This report responds to a request to the Energy Information Administration (EIA) from Chairman Henry Waxman and Chairman Edward Markey for an analysis of H.R. 2454, the American Clean Energy and Security Act of 2009 (ACESA).1 ACESA, as passed by the House of Representatives on June 26, 2009, is a complex bill that regulates emissions of greenhouse gases through market-based mechanisms, efficiency programs, and economic incentives.
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