He reportedly wants 250 gigawatts of new electricity-equal to about half of Europe's all-time peak load-to run gigantic new data centers in the U.S. and elsewhere worldwide by 2033. Building or expanding power plants to generate that much electricity on Altman's timetable indeed seems almost inconceivable. "What OpenAI is trying to do is absolutely historic," says Virun Sivaram, Senior Fellow for Energy and Climate at the Council on Foreign Relations.