I remember there was one complex feature that was designed to lighten the load on power plants on the hottest or coldest days of the year when everyone cranked up the heat or AC at once. It usually came down to just a few hours in the afternoon, a few days a year—one or more coal power plants would be brought on line to avoid blackouts. So we designed a feature that predicted when these moments would come, then the Nest Thermostat would crank the AC or heat up extra before the crucial peak hours and turn it down when everyone else was turning it up. Anyone who signed up for the program got a
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