I know the subsidies in Colorado for residential solar. I believe that businesses also receive even more subsidies for small commercial installations. The federal government has 30 percent tax credit for PV solar installations. Xcel Energy was forced by voter mandate to provide another 20 to 30 percent investment (rebate to homeowner). Xcel Energy is forced to provide net metering in which excess solar power generated offsets energy used when solar is not producing enough. Xcel Energy is mandated to provide 30 percent renewable power (I believe this mandate is a false claim however) of which residential solar counts towards the mandate. Here is a page with subsidies available in North Carolina.
http://solarpowerrocks.com/tax-credits/solar-cash-new-carolinas-subsidy/
The solar subsidies are a complete boondoggle. PV solar is not economically viable now nor in the projected future except for off grid situations and perhaps other specialized cases.
My town athletic field has solar powered night lights along it's walking/running paths. Each light pole has a 3 sq foot PV collector mounted on it's top. I'm sure these boutique light poles cost a fortune. Would have been much cheaper to wire them the normal way but this way the Democrat hacks got to make their green statement.