Time Magazine: Tidal power isn’t for the faint-hearted, as Verdant Power CEO William Taylor knows from experience. The first time Taylor’s company sank an experimental turbine into New York City’s East River, in late 2006, the powerful tidal currents — they can run up to 6 m.p.h. (almost 10 km/h) on a good day — smashed the device’s fiberglass blades. Next they tried a turbine with rotors made of aluminum and magnesium, but after a couple of months the river won again. Finally, in the summer of 2008, …