There's an old joke in Brazil that it is the nation of the future--and always will be. For decades the same has been said of the renewable-energy industry. Someday soon, its promoters kept promising, solar cells and wind turbines would produce electricity more cheaply than would traditional plants burning coal and oil and natural gas. There have been many false dawns, as fossil-fuel prices soared and then swooned. But the promised day appears finally to have arrived at, among other places, windswept hilltops in Texas and Colorado. On King Mountain, near McCamey, Texas, Renewable Energy Systems has teamed with Cielo Wind...
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