China
Coal remains the silent baseload
Even with the world's largest solar fleet, Chinese AI data centers were still estimated to run on roughly 70% coal power in 2025. The country's weakness is not panel supply. It is firm, hourly delivery.
- Renewable-rich western provinces still experience curtailment.
- Green electricity certificates can overstate physical renewable delivery.
- Grid operators remain cautious about running inflexible AI loads on intermittent supply.
United States
Gas is becoming the speed solution
When utilities and interconnection timelines cannot deliver power quickly enough, hyperscalers and AI developers are increasingly bypassing the grid with on-site or near-site gas.
- Behind-the-meter gas is fast compared with transmission build-out.
- Nuclear and storage appear in the medium-term portfolio.
- “Renewable AI” claims often coexist with fossil backup.
Bottom line
Solar alone does not solve 2 AM
The central article spine survives every cross-check: neither country can yet run next-generation AI clusters primarily on solar without large parallel investments in storage, transmission, and firm generation.
- Training can sometimes be shifted.
- Inference is much harder to shift.
- Battery deployments remain too short-duration for the full problem.