"We take a first look at limitations on the use of energy-related tax credits contained in the General Business Credit (GBC) due to limitations within the regular corporate income tax as well as the AMT. Between 2000 and 2005, firms were unable to use all energy-related tax credits due to GBC...

"Tax expenditures are a major source of support for energy related activities in the federal budget exceeding direct budget support for energy by a factor of nearly six. Focusing on the policy goals of reducing greenhouse gas emissions and petroleum consumption, I find these tax expenditures...