"Iowa is the leading producer of wind energy in the country and generated 36.6 percent of its electricity from wind in 2016. Statewide, the wind industry employs between 8,000 and 9,000 people and has added $11.8 billion to the state’s economy through capital investments. Wind farms that are built on private land, which is leased to wind developers, collectively earn farmers and landowners an estimated $20 million annually. The mining industry in Iowa, by contrast, employs around 2,200 people — and is primarily made up of stone mining and quarrying jobs. Because of the way Iowa breaks down its employment data, that number also includes natural gas and petroleum extraction. According to the Bureau of Labor Statistics, the wind industry currently employs more than 100,000 people in the United States, and wind turbine technician is the fastest growing occupation in the country. In 2016, wind capacity — the total amount of output a particular electricity generator can produce at a given time — passed hydropower to become the largest source of renewable energy capacity in the United States."