The Arizona Corporation Commission decided on Friday to launch an investigation into the business practices of the rooftop solar industry, a move that aims to address mounting concerns that solar leasing companies are misleading consumers.

Leasing is the most popular avenue for going solar because it’s seen as a way for homeowners to save money and energy without the upfront costs of buying solar systems outright. In Arizona, roughly 80 percent of all solar customers lease their systems.

But consumers, Arizona Attorney General Tom Horne and Congress members have been raising concerns that leasing companies might be using deceptive marketing and overstating the cost savings to homeowners. Several Democratic and Republican members of Congress, including Kyrsten Sinema and Matt Salmon, among other Arizona lawmakers, have recently sent letters to the Federal Trade Commission and the U.S. Consumer Financial Protection Bureau requesting the matter be looked into.

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