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Photovoltaic power is electricity generated by photovoltaic or "solar" cells, which convert light energy from the sun into electrical energy.<ref name="wiki"/>"[http://en.wikipedia.org/wiki/Solar_cell Solar Cell Wikki]," Wikkipedia accessed September 2009</ref> Solar cells have come a long way, both in efficiency and cost,<ref name="masdar"/>"[http://www.reuters.com/article/pressRelease/idUS79707+21-Aug-2008+PRN20080821 Masdar Press Release], Reuters Media Release, August 21, 2008.</ref> and are an increasingly viable and common way to offset electricity use, both domestic and commercial<ref name="Reuters">[http://www.reuters.com/article/GCA-GreenBusiness/idUSTRE52J5VW20090320 US Installed Base]," Reuters, March 20, 2009.</ref> The key drawback in solar energy generation is that when the sun goes down, there is no new energy created. As such, its use is dependent on storage of energy for use during the night. However, as one article points out, its electricity production maximizes at under the same conditions that tend to overtax powergrids; hot sunny days. <ref name ="Reuters"/>. 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. <ref name="SciAm">[http://www.sciam.com/article.cfm?id=a-solar-grand-plan A Grand Solar Plan], ''Scientific American,'' December 2007.