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The are already developing much larger plant in Utah

(Hard to say how much larger as the tech journalists only use "households powered" units)

They specified a conversion rate of 1 MW : 750 "homes". So if the Utah project can power 750 "homes", that's 400 MW.

It's common to use a conversion rate of 1.4 kW for a home, so that's really close to the 1MW == 750 homes equation.