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I had no idea so few dams generated power. Here in the PNW, most of the dams you hear about exist mainly for power generation. In terms of energy production, it is of course a trade-off. The utility companies here are proud of the fact that our energy is "green" because most of it is hydroelectric, ignoring the widespread environmental effects of building those dams. Of course, most of the rest of the country still relies on some form of fossil fuel for its power, and that too has huge environmental costs. Until we have widespread energy generation that is non-emitting, should we not keep hydroelectric dams?