The United States is not yet generating a watt of energy from commercial offshore wind. A couple of years ago, it looked like the Great Lakes might lead the nation. Pennsylvania was among a handful of states working with federal agencies to speed up the process. As recently as a couple of months ago, construction of a wind farm in Lake Erie, off the Ohio shoreline near Cleveland, looked promising. But now some are sounding the death knell for any wind development in the Great Lakes.