A single DGX B300 that could run Kimi for a few concurrent users, uses 14 kW.

Huh? 1400 TDP = 1.4 kW. This is official I believe.

And maybe my sources are off but: “As of July 2026, a single B300 GPU purchased outright runs about $53,000 (Spheron Network, July 5, 2026)” https://tech-insider.org/nvidia-blackwell-gpu-pricing/

Uh you’re right, you need about 4x so 270 kWh over the day, which requires about 270 / 6 * 24 = ~1000kW. With about 175€/kWp panels that is another 175 thousand plus installation. And something like 4000m². But that is all the energy costs for 30 years up front. The bigger constraint is the land use then.