For the long-term power-purchase agreement wind has an advantage since over that time scale the total output is confident. There might be poor years and better

For the long-term power-purchase agreement wind has an advantage since over that time scale the total output is confident. There might be poor years and better ones but compared to long term uncertainty of fuel prices it is financially favorable. There is also a couple of decades of data on service and maintenance costs from large projects elsewhere in the world, settling past doubts on the technologies viability.