In our last deep dive into the world’s biggest AI factories , we marveled at the speed of xAI’s Colossus and the secretive might of Microsoft’s West Des Moines campus. Back then, a 100,000 GPU cluster was considered a "titan," and power draws of 200 MW were cutting-edge. That was then. This is now. Less than two years later, the landscape has shifted violently. We have moved from the "Megawatt Era" to the "Gigawatt Era," where AI data centers consume as much power as major me