TFA says: "They had a unique problem, Nakhamkin said, in that their daytime load far exceeded their nighttime load, the opposite of the regular pattern."
This is NOT a unique problem. It is NOT the opposite of the regular pattern. The normal pattern is heavy usage durring day excess capacity at night. Existing hydo systems pump at night and generate during the day. I suppose that is is possible for some system to have heavier demand at night, but I cannot imagine where that would be. Air condidioning is higher during the day (its hotter), industrial users use more during the day (not all industrial users are 24/7 and even those that are generally are busier during the day), transit systems run more during daytime hours, and on and on.
Animal intelligence ranking -> Mice, dolphins, humans, chimps, ........., cockroaches, journalists, sports journalists.