Energy cost from wind may go negative for very short periods of time, fluctuating, but if you include the capital cost of building huge wind turbines and connecting them to the grid, the average yearly cost of electricity from huge wind farms (unsubsidized) is not lower than 6.5 to 8.5 euro-cents per kWh. It's a lot better than hydrocarbons but it is NOT competitive for huge constant base loads with rare specific geographic hydropower bargains (2.5 US cents/kWh for "all you can eat") power if you can locate a facility very close to the Grand Coulee or Rocky Reach dams on the Columbia river.