SpaceX spent $329 million on Tesla Megapack battery systems during the first half of 2026 as costs connected to its AI data center expansion rose sharply, according to a public quarterly filing with the Securities and Exchange Commission. The six-month total was already about 65% of the $506 million SpaceX recorded in Megapack purchases for all of 2025. SpaceX acquired xAI on February 2 and now reports AI as one of its three operating segments. The U.S. Department of Energy has described AI data centers as large, dynamic loads that can create repeated swings in electricity demand. For companies expanding AI capacity, SpaceX’s spending illustrates how quickly the power portion of a project can grow.