The cost of wind-power generation has come down from 8-10 cents to 3.5-4 cents per kWh since 1990 because of better turbines and higher volumes.

• 得益于性能更佳的涡轮和更大的发电量，自1990年以来，风力发电每千瓦时的成本从8-10美分下降下3.；5-4美分。