On-site power generation [/ˈon-site ˈpaʊər ˌʤɛnərˈeɪʃən/] n - The binding constraint of the AI buildout is that utility power can’t be delivered fast enough. Interconnection queues and new transmission lines reckon in years; the campuses want gigawatts now. The answer is a return to on-site generation [/ˈon-site ˈgeneraʃən/] n - not as backup, but as primary or bridging power.

This is a different office than the The Standby Engine, which exists only to ride out an outage. On-site generation here is meant to run, sometimes for years, until the grid catches up.

The Contrivances at Hand

• Natural-gas turbines and reciprocating engines [/ˈnætʌrælgæs ˈtʌrbɪnɛs ˈænd ˈrɛkɪprɒkætɪng ˈɛngɪnɛs/] n - fast to deploy, and the most common bridge today; the price is fuel logistics and emissions.
• Fuel cells [/ˈfʌɛl ˈkɛlls/] n - produce DC directly, which pairs neatly with 800-volt DC distribution and spares several conversion stages.
• Small modular reactors (SMRs) [/ˈsmæll ˈmɒdʌlær ˈrɪːktɒrs ˈsmrs/] n - much discussed for long-term, carbon-free baseload; still mostly future-tense, with long licensing timelines.
• Behind-the-meter solar plus Battery energy storage [/ˈbɛhɪndthɛmɛtɛr ˈsɒlær ˈplʌs ˈbættɛri ˈɛnɛrgi ˈstɒrægɛ/] n - good for shaving peaks and firming, rarely sufficient alone at this scale.

Of Its Place in These Pages

On-site generation rewrites the top of the chain in The Engines of the Hall: the Where the Grid Comes In is no longer the sole source, and the site must now manage paralleling, grid synchronization, and islanding. It touches the demand side as well; when one cannot simply buy more megawatts, the workarounds recorded in When the Fence Would Give No More become standard practice. The utmost case of on-site, off-grid generation is a lunar site that must endure two weeks of darkness; see Data Centers on the Moon.

Part of The New Buildout.