How state solar permitting mandates are picking winners and stifling innovation

Some states are pushing cities to speed up solar permit approvals by requiring automated permitting software, and a debate has opened up over how that requirement is written. In California, a law called SB 379 tells local governments they must have an online permitting system that can do what SolarAPP+ can do. SolarAPP+ is a permitting tool built by the National Renewable Energy Laboratory that lets some residential solar projects get approved automatically, without a person reviewing every detail.

Critics argue that tying the law to one specific platform's capabilities favors that product over competitors, even when other systems might handle local rules better. SolarAPP+'s board includes executives from large solar installers and manufacturers, raising questions about whose interests shape the tool. When the California law was being considered, SolarAPP+ reportedly could not process an estimated 60% of residential solar permits, yet many local building departments adopted it anyway to stay in compliance with the state law. In Tracy, California, inspectors have said the platform's rigid checklists are hard to use during busy workdays.

For homeowners, this mostly plays out behind the scenes at your local permitting office rather than at your kitchen table. But it can affect how fast your solar permit gets approved and how well the system accounts for your area's specific building or safety rules. As a counterexample, Bakersfield, California uses a different, more flexible permitting platform covering more than 15 types of home retrofit projects, and has seen permit processing times drop 75% with a 40% gain in staff efficiency. If you're planning a solar installation, it's worth knowing that permitting speed and ease can vary significantly depending on which system your city or county uses.