Electricity

Rate-Based Compliance Under the Clean Power Plan

Rate-Based Compliance Under the Clean Power Plan

January 2016

Download the Fact Sheet (PDF)

The Clean Power Plan gives states the option to comply via either a rate-based or a mass-based approach. Ten states currently operate mass-based greenhouse gas reduction programs, and many more participate in mass-based programs to reduce other pollutants (e.g., sulfur dioxide) that are administered by the U.S. Environmental Protection Agency.
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FutureGen 2.0

The first two weeks of August saw two big news items from the U.S. Department of Energy (DOE) related to carbon capture and storage (or CCS, for an overview of CCS see the our Climate TechBook CCS brief). First, on August 5, DOE announced its plans for FutureGen 2.0. One week later, President Obama’s Interagency Task Force on CCS delivered its final report and recommendations regarding overcoming “the barriers to the widespread, cost-effective deployment of CCS within 10 years, with a goal of bringing five to ten commercial demonstration projects online by 2016” (see the separate post regarding the task force’s report).

Why is this FutureGen announcement from DOE important? CCS is anticipated to be a key technology for achieving large reductions in U.S. and global greenhouse gas (GHG) emissions (for example, see the recent projection from the International Energy Agency that CCS could provide nearly one fifth of all global GHG emission reductions by mid-century). Initial commercial-scale CCS demonstration projects are a critical step in advancing CCS technology; these projects provide valuable experience and confidence in “scaling-up” CCS technologies and technology improvements and cost reductions from “learning by doing.” The aforementioned report from the Interagency Task Force on CCS notes that FutureGen is one of ten planned CCS demonstration projects supported by DOE (see Table V-2 of the task force’s report for the list of seven power-sector and three industrial CCS projects).

The FutureGen project has had a somewhat tumultuous history. In 2003, DOE announced its plan to work with an industry consortium on the FutureGen plant to demonstrate commercial-scale integrated gasification combined cycle (IGCC) technology coupled with (pre-combustion) CCS at a single new coal-fueled power plant (with DOE covering most of the project’s costs). In 2007, the industrial consortium selected a site in Mattoon, IL, for the FutureGen power plant. In 2008, though, DOE abandoned the idea citing the escalating cost estimates for the FutureGen project and decided instead to pursue cost-sharing agreements with project developers to support multiple CCS demonstration projects (this time with DOE covering a smaller fraction of project costs). DOE received only a small number of applications for this restructured FutureGen approach, and this change of plans came in for some criticism from the Government Accountability Office (the GAO report also provides a helpful overview and history of what might now be referred to as “FutureGen 1.0”).

In 2009, the Obama Administration revived plans for a single FutureGen plant and restarted work with the industrial consortium on preliminary design and other activities, promising a decision in 2010 on whether to move forward with the project. That decision came on August 5 and included another shift in DOE’s plans for the FutureGen project (now dubbed “FutureGen 2.0”). Energy Secretary Chu announced the awarding of $1 billion in Recovery Act funding for the repowering of an existing power plant in Meredosia, IL, as a coal-fueled power plant using oxy-combustion and CCS. With “FutureGen 2.0,” DOE decided to change from building a new plant to repowering an existing one and chose a different technology (oxy-combustion with CCS rather than IGCC with CCS).

When subsidizing initial CCS demonstration projects, policymakers should support a variety of relevant technologies and configurations. With respect to applying CCS technology to coal-fueled electricity generation, there are factors that are expected to make certain variants of CCS technology more appropriate for certain circumstances. These factors include the application of CCS with: new plants vs. retrofitting/repowering existing plants; different coal types; and various geologic formations for CO2 storage. Importantly, there are three types of CO2 capture technology—pre-combustion, post-combustion, and oxy-combustion—with the latter two appropriate for use at existing coal-fueled power plants (see our Climate TechBook CCS brief for details). 

With its new approach for “FutureGen 2.0” DOE has focused on large-scale demonstration of oxy-combustion. Of the ten CCS demonstration projects supported by DOE, FutureGen will be the only one to use the oxy-combustion technology. Of the 34 large-scale power plant CCS projects worldwide tracked by MIT, only four (counting FutureGen) use or plan to use oxy-combustion, and FutureGen will be the only such oxy-combustion project in the United States. Given the greater focus so far given to the two other alternative CCS approaches, oxy-combustion is likely the CCS technology that can most benefit from the FutureGen large-scale demonstration project.

With its new approach for “FutureGen 2.0,” DOE is taking an important step in demonstrating a portfolio of different CCS technologies. Such demonstrations, along with other supportive government RD&D policies, provide a critical “push” for low-carbon technologies. Long-term policy certainty (such as from a GHG cap-and-trade program) for the private sector regarding future GHG emission reduction requirements can provide the necessary technology “pull” to guide private investments in widespread deployment of CCS and other low-carbon technologies.

Steve Caldwell is a Technology and Policy Fellow

CCS Recommendations Hit President’s Desk

Last week, the Obama Administration’s Interagency Task Force on Carbon Capture and Storage (CCS) released its final report and recommendations. President Obama created the task force, co-chaired by the Department of Energy (DOE) and the Environmental Protection Agency (EPA) and involving 14 executive departments and federal agencies, in February. The President’s directive charged the task force with delivering “a proposed plan to overcome the barriers to the widespread, cost-effective deployment of CCS within 10 years, with a goal of bringing 5 to 10 commercial demonstration projects online by 2016.”

Nuclear Waste Commission, Yucca Mountain, and Loan Guarantees

Recent news has cast a spotlight on nuclear power. We’ve blogged before about nuclear power and its potential to play a large role in decarbonizing the electricity sector.

First among the big news items related to nuclear power is the official naming by the Obama Administration of a much-anticipated Blue Ribbon Commission on America’s Nuclear Future to recommend a safe, long-term solution for used nuclear fuel and nuclear waste. The commission, announced on January 29, will issue its final report within 24 months. Energy Secretary Chu noted that the commission is not tasked with recommending a site for a long-term waste repository.

Natural Gas and Our Energy Future

We just added a brief on natural gas to its Climate TechBook that helps to explain why natural gas is unique among fossil fuels. Natural gas is both a contributor to climate change (natural gas combustion accounts for about 16 percent of total U.S. greenhouse gas emissions) and an option for reducing emissions since natural gas is less carbon-intensive than coal and petroleum. The United States could actually reduce total greenhouse gas emissions by burning more natural gas if it’s displacing other fossil fuel use (this is particularly the case for fuel switching from coal to gas in power generation).

Like coal, but unlike petroleum, natural gas is primarily a domestic energy resource, with net imports of natural gas constituting only about 13 percent of U.S. consumption and about 90 percent of imports coming from North America. Unlike coal (93 percent consumed for electricity generation) and petroleum (more than two thirds used for transportation), natural gas consumption is more evenly split across the electric power, industrial, residential, and commercial sectors.

The past few years have seen a “revolution” in the outlook for natural gas supply. Until recently, experts thought that the United States would become increasingly dependent on expensive imports of liquefied natural gas (LNG) from overseas, but the recent boom in domestic “unconventional” gas production (driven by shale gas) and the dramatically increased estimate of U.S. gas reserves have led to projections of increasing domestic natural gas production and declining imports.

Natural gas is receiving a lot of attention in the discussion about U.S. climate and energy policy. The gas industry is pressing for favorable treatment in possible climate and energy legislation, with a specific set of policy priorities recently put forth by a major industry lobby group.

While some tout natural gas as a “bridge fuel” to a low-carbon future others fear that a “dash for gas” (i.e., fuel switching by electric power generators) could increase demand for and the price of natural gas, thus negatively impacting manufacturers that rely on natural gas for energy and as a feedstock.

Recent analysis by the U.S. Energy Information Administration (EIA) of the climate and energy bill passed by the House in June 2009, illustrates how the projected role of natural gas in reducing U.S. greenhouse gas emissions depends in large part on the use of offsets under cap and trade and the relative cost and commercial availability of low-carbon technologies (e.g., wind, solar, carbon capture and storage, and nuclear power). When low-carbon technology deployment and offsets are constrained, EIA finds a much heavier reliance on natural gas for electricity generation under cap and trade, but the new outlook on U.S. natural gas supply means that even this pessimistic scenario does not lead to major increases in projected natural gas prices.

A new modeling analysis from Resources for the Future (RFF) sought to quantify the implications of the dramatically expanded U.S. natural gas supply. RFF researchers found that without new energy and climate policy, more abundant and less expensive natural gas could actually mean slightly higher U.S. greenhouse gas emissions in 2030 than would otherwise be the case (as cheaper natural gas competes with non-emitting energy sources and increases total energy consumption).

This last point brings us back to the overarching importance of implementing a policy that puts a price on carbon, as a greenhouse gas cap-and-trade program would do. Putting a price on carbon would harness market forces to drive the deployment of a portfolio of low- and lower-carbon technologies and fuels, including increased natural gas use to the extent it can cost-effectively reduce emissions.

Steve Caldwell is a Technology and Policy Fellow

Smart Grid Boosts Efficiency, Renewables, and Reliability

The smart grid is a hot topic these days. President Obama touted the smart grid during his campaign and continues to be a booster. The 2009 stimulus bill (the American Recovery and Reinvestment Act, ARRA) provided nearly $4.5 billion to the Department of Energy (DOE) for smart grid investments. In October, DOE made $3.4 billion in awards under the Smart Grid Investment Grant Program, and, in November, DOE announced awards totaling $620 million as part of the Smart Grid Regional and Energy Storage Demonstration Project.

Last month, we added a smart grid factsheet to its Climate Techbook. While it’s not easy to give a short definition of the smart grid, one can think of it as the application of digital technology to the electric power sector to improve reliability, reduce cost, and increase efficiency. Smart grid technologies—including communication networks, advanced sensors, and monitoring devices—provide new ways for utilities to generate and deliver power and for consumers to understand and control their electricity consumption.

The smart grid has several anticipated benefits unrelated to climate change, such as improving electricity reliability (e.g., fewer power outages) and reducing utilities’ operating costs (e.g., by eliminating meter reading). Much of the buzz around the smart grid, however, has to do with the ways that smart grid technology can facilitate greenhouse gas emission reductions.

Efficiency, renewables, and  plug-in hybrid electric vehicles (PHEV) are three of the primary climate solutions the smart grid can enable. Initial evidence suggests that giving consumers direct feedback on their electricity use via smart meters and associated display devices can by itself lead to energy savings of 5-15 percent. One of the challenges that will become increasingly important as the United States relies more on renewable electricity from wind and solar power is that these resources are variable (i.e., they only generate electricity when the wind blows or the sun shines) rather than schedulable like traditional fossil fuel power plants. Smart grid technology makes it easier to add energy storage to the grid and to exploit demand response (e.g., cycling air conditioners on and off) to more easily balance electricity supply and demand as output from variable renewables fluctuates. Finally, smart grid technology would facilitate charging PHEVs during periods of low electricity demand (when generating costs are lowest and existing capacity is underutilized) so that PHEV charging can be done most cost-effectively.

Achieving greenhouse gas emission reductions at the lowest cost will require deploying a portfolio of energy efficiency measures and low-carbon energy technologies, several of which can build upon smart grid technology.

Steve Caldwell is a Technology and Policy Fellow

Embracing a Cleaner Coal Future

The role of coal in the future U.S. energy mix is a key issue in the Senate debate over climate legislation. Another senator has recently drawn attention to the importance of carbon capture and storage (CCS) technology to coal. On December 3, Senator Robert Byrd (D-WV) issued an opinion piece entitled “Coal Must Embrace the Future.”

West Virginia produces more coal than any state other than Wyoming and accounts for about 13.5 percent of total U.S. coal production. Coal-fueled power plants provide nearly 98 percent of West Virginia’s electricity. Coal mining accounts for about 6 percent of West Virginia’s state GDP and 3 percent of total state employment.

Senator Byrd’s opinion piece addresses issues related to mountaintop removal mining and climate change. Notably, on the question of climate change, Senator Byrd writes that:

To be part of any solution, one must first acknowledge a problem. To deny the mounting science of climate change is to stick our heads in the sand and say “deal me out.” West Virginia would be much smarter to stay at the table. The 20 coal-producing states together hold some powerful political cards.

Disinterested analyses (e.g, from MIT and EPRI) project coal with CCS to be a significant component of a least-cost portfolio of low-carbon energy technologies.  Coal currently provides nearly half of all U.S. electricity. Senator Byrd’s opinion piece reinforces the distinct importance of preserving a significant role for coal in a future U.S. energy supply in order to secure broad political support (i.e., at least 60 votes in the Senate) for action on climate change.

Senator Byrd earlier stated that he did not support the climate and energy bill passed by the House in June (H.R. 2454, the American Clean Energy and Security Act of 2009) “in its present form.” Our recent brief describes the significant investments the House energy and climate bill includes for demonstration and deployment of CCS with coal-fueled power plants. The senator does, however, highlight in his opinion piece that he has been working for the past six months with a group of coal state senators on provisions that could be included in a Senate climate and energy bill that would facilitate a transition to a low-carbon energy future for the coal industry.

In short, Senator Byrd’s opinion piece is a candid assessment of the situation as he sees it: the science supporting man-made climate change is clear; U.S. climate and energy legislation will pass eventually; cooperative, constructive engagement by coal state Senators in crafting such legislation is the best strategy for protecting the interests of their constituents.

Fittingly, one of the most advanced CCS projects in the world recently began operation in Senator Byrd’s home state—American Electric Power’s Mountaineer Plant Carbon Dioxide Capture & Storage Project.

Steve Caldwell is a Technology and Policy Fellow

Dorgan Delves Deeper into CCS

Not surprisingly, Senator Byron Dorgan (D-ND) is interested in carbon capture and storage (CCS) and its application to coal-fueled electricity generation. North Dakota gets almost 90 percent of its electricity from coal, and the state is the 10th largest producer of coal in the United States.

In mid-2008, Senator Dorgan convened a group of stakeholders with interest in CCS under the banner of a “Clean Coal and Carbon Capture and Sequestration Technology Development Pathways Initiative” (CCS Initiative) and asked them to provide input related to a number of key questions regarding CCS. Participants included representatives from the electric power industry, coal industry, manufacturing, labor, academics, and NGOs. The questions posed by the Senator focused on such issues as how much funding for CCS is required to ensure the technology is ready for broad deployment and how the United States can expand its cooperation with other key coal-producing and coal-consuming nations to accelerate international deployment of CCS.

On December 1, Senator Dorgan released a report prepared by the National Energy Technology Laboratory (NETL) that summarized input provided by the CCS Initiative participants.

Providing a Nuclear Boost

This week, Senators Lamar Alexander (R-TN) and Jim Webb (D-VA) released a bill intended, among other things, to dramatically expand the U.S. nuclear reactor fleet and, reportedly, to double the production of nuclear power in the United States by 2020.

In previous blog posts, we have highlighted what proposed climate and energy legislation in the House and Senate does for nuclear power. Many analyses, such as studies by the U.S. Environmental Protection Agency (EPA) and the Energy Information Administration (EIA), agree that the bulk of the most cost-effective initial greenhouse gas (GHG) emission reductions are found in the electricity sector and that nuclear power can play a key role in reducing GHG emissions from electricity generation as part of a portfolio of low-carbon technologies.

Putting a price on carbon, as a GHG cap-and-trade program would do, is likely the best option for expanding nuclear power generation since it makes the cost of electricity from nuclear and other low-carbon technologies more economical compared to traditional fossil fuel technologies. For example, in its analysis of the American Clean Energy and Security Act of 2009 (ACESA) passed by the House of Representatives in June of 2009, EIA projected that nuclear power might provide nearly twice as much electricity in 2030 as it does today.

A key challenge is cost. The construction of much of the existing nuclear fleet saw significant cost overruns and delays, which makes financing the first new plants after a hiatus of several decades difficult. Government loan guarantees can help the first-mover new nuclear power plants overcome the financing challenge. The demonstration of on-budget and on-time construction and operation by these first movers would facilitate commercial financing of subsequent plants.

Could the U.S. undertake a very large expansion of nuclear power? Nuclear power plants are massive undertakings, and a typical plant might cost on the order of $6 billion dollars and take 9-10 years to build from licensing through construction. Nonetheless, 17 applications for construction and operating licenses (COLs) for 26 new reactors are under review by the Nuclear Regulatory Commission (NRC)—all submitted since 2007. One can also look at the historical pace of nuclear power deployment in the United States for a sense of what might be reasonable once the nuclear industry ramps up. More than a third of the 100 gigawatts (GW) of nuclear generating capacity that provides a fifth of U.S. electricity came online in 1971-75, and more than 90 GW of U.S. nuclear power came online in the 1970s and 1980s.

One can see that putting a price on carbon, via cap and trade, will likely spur a significant expansion in U.S. nuclear power over the coming decades (as part of a portfolio of low-carbon technologies) facilitated by loan guarantees to support a few first-mover projects.

Steve Caldwell is a Technology and Policy Fellow

Towards a Climate-Friendly Built Environment

Buildings Cover

Towards a Climate-Friendly Built Environment

Prepared for the Pew Center on Global Climate Change
June 2005

By:
Marilyn Brown, Oak Ridge National Laboratory
Frank Southworth, Oak Ridge National Laboratory
Therese Stovall, Oak Ridge National Laboratory

Press Release

Download Report (pdf)

Read the In-Brief summarizing this report

Foreword

Eileen Claussen, President, Pew Center on Global Climate Change

Buildings in the United States – homes, offices, and industrial facilities – account for over 40 percent of our nation's carbon dioxide emissions. Most of these emissions come from the combustion of fossil fuels to provide heating, cooling, and lighting and to run electrical equipment and appliances. The manufacture of building materials and products, and the increased emissions from the transportation generated by urban sprawl, also contribute a significant amount of greenhouse gas (GHG) emissions every year. In this report, authors Marilyn Brown, Frank Southworth, and Theresa Stovall identify numerous opportunities available now, and in the future, to reduce the building sector's overall impact on climate. 

This Pew Center report is part of our effort to examine key sectors, technologies, and policy options to construct the "10-50 Solution" to climate change. The idea is that we need to tackle climate change over the next fifty years, one decade at a time. Looking at options for the near (10 years) and long (50 years) term, this report yields the following insights for reducing GHG emissions from the largest portion of our nation's physical wealth – our built environment.

  • This sector presents tremendous challenges. There are so many different energy end uses and GHG-relevant features, multiple stakeholders and decision-makers, and numerous market barriers to energy efficiency.
  • Yet numerous opportunities exist. In the near term, simply bringing current building practices up to the level of best practices would yield tremendous energy and cost savings. Past studies have shown that many climate-friendly and cost-effective measures in the buildings sector are not fully utilized in the absence of policy intervention. The R&D and six deployment policies examined in this report could reduce forecasted energy consumption and carbon emissions of buildings in the United States in 2025 by almost one-quarter, or by an amount roughly equal to 10% of total projected U.S. carbon emissions. In 2025 and beyond, newly constructed net-zero-energy homes and climate-friendly designs for large commercial buildings and industrial facilities could begin to generate sizeable GHG reductions by displacing the energy-intensive structures that embody today's standard practices.
  • An integrated approach is needed to reduce GHG emissions from the diverse and fragmented building sector. Such an approach coordinates across technical and policy solutions, integrates engineering approaches with architectural design, considers design decisions within the realities of building operation, integrates green building with smart-growth concepts, and takes into account the numerous decision-makers within the industry.
  • An expansive view of the building sector is needed to completely identify and capitalize on the full range of GHG-reduction opportunities. Such a view needs to consider future building construction (including life-cycle aspects of buildings materials, design, and demolition), use (including on-site power generation and its interface with the electric grid), and location (in terms of urban densities and access to employment and services).

The authors and the Pew Center would like to thank Robert Broad of Pulte Home Sciences, Leon Clarke of the Pacific Northwest Laboratory, Jean Lupinacci of the U.S. Environmental Protection Agency, and Steven Nadel of the American Council for an Energy Efficient Economy for their review of and advice on a previous draft of this report, and Tony Schaffhaeuser for contributions to an early version this paper.

Executive Summary

The energy services required by residential, commercial, and industrial buildings produce approximately 43 percent of U.S. carbon dioxide (CO2) emissions. Given the magnitude of this statistic, many assessments of greenhouse gas (GHG) reduction opportunities focus principally on technologies and policies that promote the more efficient use of energy in buildings. This report expands on this view and includes the effects of alternative urban designs; the potential for on-site power generation; and the life-cycle GHG emissions from building construction, materials, and equipment. This broader perspective leads to the conclusion that any U.S. climate change strategy must consider not only how buildings in the future are to be constructed and used, but also how they will interface with the electric grid and where they will be located in terms of urban densities and access to employment and services. The report considers both near-term strategies for reducing GHGs from the current building stock as well as longer-term strategies for buildings and communities yet to be constructed.

The United States has made remarkable progress in reducing the energy and carbon intensity of its building stock and operations. Energy use in buildings since 1972 has increased at less than half the rate of growth of the nation's gross domestic product, despite the growth in home size and building energy services such as air conditioning and consumer and office electronic equipment. Although great strides have been made, abundant untapped opportunities still exist for further reductions in energy use and emissions. Many of these-especially energy-efficient building designs and equipment-would require only modest levels of investment and would provide quick pay-back to consumers through reduced energy bills. By exploiting these opportunities, the United States could have a more competitive economy, cleaner air, lower GHG emissions, and greater energy security.

GHG Emissions: Sources and Trends

GHG emissions from the building sector in the United States have been increasing at almost 2 percent per year since 1990, and CO2 emissions from residential and commercial buildings are expected to continue to increase at a rate of 1.4 percent annually through 2025. These emissions come principally from the generation and transmission of electricity used in buildings, which account for 71 percent of the total. Due to the increase in products that run on electricity, emissions from electricity are expected to grow more rapidly than emissions from other fuels used in buildings. In contrast, direct combustion of natural gas (e.g., in furnaces and water heaters) accounts for about 20 percent of energy-related emissions in buildings, and fuel-oil heating in the Northeast and Midwest accounts for the majority of the remaining energy-related emissions. Based on energy usage, opportunities to reduce GHG emissions appear to be most significant for space heating, air conditioning, lighting, and water heating.

Mechanisms of Change

Because the building industry is fragmented, the challenges of promoting climate-friendly actions are distinct from those in transportation, manufacturing, and power generation. The multiple stakeholders and decision-makers in the building industry and their interactions are relevant to the design of effective policy interventions. Major obstacles to energy efficiency exist, including insufficient and imperfect information, distortions in capital markets, and split incentives that result when intermediaries are involved in the purchase of low-GHG technologies. Many buildings are occupied by a succession of temporary owners or renters, each unwilling to make long-term improvements that would mostly benefit future occupants. Regulations, fee structures in building design and engineering, electricity pricing practices, and the often limited availability of climate-friendly technologies and products all affect the ability to bring GHG-reducing technologies into general use. Some of these obstacles are market imperfections that justify policy intervention. Others are characteristics of well-functioning markets that simply work against the selection of low-GHG choices.

Numerous individual, corporate, community, and state initiatives are leading the implementation of "green" building practices in new residential development and commercial construction. The most impressive progress in residential green building development and construction is the result of communities and developers wanting to distinguish themselves as leaders in the efficient use of resources and in waste reduction in response to local issues of land-use planning, energy supply, air quality, landfill constraints, and water resources. Building owners and operators who have a stake in considering the full life-cycle cost and resource aspects of their new projects are now providing green building leadership in the commercial sector. However, real market transformation will also require buy-in from the supply side of the industry (e.g., developers, builders, and architects).

Affordability, aesthetics, and usefulness have traditionally been major drivers of building construction, occupancy, and renovation. In addition to climatic conditions, the drivers for energy efficiency and low-GHG energy resources depend heavily on local and regional energy supply costs and constraints. Other drivers for low-GHG buildings are clean air, occupant health and productivity, the costs of urban sprawl, electric reliability, and the growing need to reduce U.S. dependence on petroleum fuels.

Technology Opportunities in Major Building Subsectors

The technical and economic potential is considerable for technologies, building practices, and consumer actions to reduce GHG emissions in buildings. When studying the range of technologies, it is important to consider the entire building system and to evaluate the interactions between the technologies. Thus, improved techniques for integrated building analyses and new technologies that optimize the overall building system are especially important. In this report, homes and small commercial buildings and large commercial and industrial buildings are analyzed separately for their energy-saving and emission-reduction potential, because energy use in homes and small businesses is principally a function of climatic conditions while energy use in large buildings is more dependent on internal loads. 

Applying currently available technologies can cost-effectively save 30 to 40 percent of energy use and GHG emissions in new buildings, when evaluated on a life-cycle basis. Technology opportunities are more limited for the existing building stock, and the implementation rate depends on the replacement cycles for building equipment and components. However, several opportunities worth noting apply to existing as well as new buildings, including efficiencies in roofing, lighting, home heating and cooling, and appliances. Emerging building technologies, especially new lighting systems and integrated thermal and power systems, could lead to further cost-effective energy savings. All of these potential effects, however, are contingent upon policy interventions to overcome the barriers to change.

Community and Urban Subsystems

Evidence suggests that higher-density, more spatially compact and mixed-use building developments can offer significant reductions in GHG emissions through three complementary effects: (1) reduced vehicle miles of travel, (2) reduced consumption for space conditioning as a result of district and integrated energy systems, and (3) reduced municipal infrastructure requirements. Both behavioral and institutional barriers to changes in urban form are significant. The effect of urban re-design on travel and municipal energy systems will need to be tied to important developments in travel pricing, transportation construction, and other infrastructure investment policies.

Past studies have concluded conservatively that changes in land-use patterns may reduce vehicle miles traveled by 5 to 12 percent by mid-century. More compact urban development could also lead to comparable GHG reductions from efficiencies brought about by district and integrated energy systems, with a small additional decrement from a reduced need for supporting municipal infrastructures. In total, therefore, GHG reductions of as much as 3 to 8 percent may be feasible by mid-century, subject to the near-term enactment of progressive land-use planning policies.

Policy Options

Policy research suggests that public interventions could overcome many of the market failures and barriers hindering widespread penetration of climate-friendly technologies and practices. The mosaic of current policies affecting the building sector is complex and dynamic, ranging from local, state, and regional initiatives, to a diverse portfolio of federal initiatives. Numerous policy innovations could be added to this mix, and many are being tried in test-beds at the state and local level.

In this report, buildings energy research and development (R&D) and six deployment policies are reviewed that have a documented track record of delivering cost-effective GHG reductions and that hold promise for continuing to transform markets.   The six deployment policies include (1) state and local building codes, (2) federal appliance and equipment efficiency standards, (3) utility-based financial incentive and public benefits programs, (4) the low-income Weatherization Assistance Program, (5) the ENERGY STAR(r) Program, and (6) the Federal Energy Management Program. Annual energy savings and carbon-reduction estimates are provided for each of these policies, both retrospectively and prospectively. Summing these values provides a reasonable estimate of the past and potential future impacts of the policies.

Annual savings over the past several years from these R&D and six deployment policies are estimated to be approximately 3.4 quadrillion Btu (quads) and 65 million metric tons of carbon (MMTC), representing 10 percent of U.S. CO2 emissions from buildings in 2002. The largest contributors are appliance standards and the ENERGY STAR Program. Potential annual effects in the 2020 to 2025 time frame are 12 quads saved and 200 MMTC avoided, representing 23 percent of the forecasted energy consumption and carbon emissions of buildings in the United States by 2025. The largest contributors are federal funding for buildings energy R&D (especially solid-state lighting) and appliance standards.

Conclusions and Recommendations

The analysis presented in this report leads to several conclusions:

  • An expansive view of the building sector is needed to completely identify and exploit the full range of GHG-reduction opportunities. Such a view needs to consider future building construction (including life-cycle aspects of buildings materials, design, and demolition), use (including on-site power generation and its interface with the electric grid), and location (in terms of urban densities and access to employment and services).
  • There is no silver bullet technology in the building sector because there are so many different energy end uses and GHG-relevant features. Hence, a vision for the building sector must be seen as a broad effort across a range of technologies and purposes.
  • An integrated approach is needed to address GHG emissions from the U.S. building sector - one that coordinates across technical and policy solutions, integrates engineering approaches with architectural design, considers design decisions within the realities of building operation, integrates green building with smart-growth concepts, and takes into account the numerous decision-makers within the fragmented building industry.
  • Current building practices seriously lag best practices. Thus, vigorous market transformation and deployment programs are critical to success. They are also necessary to ensure that the next generation of low-GHG innovations is rapidly and extensively adopted.
  • Given the durable nature of buildings, the potential for GHG reductions resides mostly with the existing building stock for some time to come. However, by 2025, newly constructed net-zero-energy homes and climate-friendly designs for large commercial buildings and industrial facilities could begin to generate sizeable GHG reductions by displacing the energy-intensive structures that embody today's standard practices. By mid-century, land-use policies could have an equally significant impact on GHG emissions. This inter-temporal phasing of impacts does not mean that retrofit, new construction, and land-use policies should be staged; to achieve significant GHG reductions by 2050, all three types of policies must be strengthened as soon as politically feasible.
  • Similarly, applied R&D will lead to GHG reductions in the short run, while in the long run basic research will produce new, ultra-low GHG technologies. This does not mean that basic research should be delayed while applied R&D opportunities are exploited. The pipeline of technology options must be continuously replenished by an ongoing program of both applied and basic research.

By linking near-term action to long-term potential, the building sector can assume a leadership role in reducing GHG emissions in the United States and globally.

Conclusions

The energy services required by residential, commercial and industrial buildings produce approximately 43% of U.S. CO2 emissions. Additional GHG emissions result from the manufacture of building materials and products, the transport of construction and demolition materials, and the increased passenger and freight transportation associated with urban sprawl. As a result, an effective U.S. climate change strategy must consider options for reducing the GHG emissions associated with how buildings are constructed, used, and located.

Homes, offices, and factories rarely incorporate the full complement of cost-effective climate-friendly technologies and smart growth principles, despite the sizeable costs that inefficient and environmentally insensitive designs impose on consumers and the nation. To significantly reduce GHG emissions from the building sector, an integrated approach is needed-one that coordinates across technical and policy solutions, integrating engineering approaches with architectural design, considering design decisions within the realities of building operation, integrating green building with smart-growth concepts, and taking into account the timing of policy impacts and technology advances.

A. Technology Opportunities in the 2005 to 2025 Time Frame

In the short run, numerous green products and technologies could significantly reduce GHG emissions from buildings, assuming vigorous encouragement from market-transforming policies such as expanded versions of the six deployment policies studied here. In the coming decade, given the durable nature of buildings, the potential for GHG reductions resides mostly with the existing building stock and existing technologies. Some of the numerous promising off-the-shelf technologies and practices outlined in this report include reflective roof products, low-E coating for windows, the salvage and reuse of materials from demolished buildings, natural ventilation and air conditioning systems that separately manage latent and sensible heat, smart HVAC control systems, and variable speed air handlers.

Federally funded R&D for energy savings in buildings must also be expanded in the short term so that an attractive portfolio of new and improved technological solutions will be available in the mid and long term. Achieving the goal of a cost-competitive net-zero-energy home by 2020, for example, will require scientific breakthroughs to be incorporated into new and improved photovoltaic systems, power electronics, thermochemical devices, phase-change insulation and roofing materials, and other components. In addition, policies that promote higher-density, spatially compact, and mixed-use building developments must begin to counteract the fuel-inefficient impact of urban sprawl.

In the 2025 timeframe, newly constructed net-zero-energy homes and climate-friendly designs for large commercial buildings and industrial facilities will need to begin to displace the GHG-intensive structures that embody today's standard practices. The emerging technologies described in this report could help significantly reduce GHG emissions from the building sector including

  • sealing methods that address unseen air leaks,
  • electrochromic windows offering the dynamic control of infrared energy,
  • unconventional water heaters (solar, heat pump, gas condensing, and tankless),
  • inexpensive highly efficient nanocomposite materials for solar energy conversion,
  • thermoelectric materials that can transform heat directly into electrical energy,
  • solid state lighting that uses the emission of semi-conductor diodes to directly produce light at a fraction of the energy of current fluorescent lighting,
  • selective water sorbent technologies that offer the performance of ground-coupled heat pumps at the cost of traditional systems,
  • abundant sensors dispersed through buildings with continuously optimizing control devices, and
  • 80-90 percent efficient integrated energy systems that provide on-site power as well as heating, cooling, and dehumidification.

Market transformation policies are expected to continue to improve the existing building stock and play an essential role in ensuring the market uptake of new technologies. In addition, land-use policies could begin to have measurable benefits.

The analysis reported here suggests that six expanded market transformation policies-in combination with invigorated R&D-could bring energy consumption and carbon emissions in the building sector in 2025 back almost to 2004 levels. At the same time, the built environment will be meeting the needs of an economy (and associated homes, offices, hospitals, restaurants, and factories) that will have grown from $9.4 trillion in 2002 to $18.5 trillion in 2025.

B. Building Green and Smart in the 2050 Time Frame

Green building practices and smart growth policies could transform the built environment by mid-century. Some of the climate-friendly features of this transformed landscape that are outlined in this report include:

  • building efficiency measures that dramatically reduce the energy requirements of buildings;
  • high-performance photovoltaic panels, fuel cells, microturbines and other on-site equipment that produce more electricity and thermal energy than is required locally, making buildings net exporters of energy, thereby transforming the entire demand and supply chain in terms of energy generation, distribution, and end use;
  • higher-density communities that enable high-efficiency district heating and cooling;
  • gridded street plans and other compact and readily accessible local street systems that also enable mass transit, and pedestrian and cyclist-friendly pathways to displace other forms of travel;
  • parks and tree-lined streets to act as carbon sinks and to mitigate the "heat island" effect; and
  • in-fill and mixed-use land development to shorten trip distances while reducing infrastructure requirements.

In the long run, improving the locational efficiency of communities and urban systems could possibly have as large an impact on GHG emissions as improving the design, construction, and operation of individual structures.

C. Linking Near-Term Action with Long-Term Potential

Given the durable nature of buildings, the potential for GHG reductions resides mostly with the existing building stock for some time to come. However, by 2025, newly constructed net-zero-energy homes and climate-friendly designs for large commercial buildings and industrial facilities could begin to generate sizeable GHG reductions by displacing the energy-intensive structures that embody today's standard practices. By mid-century, land-use policies could also significantly reduce GHG emissions. This inter-temporal phasing of impacts does not mean that retrofit versus new construction versus land-use policies should be staged; to achieve significant GHG reductions by 2050, all three elements of an integrated policy approach must be strengthened in the near term.

Similarly, applied R&D will lead to GHG reductions in the short run, while basic research will take longer to produce new, ultra-low GHG technologies. This does not mean that fundamental research should be delayed while applied R&D opportunities are exploited. The pipeline of technology options must be continuously replenished by an ongoing program of both applied and basic research. Vigorous market transformation and deployment programs will be needed throughout the coming decades to shrink the existing technology gap and to ensure that the next generation of low-GHG innovations is rapidly adopted.

By linking near-term action with long-term potential in an expansive and integrated framework, the building sector can be propelled to a leadership role in reducing GHG emissions in the United States and globally.

Frank Southworth
Marilyn Brown
Therese Stovall
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