As incomes rise, more shoppers will opt to drive to large, air-conditioned stores and load up on groceries.

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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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