Elon Musk’s house runs on solar. The Tesla CEO made the announcement during Wednesday’s second quarter 2017 earnings call, where he revealed that both himself and Jeffrey B. Straubel, the company’s chief technology officer, have installed solar roof tiles on their houses. “We have installed and working the Solar Roof tiles,” Musk told investors during the conference call. Tesla started taking pre-orders for the textured black and smooth grey tile styles back in May, with U.S. orders expected to start shipping this year. Unfortunately, those who didn’t order immediately have a long wait on their hands: the tiles sold out until next year in just 16 days. The company is expected to start taking orders for the remaining Tuscan and slate styles in November, with deliveries starting next year. International orders are expected to start shipping next year. The solar roof is offered at a competitive price point. Tesla has priced it at an average of $21.85 per square foot, bringing it down to below the cost of a normal roof.