The IRS has an advance proof copy available of the form needed by homeowners to receive a 30% tax credit
on a solar power system purchased in 2009 on their primary residence. Form 5695 for “Residential Energy Credits” can be found here: http://www.irs.gov/app/vita/globalmedia/5695.pdf
The tax credit is eligible for “expenditure for property which uses solar energy to generate electricity for use in a dwelling unit located in the United States and used as a residence by the taxpayer.” Please see your accountant or financial advisor for financial and tax information.
Additional source links:
Tax code information can be found here.