In a May 8, 2015, letter, Senators Ed Markey (D-MA) and Elizabeth Warren (D-MA) requested that EPA reconsider its decision to treat biomass as having zero emissions under the proposed Clean Power Plan (Plan). The Senators point out "wood-burning power plants emit around 3,000 pounds of carbon dioxide per megawatt-hour," and would not assist in achieving the carbon reductions intended by the Plan. The letter also states: "The EPA should not approve biomass combustion as a compliance method under the Plan until the agency has a method in place to account for facility-level emissions and a means of ensuring that emissions offsetting actually occurs in an appropriate timeframe."

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