The commercial solar tax credit is 30% of the “tax credit basis” (product plus installation, with no upper limit) that a company has invested in “eligible property” that is “put into service”.  Projects put into service from 2009 until the current legislation expires on December 31, 2016 are eligible for the tax credit. Advice of a tax accountant is strongly suggested in determining your eligibility for the commercial solar tax credit.
For projects that commence construction before the end of 2010 (with at least 5% of construction expenditures made), interested persons can apply to receive a treasury grant, in lieu of waiting until the end of the year to apply for the tax credits. Seek the advice of a tax account for more information.
For more information about the Federal Commercial Solar Tax Credit, see page 22 in the Investment and Cost Guide.