Governor Tom Corbett has signed legislation allowing Tesla Motors to open five dealerships in Pennsylvania.
Tesla pushed for the bill, signed last week by Corbett, because its business model had run up against a state law prohibiting manufacturers from also acting as a vehicle dealer.
The bill won swift approval after the sponsor, Senator John Rafferty of Montgomery County, introduced it in June.
The law applies to any electric vehicle maker and carries certain conditions, including that it deals exclusively in its own brand and it doesn't hold a controlling interest in another make.
Rafferty said a similar exemption for Saturn was allowed in 2000.
Tesla had already opened a dealership in King of Prussia, Montgomery County, although Rafferty and state officials couldn't explain how it had qualified for a license.