The Oregon Department of Revenue has begun an online auction of $1.5 million in tax credits to fund grants for renewable energy projects. Ending November 4, 2011, the auction is the result of legislative revisions to the state’s tax credit programs that included some sunsets. The agency will auction 1,500 tax credit certificates worth $1,000 each for the current tax year. Unused credits may be carried over for up to three years. Eligible renewable projects for grant funds include solar, biomass, geothermal, hydropower, wind, landfill gas, and ocean energy.