[djchen]

In California we have this as well. PG&E (SF Bay Area) calls it Solar Choice, SCE (SoCal area) calls it Green Rates, and SDG&E (San Diego area) calls it EcoChoice. You can choose between 50% or 100% renewable energy and are charged a premium per kWh used.

I bet many other states in the US have this as well.

[makerofspoons]

Metro Denver definitely has this through Xcel Energy. I'm enrolled in a program called Wind Source and I believe there is a similar program for solar.