Wind farms can provide society a surplus of reliable clean energy, Stanford study finds

http://www.eurekalert.org/pub_releases/2014-03/su-wfc032014.php

......One advantage of wind over solar power is that it has an enormous energy return on investment, Benson explained. "Within a few months, a wind turbine generates enough electricity to pay back all of the energy it took to build it," she said. "But some photovoltaics have an energy payback time of almost two years. To sustainably support grid-scale storage will require continued reductions in the amount of fossil fuel used to manufacture photovoltaic cells.".....