Extension narrative · #233 · the grid it will carry

The number everyone cites is the backup — and it's redacted

Every summary repeats ~313 MW. It is backup generation — 114 emergency gensets — not the operating load, and the per-engine rating that multiplies to it is redacted in the issued permit. So the working draw can only be inferred: 303–393 MW (central ~348), and that inference chain is the uncertainty. Drag it open below. Full essay: the load and the grid →

REDACTED · per-engine rating (issued permit) Why won't the issued permit say how big the engines are?

the lock

The issued air permit withholds the emergency-generator make, model, and size as confidential business information. The per-engine rating that multiplies to the famous ~313 MW survives only on the draft public notice — not in the issued permit.

So the most-cited number about this facility — ~313 MW — rests on a figure the issued permit redacts. The backup capacity is real; the per-engine rating behind it, and the operating load you would derive from it, are withheld.

~313 MW backup total, as stated in the committed final-permit extraction data/extracted/permits/4132514.epa.yaml ('the ~2,750 ekW/engine figure behind the ~313 MW backup total'). NOT a figure of the issued permit, which withholds the per-engine rating as trade secret and so cannot state the total: it is the final permit's unit COUNT (114 hall gensets) x the DRAFT public notice's ~2,750 ekW/engine (eDocs 3987141/3987144), approximate as transcribed. · OEPA Air PTI P0138965 (Facility 0302022054), committed data/extracted/permits/4132514.epa.yaml (final, 2026-05-28): 114 hall gensets x 2.75 MW (~2,750 ekW) = ~313 MW backup; IT ~250-300 MW (N+1). Per-engine rating from the draft public notice (3987141/3987144); engine size CBI-redacted in the final permit under an Ohio EPA trade-secret grant (OAC 3745-49-03, 2025-10-08; data/extracted/permits/3859883.epa.yaml).

The grid it lands on is AEP Ohio (Ohio Power Company)'s — 48,652.9 GWh/yr of retail sales, the denominator every share on this page divides by. See the grid backdrop →

The inference chain

Step	Figure	Register
Backup generation (114 gensets)	~313 MW	`[verified: draft]`
IT load (N+1 backup ≈ IT)	~250–300 MW	`[inference]`
Facility draw (IT × PUE)	~303–393 MW	`[inference]`

~2,743 GWh/yr — about 5.6% of AEP Ohio (Ohio Power Company)'s entire retail electricity (48,652.9 GWh), for ~50 jobs. Load, not jobs. Enable JavaScript to collapse the band by disclosure.