In Minnesota, an industry group says the rules will shrink available space for solar panels by at least 20%.
An industry group had already been pushing for an extension of a popular solar incentive program set to end in 2021.
Safety is the main goal, but long-term pollution benefits could be seen as streets become safer for walking and biking
The proposal recently received a $50,000 prize from a National Renewable Energy Laboratory solar manufacturing contest.
The energy use intensity of larger commercial buildings in Minneapolis declined by 5.5% between 2015 and 2018.