But with cogeneration they can bring that 45% up to 90% assuming heat and air conditioning loads at the load site.

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"Residential air-conditioning is the peak load problem, and we're able to tackle the load-shifting in a very automated way, " says Matt Rogers, Nest's engineering VP.

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Stanway's traders are buying power in load blocks of 250 to 300 megawatts--enough current to keep the air-conditioning and lights on at more than 200 superstores, depending on the weather (and enough to power 250, 000 homes).

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