Underground pumped hydro energy storage at grid scale

Gravity Power proposes boring holes in the ground, perhaps thousands of feet deep, and filling them with water and a large weight. Surplus electricity would be used to raise the weight, creating a form of underground pumped storage. The weight would be dropped during peak periods to produce electricity in a turbine.

What renewable energy needs is a way to store excess energy at grid scale for later use. Gravity Power thinks they can take traditional stored hydro (pump water up to a holding tank) and do it underground. This eliminates environmental concerns with fish and they say a 7 acre site could store a massive 2 GW.

The bore hole is filled with water and sealed so it seems it would have little impact on the surrounding area and no toxic chemicals are used. This is a seriously good idea.

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