MMBtu $2.00 $0.30Chapter 5: Demand 127 A FACTORY  ETHANOL BLEND % VEHICLE TO CREATE TRI
mEX FUEL CAPABILITY WOULD REQUIRE AN AIRFUEL MIXTURE CONTROL TO ACCOMMODATE AN EXPANDED FUELAIR RANGE WITH ADDITION OF AN ALCOHOL SENSOR AND WOULD RESULT IN AN EXTRA COST OF  TO  MOST LIKELY AT THE LOWER END OF THAT RANGE WITH SUFlCIENT PRODUCTION

FINDING M ethanol could be used in tri-flex-fuel lightduty vehicles with a modest incremental vehicle cost (likely to be $100 to $200 more than an ethanol-gasoline flex-fuel vehicle). I t could also be used to power long-haul trucks in mixtures with gasoline, and could provide both vehicle and fuel cost savings. Barriers to methanol use include the lack of incentives for vehicle conversion and provision of distribution infrastructure.

0RESENTLY NO FACTORY
PRODUCED mEX
FUEL VEHICLES IN THE 53 ARE EQUIPPED FOR mEX
FUEL OPERATION WITH METHANOL 2EMOVING THIS BARRIER THROUGH THE ADOPTION OF AN OPEN FUEL STANDARD IS A KEY REQUIREMENT FOR METHANOL USE TO BE PURSUED ON A LEVEL PLAYING lELD /PEN FUEL STANDARD LEGISLATION THAT HAS BEEN UNDER CONSIDERATION WOULD REQUIRE AUTOMOBILE MANUFACTURERS TO PRODUCE AN INCREASING NUMBER OF VEHICLES THAT COULD OPERATE ON A MIX OF THE THREE FUELS 2EQUIRING THIS mEX
FUEL CAPABILITY COULD BE A COST
EFFECTIVE WAY TO LEVEL THE PLAYING lELD FOR LIQUID FUELS and increase opportunities for reducing oil DEPENDENCE RECOMMENDATION T he U.S. government should implement an open fuel standard that requires automobile manufacturers to provide tri-flex-fuel operation in light-duty vehicles. I t should also consider methanol fueling infrastructure subsidies similar to those given to the fueling infrastructure for ethanol.

-ETHANOL CAN BE USED AS A FUEL FOR HEAVY
DUTY VEHICLES IN A RANGE OF MIXTURES WITH GASOLINE 5SE OF METHANOL AS AN ALTERNATIVE TO DIESEL FOR HEAVY
DUTY VEHICLES IS NOW POSSIBLE BY USE OF TURBOCHARGED SPARK
IGNITION ENGINES OPERATING
AT HIGH COMPRESSION RATIO AND HIGH LEVELS OF TURBO PRESSURE BOOSTING 4HESE ENGINES CAN PROVIDE COMPARABLE OR POSSIBLY BETTER EFlCIENCY THAN DIESEL ENGINES ALONG WITH COMPARABLE OR GREATER TORQUE AT LOWER VEHICLE COST AND WITH LOWER EMISSIONS AND MORE POWER  An illus

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A NUMBER OF CHALLENGES 4HEY INCLUDE THE lNANCIAL RISK FOR PRIVATE INVESTMENT IN 53 METHANOL PRODUCTION PLANTS THE DEMAND FOR METHANOL AS A TRANSPORTATION FUEL COULD BE REDUCED BY A DECLINE IN OIL PRICES AND DOMESTIC NATURAL GAS PRICES ARE VOLATILE )N ADDITION INCENTIVES ARE LACKING FOR BUILDING METHANOL CAPABILITY INTO VEHICLES AND INCURRING THE COSTS OF ADDITIONAL INFRASTRUCTURE SUCH AS PUMPS IN FUELING STATIONS )T IS LIKELY THAT SOME FORM OF GOVERNMENT ASSISTANCE WOULD BE NECESSARY TO FACILITATE THIS OPTION AT LARGE SCALE128 MIT S T U D Y ON T HE FU T URE O F N A T URAL GA S )N SUMMARY WHILE USE OF METHANOL AS A TRANSPORTATION FUEL HAS SUBSTANTIAL COST AND '(' ADVANTAGES RELATIVE TO OTHER NATURAL GAS DERIVED LIQUID FUELS IT REQUIRES SOME INFRA
STRUCTURE MODIlCATION AND FACES SUBSTANTIAL ACCEPTANCE BARRIERS !T SUFlCIENTLY HIGH OIL PRICES THE DROP
IN FUEL AND ACCEPTANCE ADVAN

TAGES OF NATURAL GAS DERIVED GASOLINE MAY MAKE IT A BETTER CANDIDATE THAN METHANOL .ATURAL GAS DERIVED DIESEL COULD ALSO BECOME ECONOMICALLY ATTRACTIVE

FINDING I f the present oil to natural gas price spread is sustained, there will be materially increased opportunities for use of natural gas-based transportation fuels.

FINDING T he potential for natural gas to reduce oil dependence could be increased by conversion into room temperature liquid fuels that can be stored at atmospheric
pressure. O f these fuels, methanol is the only one that has been produced for a long period at large industrial scale. M ethanol has the lowest cost and lowest G H G emissions, but requires some infrastructure modification and faces substantial acceptance challenges. N atural gas derived gasoline and diesel have the advantage of being drop-in fuels, but carry a higher conversion cost. RECOMMENDATION T he U.S. government should carry out a transparent comparative study of natural gas derived diesel, gasoline and methanol, and possibly natural gas derived ethanol, mixed alcohol and DME , with each other and with oil-derived fuels and biofuels. T he study should include cost analysis, vehicle requirements, infrastructure requirements and health and environmental issues. I t also should include discussion of R& D needs for

more e ffi cient and lower-cost production.Chapter 5: Demand 129 N OTES

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MILESGALLON AND A  -
DIESEL PRICE SPREAD WITH --"TU NATURAL GAS AND THE SAME ENGINE EFlCIENCY - IS  METHANOL AND  GASOLINE BY VOLUME AND HAS A RANGE OF AROUND X THE RANGE OF DIESEL FOR A GIVEN FUEL TANK SIZEChapter 6: Infrastructure 131 

# Chapter 6: Infrastructure

In the United States, the availability, reliability and price of natural gas are inextricably linked to its production and delivery infrastructure. As seen in Figure 6.1, major components of the system include inter-state and intra-state trans

mission pipelines, storage facilities, liquefied natural gas (LNG) regasification terminals and gas processing units, all of which establish the link between gas producers and consumers. This system is both mature and robust. This chapter will describe and discuss:

s 4RENDS WITH IMPLICATIONS FOR THE 53 NATURAL

gas infrastructure;

s 4HE COMPONENTS AND SUB
SECTORS COMPRISING

the natural gas infrastructure, with a focus on pipelines, LNG import terminals, processing and storage;

s .EW AND PROPOSED ENVIRONMENTAL REGULATIONS

affecting the natural gas infrastructure; and

s 3PECIlC GAS INFRASTRUCTURE ISSUES ASSOCIATED

with the development of the Marcellus shale.

Figure 6.1 Schematic of the U.S. Natural Gas Infrastructure

Image modified from CHK132 MIT S T UDY ON T HE FU T URE O F N A T URAL GA S TRENDS AFFEC T ING U. S
. NATU R A L GA S I NFR A S T R U C TU RE
Several trends are altering the landscape of U.S. gas markets with implications for infrastructure needs and requirements. These include: chang

ing production profiles; shifts in demand/ consumption patterns; and the growth of LNG markets.
Changing Production Profiles
As described in Chapter 2, production from large onshore shale basins is shifting the focus of U.S. production from the Central and Western Gulf of Mexico (GOM), where it has been for the last two decades, back to onshore regions. While GOM production declined by 42% between 2004 and 2008, onshore produc

tion in the lower 48 states (L-48) increased by 22% over the same time period. 1
Areas with the most marked production increases include the relatively immature Rocky Mountains, where production increased 103% between 1998 and 2007; and parts of Eastern Texas, where production increased by 177% over the same time period. This shift is expected to be more pronounced as production increases from the Marcellus shale, concen

trated in New York and Pennsylvania, with additional production potential in Ohio and West Virginia.

Shifts in Demand Patterns
There has also been a shift in U.S. gas demand patterns over the last decades, associated in part with relative population shifts to the South and West from the Northeast and Midwest, the two regions in the country where population as a percent of total U.S. population has declined. Population growth has been especially pro

nounced in the Western U.S., where the popula

tion increased by 42% between 1980 and 2008. This growth, coupled with stricter air quality regulations, has led to increased demand for gas in the West, where gas consumption has outpaced population growth, increasing by 68% in the last three decades. In the Northeast, environmental concerns and a shift away from oil in power generation and home heating has led to increased gas consumption; between 1980 and 2008 the population in the Northeast U.S. increased by 19% but gas consumption increased by 50%. 2
These demand increases, largely for residential, commercial and electricity uses, have been accompanied by a reduction in demand from industrial customers; this is illustrated by the relative decline in gas consumption in the Southwest U.S., largely Texas, the only region of the country where gas consumption in absolute terms and as a percentage of the U.S. total actually dropped. This 15% decline in consump

tion over the last three decades can be attributed in part to high natural gas prices over the last several years which drove refineries, and ammo

nia and other chemical plants offshore. 3

The U.S. and LNG Markets
Growing gas demand and significant differ

ences in gas prices between global regions has increased the desirability of a global gas market. As seen in Chapter 3, gas prices are significantly lower under an Emissions Prediction and Policy Analysis (EPPA) scenario where there is a relatively unconstrained global market in natural gas compared to the current regionalized market. While the U.S. represents around 24% of global gas consumption, its engagement in the development of a global LNG market is tempered by dramatic increases in the U.S. producible gas resource base, largely enabled by the affordable production of new unconven

tional gas resources.Chapter 6: Infrastructure 133 Currently, the U.S. permits proprietary access to LNG suppliers for new regasification termi

nals; this would allow the developer of a regasification facility to give preference to the import of its own LNG or the LNG of its affiliates at that point of entry. 4 This policy decision was made to incentivize construction of substantial import infrastructure in the U.S. creating opportunites for increased global LNG trade.

G H G E MISSIONS FROM TH E NATU R A L GA S I NFR A S T R U C TU RE
Natural gas is the cleanest burning fossil fuel, enhancing its desirability as a fuel option in a carbon-constrained environment. As a fossil fuel, however, natural gas also emits greenhouse gases (GHG), including CO 2 emissions from gas combustion and CO 2 and methane emis

sions from the gas system, including produc

tion, processing, transmission and distribution.
According to EPA inventories released in 2010, in 2008 GHG emissions from natural gas systems were 126 teragrams (one teragram is equivalent to one million metric tons) of CO 2 equivalents (CO 2 e), less than 2% of total CO 2 equivalent emissions from energy sources and activities. Of this total, 96 teragrams of CO 2 e were CH 4 emissions; the remainder are from non-combustion CO 2 . The draft EPA inventory, released in late February 2011, doubled the EPA’s estimates of methane emissions from gas systems for 2008. A breakout of EPA’s estimated emissions from gas systems is seen in Figure 6.2 (from EPA’s revised draft inventory estimates also discussed in Appendix 1A).
Methane leaks from gas systems, particularly at the levels indicated by the new EPA estimates, could prompt efforts to capture those emissions for both environmental and business reasons. Reducing emissions from well completions can, for example, create value for producers and can have a very short payback period (3 to 8 months). 5 While many larger producers and pipelines have already deployed relatively inexpensive methane detection and capture technologies and are able to realize profits from use of these technologies, smaller producers may need new, more affordable technologies to detect and capture methane emissions.

The EPA has also issued a final rule on manda

tory reporting of GHG emissions from natural gas systems, after the Supreme Court deter

mined the EPA could regulate GHGs as air

Reduced Use
Gas CCS
Coal CCS
Renew Hydro
Nuclear
Gas
Oil
Coal Field Production 134.2 Transmission and Storage 43.4

Processing 37.1

Electric Power Industrial Commercial
Vehicles Lease, Plant and Pipeline Residential Distribution 29.9 Figure 6.2 Estimated CO 2 e Emissions from Natural Gas Systems

Source: EPA Draft GHG Emissions134 MIT S T UDY ON T HE FU T URE O F N A T URAL GA S pollutants and the EPA issued an endangerment rule in 2010, indicating that GHGs posed a threat to public health and welfare. This rule would require reporting from well pad equip

ment both onshore and offshore, gas process

ing, pipelines, city gates, LNG import and export facilities, underground storage and compressor stations. The rule covers annual reporting of CO 2 , methane, and nitrous oxide emissions from facilities emitting 25,000 metric tons of CO 2 e per year or more. The EPA estimates the cost to the industry of imple

menting the rule to be $61 million for natural gas and oil systems (the EPA does not separate gas from oil) and $20 million a year in subse

quent years in 2006 dollars.

The EPA has deferred direct emitter identifica

tion until confidentiality issues can be resolved. All other elements of the rule are now in effect. 6 The EPA estimates that this will affect around 2,800 facilities. The EPA is careful to point out that the 25,000 metric ton limit will exclude small businesses from the requirements of the rule. It is unclear how many small producers would be exempt by the emissions limit. Although the EPA recently postponed deadlines for mandatory emissions reporting, the ultimate regulation of GHGs by the EPA implied in the promulgation of this rule could have major impacts on gas system operations, particularly on production, transmission and storage, if the estimates in Figure 6.2 are reasonably accurate. EPA recently extended the deadline for applica

tion of best available monitoring methods for gas systems.

C OMPONEN T S OF TH E NATU R A L GA S I NFR A S T R U C TU RE
To move gas from production to demand centers over the next 20 years, it is estimated by the Interstate Natural Gas Association of American (INGAA) that the U.S. and Canada will need approximately 28,900 to 61,900 miles of additional transmission and distribution natural gas pipelines depending on assump

tions for gas demand — its base case identifies almost 38,000 miles of pipelines with the regional distribution depicted in Figure 6.3. 7 INGAA also projects a need for 371 to 598 billion cubic feet (Bcf) of additional storage capacity, a 15% to 20% increase over current levels and consistent with the rate of additions between 2005 and 2008. 8

Reduced Use
Gas CCS
Coal CCS
Renew Hydro
Nuclear
Gas
Oil
Coal Canada, 4.7

Southwest, 8.6

Central, 8.4 Midwest, 3.3

Electric Power Industrial Commercial
Vehicles Lease, Plant and Pipeline Residential

West, 2.2

Northeast, 2.7 Arctic, 1.0

Southeast, 4.6 O ! shore, 2.2 Figure 6.3 U.S./Canada Pipeline Capacity Additions, 2009–2030 (in 1,000 of miles)

Source: INGAA, 2009Chapter 6: Infrastructure 135 There will also be additional requirements for gas processing, especially in light of the changes in production patterns in the U.S. Investment requirements by sector for gas infrastructure between now and 2030 are summarized in Table 6.1. 9 Note that these figures assume success in bringing arctic gas to the L-48 from Alaska and the Mackenzie delta; the Alaska gas pipeline has remained illusory for the last two decades and its realization remains uncertain.
There are several federal and state agencies involved in siting gas pipelines and other gas infrastructure. The Federal Energy Regulatory Commission (FERC) regulates interstate pipe

line construction while states regulate intra-state pipeline construction. Other federal agencies play significant roles in construction permitting, including the EPA, the Fish and Wildlife Service, and the Office of Pipeline Safety (OPS) at the Department of Transportation (DOT); the OPS regulates the safety of pipeline operations over the infrastructure’s lifespan, starting with up-front safety certifications for permitting by FERC. The EPA ensures that a pipeline develop

ment project meets federal environmental guidelines. The Coast Guard and Maritime Administration (MARAD) at the Department of Homeland Security have responsibility for offshore LNG facilities. In addition to these federal agencies, there is a range of state entities involved in the permitting process.
The long lead times required to site and build gas infrastructure, driven in part by these complex regulatory decision-making structures for gas infrastructure siting, not only add to the cost, but mean that many of the additions and expansions we are seeing today were originally contemplated as much as a decade ago. This highlights the ongoing tension between the needs of policy makers and regulators for more accurate data and information on supply and demand trends and patterns, the associated infrastructure needs, and the status of technol

ogy development; and the inherent uncertain

ties and risks that accompany investment in natural gas infrastructure across the supply chain. Table 6.1 Total Expected Gas Pipeline, Midstream and LNG Expenditures, 2009–2030 (billions $)

Source: INGAA, 2009 Region Transmission Storage Gathering Processing LNG Total % Canada 33.0 0.4 1.2 1.0

- 35.5 17 Arctic 24

- 1.0 3.5

- 25.5 14 Southwest 27.6 1.3 4.2 7.5 0.4 41.1 20 Central 24.8 0.2 0.7 4.8

- 30.5 15 Southeast 15.4 1.4 0.4 2.3 1.3 20.8 10 Northeast 10.1 1.0 2.3 1.6

- 15.1 7 Midwest 12.9 0.4 0.2

- - 13.4 6 Western 8.7 0.5 0.1 1.0

- 10.4 5 O ff shore 6.3

- 7.8

- - 14.1 7 Total 162.8 5.2 18.0 21.7 1.8 209.5 100 Percentage 78 2 9 10 1.0 100136 MIT S T UDY ON T HE FU T URE O F N A T URAL GA S The U.S. Natural Gas Pipeline Network
The U.S. natural gas pipeline network includes:

s 'ATHERING PIPELINES AT OR ADJACENT TO

production sites;

s )NTER
STATE AND INTRA
STATE TRANSMISSION

pipelines which move processed gas over long distances from production sites to major centers of demand; and

s 3MALLER DIAMETER DISTRIBUTION PIPELINES

which carry natural gas on to end users.

In this discussion, we focus largely on transmis

sion pipelines additions, although safety, which is briefly discussed, is also an important issue for distribution pipelines and to some degree, for gathering pipelines as well.
Pipeline Additions. Major changes in U.S. gas markets have prompted significant additions to the country’s pipeline network over the last several years. Between 2005 and 2008, for example, pipeline capacity additions totaled over 80 billion cubic feet per day (Bcfd), exceeding those from the previous four-year period by almost 100%. Additions of 44.5 Bcfd in 2008 alone exceeded total additions in the five-year period between 1998 and 2002. The rate of additions in 2009, while slower than in the previous several years, was still brisk with 3,000 miles of pipelines added. Figure 6.4 10 highlights major inter-state pipeline additions over the 11-year period from 1998 to 2008. The largest single addition to the pipeline system between 2005 and 2008 was the Rocky Mountain Express pipeline (REX) with a capacity of 1.8 Bcfd. This pipeline has effectively linked Western producer markets to Eastern consumer markets. Other notable additions include Gulf Crossing (1.4 Bcfd) and Midcontinent Express (1.2 Bcfd), both taking gas from the shale regions in Texas and Oklahoma to Alabama and Mississippi; and two expansions to move gas into the Southeast U.S., the 1.6 Bcfd Gulf South Southeast Expansion; and the 1 Bcfd Southeast Supply header. 11
The largest regional capacity increase in this time frame was from the Southwest region to the Southeast, where almost 6.7 Bcfd of pipe

line capacity was added, in part to move shale supplies to markets. Capacity to move supply from the Midwest to the Northeast increased by 1.5 Bcfd, a 30% jump, followed by exports from the Central to Western U.S., at 1.4 Bcfd.
West-to-East expansions are contributing to major changes in the general direction of pipeline flows in the U.S., which have histori

cally moved from south to north. 2030 forecasts suggest the need for an additional 20% of interregional transport capacity. 12 While forecasts and historical pipeline expansions offer a portrait of a robust and adequate response to growth in gas demand, the poten

tial for large increases in gas-fired power generation, either for fuel substitution from gas to coal or as firming power for intermittent renewable generation, could increase the need for gas pipeline infrastructure.
Figure 6.4 depicts total pipeline capacity and directional flows; the circled areas highlight additions between 1998 and 2008, with volumes added and directions indicated by the key in the lower right-hand corner. 

## Major changes in U.S. gas markets have prompted significant additions to the U.S. pipeline network over the last several years. Between 2005 and 2008, pipeline capacity additions totaled over 80 Bcfd, exceeding those from the previous four-year period by almost 100%.Chapter 6: Infrastructure 137 In Chapter 4 we discuss the need for increased gas peaking units to firm intermittent renew

able generation even though their capacity factors would most likely be very low. Similarly, recent analysis by the INGAA Foundation suggests that in the event of large-scale penetra

tion of intermittent renewable generation, gas pipelines may need to dedicate firm capacity to provide service to backup generators even though this capacity would be used infre

quently and the per-unit cost of the infrastruc

ture is likely to be very high. 13 The INGAA study also forecasts an incremental delivery capacity requirement of around 5 Bcfd of gas for new firming generation though utilization would be only around 15%, with implied transportation costs that could be around six times more than full-rate utilization costs. 14 Pipeline Safety. Recent gas pipeline explosions in California and Pennsylvania, which caused loss of life and property, underscore pipeline safety as an ongoing issue. There is a range of reasons for pipeline accidents, from pipeline/ construction defects to third-party accidents to corrosion. Figure 6.5 shows the number of incidents by type of pipeline over the last 20 years. According to statistics compiled by the DOT, corrosion is the most common cause of leakage for transmission pipelines, and third-party excavation incidents are the most common cause of leakage for distribution pipelines. 15 Leakage is responsible for most serious incidents.
The DOT’s Pipeline and Hazardous Materials Safety Administration (PHMSA) has the pri

mary federal responsibility for ensuring gas pipeline safety. In 2003, the PHMSA imple

mented a rule that required an integrity management program (IMP) for transmission Figure 6.4 Major Additions to Natural Gas Transportation Capacity 1998–2008

Source: Presentation of James Tobin, EIA, Major Changes in Natural Gas Transportation Capacity, 1998–2008, November, 2011.



## West-to-East expansions are contributing to major changes in the general direction of pipeline flows in the U.S.138 MIT S T UDY ON T HE FU T URE O F N A T URAL GA S pipelines. This rule required operators to test transmission pipeline integrity in highly populated areas by 2012. Between 2003 and 2009, after the implementation of the rule, there were six total fatalities; tragically, there were 10 fatalities in 2010 from the explosion and fire in San Bruno, California.
As noted, distribution pipelines are responsible for the largest number of serious gas pipeline safety incidents. Distribution pipelines also pose more difficult problems for integrity management compared to transmission pipelines as they are much smaller in diameter, are shorter, include a significant amount of plastic pipe, and have major branching of pipes to serve end use customers. A PHMSA rule for distribution pipelines, which went into effect in February 2010, requires IMPs to be implemented by August 2011. While plans are required, they will reflect the different challenges of distribution pipeline safety compared to transmission pipelines; they will likely be less prescriptive and will also cover the operator’s entire area, compared to the requirements for transmission pipelines to cover only “high consequence areas.”

The DOT has noted the lack of incentives for distribution pipeline operators to assess the safety of distribution pipelines, writing that “...there are no robust market signals or incentives to prompt operators to thoroughly assess the condition of the pipelines or to implement integrity management programs.” 16 Also, according to the U.S. Department of Energy’s (DOE) Office of Fossil Energy almost one-quarter of U.S. gas pipelines are more than 50 years old. 17 In addition, demand for natural gas is expected to increase over the next couple of decades.
Finally, existing pipeline safety research pro

grams within the federal government are small and the task of ensuring the integrity of the 306,000 miles of transmission pipelines and 1.2 million miles of distribution pipelines is both large and essential. The PHMSA identifies $33.25 million in federal funding for pipeline Reduced Use
Gas CCS
Coal CCS
Renew Hydro
Nuclear
Gas
Oil
Coal Gathering, 10 Transmission, 132

Electric Power Industrial Commercial
Vehicles Lease, Plant and Pipeline Residential Distribution, 830 Figure 6.5 Serious Gas Pipeline Incidents by Pipeline Type, 1991–2010

Source: PHMSA



## Existing pipeline safety research programs within the federal government and within industry are small and the task of ensuring the integrity of the 306,000 miles of transmission pipelines and 1.2 million miles of distribution pipelines is enormous and essential.Chapter 6: Infrastructure 139 safety technology development since 2002, around $4 million per year (Table 6.2). The PMHSA also identifies $16.94 million in “strengthening standards” research and $29.98 million in “knowledge document” research; the last two categories could be characterized as “regulator’s science.”
IMPs are necessary but may not be sufficient to meet safety needs. The gas industry noted the need for additional transmission and distribu

tion R&D in a 2007 report. 18 Specific focus areas could include:

s )MPROVING THE MONITORING AND ASSESSMENT

of system integrity;

s %NHANCING SYSTEM mEXIBILITY AND THROUGHPUT

and reliability;

s 2EDUCING THE INCIDENCE AND COST OF SUBSURFACE

damage;

s )MPROVING THE CAPABILITY OF COST
EFFECTIVE

construction, maintenance and repair; and

s )MPROVING DATA QUALITY AND TIMELINESS FOR

system, operation, planning and regulatory acceptance and mitigating environmental issues. 19 Pipelines and Regional Prices. With respect to pipelines and regional prices, in general, the difference between daily prices at regional hubs compared to Henry Hub prices (the market center in Louisiana that serves as the price point for New York Mercantile Exchange (NYMEX) futures contract) is the basis differ

ential or “basis.” The basis differentials are often small, reflecting the short-run variable cost of transporting gas or of displacing shipments of gas to one market center instead of another. Occasionally, when transportation bottlenecks are long term, the basis differentials become large and reflect the different prices at which demand is being rationed in the different locations.
A differential that greatly exceeds the cost of transportation suggests system bottlenecks. According to FERC, Rockies tight gas and Marcellus shale will compete with traditional supplies from the Gulf of Mexico. FERC anticipates that this new supply will help moderate severe basis spikes on peak demand days in the winter. 20 Source: PHMSA Web site

Category PHMSA Industry Total Damage Prevention $2.79 $2.33 $5.12 Pipeline Assessment and Leak Detection $25.08 $32.77 $57.86

Defect Characterization and Mitigation $0.80 $1.20 $2.00

Improved Design, Construction and Materials $4.58 $5.40 $9.98

Grand Totals: $33.25 $39.37 $72.62 Table 6.2 PHMSA Technology Research 2002–present (in millions of $)140 MIT S T UDY ON T HE FU T URE O F N A T URAL GA S The relationship of the price differential to infrastructure is observed in the basis differen

tials at the Cheyenne and Algonquin hubs before and after the opening of the REX pipe

line, which is now moving gas supplies from the region to Eastern markets (Figure 6.6). These fairly dramatic changes demonstrate how alleviating pipeline infrastructure bottlenecks can incentivize production and lower consumer prices overall.

Before the construction of the REX pipeline, natural gas transportation out of the Rockies region was very constrained, leading to lower gas prices than those at most of the other natural gas market centers. As of November 2009, REX had the capacity to move 1.8 Bcfd of natural gas from the Rockies to Ohio, then to the Northeast. As noted, REX was the largest addition in the U.S. pipeline system between 2005 and 2008 and has effectively joined Western producer markets with eastern con

sumer markets, a long-time goal of Rocky Mountain producers. This pipeline has had a major impact on gas flows in the Midwest and has reduced the basis differential at both the Algonquin and Cheyenne hubs.
Natural Gas Processing
Each year in the U.S. some 530 natural gas processing plants process around 16 trillion cubic feet (Tcf) of raw natural gas. These facilities have an average capacity factor of around 68%. Natural gas often requires pro

cessing because gas in its raw form can contain impurities which may include sulfur, CO 2 , water 

## ...alleviating pipeline infrastructure bottlenecks can incentivize production and lower consumer prices overall.

Figure 6.6 Impacts of 2008 Pipeline Capacity Expansion on Regional Prices and Average Basis

Source: Bentek, Beast in the East, 2010Chapter 6: Infrastructure 141 and other contaminants that need to be removed before transport through pipelines to demand centers. Removing impurities such as sulfur, CO 2 and water to produce pipeline-quality gas is the primary role of such processing facilities. 21 Understandably, gas processing units are largely located in gas-producing regions of the country. Currently, around 82% of gas-processing capacity is in six states: Louisiana, Texas, Wyoming, Kansas, New Mexico and Oklahoma.
As noted, gas production is increasing dramati

cally and production patterns in the U.S. are changing. The need for gas processing additions is likely to be more pronounced in regions where gas production is relatively immature, such as in the Uinta Basin of Eastern Utah and the Piceance Basin of Western Colorado. Gas processing is very limited in the Marcellus Shale Basin where, for example, Western Pennsylvania and Northern West Virginia combined have 530 million cubic feet (Mmcf) of processing capacity, with 435 Mmcf of planned processing additions and a new 37,000 bpd fractionation plant. 22
Gas processing units also produce natural gas liquids (NGLs) from heavier hydrocarbons contained in unprocessed “wet” gas. If there are sufficient quantities of NGLs, the market conditions are right, and the processing facility has the capacity to both treat and separate NGLs from gas streams, consumer products can be produced, including ethane, propane, butane and pentanes. These products can add value for gas producers, especially important in a low gas price environment. In 2009, the U.S. gas industry produced 714 million barrels of NGLs, a 16% increase over the 2005 levels of production.
Natural Gas Storage
Natural gas is stored in underground storage facilities to help meet seasonal demand fluctua

tions, accommodate supply disruptions and provide operational flexibility for the gas system, including power plants. Gas storage is also used to hedge price variations.
There are around 400 storage facilities in the L-48 owned by 80 corporate entities and managed by 120 operators. Depleted reservoirs account for most storage facilities (82%), followed by aquifers (9%), with salt caverns making up the remainder. Working gas storage capacity nationwide in 2009 was around 4.2 Tcf, which represents about 20% of annual gas production. Over 53% of this capacity is found in just five states: Michigan, Illinois, Louisiana, Pennsylvania and Texas. 23
There has been a great deal of interest in the relationship between storage and short-term price volatility. In 2005, the FERC chairman noted that gas storage capacity had increased only 1.4% in almost two decades, while U.S. natural gas demand had risen by 24% over the same period, and speculated that there was a link to the record levels of price volatility that were being experienced. 24 In 2006, FERC issued Order 678 which, among other things, sought to incentivize the building of more storage by changing its regulations on market power requirements for underground storage. Since the order was issued, total storage capacity has increased by 169 Bcf, or 2% of overall storage capacity. This compares to a 1% increase in the previous three-year period.
There is also growing interest in high-deliver

ability gas storage. Storage facilities are classified as either baseload or peakload facilities. Baseload storage facilities, most often in depleted reservoirs, typically support long-term seasonal requirements primarily for commercial, residen

tial and industrial customers. These facilities are large and are designed to provide steady supply over long periods of time; their injections (typically over 214 days, April to Oct) and withdrawals (151 days, Nov to Mar) are slow. 25142 MIT S T UDY ON T HE FU T URE O F N A T URAL GA S The operational characteristics of baseload storage may be inadequate as storage needed for gas-fired power generation where gas demand varies greatly, not just by season but daily and hourly. Managing this variability is especially important, for example, when, as seen under the carbon price scenario in Chapter 2, natural gas becomes a more critical component of the generation mix. Also, gas peaking units serve as backup for intermittent renewables which may have relatively low load. This type of demand also requires greater variability in storage with

drawals than is found in baseload storage units.
High-deliverability storage provides an option for handling high-demand variability associated with an increased role or natural gas in power generation. 26 High-deliverability storage, typically in salt caverns, is only about 5% of overall gas storage, although capacity increased 36% between 2005 and 2008, compared to 3% for all gas storage. 27 More important than capacity, however, is the withdrawal period.Table 6.3 highlights the much shorter, multicycle capabilities of salt formation storage facilities compared to depleted reservoirs and aquifer storage. 28
Salt caverns are typically located in the Gulf Coast region and are not found in many areas of increased gas demand, where geology limits both baseload and peakload storage options; this is particularly true in the Northeast, the West (areas of high gas demand for power generation) and parts of the desert Southwest.
The growing use of natural gas for power generation, including the potential near-term displacement of coal with Natural Gas Com

bined Cycle ( NGCC) generation and increased penetration of intermittent renewables, dis

cussed in detail in Chapter 4, underscores the growing interdependencies of the gas and electric infrastructures. This growing relation

ship between gas and power infrastructures ishighlighted by the increased need for highdeliverability gas storage to match the growth in gas-fired power generation. The degree to which this interdependency stresses both the gas and power infrastructures and creates conditions where the infrastructures and related contracting, legal and regulatory structures may be inadequate is not fully understood. 

## [The] growing relationship between the gas and power infrastructures is highlighted by the increased need for high-deliverability gas storage to match the growth in gas-fired power generation associated with fuel. The degree to which this interdependency stresses both the gas and power infrastructures and creates conditions where the infrastructures and related contracting, legal and regulatory structures may be inadequate is not fully understood.

Table 6.3 Gas Storage Facility Operations

Source: FERC Staff Report Type Cushion Gas Injection Period (Days) Withdrawal Period (Days) Depleted Reservoir 50% 200–250 100–150 Aquifer Reservoir 50%–80% 200–250 100–150 Salt Cavern 20%–30% 20–40 10–20Chapter 6: Infrastructure 143 RECOMMENDA T ION A detailed analysis of the growing interdependencies of the natural gas and power generation infrastructures should be conducted. This should include analysis of the system impacts of increased use of natural gas for power generation and the degree to which this stresses the infrastructure or creates conditions where storage may be inadequate to meet power generation needs.

LNG Infrastructure
LNG regasification terminals are the last link in a long supply chain that enables international trade in natural gas and U.S. LNG imports. In 2000, the U.S. had four LNG regasification facilities with a combined capacity of 2.3 Bcfd. 29 High natural gas prices in the first decade of the 21st century, coupled with concerns about declines in domestic supplies and reserves, sparked a wave of construction of new LNG regasification terminals and expansions of existing ones. North America now has 22.8 Bcfd of LNG regasification-rated capacity either operating or under construction (with original planning expectations of capacity factors of around 50%), 89% of which is in the U.S.
These facilities are expensive. The EIA esti

mated in 2003 that a typical new regasification terminal would cost $200 to $300 million for a sendout capacity from 183 to 365 Bcf (3.8 to 7.7 million tons) per year of natural gas but acknowledged a wide variation in cost, which is very site specific. 30
In 2009, U.S. consumption of imported LNG was 1.2 Bcfd, leaving most of this new capacity unused and the investment stranded. Demand is, however, geographically uneven. The Everett import facility in Boston, for example, meets around half of New England’s gas demand. Gulf Coast terminals however have been forced to seek authorization to re-export gas. 31 On a positive note, the large excess of import capac

ity provides options for supply diversity in the event of unexpected shortfalls in indigenous supply. Also, LNG supplies initially intended for U.S. markets have been diverted to other countries, with European importers and consumers, including some key U.S. allies, as the main beneficiaries.
Federal Policy and LNG. During the last decade, federal policy facilitated the expansion of LNG import capacity. In 2002, as already noted, FERC issued the so-called Hackberry decision which aided investment in LNG import capacity by allowing LNG developers proprietary access to import facilities. To address delays in LNG import terminal siting associated with jurisdictional conflicts, the Energy Policy Act of 2005 granted FERC exclusive jurisdiction over permitting of onshore LNG regasification facilities, clarifying federal primacy in this process. Later that year, FERC, in an effort to expedite siting of LNG facilities, established mandatory pre-filing procedures designed to help resolve NEPA and other community issues prior to the filing of a formal application with FERC by the developer to site a regasification facility. 32 These statutory and regulatory actions helped enable the permitting of substantial additional regasifica

tion capacity in the U.S. Together with addi

tional volumes from Canada and Mexico, 48.65 Bcfd was licensed to supply U.S. markets (but not all of this capacity was built).
These actions by FERC and other agencies illustrate a willingness on the part of the federal government to expedite the building of energy infrastructure in order to achieve a policy objective; in this instance, adequate and afford

able supplies of natural gas were deemed to be in the public interest as it was widely believed at the time that North American gas production had peaked and that imports would be neces

sary to affordably meet demand.144 MIT S T UDY ON T HE FU T URE O F N A T URAL GA S This unused capacity has prompted facility owners and investors to explore opportunities for using them as export as well as import terminals; this would require the building of substantial new liquefaction infrastructure. Cheniere, the owner of the Sabine regasification facility for example, has entered into non-bind

ing agreements with two potential purchasers of LNG volumes, and is seeking funding to build four LNG trains at the site. The U.S. DOE recently approved a permit for export of LNG from this project to free trade agreement countries only and FERC has initiated an environmental review of the proposal. Others such as Dominion at Cove Point are reviewing export opportunities as well.

I NFR A S T R U C TU RE N EEDS A ND TH E D EVELOPMEN T OF TH E MA RCELL U S SHA LE
As noted in Chapter 2, the natural gas produc

tion profile of the U.S. has been altered by the ability to produce natural gas from large U.S. shale basins. The Marcellus shale may be the largest contiguous shale basin in the world, underlying significant acreage in New York, Ohio, Pennsylvania and West Virginia, but it is also the least developed of major U.S. shale basins. These Northeastern and Midwestern states are generally more densely populated and less accustomed to natural gas production than Texas, Oklahoma, Arkansas and Louisiana, the locations of other major producing shale basins. Production in these other basins will continue to alter U.S. gas supply forecasts regardless of the development of the Marcellus. Its sheer size, its under-development, its unique environmental issues and its proximity to major demand centers and the associated consumer benefits warrants a brief discussion of some key infrastructure issues affecting the development of the Marcellus.
The economics of shale production and the size of the Marcellus shale basin have created enormous interest in the development and production of this vast resource. The location of Marcellus production in the Northeast, with the resulting lower transportation costs to this market, could translate into lower gas prices for the region’s consumers, who have typically relied on LNG imports, and Canadian and GOM gas via pipeline.

Figure 6.7 Average Transportation Costs to Northeast Markets ($ per Mmcf)

Source: Bentek, Beast in the East, 2010 0.50

0.40

0.30

0.20

0.10

0.00 0.21 0.41 611 0.42
0.37



### Million Barrels Marcellus Southeast/Gulf Canada RockiesChapter 6: Infrastructure 145 It could also shift GOM gas movements to the southeast, an attractive option for theregion’s consumers who are on the highpriced end of the Western coal supply chain. Figure 6.7 shows the average and typical transportation costs for producing regions supplying Northeast markets. 33

The Marcellus, however, needs substantial infrastructure additions to move its gas to markets. There are three transmission pipe

lines to serve the region either under con

struction or certified for construction with a combined capacity of over 1 Bcfd, and another 4.8 Bcfd of planned additions to existing pipelines. These additions are essen

tial: Marcellus producers estimated that, as of early 2010, less than half of the 1,100 wells drilled in the Pennsylvania Marcellus had pipeline access. 34
It is expected that planned investments in pipelines, which are in the several billion dollar range, will also drive investments in under

ground storage. This is critical for the region as the geology of the Northeast precludes signifi

cant storage in this key demand region, which could create a storage bottleneck when moving gas from points West to Northeastern markets, particularly in the peak demand months in the winter.
There is also wet gas in the Marcellus, particu

larly in Southwestern Pennsylvania. The condensate and NGLs from wet gas enhance the economics of production, assuming favor

able market conditions and adequate infra

structure to move NGL products to markets. A significant percentage of this wet gas in the Marcellus requires processing to provide pipeline quality gas. The shortage of processing capacity and outlets for wet gas products could place constraints on the production of pipeline quality gas, and could effectively shut-in significant gas production in the Marcellus. If all planned gas processing capacity additions for the Marcellus were to come on-line, on schedule, the region would have 800 million cubic feet per day (Mmcfd) of gas processing capacity by 2012. Also, two NGL pipeline projects have been proposed from Pennsylvania to Chicago and Ontario which could ease the pressure for NGL outlets. Planned pipeline expansions appear to be adequate.

Finally, of major interest and concern is the development of a water disposal infrastructure to mitigate the environmental impacts associ

ated with wastewater from drilling which includes flowback water and produced water. Water disposal options in the Marcellus are limited. Strict regulations and complicated geology, particularly in Northeast Pennsylvania, limit the development of disposal wells close todrilling sites. There is extremely limited pretreatment capacity in the region and the climate is not conducive to evaporation options. Minimizing flowback water, on-site treatment options, water reuse, and new local and regional water treatment facilities are needed to reduce the environmental impacts of flowback and produced water and water transport. 

## Minimizing flowback water, on-site treatment options, water re-use, and new local and regional water treatment facilities are all necessary in managing the environmental impacts of flowback and produced water, water transport, and the stress on existing water treatment facilities in the region.146 MIT S T UDY ON T HE FU T URE O F N A T URAL GA S N O T ES

1 EIA, Table 5a, U.S. Gas Supply, Consumption and Inventories.

2 EIA, U.S. Census data.

3 Bernstein Research report, Natural Gas: Method in the Madness, February, 2009.

4 CRS Report, Liquefied Natural Gas (LNG) in U.S. Energy Policy: Issues and Implications, May 2004, the so-called “Hackberry decision”, “...allowed terminal developers to secure proprietary terminal access for corporate affiliates with investments in LNG supply.” Terminals that existed at the time of the ruling in 2002 were exempted. Congress codified Hackberry in the 2005 Energy Policy Act.

5 EPA Methane to Markets presentation, International Workshop on Methane Emissions Reduction Technologies in the Oil and Gas Industry, Lake Louise, 14-16 September 2009.

6 See EPA Web site, Petroleum and Natural Gas Greenhouse Gas (GHG) Reporting Rule (40 CFR Part 98 ), EPA Climate Change Division.

7 http://www.ingaa.org/cms/15.aspx, Dec 17 2009, 38,000 is base case for gas demand.

8 http://www.ingaa.org/cms/15.aspx, Dec 17 2009, ranges represent high and low cases in forecasts.

9 Ibid, high gas demand case.

10 November 2008, Presentation of James Tobin, EIA,

Major Changes in Natural Gas Transportation Capacity, 1998–2008.

11 Bentek, The Beast in the East: Energy Market

Fundamentals Report, March 19th, 2010.

12 Ibid.

13 INGAA Foundation study, Firming Renewable

Electric power Generators: Opportunities and Challenges for Natural Gas Pipeline , March 16, 2011.

14 Ibid.

15 Serious incident is defined on PHMSA Web site as

an event involving a fatality or injury requiring hospitalization.

16 PHMSA-Research and Special Programs

Administration, U.S. Department of Transportation Web site, 2004-19854.

17 See DOE Fossil of Energy Web site, Transmission,

Storage and Distribution program description , as of January 23, 2009. 18 American Natural Gas Foundation study, Research and Development in Natural Gas Transmission and Distribution , March 2007.

19 Ibid.

20 FERC Northeast Natural Gas Market, Overview

and Focal Points.

21 EIA report, Natural Gas Processing: the Crucial

Link Between Natural Gas Production and Its Transportation Market, January, 2006.

22 Bentek, The Beast in the East: Energy Market

Fundamentals Report, March 19th, 2010.

23 EIA Table 14, Underground Storage Capacity by

State, December 2009.

24 December 15, 2005, Statement by FERC chairman

Joe Kelliher on the Notice of Proposed Rulemaking Announcement on Natural Gas Storage Pricing Reform.

25 FERC Staff Report, Current State of and Issues

Concerning Underground Natural Gas Storage , 2004.

26 INGAA Foundation Web site notes that,

“additional conventional storage will be needed to meet growing seasonal demands and high deliverability storage will be required to serve fluctuating daily and hourly power plant loads.”

27 EIA, Table Underground Natural Gas Storage by

Storage Type.

28 FERC Staff Report, Current State of and Issues

Concerning Underground Gas Storage , 2004.

29 Gas Technology Institute, LNG Sourcebook, 2004.

30 EIA Report #:DOE/EIA-0637, December 2003.

31 FERC report, State of the Markets , 2009.

32 FERC order 665’s discussion of pre-filing

procedures noted that it is “desirable to maximizeearly public involvement to promote the widespread dissemination of information about proposed projects and to reduce the amount of time required to issue an environmental impact statement (EIS).”

33 Bentek, The Beast in the East: Energy Market

Fundamentals Report, March 19th, 2010.

34 Ibid.Chapter 7: Geopolitics 147 

# Chapter 7: Markets and Geopolitics

As we have seen in Chapter 3, there are substan

tial economic benefits to a global natural gas market. Geology, geography and historical market and geopolitical arrangements have, however, limited the development of a global market that links supply centers to major demand centers, which would have significant energy security ramifications.
At present, trade is centered in three distinct regional gas markets — North America, Europe (including Russia and North Africa) and Asia with links to the Persian Gulf (see Figure 3.11). Each has a different market structure resulting from the degree of market maturity, the sources of supply, the dependence on imports and other geographical and political factors. Importantly, these regional markets set natural gas prices in different ways. In general, the U.S. has gas-on-gas competition and open access to pipeline trans

portation, and manages risk through spot and derivatives markets. The European market relies more heavily on long-term contracts with price terms based on a mix of competing fuels, e.g., fuel oil, and pipeline access is restricted. Asia uses crude oil as a benchmark for natural gas prices and favors long-term contracts; this structure has kept LNG prices in Europe and Asia high relative to other regions. These market features, along with the availability of domestic natural gas resources and geopolitical interests, establish the boundary conditions for the development of global natural gas markets, at the same time that significant price disparities between regions create greater interest in such a market.
This regionalized and varied structure of natural gas markets stands in contrast to the global oil market, and it is instructive to understand the fundamentals of the difference between oil and natural gas markets. The physical characteristics of oil — a very high energy density at normal conditions of temperature and pressure — make it readily transportable over long distances, by a variety of means, at moderate cost. This has allowed the development over time of a global oil market, where multiple supply sources serve multiple markets at transparent spot prices, with price differences largely attributed to transporta

tion costs and oil quality. Notwithstanding dependence on imports, the diversity and robustness of this marketplace adds significantly to security of supply for consumers and to security of markets for producers.
In comparison, natural gas markets are smaller and less mature, and the physical characteristics of natural gas constrain transportation options. Unlike oil, transportation costs — whether for pipeline gas or liquefied natural gas (LNG) — constitute a significant fraction of the total delivered cost of natural gas. Also, because of the relative immaturity of natural gas markets, compared to oil, and the very high upfront capital costs, long-term contracts have been necessary to underwrite the cost of infrastruc

ture development and to ensure a market for the supplier.
Pipeline gas accounts for almost 80% of today’s interregional gas trade (a share that is expected to decline as the LNG trade grows). Pipelines may transit many countries. The number of parties involved in a multi-national pipeline project can slow project development consider

ably and political instability in host or transit nations raises security of supply issues. Also, cross-border pipelines must invariably comply with multiple and dissimilar legal and regulatory regimes, further complicating pipeline construc

tion and operations. Finally, the strong mutual interests of buyers and sellers in cross-border pipeline projects are not fully shared by transit nations, such as Ukraine for Russian supply to Western Europe.148 MIT S T UDY ON T HE FU T URE O F N A T URAL GA S 

## The U.S. natural gas market functions well, with infrastructure development more or less keeping pace with changing market needs. Pipelines have a distinct economic advantage over LNG for shorter distances but LNG gains advantage over longer distances and is a key enabler of a global gas market. LNG offers the

potential for a greater diversity of suppliers and markets, both key ingredients for increased reliability and energy security. Also, LNG is generally contracted between a single buyer and seller, simplifying contract negotiations and transport routes. However, the investment required for capacity expansions of each link in the LNG supply chain is considerable; since minimizing investment risk is a fundamental driver for developing global LNG markets, longer-term contracts are favored.
The geological realities of natural gas resources are similar to those of oil in terms of the degree of concentration of conventional resources, with Russia, Iran and Qatar having the largest conventional natural gas resource base (see Chapter 2). As with oil, at issue is the extent to which major resource holders, over time, will manipulate supply and prices to advance political and/or economic objectives in ways that are detrimental to the U.S. and its allies. Conse

quently, the future structure of these markets and the degree of integration that may develop have both economic and security implications. Several factors could lead to greater market integration and diversity of supply:

s THE COMPETITION FOR SUPPLY FROM REGIONS THAT

can serve multiple major markets, such as the Caspian;

s GROWTH IN ,.' TRADE AND THE DEVELOPMENT

of a market in which cargoes seek favorable prices, a trend that has been seen in the Atlantic basin; and s DEVELOPMENT OF MAJOR UNCONVENTIONAL GAS resources could diversify supply in strategic locations such as Europe and China, with mixed implications for market integration.
Of course, there are many unknowable factors that can impede market integration, including the geopolitical aims of current and future natural gas exporters.

MARKET STRUCTURES

The U.S. Market
The U.S. natural gas market is the most mature of the world’s three major regional markets. Significant exploitation of natural gas began in the latter half of the 19th century centered in Appalachia, with much larger production and consumption starting in the 1920s after discov

eries in the Southwest. This expansion was aided by advances in pipeline technology, eventually creating a continent-wide, integrated natural gas market.
The regulatory institutions governing the natural gas markets in the U.S. have undergone their own historical evolution. New Deal initiatives in the 1930s broke the control of the holding companies over local utilities and established the Federal Power Commission as a regulator of the interstate sale and shipment of natural gas. The Natural Gas Act of 1938 and its subsequent amendments provided federal eminent domain authority for the construction of new interstate natural gas pipelines and natural gas storage. These policies facilitated the robust growth of a continent-wide network.
Initially, long-term contracts were the rule. There was no single benchmark price for natural gas in the U.S. This changed with the passage of the Natural Gas Policy Act of 1978, which gradually led to the removal of price controls on the interstate sale of natural gas in the U.S. Starting in 1985, ceilings were removedChapter 7: Geopolitics 149 on the sale of new natural gas and the Federal Energy Regulatory Commission (FERC) issued a series of Orders between 1985 and 1993 that served to create an open and transparent continent-wide market in natural gas. This market-based focus was extended to natural gas storage in the Energy Policy Act of 2005.
A robust spot market has developed in the U.S. and Canada, with prices set by the forces of supply and demand. Contracts continue to play a role, albeit diminished, in the market, where price clauses typically reference the spot market. This expansion has been supported by an expanded pipeline network and associated midstream gas facilities. The U.S. natural gas market functions well, with infrastructure development more or less keeping pace with changing market needs (see Chapter 6).
At present, North America is largely selfsufficient in natural gas, and this situation is likely to continue for some time, as indicated in Chapter 3. The substantial surplus of LNG import capacity, discussed in Chapter 6, effectively provides backup capacity in the event of unanticipated supply shortfalls or high prices.
It should also be noted that the U.S. exports natural gas. LNG exports from Alaska to Japan have been in place for 40 years, but are likely to face additional competition in the Asian market, particularly as the Cook Inlet produc

tion tapers off. Part of this competition may come from Canada, which has a large shale gas resource. The Department of Energy (DOE) has approved an application to export LNG from a Gulf of Mexico (GOM) facility. The U.S. also exports natural gas by pipeline to Mexico and Canada, although with a significant net import from Canada. Especially since passage of the North American Free Trade Agreement (NAFTA), there has been increased North American energy market integration.
The large Canadian shale gas resource adds to the diversity of supply within the functioning North American market. U.S. Oil and Natural Gas Prices
There have been long-running discussions about the relationship between oil and natural gas prices; these have intensified as the ratio of oil to natural gas prices reached historic highs over the last year. This growing spread could have enormous implications for U.S. natural gas markets and is especially critical for gas producers, industrial gas users and the use of natural gas as a transportation fuel. For CNG or LNG vehicles, a low natural gas price relative to oil is essential for a reasonable payback period because the vehicle capital cost is appreciably higher (see Chapter 5). In this chapter, we explore the history of these prices and price movements in the U.S. market during the preceding decades.
Oil prices have hovered around $100/barrel (bbl) for much of the last year while the U.S. Henry Hub (HH) price has been consistently below $5/MMBtu, for a ratio at or above 20. (We caution the reader that this ratio involves two different quantities; it is normally stated in terms of the price for a barrel of oil, about 6 MMBtu, in relation to the price for a 1 MMBtu of natural gas because these are the benchmarks in commodity markets.) A common assump

tion is that opportunities for substituting oil for natural gas, and vice versa, will equilibrate the prices. A simple energy equivalency argument would pin the price of a barrel of oil at about six times the natural gas price, but this simple energy-equivalence argument is unlikely to be accurate because oil and natural gas undergo different processing, distribution and storage for different end uses. A number of “rules of thumb” have emerged. An empirical rule that is often invoked sets the crude oil/gas price ratio at 10. Others are based on the competition between natural gas and distillate fuel oil or between natural gas and residual fuel oil, using typical ratios of fuel oil and crude oil prices.150 MIT S T UDY ON T HE FU T URE O F N A T URAL GA S Figure 7.1 Log Values of the Natural Gas and Oil Spot Prices, 1991–2010 (2010 dollars)Log Natural Gas PriceLog Oil PriceJan-91Jan-92Jan-93Jan-94Jan-95Jan-96Jan-97Jan-98Jan-99Jan-00Jan-01Jan-02Jan-03Jan-04Jan-05Jan-06Jan-07Jan-08Jan-09Jan-10 Natural Gas Oil

0.0 0.5 1.0 1.5 2.0 2.5 3.0

2.0 2.5 3.0 3.5 4.0 4.5 5.0

Figure 7.1 shows the (natural) logarithm of the HH natural gas price and the West Texas Intermediate (WTI) crude oil price (the logarithms are used so that the same percentage change in price appears the same irrespective of the price) over the period 1991 to 2010. It is clear in Figure 7.1 that no simple rule of thumb can fully capture the relationship between the natural gas and oil prices. The natural gas price is approximately twice as volatile as the oil price, and short-run swings in both prices are overlayed on top of whatever long-run relation

ship may exist. A more detailed statistical analy

sis by Ramberg and Parsons confirms this point even after incorporating key exogenous factors affecting the natural gas price, such as seasonal

ity, storage levels, shut-in production and the vagaries of weather. 1 Nevertheless, they also find that it is possible to identify a statistically significant relationship between the two price series. Figure 7.2 shows the data of Figure 7.1 as a set of WTI and HH price pairs along with the simple rules of thumb indicated above. 2 Over this time period, the oil and natural gas prices each spanned a wide range, and the ratio of the WTI and HH prices ranged from about 5 to 20. None of the simple rules of thumb reproduce the principal trends over the full range of oil prices. However, it is interesting that, during the period 1991 to 2010, the oil/natural gas price ratio consistently exceeded 10, sometimes substantially, when the WTI price was above $80/bbl. As already noted, the ratio is close to 20 in the first half of 2011. Should these price ratios persist at high oil prices, the opportuni

ties for opening up the transportation fuels market to natural gas would be enhanced.Chapter 7: Geopolitics 151 

## During the period 1991 to 2010, the oil/gas price ratio consistently exceeded 10, sometimes substantially, when the WTI price was above $80/barrel... Should these price ratios persist at high oil prices, the opportunities for opening up the transportation fuels market to natural gas would be enhanced. Figure 7.2 Price Benchmarks Versus Observed Prices 1991–2010Natural Gas Price, 2010 $/MMBtu

0 5 10 15 20 25 30

0 25 50 75 100 125 150 Oil Price, 2010$/bbl Burner Tip Distillate Energy Content Burner Tip Resid 10-to-1 Best Fit Observed Prices

Figure 7.2 charts natural gas prices as a function of oil prices. The four straight lines show the four pricing rules-ofthumb. Using the ordering of the lines at the right of the figure, the top line is the burner-tip parity rule based on natural gas competing with distillate fuel oil, the second line is the energy-content equivalence rule, the third line is the burner-tip parity rule based on natural gas competing with residual fuel oil, and the fourth line is the 10-to-1 rule. The slightly curved line is the best-fit line calculated from a statistical analysis incorporating a number of additional variables and dynamics. The scatterplot of data points are the actual price combinations observed over the 1991 to 2010 period. All observed prices are quoted in real terms in 2010 dollars.

Using a relationship that is linear in the loga

rithm of prices, and accounting for a number of additional variables moving the natural gas price, Ramberg and Parsons derive a best-fit that can be approximated as

with the WTI and HH prices in dollars. This relationship is also shown in Figure 7.2 (solid line, labeled “best fit” relationship) and captures, to some extent, the increasing price ratio with increasing oil price. However, their analysis also confirms that the “best fit” relationship has shifted towards higher oil/gas price ratios in recent years. 2 European and Asian Markets
The European natural gas market developed later than that in the U.S. The initial impetus came with the discovery of the Groningen fields in the Netherlands starting in 1959. In the early 1960s, Algeria began LNG shipments to the U.K., then to France. Small quantities of 

### P HH 

### P WTI 

### = IO 70 P WTI152 MIT S T UDY ON T HE FU T URE O F N A T URAL GA S natural gas from the Soviet Union flowed into the other countries of Europe beginning with Austria in 1968.
The current structure of Europe’s natural gas markets is shaped by the 1973 Organization of the Petroleum Exporting Countries (OPEC) oil embargo. The European reaction was to explicitly tie the delivered price of natural gas to the price of crude oil or crude products. This limits the development of a deep and liquid spot natural gas market in Europe.
Currently, almost half the natural gas for Organization for Economic Cooperation and Development (OECD) Europe is imported, mostly by pipeline from Russia and North Africa, sometimes traversing other countries. LNG also supplies parts of Europe and is especially important to Spain and Portugal, which are on the far end of the Russian pipeline system.
The long supply chains into Europe, the prevalence of pipeline gas and the relative inflexibility of the markets create much more significant security of supply concerns than are experienced in North America. Diversification of supply is a high priority. However, even though the U.S. is not significantly dependent on imports, American security interests can be strongly affected by the energy supply concerns of its allies.

There have been moves in the EU to liberalize gas markets, starting with the U.K. in 1986. As part of a larger energy market liberalization effort, the EU in 1998 sought to create common rules for an internal natural gas market. The result has been the development of a small spot market on the European continent. Ultimate success will depend upon the future course of the EU’s regulatory reform. Progress is slow.
Industrialized Asia led the way in setting LNG prices through oil-indexed long-term contracts and remains bound to this market structure. This does not appear likely to change in the near term. With limited indigenous conven

tional natural gas resources, industrialized Asia and the emerging economies in that region are almost totally dependent on imported LNG from Southeast Asia, Australia and the Middle East. This dependence places a high premium on security of supply, which is reflected in the region’s dependence on long-term, relatively high-priced contracts indexed to oil.
The indexation of natural gas contract prices to the oil price was a necessary innovation to enable long lead-time contracts to partially accommodate fluctuating energy prices. But oil is an imperfect index for natural gas, as seen in our discussion of U.S. prices. Since the spot market oil and natural gas price relationshipdoes not match any simple formula, an oilindexed contract price cannot mimic very well the spot natural gas price; oil indexed prices are out of sync with the value of marginal deliveries of natural gas, sometimes being too high and other times too low. Therefore they cannot give the right signals for consumption of natural gas, inhibiting efficient use of the resource. In order for both buyers and sellers to capture the full value of natural gas resources, it is essential for long-term contracts to reflect the specific supply and demand conditions of natural gas, meaning a liquid market in gas spot deliveries. Absent this, buyers and sellers have not been able to do better than index contracts to the liquid oil price. Encouragement of the expan

sion of a liquid market in spot natural gas deliveries in Asia is in the interest of buyers and sellers and other parties in the value chain. As the use of natural gas grows throughout indus trialized Asia and Europe, the opportunity is ripe to realize the establishment of a spot market. This would make it possible to switch long-term contracts from a price linked to spot oil markets to a price linked to spot natural gas markets. In turn this will create the opportunity for the expanded use of natural gas and improve the possibility for international linkage. Never

theless, the path to a spot market is likely to beChapter 7: Geopolitics 153 complex and slow, and long-term contracts operating side by side with the spot market will be necessitated by the capital requirements of very long pipelines and LNG infrastructure.
Finally, we note that domestic markets in some major supplier countries, such as Russia, operate with very large subsidies. This leads to inefficient use that impacts volumes of natural gas available for export.

IMPLICATIONS OF MARKET INTEGRATION
Extrapolating from the lessons learned from the North American market, an interconnected delivery system combined with price competi

tion are essential features of a “liquid” market. This system would include a major expansion of LNG trade with a significant fraction of the cargoes arbitraged on a spot market, similar to today’s oil markets.
As described in Chapter 3, the Emissions Prediction and Policy Analysis (EPPA) model was used to investigate the consequences of global natural gas prices differentiated only by transportation costs (which are appreciable for long distances between buyer and seller). We emphasize that this is not a prediction that such a market will emerge, but rather an exploration of the implications of global market integra

tion. For the U.S., with the median expectations for both North American and global gas resources, the U.S. becomes a substantial net importer of gas in future decades in an inte

grated market and long-term domestic prices are lower than in the regionalized market structure. Also, greater diversity of supply is seen for all the major markets in this scenario. Clearly other scenarios could result from changes in resource estimates or from geopo

litical realities.

In addition, a functioning integrated market can help overcome disruptions, whether political in origin or caused by natural disas

ters. An example of this was seen in the U.S. oil markets, which recovered quickly following the 2005 hurricanes in no small part because of international market adjustments.
Overall, a “liquid” global natural gas market would be beneficial to U.S. and global economic interests and, at the same time, it would advance security interests through diversity of supply and resilience to disruption. These factors moderate security concerns about import dependence.

DIVERSITY OF SUPPLY
As already noted, the distribution of conven

tional natural gas resources is highly concen

trated, with Russia, Iran and Qatar being the largest resource holders. Indeed the global market scenario of Chapter 3, referenced above with regard to U.S. import possibilities, shows Russia and the Middle East becoming major suppliers to all three of the major regional natural gas markets — the U.S., Europe and industrialized and emerging Asia. The recent experience of Europe (curtailment of Russian natural gas) and the uncertain political future in the Middle East are a cause of concern, especially in Europe and Asia because of their large demand and limited or declining production. 

## Long-term contracts operating side by side with the spot market will be necessitated by the capital requirements of very long pipelines and LNG infrastructure. Extrapolating from the lessons learned from the North American market, an interconnected delivery system combined with price competition are essential features of a “liquid” market.154 MIT S T UDY ON T HE FU T URE O F N A T URAL GA S Figure 7.3 Global Shale Opportunities: Technically Recoverable Shale Reserves and 2009 Consumption (Tcf)

Source: : EIA/ARI, 2011 As has already happened in the U.S., unconven

tional resources could change the picture dramatically. The Energy Information Admin

istration (EIA) recently released “World Shale Gas Resources: An Initial Assessment”. 3 This report, prepared by Advanced Resources

International (ARI), presents estimates for potential shale gas development in 48 basins in 32 countries outside the U.S. It does not include regions with large conventional resources, such as Russia and the Middle East, since these seem unlikely to develop the shale resource in the near future. Even with this restriction, the estimate is for 5,760 Trillion cubic feet (Tcf), which is a substantial fraction of the approxi

mately 16,000 Tcf mean estimate of global resources discussed in Chapter 2. None of these shale resources was included in the global estimate or in the trade models of Chapter 3. ARI acknowledges that the estimates may have considerable uncertainty at this time, and will be refined over time as the shale resources are investigated by an increasing number of industry players.

The distribution of these shale resources is also interesting. Figure 7.3 shows some of the results 3 along with the current annual natural gas use in those countries. Pertinent to the discussion above, France and Poland are each estimated to have around 180 Tcf, and China over 1,200 Tcf. 

## The scale of the global shale gas resource is a potential game-changer...the trade flows in a global market could be affected substantially...and the leverage of MRHs to follow politically motivated strategies would presumably be diminished.Chapter 7: Geopolitics 155 These resources dwarf annual use and therefore present the possibility of exports that signifi

cantly affect import requirements for their regional natural gas markets. How this plays out remains uncertain; for example, while Poland intends to pursue production aggres

sively, France has declared a moratorium because of concerns about environmental impact. Nevertheless, the trade flows in a global market could be affected substantially if the global shale gas resource is developed at scale over the next decade or so, and the leverage of MRHs to follow politically motivated strategies would presumably be diminished.
Conventional natural gas finds, even if not on the scale of the apparent shale resource, can also impact diversity and security of supply when they occur in strategic locations. A recent example (2009 and 2010) is the large offshore finds in the eastern Mediterranean Levantine basin. The expectation is for more than 25 Tcf of resource in the Israeli economic zone. Inevitably there will be issues to be resolved involving the maritime borders of Israel, Lebanon, Gaza and Cyprus. Nevertheless, it appears that the security of supply for Israel, which currently uses about 0.2 Tcf of natural gas per year, has been transformed by the off

shore natural gas finds. In particular, it offers the possibility of greatly reduced oil dependence through direct or indirect use in transportation.

NATURAL GAS SECURITY CONCERNS AND RESPONSES
Energy supply generates security concerns when an economy is exposed to sudden disrup

tions that cannot be addressed by substitution of alternative primary energy sources. It should be noted that any source can be replaced with sufficient time and investment. For example, security concerns led France to make a strategic decision to base its electricity supply on nuclear power. Restricted access to oil led World War II-era Germany and Apartheid-era South Africa to large coal conversion to liquid fuel programs. For natural gas, the end use with the most dif

ficulty for adjustment to a sudden disruption is space heating. This was seen in January 2009 when Russian natural gas to Europe was cut off because of a dispute with Ukraine, a key pipeline transit country from Russia to Europe. Although the U.S. is not at risk of natural gas supply disruptions because of the large North Ameri

can resource and production infrastructure, the vulnerability of key allies is itself a security concern. Furthermore, the opportunity to substitute natural gas for oil as a transportation fuel feedstock improves resilience to “oil shocks.”
Transparent markets with diverse supply, whether global in reach or within large regions that encompass both major suppliers and large demand centers, do much to alleviate security risks. Nevertheless, the anticipated growth in gas use, combined with the geological realities of conventional gas resources, inevitably will produce continuing concerns, such as:

1. Natural gas dependence could constrain U.S. foreign policy options. U.S. freedom of action in foreign policy is tied to global energy supply. Iran, for example, presents many security challenges in the Middle East and is in confrontation with the West over a developing nuclear weapons capability. However its oil exports and its potential for natural gas exports set up conflicting objectives for the U.S. and its allies: altering Iran’s behavior, yet not risking supply interruptions of the oil and (eventually) natural gas markets. Such situations threaten allied cohesion in foreign policy.
Specifically, the U.S., with its unique interna

tional security responsibilities, can be constrained in pursuing collective action if its allies are limited by energy security vulnerabilities. 4 The natural gas cutoff to Europe demonstrated Russia’s market power156 MIT S T UDY ON T HE FU T URE O F N A T URAL GA S 

## A global “liquid” natural gas market is beneficial to U.S. and global economic interests and, at the same time, advances security interests through diversity of supply and resilience to disruption. in a situation where key allies have inad

equate alternative supplies and insufficient short-term substitution possibilities in a key sector. Russia has argued that the Ukraine dispute was commercial, that Ukraine should not have blocked transshipments and that it is a reliable supplier. However, the fact that they were selectively moving towards market prices in some Former Soviet Union states and not others suggested political motivations for the disruption. In any event, security implies removing or minimizing vulnerabilities, so U.S. support and encouragement of shale gas develop

ment, alternative pipeline supplies (e.g., from the Caspian region) and transparent LNGs markets with a robust LNG infra

structure should be viewed as favoring U.S. security interests.

2. New market players could introduce impediments to the development of trans

parent markets. The new large consuming economies, such as China and India, are increasingly seeking bilateral arrangements that include non-market concessions. Such arrangements have the potential to influence long-term political alignments, move away from open, transparent natural gas markets and work against the interests of consuming nations as a whole. Major natural gas producers have shown some interest in forming a cartel to control supply, but this movement is not yet very advanced. 5 Global shale gas developments would make such a cartel very difficult to implement effectively. 3. Competition for control of natural gas pipelines and pipeline routes is intense in key regions. Control of pipeline routes gives natural gas suppliers tremendous leverage over consuming nations, and competition for these routes is often a “high stakes game.” The landlocked Caspian region, which possesses large oil and gas resources, provides an important example of the geopolitical complexity that can develop. Decades ago, the Caspian was surrounded by only the USSR and Iran, and the legacy natural gas pipeline infrastructure is entirely through Russia. The Russia-Ukraine-Europe natural gas delivery cutoff of 2009 spurred Europe to further its intentions to explore pipeline routes out of the Caspian Sea region to Europe while avoiding Russia. This mirrorsthe earlier construction of the Baku-TbilisiCeyhan (BTC) oil pipeline that took an East-West route from Azerbaijan to Georgia to Turkey, but the gas pipeline is more complicated precisely because of the physical characteristics of oil and natural gas and the resulting transportation options. The BTC oil pipeline can use ships to cross the Caspian for supply from Kazakhstan and ships to export the oil from Turkey. On the other hand, the proposed Nabucco pipeline from Baku to Austria is thousands of kilometers long and crosses Romania, Bulgaria and Hungary just from Turkey to the Austrian hub. Furthermore, supply from the Eastern side of the Caspian, particularly Turkmenistan, is crucial for supplying sufficient natural gas volumes, but a subsea pipeline to Baku faces complications because of unresolved seabed jurisdictional disputes. Yet another complication is competition for Turkmen natural gas from China, which has already begun supply through a very long pipeline to Shanghai. Not surprisingly, the competition and competing political pres

sures on the governments in Central Asia and the Caspian region over pipelines out of the region is intense. It is unclear how this will be resolved.Chapter 7: Geopolitics 157 While the Caspian presents a particularly complex situation, long pipelines crossing multiple countries inherently raise trans

shipment concerns. Another example is the proposed Iran-Pakistan-India pipeline. For a summary, see “Natural Gas and Geopolitics: From 1970 to 2040”. 6

4. Longer supply chains increase the vulner

ability of the natural gas infrastructure. As supply chains multiply and lengthen, these infrastructures have become increasingly vulnerable to both malevolent attacks and natural disasters. Pipelines, processing facilities, LNG terminals and tankers are “soft targets,” i.e., easy to locate and destroy, usually undefended and vulnerable to attacks, including cyber attacks.
As the use and trade of natural gas grow over the coming decades, with an uncertain global market structure, U.S. policy makers must be well informed and manage the interrelationship between natural gas markets, both domestic and international, and security in order to limit adverse effects on U.S. and allied foreign policy.

RECOMMENDATIONS

1. The U.S. should sustain North American energy market integration and support development of a global “liquid” natural gas market with diversity of supply. A corollary is that the U.S. should not erect barriers to natural gas imports or exports.
Robust global LNG trade and progress toward spot pricing of cargoes, especially in Asia, are necessary for establishment of a global natural gas market. 2. A federal multi-agency coordinating body should be established to better integrate domestic and international implications of natural gas market developments with foreign and security policy.
Numerous agencies (Energy, State, Treasury, Defense, Commerce, etc.) have a major stake in this integration, so the Executive Office of the President must exercise the necessary convening power and leadership. To be successful, strong energy policy support for the coordinating group must be established

in the Department of Energy. This is in accord with the recommendation for a Quadrennial Energy Review issued by the President’s Council of Advisors on Science and Technology. 7

3. The IEA should be supported in its efforts to place greater emphasis on natural gas and security concerns.
To do so meaningfully, it must bring the large emerging natural gas-consuming economies (such as China, India, Brazil) into the IEA process as integral participants. The process should promote open and transparent energy markets, including the natural gas market.
A global natural gas market may lead, as in the U.S., to lower natural gas prices relative to oil. If this in turn stimulates more substi

tution of natural gas for oil in the transpor

tation fuels market, IEA’s core mission of advancing energy security will be advanced. 

## A federal multi-agency coordinating body should be established to better integrate domestic and international implications of natural gas market developments with foreign and security policy.158 MIT S T UDY ON T HE FU T URE O F N A T URAL GA S N OTES

1 David J. Ramberg and John E. Parsons, MIT Center for Energy and Environmental Policy Research report 10-017, November 2010.

2 ibid.

3 World Shale Gas Resources: An Initial Assessment, prepared by ARI for the U.S. EIA, April 2011, www.eia.gov/analysis/studies/worldshalegas.

4 National Security Consequences of U.S. Oil Dependency; J. Deutch and J. Schlesinger, chairs, D. Victor, project director; Council of Foreign Relations Independent Task Force Report No. 58 (2006). 5 What is the Gas Exporting Country Forum (GECF) and what is its objective?, EIA 2009; http://www.eia.doe.gov/oiaf/ieo/cecf.html.

6 Natural Gas and Geopolitics: From 1970 to 2040, D. Victor, A. Jaffe, and M. Hayes, editors, Cambridge University Press, 2006.

7 Report to the President on Accelerating the Pace of Change in Energy Technologies through an Integrated Federal Energy Policy, President’s Council of Advisors in Science and Technology, November 2010, www.whitehouse.gov/ostp/pcast. 4. The U.S. should continue to provide diplomatic and security support for the siting, construction and operation of global natural gas pipelines and LNG facilities that promote its strategic interests in diversity and security of supply and global gas market development.

5. The U.S. government, in concert with the private sector, should seek to share experience in the characterization and development of global unconventional natural gas resources in strategic locations. This includes strengthening the Global Shale Gas Initiative (GSGI).
Global shale gas resources at the several thousand Tcf scale have the potential to be game-changers with regard to the market and security issues discussed in this chapter. The U.S. has a strong interest in seeing this development and, to date, has been by far the leader in exploiting unconventional natural gas resources. The GSGI is led by the Department of State, with support from the Departments of Interior, Energy and Commerce and from the Environmental Protection Agency. It provides assistance as requested on resource assessments; production and investment potential; and business and regulatory issues. China, India, Jordan and Poland are working with the GSGI.
The experience of states in regulating environmental performance of shale gas production should also be brought to bear through the GSGI.

6. The U.S. should take the lead in international cooperation to reduce the vulnerability of natural gas infrastructure; help set security standards for facilities and operations; and provide technical assistance for sharing threat information, joint planning and exercises for responding to incidents.Chapter 8: RD&D 159 

# Chapter 8: Analysis, Research, Development and Demonstration

Natural gas is well positioned, with current technology, to play an increasingly important role in serving society’s clean energy needs over the next decades, assuming a policy “level playing field.” As seen in the analysis of Chapter 3, this is especially so in a carbon-constrained world, wherein the pathway to significant CO 2 emissions reductions has three major components:

s THROUGHOUT THE ANALYSIS PERIOD SIGNIlCANT

demand reduction relative to business-as-usual, including reductions arising from more efficient buildings, industrial processes and transportation technologies;

s natural gas as an extended “bridge” to a very low carbon future, principally by displacing the more carbon-intensive fossil fuels — coal and oil;

s in the longer term, “zero-carbon” technologies

as the dominant energy supply, which may include fossil fuel combustion with CO 2 capture and sequestration.
Continuing research, development and demon

stration (RD&D) will play an important role in determining the interplay of these components over time, especially as RD&D affects the relative costs of various tech nologies and fuels. While such cost reduction requirements are particularly acute for the zero-carbon technologies, RD&D that lowers cost and minimizes environmental impact is important for all three components. Indeed such technological progress can facilitate policy implementation that accelerates CO 2 emissions reduction, just as policy and regula

tion can stimulate technology development. In addition to prudence with regard to green

house gas (GHG) emissions, another important energy policy driver is reduced oil dependence. The analysis of Chapter 5 presented multiple pathways for natural gas substitution for oil in the transportation sector. Once again, the research challenges are to lower costs and increase flexibility of use.

FINDING There are numerous R D & D opportunities to address key objectives for natural gas supply, delivery and use:

t JNQSPWF UIF MPOHUFSN FDPOPNJDT PG resource development as an important contributor to the public good;

t SFEVDF UIF FOWJSPONFOUBM GPPUQSJOU PG natural gas production, delivery and use;

t FYQBOE DVSSFOU VTF BOE DSFBUF BMUFSOBUJWF applications for public policy purposes, such as emissions reductions and diminished oil dependence;

t JNQSPWF TBGFUZ BOE PQFSBUJPO PG OBUVSBM gas infrastructure;

t JNQSPWF UIF FöDJFODZ PG OBUVSBM HBT DPOWFSTJPO BOE FOEVTF TP BT UP VTF UIF
resource most e ff ectively.

The fact that natural gas serves multiple sectors in competition with other primary fuels implies that many end-use efficiency RD&D programs will not be specific to natural gas (e.g., technol

ogy development for improving overall building energy efficiency). Similarly, there are many common elements of the technology base both160 MIT S T U D Y ON T HE FU T U R E O F NAT U RA L G AS for oil and gas exploration and production, such as advanced drilling technologies (e.g., nanoparticle drilling fluids) and for CO 2 sequestration following fossil fuel combustion (e.g., the science of CO 2 sequestration and monitoring, novel capture technologies and hydrogen-rich operation of combustion turbines). Robust RD&D programs in all of these areas are very important for the future of natural gas and should be supported by public and private funding, but our discussion in this chapter will be confined to areas that are uniquely tailored to production and use of the natural gas resource and that promise to have significant impact

. It is worth reiterating that, while we focus on natural gas-specific technologies, the overall publicly-funded energy RD&D program should have a strong portfolio dedicated to the first and third components identified above: demand reduction and zero emissions tech

nolo gies. Notwithstanding the overall desira

bility of a level playing field, and in anticipation of a carbon emissions charge, support should be provided through RD&D and targeted subsidies of limited duration, for very low-emission technologies that have the prospect of comple

menting and competing with natural gas in the longer term. This would include efficiency, renewables, CO 2 sequestration for both coal and natural gas generation and nuclear power.

NATURAL GAS R ESEARCH NEEDS A N D OPP O RTU N ITIES
Relative to the role of natural gas in the energy sector, the Department of Energy (DOE), the lead government funder of energy RD&D, has historically had very small programs dedicated to natural gas exploration, production, trans

portation and use. This is evident in Table 8.1, which shows Congressionally-appropriated and Administration-requested amounts in recent years. In the early years of the DOE, in response to the oil shocks of the 1970s, the agency supported research and characterization work for unconventional natural gas reservoirs, and this provided an important foundation for subsequent RD&D and development of the unconventional natural gas industry (a point to be discussed later in the chapter). However, the DOE focus on natural gas RD&D was not sustained for a variety of reasons, including a fairly robust public-private partnership (the Gas Research Institute (GRI)) that was dedicated to natural gas RD&D across the value chain. The Royalty Trust Fund (RTF) indicated in Table 8.1 is an example of a more recent public-private partnership dedicated specifically to exploration and production, with public funding legislatively mandated as a very small fraction of Federal royalties on oil and gas production. Administration proposals to eliminate even this funding, made by both the previous and current Administrations, high

light the lack of agreement on the need for and role of publicly-funded natural gas RD&D.
Our perspective is rooted in the importance to society of wise use of the major unconventional natural gas resource that has been fully appreci

ated only recently. This resource is important both for addressing GHG emission challenges and for energy security, and the public has an interest in its effective and responsible produc

tion and its efficient use. Clearly, the increasingly prominent role of natural gas in the energy mix creates an impetus for increased private sector RD&D, when the benefits of such activities can be readily appropriated. This is happening to some degree for the upstream as the major oil and oil service companies move more strongly into unconventional resources. Nevertheless, there will be a need for public and public-private funding of research with longer and/or more uncertain payback periods than will attract private funding. In addition, there are important research needs for natural gas transportation and end-use in addition to production. Priority RD&D areas specific to natural gas follow.Chapter 8: RD&D 161 Improving the Economics of Resource Development
Analysis and Simulation of Gas Shale Reservoirs. Our discussion of supply in Chapter 2 demonstrates the importance of shale gas to the overall supply curves but also noted the potential for substantially higher resource production. DOE R&D funding should be aimed at the basic science that governs shale formations. Such a program could help develop a better understanding of the physics that underlies fluid flow and storage in gas shales; facilitate the development of more accurate reservoir models and simulation tools; and develop imaging tools and models for charac

terizing the geologic, geochemical and geophys

ical shale rock properties. The models should be able to predict the short-term and long-term behavior of induced and natural fractures in an integrated fashion. Practical 3-D models can improve reservoir management. Better resource characterization will enable assessment of resource play potential and well performance based on petrophysical measurements.
Improved microseismic formation mapping will advance optimization of real-time fracture treatments. At the macroscopic scale, new seismic techniques should be developed to identify “sweet spots” and natural fracture orientation. Publicly funded research in these areas will promote transparency into the effective use of the critical shale resource. Methane Hydrates. The Chapter 2 discussion also indicates the potential for major methane resources from economic hydrates production. More basic research issues need to be resolved for methane hydrates than for other natural gas sources. RD&D might usefully focus on: the systematic remote detection of highly concen

trated deposits; long-term production tests, particularly in permafrost-associated hydrates; and geo-hazard modeling to determine the impact of extracting free natural gas on the stability of associated hydrate-bearing sediments.
The longest production test to produce natural gas from forced dissociation of methane hydrate deposits had only a six-day duration due to the nature of the experiment, financial concerns and other issues. The technology and expertise to conduct a long-term production test exist today. Financial and logistical barriers have been the major impediments to complet

ing such a test in permafrost-associated hydrates. Determining the degree of safety and environmental risk associated with production from natural gas hydrates will require that appropriate data be collected during and after long-term production tests that are conducted over the next few years. Many of the safety and environmental issues will have to be addressed by modeling that takes into account a range of potential risks, including blowouts; co-production of CO 2 , water and gasses; FY08 FY09 FY10 FY11 (Req) FY12 (Req) Gas Hydrate Technologies 14.9 14.6 15.0 17.5 1 10.0 E ff ective Environmental Protection 5.0 4.9 2.8 0.0 0.0

Total Natural Gas Technologies 19.8 19.4 17.8 0.0 0.0 Royalty Trust Fund 50.0 50.0 50.0 0.0 0.0 Total G overnment Spending 69.8 69.4 67.8 17.5 10.0 Table 8.1 DOE Gas Technologies RD&D Program Funding ($ Million)

Source: FY 2009 – 2012 DOE Budget Request to Congress. 2162 MIT S T U D Y ON T HE FU T U R E O F NAT U RA L G AS borehole, formation and/or seafloor destabili

zation; and warming and potential thawing of permafrost.
Methane hydrates are a good candidate, some

time in the future, for another public-private success story of the type illustrated in Box 8.1 for coalbed methane (CBM), i.e., a combina

tion of government funding for resource characterization, public-private partnershipfor technology transfer and synergistic, timelimited financial incentives to advance com

mercial deployment. As the majors move into today’s unconventional resources and apply their research capacity, methane hydrates could be thought of as “tomorrow’s unconventional resource.”
Reducing the Environmental Footprint of Natural Gas Production, Delivery and Use

Water. As discussed in Chapter 2, a comprehen

sive program is needed to address issues of water use and backflow and produced water in unconventional gas production. Such a program could lead to: improved treatment, handling, re-use and disposal of fluids; more sustainable and beneficial use of produced water; and more effective stimulation tech

niques that require less water and other fluids to be injected into the subsurface. Nearly complete recycle of flowback frac water is an important goal. Some of the key water treatment needs include removal of polymers, control of suspended solids and scale control. Basic research on novel approaches is appropri

ate for public support. Natural Gas Combined-Cycle with CCS. Chapter 4 highlighted the importance of natural gas in an electricity system with large amounts of variable and intermittent sources. If CO 2 emission constraints are severe enough to require the capture of CO 2 from natural gas as well as coal plants, it will be important to understand the cycling characteristics and possibilities for natural gas power plants with CCS. This need will be ameliorated if inexpen

sive large-scale storage solutions are developed, but a research program to understand cycling capabilities at different time scales for natural gas generation would be prudent.
Fugitive Emissions. Methane emissions in natural gas production, transportation and use are not well understood. Research is needed for developing technologies and methodologies for reliably detecting and measuring such emissions. This may have significant monetary consequences in a world where CO 2 emissions are priced. Furthermore, the economic value of the methane implies that capture of the natural gas emissions for beneficial use merits develop

ment of improved technologies and methods.

The DOE and EPA should co-lead a new effort to review, and update as appropriate, the methane and other GHG emission factors associated with fossil fuel production, transpor

tation, storage, distribution and end-use. These results are important for overall energy policy, as discussed in Chapter 1.Chapter 8: RD&D 163 Box 8.1 Unconventional Gas: Public/Private Partnerships and Tax Incentives The interplay of early DOE funding, industry-matched GRI applied RD&D and synergistic policy incentives had a material impact on U.S. unconventional natural gas development. This is illustrated in Figures 8.1 and 8.2 for CBM and shale, respectively. 3 The DOE funding was focused on reservoir characterization and basic science. GRI implemented industry-led technology roadmaps leading to demonstration. This overlapped with a time-limited tax credit put in place for wells drilled from 1980 to 1992, with their production eligible for the credit through 2002. The results of this multi-pronged approach to public-private RD&D and deployment are particularly striking for CBM. For shale, the program is credited with laying a foundation by developing new logging techniques, reservoir models and stimulation technologies. See Appendix 8.A.

Figure 8.1 CBM RD&D Spending and Supporting Policy Mechanisms

14

12

10

8

6

4

2

0Program Budget(Millions of dollars in 1999 dollars)Annual CBM Production (Tcf)/Value of Tax Credits ($/Mcf)

Year1976197719781979198019811982198319841985198619871988198919901991199219931994199519961997199819992000200120022003200420052006200720082009

CBM Production Eligible Gas DOE Spending GRI Spending Tax Credits 2.50

2.00

1.50

1.00

0.50

0.00

Figure 8.2 Shale Gas RD&D Spending and Supporting Policy Mechanisms

40

35

30

25

20

15

10

5

0Annual Program Budget(Millions of dollars in 1999 dollars)Annual Shale Gas Production (Tcf)/Tax Credits ($/Mcf)

Year1976197719781979198019811982198319841985198619871988198919901991199219931994199519961997199819992000200120022003200420052006200720082009

Shale Gas Production DOE Spending GRI Spending Tax Credits 3.50

2.00

1.50

1.00

0.50

0.00 2.50 3.00164 MIT S T U D Y ON T HE FU T U R E O F NAT U RA L G AS Expanding Current Use and Creating Alternate Applications for Natural Gas

Power Generation. As seen in Chapter 3, natural gas use in the power sector is expected to increase substantially. Growth will be especially important under CO 2 emissions constraints, since natural gas substitution for coal is, along with demand reduction, the least costly response in the near-to-intermediate term. We also saw in Chapter 4 that natural gas capacity is likely to increase substantially in response to a greater deployment of wind and solar, and transmission constraints and natural gas infrastructure are both central consider

ations for such a development (Chapter 6). Advanced analysis and simulation tools are needed for the converged electricity and gas sectors. Such tools will be invaluable for informing technically-grounded energy policies and regulations. The model/simulation tools need to incorporate several features, including:

s DEVELOPMENT OF BETTER HYBRID MODELS FOR

integrating power sector top-down and bottom-up approaches;

s INTEGRATED UNDERSTANDING OF POWER SYSTEM

operation and natural gas distribution requirements with large penetration of intermittent sources, distributed generation, and smart grids;

s BOTH NEAR
TERM AND LONG
TERM PLANNING TOOLS

for electricity and gas capacity planning and infrastructure development.
Mobility. As noted in Chapter 5, natural gas currently plays a very small role in transporta

tion. In the U.S., it is used almost exclusively for fleets with high mileage and small geographical area driving requirements. However, the strong desire to reduce oil dependence, together with today’s historically large spread between oil and natural gas prices, has led to an examination of natural gas as a material alternative transporta

tion fuel. This can be accomplished either through direct use in combustion engines or through conversion to a liquid fuel.
For light-duty vehicles, extensive simulations of the safety and environmental performance of vehicles retrofit for CNG operation should be carried out with a view to streamlining regula

tions and lowering cost, to bring U.S. condi

tions more in line with the certified retrofit costs elsewhere.
There are multiple pathways to natural gasderived liquid transportation fuels (methanol, ethanol, mixed alcohols, DME, diesel, gasoline, etc). Various fuels and fuel combinations can be used in appropriately modified internal com

bustion engines, including optimization for increasing efficiency by use of alcohol fuels and DME. Different fuels will have different fueling infrastructure requirements. The DOE should support a comprehensive end-to-end analysis, supported by engineering data, of the multiple pathways. The analysis would include an assessment of costs; vehicle requirements; environment, health and safety effects; and technology development needs. This informa

tion will be important for guiding energy policy and the introduction of oil alternatives.
Improving Conversion Processes
Industry has often been at the forefront of energy-efficiency improvements because of the direct impact on the bottom line, but signifi

cant additional opportunities lie at the nexus of energy efficiency, environmental quality and economic competitiveness. Some process improvements may require substantial changes in manufacturing, such as novel membranes for separations, more selective catalysts-by-design for synthesis or improved systems integration for reduced process heating requirements. In the chemicals industry, the promise of biomass feedstocks and new bioprocessing technologies is attracting considerable interest and needs further RD&D. Yet another opportunity would be development of new process technologiesChapter 8: RD&D 165 for low-temperature separation methods. Such developments can substantially reduce natural gas requirements and improve industrial competitiveness.
The potential for significant reductions in the use of natural gas for industrial process heating lies in a shift to new manufacturing process technologies that require less process heat or utilize new, less energy-intensive materials (Chapter 5).
The DOE should support pre-competitive research in these areas and also use its conven

ing power to bring together energy-intensive industry sectors to identify opportunities for lowering energy needs, emissions and costs. Roadmaps for future energy-efficiency tech

nology improvements would be developed through this public-private collaboration. This is essentially the role played in the past by the Industries of the Future Program, and some

thing like it should be re-created. Crosscutting technologies applicable across a broad spec

trum of manufacturing industries (such as materials for extreme environments and separation technologies) would also be identi

fied and should be included in a new DOE program.
Improving Safety and Operations of Natural Gas Infrastructure
Pipeline safety, discussed in Chapter 6, is an increasingly critical issue because of the age of much of the natural gas transmission and distribution system. There is a strong public interest in this area, but the federal program is small. Public-private partnership is appro

priate for:

s IMPROVING MONITORING AND ASSESSMENT

of system integrity;

s ENHANCING SYSTEM RELIABILITY AND RESILIENCE

s REDUCING THE INCIDENCE AND COST OF SUBSURFACE

damage; s LOWERING COST OF CONSTRUCTION MAINTENANCE and repair;

s IMPROVING DATA QUALITY

s MINIMIZING THE ENVIRONMENTAL FOOTPRINT
In addition, the DOE should support novel concepts focusing on in-line inspections, corrosion prevention and protection and anticipatory maintenance.
Modeling and simulation tools should be developed in the public domain for analysis of the growing interdependency of the natural gas and power generation infrastructures. These are needed to support analysis of the system impacts of increased use of natural gas for power generation and associated infrastructure stresses and vulnerabilities, particularly with respect to changes in storage and deliverability requirements.
Improving the Efficiency of Natural Gas Use
We saw in Chapter 5 that, in addition to power generation and industrial use, the other major use of natural gas is for space conditioning and appliances in residential and commercial buildings. Lower-cost, gas-fired, instantaneous hot water heaters are an example of an appli

ance improvement that can significantly reduce natural gas consumption. Similarly, lower-cost high-efficiency heat pumps for appropriate climates can economize on natural gas used for space heating. Advances in these and other building energy technologies are a good target for public-private partnerships.
Combined heat and power was seen in Chapter 5 to offer significant system efficiency, emissions and economic benefits, especially for larger installations (Megawatt scale). This should be encouraged. However, micro-CHP (kilowatt scale) will need a substantial breakthrough to become economic. Micro-CHP technologies with low heat-to-power ratios will yield greater benefits for many regions, and this suggests166 MIT S T U D Y ON T HE FU T U R E O F NAT U RA L G ASsustained research into kW-scale, hightemperature, natural gas fuel cells. Basic research into new nano-structured materials will be central to such programs.

FU N DI NG A N D MA N A G E M E N T OF NATURAL GAS RD & D
Given the importance of natural gas in a carbon-constrained world, and the opportuni

ties indicated above for improved utilization of the resource, an increase is in order in the level of public and public-private RD&D funding indicated in Table 8.1. However, the budgetary pressures facing the Administration and Congress dim the prospects for additional appropriations in the next several years. To discuss an alternate path forward, it is impor

tant to understand the history that led to the current low level of research support. A more detailed description of natural gas RD&D fund

ing is given in Appendix 8.A.
The DOE natural gas research funding history is summarized in Figure 8.3. Between 1978 and 2010, the total expenditure was just over $1 billion. Major elements have included:

s ASSESSING AND CHARACTERIZING UNCONVENTIONAL

natural gas resources (especially shale) in the early years of DOE operations;

s SMALL BUT CONSISTENT SUPPORT FOR RESEARCH

on environmental protection;

s AN EXPLORATION AND PRODUCTION PROGRAM

focusing on advanced drilling, completion and stimulation;

s DEVELOPMENT OF HIGH
TEMPERATURE HIGH

efficiency, low NOx gas turbines in collabora

tion with industry during the 1990s, with nearly $300 million of DOE support (see Appendix 8.B);

s METHANE HYDRATES RESEARCH DURING THE LAST

decade. Apart from the funding increase to support the cost-shared advanced turbine development, the program has averaged about $24 million/year.
This low funding level must be viewed in the context of parallel public-private approaches to natural gas research funding and management. The Federal Energy Regulatory Commission (FERC) exercised an authority to require a surcharge on interstate pipeline gas volumes to support consumer-focused RD&D for the natural gas industry. The FERC-approved surcharge in 1978 was equal to 0.12 cents per Mcf, rising to 1.51 cents per Mcf a decade later. 4 This led to a research fund in excess of $200 million/year for an extended period, yielding over $3 billion over the life of the surcharge.
The GRI was established in 1976 as a private non-profit research organization charged with managing the funds. It was required to have a Board of Directors representing the natural gas industry, industrial consumers and the public and to submit a research plan annually for FERC approval. Important features of this approach were applied research and development closely connected to industry operational and technology needs, a broad RD&D portfolio from production to end-use, and the ability to make long-term commitments and attract cost-sharing based on an assured funding stream. GRI programs leveraged substantial industry matching funds.
Clearly, the GRI funding was substantially greater than the DOE’s. Joint portfolio planning was performed regularly to ensure that the programs were complementary. Box 8.1 shows the interplay between the early DOE support for unconventional natural gas RD&D, the sustained GRI effort to work with industry in developing and demonstrating unconventional natural gas production technology and a synergistic time-limited tax credit for uncon

ventional production. There has been a consid

erable and continuing return on a relatively modest RD&D investment.Chapter 8: RD&D 167 However, in the wake of pipeline deregulation, the surcharge was ended. In a regulated envi

ronment, the surcharge was easily passed on by the pipeline companies to ratepayers. After pipelines became common carriers in 1992, large gas consumers could contract directly with natural gas producers. In this new market

place, the surcharge, although small, became a competitive issue. The combination of “bottom line” pressures associated with competitive markets, the tendency of state regulators to eschew rate increases in competitive markets and a number of “free riders” (primarily intrastate pipelines in Texas that did not pay the surcharge) resulted in phaseout of the surcharge between 2000 and 2004. The GRI ended as a research management organization through a merger, in 2000, with the Institute for Gas Technology to form the Gas Technology Institute (GTI). The GTI managed the phaseout of the FERC-approved program and today serves as a research-performing non-profit organization. Its budget is substantially less than that of GRI.
The Energy Policy Act of 2005 established the Royalty Trust Fund (RTF) to support a 10-year $500 million research program (see Table 8.1) with a narrower research scope than had been the case for GRI: the Ultra-Deepwater and Unconventional Natural Gas and Other Petro

leum Resources Research Program. It is focused exclusively on exploration and production, including associated environmental impacts. The RTF draws its funding from a small frac tion of royalties paid to the Federal government for oil and gas production leases of Federal on-shore and off-shore tracts. The program structure has many similarities to that of GRI: 75% of the funds are managed by a non-profit Figure 8.3 DOE Natural Gas Research Funding History

80

60

40

20

0Spending (Millions of Nominal $)NG Prices ($/Mcf Nominal)

Year19781980198219841986198819901992199419961998200020022004200620082010 10

8

6

4

2

0

Eastern Gas Shales Project Methane from Coal Gas from Oil Shale Infrastructure Environmental and Advanced Research Capital Equipment Infrastructure Natural Gas Prices Western Gas Sands Project Geopressured Aquifers Exploration and Production Advanced Turbine Systems Utilization Gas Hydrates Congressionally-directed Projects

Source: DOE Office of Fossil Energy.168 MIT S T U D Y ON T HE FU T U R E O F NAT U RA L G AS research management organization, the Research Partnership to Secure Energy for America (RPSEA); an annual program plan is approved by the Federal government, in this case the DOE; there are specific industry cost-sharing requirements; in principle, the mandatory funding allows for long-term stable funding of projects in collaboration with industry. Unfortunately, the advantages of stable funding have been more difficult to capture in this case since, as seen in Table 8.1, there have been persistent attempts to terminate the program.

FINDING 5IF FMJNJOBUJPO PG UIF SBUFQBZFS GVOEFE R D & D program was not compensated by increased D OE appropriations or CZ UIF 35' 5IF UPUBM QVCMJD BOE QVCMJD private funding for natural gas research is down substantially from its peak and is more limited in scope, even as natural gas takes a more prominent role in

B DBSCPODPOTUSBJOFE XPSME

The GRI and the RTF research models highlight the value of federally-sanctioned alternative research models, with industry-led portfolios and dedicated multi-year funding mechanisms, in those cases specifically for natural gas RD&D. This value is derived primarily from: consistent funding over time; significant opportunities for industry input in program development and technical project reviews; and active collaboration between government, industry, academic institutions, the national labs and non-governmental organizations. GRI also had a significant analytical unit, used widely by industry and policy makers until it was eliminated in 2001, as the surcharge funding started phasing out. Such a role is not easily incorporated into the DOE applied energy offices. Recently, the President’s Council of Advisors on Science and Technology (PCAST) put forward a set of recommendations for federal energy research and policy that draws upon this experience. 5 The PCAST first recommends an overall annual funding level for energy research programs of around $16 billion, an increase of $10 to $11 billion over the DOE funding level. To be effective, PCAST observed that the funding must be “long-term, stable and have broad enough bipartisan support to survive changes of Administration” and, recognizing the intense pressures on the annual domestic discretionary budget, recommended further that the additional funding be found largely through “new revenue streams,” analogous to the FERC surcharge or the RTF. The PCAST further suggested that there is value in the external management of a portion of these funds, with strong industry input particularly for the development and demonstration phases, allowing the DOE to focus on its core strengths of funding basic and translational research and to serve an oversight role for the externally managed funds. These recommendations would extend the alternative models for funding and managing natural gas research to the entire energy RD&D portfolio and carry a certain degree of irony given the demise of GRI stimulated by deregulation and the continuing pressures on the RTF.Chapter 8: RD&D 169 R E C O M M E NDA T I O N The A dministration and C ongress should support R D & D focused on environmentally responsible, domestic natural gas supply. This should entail both a renewed D OE program, weighted towards basic research, BOE B DPNQMFNFOUBSZ JOEVTUSZMFE program, weighted towards applied R D & D , that is funded through an assured funding stream tied to energy production, delivery and use. I n particular, the RTF should be continued and increased in its allocation commensurate with the promise and challenges of unconventional natural gas.
Furthermore, consideration should be given
UP SFTUPSJOH TVDI B QVCMJDQSJWBUF 3%% research model for natural gas USBOTQPSUBUJPO BOE FOEVTFT BT XFMM170 MIT S T U D Y ON T HE FU T U R E O F NAT U RA L G AS N O TES

1 In FY 2011, a new methane hydrates program will be initiated by the DOE Office of Basic Energy Sciences under the Geosciences Research program.

2 FY 2009 – FY 2012 DOE Budget Request to Congress.

3 DOE Office of Budget. FY 1978 to FY 1996, DOE Budget Requests to Congress; Gas Research Institute 1979–1983 to 1994–1998, Research and Development Plans. Chicago, Ill., Gas Research Institute. 4 Process Gas Consumers Group, Petitioner, v. Federal Regulatory Energy Commission, Respondent. American Gas Association, Interstate Natural Gas Association of America, Fertilizer Institute, Gas Research Institute, Georgia Industrial Group, Intervenors. No. 88-1109. United States Court of Appeals, District of Columbia.

5 President’s Council of Advisors on Science and Technology, Report to the President on Accelerating the Pace of Change in Energy Technologies Through an Integrated Federal Energy Policy, November, 2010.