What company(ies) will be able to retrofit gas stations to serve alternative energies?

I have a feeling that as alternative energy becomes a bigger deal, existing gasoline stations will be retrofitted with solar panels, capacitor and battery banks, natural gas tanks, and hydrogen fuels. This is a much more efficient alternative to building brand new fueling stations. What companies are prepared to do the retrofitting?
Well, what I foresee in the immediate future is a lot of competing technologies in the alternative sector. This can already be seen with California giving grants to Pearson Fuels to create E85 stations, India giving contracts for Hythane fueling stations, etc. I would also say that installing solar panels at actual fueling stations will likely occur to some extent, because it will be more profitable to produce the electricity privately (rather than purchase it).