Some numbers: There are 24 U.S. programs that support biofuels, mostly ethanol and biodiesel. They were established over the last 28 years and are administered by five government agencies: Environmental Protection, Agriculture, Energy, IRS, and Customs and Border Protection.
If policy drives business, it looks like there are 101 reasons to develop cellulosic biofuels (from plant waste rather than people food). There’s a $1.01 per gallon credit from the IRS for producers.
The appendix has a summary by agency. Something to chew on.
The Pew Center also has a guide to state incentives.
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