New York Times: All the talk about the bad oil bubble obscures the potentially good bubble still inflating in the realm of alternative energy. Wind turbine installations more than doubled last year. Ethanol production capacity will nearly double once all the plants under construction are completed. Investors have given SunPower, a solar panel spinoff from Cypress Semiconductor, a market value much larger than that of its former parent. Such exuberance is characteristic of bubbles that periodically …