Two Danish-owned companies are working to commercially produce cellulosic ethanol, aiming to make it available for $2 a gallon. Cellulosic ethanol can be produced from fast-growing grasses, holds five times more net energy than corn-based ethanol and has manufacturing boilers that can run on plant waste from their own processes, unlike natural gas-powered corn-ethanol plants. The Energy Independence and Security Act of 2007 has earmarked 16 billion of the 36 billion gallons of biofuels to be produced in the U.S. by 2022 for cellulosic ethanol.

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