Thanks to Tammy’s blog, I found RealGoods.com. From the site: At Real Goods, we’ve been selling solar since 1978, when the price was well over $300 per watt or more than $6 per kWh (kilowatt-hour).

Today, with State of California incentives, that $6 per kWh cost has come down to around $.12/kWh, a 98% drop in only 24 years! What this means for you is that you’ll be guaranteeing yourself an electrical rate of $.12/kWh for the next 30 years, over which time we all know electrical rates from the utilities will be sharply increasing.

http://www.realgoods.com/calsolar/economics.html