U.S. solar companies boosted their employee rolls by 22 percent last year, and now employ 86 percent more workers than they did in 2010, driven by rising demand in the world’s third-largest market.

Almost 174,000 people are working in the U.S. solar industry, compared with 143,000 in 2013 and 93,500 in 2010, according to a report today from the Solar Foundation. Another 36,000 solar jobs may be added this year, including factory workers, salespeople, installers, developers and researchers.