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The length of time an unmanned power plant will run will vary as the type of plant (and the location). In the case of coal fired plants, the auto-loaders won't last long without someone driving the endloader to get fuel (the coal) to the front end. In the case of oil fired plants, these could run for several weeks or months without intervention if fuel supplies were set up properly. The best of these plants are highly automated and have a good service life with little intervention required. It's the steam side that gives us "maintenance" problems. Hydroelectric plants would be a top contender. They can run for weeks and even months without help. Hoover Dam would only last a few weeks owing to clogging of the generator coolers by organic matter. (Staff must clean these manually.) Other hydroelectric sites would doubtless fair better. The nuclear plant would be about the toughest contender for a hydropower plant. On a full charge of fuel, it can run quite a while. These plants are very self-sustaining (at least on the primary side) once they are at power. The secondary side water problems would probably catch up and cause a shutdown if they weren't attended to (like the oil fired plants). The nuclear plant would be able to go for weeks to months. The winner in a contest would be a big photovoltaic plant where solar panels provide power by directly converting sunlight into electricity. Anyone who bets against them would probably not come out on top. With no moving parts, these guys should be able to run 'til the cows come home - and then some.

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Q: How long can a power plant run unmanned?
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