Incentives

Typically, at least half of the cost of a PV system gets subsidized by government entities.  The Federal Government and many of the states offer incentives to encourage the adoption of various renewable energy technologies and conservation measures.

DSIRE is a comprehensive source of information on state, local, utility, and federal incentives that promote renewable energy and energy efficiency.

Here are a few of the programs of interest.

Federal Residential Renewable Energy Tax Credit of 30% for Solar Water Heat, Photovoltaics, Wind, Fuel Cells, Geothermal Heat Pumps, Other Solar Electric Technologies.  There is no maximum amount.  The program expires 12/31/2016.  See the following link for more details.

The Pennsylvania Alternative Energy Investment Act, Act of July 9, 2008 provides rebates of up to 35% for Photo Voltaic projects.   Check with your vendor for the status of the program before committing to a project

For a list of the current Pennsylvania Incentives for Renewables and Efficiency

Delaware has grants up to 50%.  

 Also see http://www.dsireusa.org/library/includes/map2.cfm?CurrentPageID=1&State=DE