Elon Musk's xAI plans a significant expansion with a $20 billion data center investment in Southaven, Mississippi, described as the state's largest private project. The facility, named MACROHARDRR, aims to house the world's largest supercomputer with 2 gigawatts of computing power and is slated for operations by February 2026. This development occurs amid scrutiny from groups like the NAACP and Southern Environmental Law Center regarding potential air pollution near Memphis, while Mississippi's governor highlights job creation and economic benefits.