No owls are not omnivores because they eat mice,lizards,and snakes.
5.3 Operating Expenditures for Offshore Wind There has been no indication that expected operating expenditures for offshore wind projects have shifted between 2010 and 2013. The OpEx baseline for 2013 was assumed to be $40/MWh, equivalent to $136/kW/yr, with a range extending from $20/MWh to $70/MWh.
According to RenewableUK, the average cost of generating electricity from large scale onshore wind is now around three to four pence per kilowatt hour, competitive with new coal (2.5 - 4.5 pence) and cheaper than new nuclear (4 - 7 pence).