AI can push production systems to 70–90% of their theoretical limits under current energy constraints, doubling the unit output of "people"; but it cannot break through the energy density ceiling, nor can it create a new K-wave level leap. After all, AI won't make steel smelting more energy-efficient. So, in an era without a fundamental energy source breakthrough, will AI become the "only lever for alternative energy"? The answer is: •For the country: not enough •For individuals: sufficient and extremely important The class transition in the next 20 years will not rely on "cheaper energy," but on "who can organize more real-world resources with AI in an energy-constrained world."