Wind turbines are supposed to last for 20 years, but Xcel Energy’s Nobles wind project is losing steam after just eight.

As a result, production costs have increased 17 percent as electricity generation has fallen 14 percent from their 2014 highs.

Minnesota’s Third-Largest Wind Farm is Already Losing Steam: Output Falls 14 percent from 2014 Highs – American Experiment

According the National Renewable Energy Laboratory, wind turbines have operational lifetimes of 20 years, but it appears the Nobles wind project, the third-largest wind farm in Minnesota, is losing steam after just eight. The graph below was produced using data from the U.S. Energy Information Admin…