Tesla has produced one million Powerwalls in 10 years. A look at the milestone and why Tesla Energy could be a key Tesla catalyst. celebrated its one-millionth Powerwall produced this week. The milestone comes as Tesla's Energy segment has shown high year-over-year growth and could be one of the electric vehicle company’s underappreciated and undervalued segments. What Happened: Tesla introduced the Powerwall around 10 years ago, and it has played a critical role in creating virtual power plants, giving consumers backup energy options, and helping spur solar roof growth. This week, Tesla acknowledged the production of its one-millionth Powerwall as the company continues to ramp up production of the newer Powerwall 3 version of the popular energy device. "Congratulations Tesla Nevada team on building our 1,000,000th Powerwall powering American homes, boosting energy independence, and strengthening U.S. manufacturing," Tesla Energy tweeted.