Pumped hydro station
When it comes to bulk storage, the method to beat on price is pumped hydro. A pumped hydro station moves water from a reservoir uphill during off-peak times and then releases the water through a generator during peak times. By generating electricity at peak times, the electricity is more valuable. The obvious challenge with pumped hydro stations, like this one operated by Pacific Gas & Electric, is finding suitable locations.
September 17, 2010 4:00 AM PDT
Photo by: PG&E
| Caption by: Martin LaMonica
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