Why it Matters
Greenhouse gas (GHG) emissions from the generation of electricity by fossil fuel-fired power plants, or electric generating units (EGUs), makes up roughly 25% of US total GHG emissions. Reducing GHG emissions from power plants is an important step in achieving US GHG emissions reductions, especially as other sectors look to reduce emissions through electrification.

Greenhouse Gas Standards for New Sources
For new, modified, or reconstructed power plants, EPA promulgates regulations under the Clean Air Act’s (CAA) New Source Performance Standards for Greenhouse Gas Emissions (section 111(b)). The CAA defines new sources as those constructed after the proposed regulation’s publication date.

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