DOE energy storage grants look to the day when renewables rule the grid

“Existing storage technologies fall short in terms of duration. Lithium-ion batteries, which have captured about 90% of the energy storage market, can economically run for about four hours. Pumped hydro storage, which accounts for the most energy storage today in terms of capacity, can generate power by releasing water from storage reservoirs for up to 20 hours under certain conditions. But as renewable energy penetration reaches and surpasses 50%, the need for even longer durations will grow.”

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