A recent Economist article reports that wind-power technology has been improving, to the point that wind power now costs 8 cents per kilowatt-hour, which is less than twice the cost of coal power (5 cents/kWh). I think this makes wind power vaguely plausible as a serious contributor, provided necessary advances are made in the power grid. (Existing power grids can’t handle the inconsistency of wind power.) I don’t think anyone has any idea how much those advances will cost.
Nuclear, by the way, costs 6.5 cents/kWh, has no greenhouse emissions, and works fine with the existing grid. (Solar costs 20 cents/kWh. Good luck with that.)
Internet Scofflaw 