One Elon Musk company made over half a billion dollars selling to two other companies in the Musk universe . Tesla generated $573 million in revenue last year, selling cars and battery systems to SpaceX and xAI, according to a regulatory filing uploaded on Thursday. Tesla said it made about $430 million last year by selling Megapack products — a lithium-ion battery system — to xAI, Musk's artificial intelligence company, and the maker of Grok. It added that it made about $143 million, mostly