Hoover Dam as a $3B Battery?

The Los Angeles Department of Water and Power and Los Angeles mayor Mayor Eric M. Garcetti are proposing a $3B project to utilize Hoover Dam for hydroelectical pumped power storage to manage electricity demand.

The concept targeted, for 2028, is to pump water uphill from 20 miles downriver from the dam using peak solar and wind power to be released for hydro-generation when required.  Significant political, environmental and economic challenges will need to be considered and addressed.

https://www.nytimes.com/interactive/2018/07/24/business/energy-environment/hoover-dam-renewable-energy.html

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