WindUS offshore wind 'to generate $68bn in Capex by 2030'Expenditure for more than 1,700 turbines and towers alone will total $29.6bn if states procure a potential 18.6GW of power capacityBlock Island array, America's only offshore wind projectFoto: DON EMMERT/AFP/Getty Images/NTB scanpixRichard A. Kessler in Fort Worth