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I used Electric Connection (www.theelectricconnection.com). I believe they are on Tesla's "approved" list as well. For whatever it's worth, they did a great job. They added a sub panel to my existing panel because there wasn't any room left. They also ran a NEMA 14-50 outlet all the way to the other side of my garage. The final install was extremely professional and clean. They handled everything with getting the permit from the city as well.