It may be that renewable energy sources will become cheap enough to someday be the Golden Goose, but it seems apparent that squeezing electricity out of wind, solar, biomass, etc. isn't enough. There's also the pesky problem of transmission — getting the juice from the place where it's generated to the location where it's used.

The U.S. Department of Energy has a target: generating 20 percent of the nation's electricity through wind power by 2030. But the head of the American Win ...

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