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Gemasolar, a 15 megawatt solar power tower plant in Spain. Gemasolar uses molten salt technologies for receiving and storing energy. Its 16-hour molten salt storage system can deliver power around the clock. It runs the equivalent of 6,570 full hours out of 8,769 total, says makers Torresol Energy.

Photograph: Markel Redondo/Greenpeace via

So this isn’t exactly practical help for a home owner – but it does make for a striking photo!

Marcello de Pozo/Reuters via

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