Tesla Motors, the popular Silicon Valley company that makes luxury electric-powered cars, is opening a showroom and service center near Cool Springs. It's Tesla's first operation in all of Tennessee, according to an announcement made Sept. 18. Tesla is leasing 1641 Westgate Circle, in Brentwood. The property sits at Exit 69 of Interstate 65, right near the point where Brentwood stops and the city of Franklin, including its Cool Springs commercial hub, begins. The renovated building is the former…