29 May '12, 1pm

Solar Power Can Double Pumped Hydro Output (Nice)

Solar Power Can Double Pumped Hydro Output (Nice)

Solar has driven down the afternoon wholesale price of electricity to approximately the same level as midnight when pumped hydro normally charge up their reservoirs. Pumped solar relies on price differentials of daily electric markets. At night, when old fashioned coal and nuclear power is abundant and not in demand, power prices are cheap. Pumped hydro operators buy the cheap nighttime power to run pumps to move water to high ground. During daytime peaks, electricity prices are higher, so the pumped storage operator let’s the water run down through turbines to generate instant-on electricity to meet peak demand. What’s new is that there is now a new low price trough in the afternoon in Germany since so much solar power has been installed. There is one peak price in the morning and another peak price in the late afternoon/early evening. In the mid afternoon on sunny days, ...

Full article: http://cleantechnica.com/2012/05/29/solar-power-can-doubl...

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