Million Solar Roofs

Million Solar Roofs
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Name	Million Solar Roofs
Country	United States
Launched	1997
Agency	United States Department of Energy; Environmental Protection Agency
Partners	Solar Energy Industries Association; National Renewable Energy Laboratory; Lawrence Berkeley National Laboratory; State of California; State of New York
Status	completed/ongoing legacy

Million Solar Roofs

Million Solar Roofs was a United States federal initiative to accelerate adoption of rooftop photovoltaic and solar thermal systems through coordination among agencies, utilities, industry, and state programs. It aimed to deploy widespread distributed generation across residences, businesses, and public buildings by leveraging federal programs, industry partners, and state policies to lower barriers to adoption. The initiative intersected with major energy, environmental, and regulatory actors in Washington, regional laboratories, and market groups shaping early 21st-century solar deployment.

Background and Objectives

The initiative was motivated by concerns addressed by United States Department of Energy, Environmental Protection Agency, National Renewable Energy Laboratory, Lawrence Berkeley National Laboratory, Energy Policy Act of 1992, American Recovery and Reinvestment Act of 2009, and regional utilities such as Pacific Gas and Electric Company, San Diego Gas & Electric, and Con Edison. Objectives included accelerating deployment modeled after programs like California Solar Initiative, New Jersey Board of Public Utilities, and Connecticut Clean Energy Finance and Investment Authority to reach targets similar to those discussed in reports by Rocky Mountain Institute, Electric Power Research Institute, and International Energy Agency. Goals included fostering markets analogous to incentives seen in Germany, Spain, and the United Kingdom feed-in environments, while coordinating stakeholders including Solar Energy Industries Association, Sierra Club, Natural Resources Defense Council, Union of Concerned Scientists, and state regulators such as the California Public Utilities Commission.

Program History and Implementation

The program launched in the late 1990s with milestones tied to federal policy debates in the United States Congress, signature programs at DOE and partnerships with laboratories including Sandia National Laboratories, Brookhaven National Laboratory, and Argonne National Laboratory. Implementation involved coordination with state programs like California Solar Initiative, municipal programs in Los Angeles and New York City, utility pilots with Iberdrola USA affiliates, and incentive mechanisms similar to feed-in tariffs used in Germany and Japan. Early pilot projects referenced demonstration sites at National Renewable Energy Laboratory and research collaborations with universities such as Massachusetts Institute of Technology, Stanford University, University of California, Berkeley, University of Colorado Boulder, and Georgia Institute of Technology.

Funding and Incentives

Funding streams combined federal appropriations overseen by United States Department of Energy, grants from Environmental Protection Agency programs, tax incentives like the federal solar Investment Tax Credit, and state-level rebates such as those administered by California Solar Initiative and New Jersey Board of Public Utilities. Public–private financing drew on models from KfW-style loan programs in Germany and green bank concepts promoted by Connecticut Green Bank and New York Green Bank. Utilities offered net metering arrangements debated before regulators like the Federal Energy Regulatory Commission and state public utilities commissions. Philanthropic partners such as the Rockefeller Foundation and corporate actors including SunPower Corporation, First Solar, SunEdison, Sunnova, and Tesla, Inc. played roles in commercial deployment financing.

Technology and Deployment

Deployment focused on rooftop photovoltaic modules manufactured by companies like First Solar, SunPower Corporation, Sharp Corporation, General Electric, and Panasonic Corporation alongside concentrated efforts on solar thermal systems promoted by Viessmann and Rheem. Research and testing incorporated work at National Renewable Energy Laboratory, Sandia National Laboratories, and academia including Stanford University and Massachusetts Institute of Technology. Balance-of-system components from inverter manufacturers such as SMA Solar Technology and Enphase Energy and mounting systems from firms like Unirac were integral. Integration with smart grid pilots referenced projects by Pacific Gas and Electric Company, Southern California Edison, Austin Energy, and technologies tied to standards bodies like Underwriters Laboratories and Institute of Electrical and Electronics Engineers.

Economic and Environmental Impacts

Analyses by Lawrence Berkeley National Laboratory, National Renewable Energy Laboratory, Brookings Institution, and Resources for the Future assessed job impacts referencing employment data from Bureau of Labor Statistics and industry reports by Solar Energy Industries Association. Environmental assessments cited emissions reductions aligned with analyses by Intergovernmental Panel on Climate Change, United Nations Environment Programme, and Environmental Protection Agency inventories. Local economic development effects were compared with manufacturing trends involving firms such as First Solar and SolarCity and supply-chain impacts studied by Oak Ridge National Laboratory. Grid integration impacts referenced work by Federal Energy Regulatory Commission staff and regional transmission organizations like PJM Interconnection and California Independent System Operator.

Criticism and Challenges

Criticism came from stakeholders including some utilities (for example Duke Energy and PG&E debates), regulated ratepayer advocates before bodies like the California Public Utilities Commission, and policy analysts at Heritage Foundation and American Enterprise Institute concerned about subsidy design. Challenges included soft costs documented by Lawrence Berkeley National Laboratory, permitting barriers discussed by International Energy Agency, and manufacturing competition with China-based firms such as JinkoSolar and Trina Solar. Grid stability concerns were raised in studies by National Renewable Energy Laboratory and Michigan Public Service Commission-level proceedings. Legal and regulatory disputes appeared before courts including United States Court of Appeals for the Ninth Circuit and state supreme courts.

Legacy and Influence on Policy

The initiative influenced subsequent federal and state programs, informing elements of the American Recovery and Reinvestment Act of 2009, federal tax policy like the Investment Tax Credit (United States), and state programs such as California Solar Initiative expansions and New York's Reforming the Energy Vision. It shaped market structures used by companies like SolarCity, Sunrun, and Vivint Solar and informed reporting frameworks at National Renewable Energy Laboratory and Lawrence Berkeley National Laboratory. Internationally, lessons informed policy discussions at the International Energy Agency and in national strategies in Germany, China, India, and Australia. Its legacy persists in modern distributed generation debates before Federal Energy Regulatory Commission and state public utilities commissions.

Category:Solar power in the United States