This power plant is a net consumer of electricity, but it helps meet peak daytime demand. After pumping all night, and reversing during the day, out achieves
2:56 overall 70% efficiency
10:12-12:50 A combination of human errors led to the failure in this unmanned system: not accounting for wall settlement, dislodged water-level sensors, backup water-level sensors placed on the highest portion of the wall, and no human confirmation of water levels monitored by these systems.
12:50 "unfortunately, when you rely on complicated systems for safety, the likelihood of failure goes way up."
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