If you use solar energy and energy efficient lighting, cooking or heating, you may be qualified for tax and rebate incentives.

I will list anything here that may be helpful. Please feel free to contribute to this page.

Here is a link to the database of state incentives for renewables & efficiency:

http://www.dsireusa.org/

You may be able to purchase you solar items tax free and also get up to 30% of your investment offset by the government.