The U.S. has not yet seriously considered pumped hydro for new energy storage, according to Energy Secretary Steven Chu.
Pumped hydro storage uses excess electricity to pump water uphill to areservoir. Then when electricity demand increases, the water is released downward through turbines to generate electricity that is fed into thegrid.
On average, pumped hydro storage costs less than $100 per kilowatt hourand is a highly efficient method of storage. By comparison, SecretaryChu said sodium ion flow batteries cost about $400 per kilowatt hour and offer less than 1% of the capacity of pumped hydro.
There are currently only about 40 pumped hydro facilities in the U.S.–all of which were built at least two decades ago.
Chu wants to see a resurgence of pumped hydro to store power produced by renewables and to provide additional stability to the U.S. power grid.
Perhaps the biggest challenge facing the development of pumped hydro isthe overall cost of projects. Despite being cheaper on a per-megawattbasis than other forms of energy storage, pumped hydro projects arelarge-scale projects, typically built to provide about 1,000 MW ofstorage at a cost of $1 billion to $2 billion.
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