The New York State Energy Research and Development Authority has released for stakeholder comment a draft report which claims that annual carbon dioxide (CO2) emissions from electricity generators in the 10 states participating in the Regional Greenhouse Gas Initiative (RGGI) were 33 percent lower in 2009 than in 2005. According to the November 2, 2010, white paper, total CO2 emissions declined from 184.4 million tons in 2005, when the RGGI program was designed, to 123.7 million tons in 2009, when RGGI was implemented.

The report credits a decline of 29.2 million tons with a reduced electricity load due to weather, energy-efficiency programs, customer-sited generation, and the economy. It attributes a decline of 18.9 million tons to fuel-switching due to lower natural gas prices, and a decline of 12.6 million tons to greater use of nuclear, wind and hydropower, and less use of coal. The RGGI states are Connecticut, Delaware, Maine, Maryland, Massachusetts, New Hampshire, New Jersey, New York, Rhode Island, and Vermont.