Aquabank Pump Water Underground to Store Wind Energy
By September 2nd, 2009Wednesday, September 2, 2009 1:54 on
The pumped hydro storage technology is already developed in a large scale. Riverbank Power, a new start-up founded by a former wind developer has a new idea. It wants to develop large-scale energy storage by using hills down onto the ground.
Their new system called Aquabank, generate hydro electricity by letting gravity drop water underground to turn turbines. That electric energy would be sent from underground to the grid day time. During the night, when excess wind is available, wind powered electricity would gently push the water back up to replenish its surface source.
Each project would use a source of water at ground level, an excavated cavern approximately 2,000 feet below ground and four 250-MW generators in a below-ground powerhouse. The surface footprint would be only 5 to 10 acres, mainly for the water diversion structure and transmission infrastructure. The underground footprint would be about 100 acres.
It would use about 1 billion gallons of water for six hours of electricity production. It would take eight hours to pump out the cavern. The remaining sixteen hours each day the water supply would not be diverted.
Such a novel idea is pretty amazing for a new company like Riverbank Power.
[Original Source: Cleantechnica]
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