Changes

Photovoltaic power is electricity generated by photovoltaic or "solar" cells, which convert light energy from the sun into electrical energy. Solar cells have come a long way, both in efficiency and cost, and are an increasingly viable and common way to offset electricity use[http://www.reuters.com/article/pressRelease/idUS79707+21-Aug-2008+PRN20080821 1]and are an increasingly viable and common way to offset electricity use, both domestic and commercial[http://www.reuters.com/article/GCA-GreenBusiness/idUSTRE52J5VW20090320 2]. The key drawback in solar energy generation is that when the sun goes down, there is no new energy created. As such, it's use is dependent on storage of energy for use during the night. However, as one article points out, it is very good at generating power during sunny days, when air conditioning and heat resistance puts an especially large strain on the power grid. A number of storage options have also been implemented or suggested, ranging from high capacity electric batteries, to compressed air storage to use to turn turbines, to hydrogen generation for use in fuel cells.