The Regional Greenhouse Gas Initiative is a regional initiative by states and provinces in the Northeastern United States and Eastern Canada regions to reduce greenhouse gas emissions. The RGGI is designing a cap and trade program for greenhouse gas emissions from power plants. RGGI is a cooperative effort among nine Northeastern and Mid-Atlantic States to reduce carbon dioxide emissions from the electric power sector through coordinated state cap and trade programs.
Nine states currently participate in the initiative: Connecticut, Delaware, Maine, Maryland, Massachusetts, New Hampshire, New York, Rhode Island, and Vermont. Several states and Canadian provinces act as observers: Pennsylvania, Québec, New Brunswick, and Ontario.
RGGI is a cap-and-trade system for CO2 emissions from power plants in the member states. Emission permit auctioning began in September 2008, and the first three-year compliance period began on January 1, 2009. Proceeds are used to promote energy conservation and renewable energy.