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How can there be solar at 21.15 GMT+1? Even if just 0.30%. Is this from the accumulated residual during the day?

Concentration solar... It melts salt that still provides energy for a few hours. https://en.wikipedia.org/wiki/PS10_solar_power_plant

wiki says they're using superheated water for storage, lasting 30mins and the salts are under consideration - sounds like a serious improvement, do you have more info?

Click through the list of solar power plants, In particular I found this one: https://en.wikipedia.org/wiki/Crescent_Dunes_Solar_Energy_Pr...

> Melting about 70,000,000 pounds (32,000,000 kg) of salt takes two months.

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