March 28, 2019 | Isaac Orr | American Experiment According the National Renewable Energy Laboratory, wind turbines have operational lifetimes of 20 years, but it appears Xcel Energy’s 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 Administration plant-level data. It shows … Continue reading Minnesota’s Third-Largest Wind Farm is Already Losing Steam: Output Falls 14 percent from 2014 Highs