Cutting power sector emissions is not new at the state level. According to the 2011 U.S. data available through CAIT 2.0, 42 states reduced their emissions relative to 2005, the baseline used in the U.S. GHG reduction pledge. The graph above shows the 10 states with the most significant reductions. All of them reduced their power sector GHG emissions by more than 30 percent in just six years. Many of these states are also part of the Regional Greenhouse Gas Initiative, a cooperative market-based program to reduce emissions.