Financial documents filed by Tesla on Thursday revealed that in 2025, it sold Megapack, its ultra-large energy storage batteries, worth $430 million to Musk's AI startup xAI. This transaction accounted for approximately 3.4% of Tesla's energy business revenue. Tesla's energy business revenue saw a year-on-year increase of 27% in 2025, rising from $10.1 billion in 2024 to $12.8 billion.
