For places with mountains, there is “pumped hydro.” It’s a sort of man-made dry lakebed near an existing hydroelectric dam. When there is too much water, whether run-off or rain, some of the electricity the dam makes is used to pump the excess water uphill, into a second reservoir, where it sits until additional power is needed, then this water is allowed to flow naturally downhill again passing through a set of turbines at the bottom to generate a “new” electric current. Ninety-five percent of the electricity “stored” in the United States is guarded in this way—22 gigawatts’ worth or the
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