Tag Archives | pumped hydro energy storage

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.