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Wind Affordable if not unaffordable

To get a substantial portion of our electricity from wind means building hundreds of thousands of turbines. They're affordable, so we could do that. But we usually don’t live in the windiest areas, so we’ll also need to build transmission lines – which is harder than building the wind farm itself. If the wind stops blowing when we need the power, we’ve got to replace it quickly with some other generation. Hopefully, challenges of siting, transmission and backup generation won’t make this clean, affordable resource, unaffordable.