The Obama Administration’s signature effort to abate greenhouse gases (GHGs) that contribute to climate change was its Clean Power Plan (CPP), an innovative approach to reining in GHGs from existing fossil fuel-fired power plants, the US’s largest source of stationary source emissions. The CPP never went into effect, however, the victim of an unusual stay issued by the United States Supreme Court before its effective date. Subsequently, a lower court halted the litigation attacking the CPP at the request of the Trump Administration to allow it to review (and presumably repeal) the CPP and put its own stamp on climate policy. This article discusses the review process the US Environmental Protection Agency has embarked upon, its potential outcome, and the extent to which regulatory policies and market considerations are likely to shape GHG emissions from the US electric power sector in the foreseeable future.