280-Megawatt Solar Boiler Uses Magnifying-Glass
July 8, 2009 · Print This Article
The solar potential plant Abengoa Solar will build in Gila Bend, Arizona, won’t rely on fancy photovoltaic panels. No, it uses pretty much the same trick your evil ass used on bugs and leaves way back when: focusing sunlight to create high heat. In that case, mirrors focus the sun’s rays into tanks of heat-transfer oil, heating it to about 400°C, boiling water for a steam turbine.
The appeal of the system is its low cost and high scalability. MIT’s Technology Review says that, according to one expert, “solar thermal capability will become cost competitive with other forms of ability generation decades before photovoltaics will.” And even though solar thermal costsmore than wind potential (around 15 cents per kilowatt versus wind’s 8 cents per kilowatt), solar thermal energy, trapped in the style of heat, is much more easy to save up. Energy can be generated even when the sun isn’t shining—in the case of Abengoa’s Arizona plant, part of the heat doesn’t directly boil water but is transferred to molten salt tanks, where it can be stored to ability the turbine for up to six sunless hours.
The plant goes operational in 2011, and will generate 280 megawatts, sufficient to supply energy for 70,000 homes, customers of the Arizona Public Service in Phoenix.