Tafel Power

Fifty Percent of What?

Large power contracts set a minimum bill owed even if the load never arrives. On one 60 MW contract where only 30 MW shows up, it runs from 15 MW on a Texas campus to 51 MW in Virginia, because each measures against something different.

For infra funds · For developers · For utilities · For hyperscalers · large-load · project-economics · capital · procurement

Kris Narayanan · Tafel Power · August 16, 2026 · 4 min read


Every one of these contracts answers that worry the same way, with a minimum. The number attached to the minimum is what everyone compares.

It is the wrong thing to compare.

Start with the campus

Fermi's campus in the Texas Panhandle will buy its power from a generator building on site. Under a framework agreement entered August 11, 2026, Fermi commits to a take-or-pay of 50 percent or more of the combined power requirements of all its tenants, at a fixed capacity charge.

The 50 percent is measured against the requirements of tenants that have signed. Until tenants sign, the requirement is zero, and so is the floor.

The structure is written that way. The generator is carrying demand timing risk on the first block, agreeing to build roughly 360 MW without waiting for tenant power purchase arrangements to be signed. That is a risk the generator has agreed to hold. But a lender reading "50 percent take-or-pay" and a lender reading "85 percent of contracted demand" are not reading the same protection, and the two numbers give no hint of the difference.

Two commissions wrote 85 percent and meant different things

AEP Ohio and Dominion Virginia both landed on 85 percent, five months apart, in different states. Then they applied it to completely different things.

Virginia's minimum is 85 percent of contracted demand for the wires and 60 percent for generation. Sign for 500 MW and you owe against 500 MW. If half the load arrives, you still owe against 500.

Ohio's is 85 percent of the customer's own highest monthly billing demand over the previous eleven months. It follows the customer down. If the load never gets past half, the customer's own peak is half, and 85 percent of that is smaller again.

Ohio does protect the utility, but not with that clause. Underneath the ratchet sits a stepped minimum demand set against total contract capacity, and billing demand is the greater of the two. That second test is what binds when the load disappoints. Read only the headline percentage in Ohio and you have read the clause that does the least work.

What that costs, on one contract

Three minimums against the same 60,000 kW contract where only 30,000 kW of load ever arrives. Dominion Virginia bills 51,000 kW, being 85 percent of contracted demand, because the base was fixed at signing. AEP Ohio bills 44,750 kW, which is its stepped Minimum Demand of 15,000 kW plus 85 percent of contract capacity above 25,000 kW, and not its 85 percent ratchet, which would give only 25,500 kW against a realized peak of 30,000 kW. The campus take-or-pay bills 15,000 kW, being 50 percent of what the tenants that showed up actually need, because the base shrank with the load.
AEP Ohio Schedule DCT compliance tariff filed 11 July 2025. Dominion Rate Schedule GS-5, Virginia SCC final order 25 November 2025. Fermi Inc. Form 10-Q for the quarter ended 30 June 2026, Note 9. The campus figure is a take-or-pay on tenant requirements rather than a billing demand, shown on the same axis for comparison only. Analysis: Tafel Power.

Same contract. Same shortfall. Three bills, from 15,000 kW to 51,000 kW.

Two of these percentages shrank with the customer. Only one of the bills did.

The rest of the comparison

The Fermi campusAEP OhioDominion VirginiaEntergy Louisiana
The minimum, and of what50 percent or more of what tenants need85 percent of your own past peak, or a stepped floor against contract capacity, whichever is greater85 percent of contracted demand for wires, 60 percent for generationNot published
What backs itThis minimum is the take-or-pay to the generator, and what backs it is a guarantee capped at twelve months of capacity charges. The lease carries its own guaranties, both ways, with no amounts publishedGuarantee or collateral at signing, half the full-term minimumsRequired, amount not read for this pieceNot published
Cost to leaveNot publishedMinimums for the rest of the termMinimums for the rest of the termNamed, no number

One row in that table runs the other way. Ohio and Virginia publish a ratchet, a term and an exit fee, and neither schedule states a cap. The Louisiana order names every instrument and states no amount for any of them. The ceiling in the backing row is the only one in the four, and it comes from the private deal, in Fermi's 10-Q.

What this means for the next one

The next large tenant will be quoted a price per megawatt-hour, and that price will be compared to other prices.

Underneath it sits a minimum, and the minimum is only as good as the thing it counts. A base fixed at signing is still there when the load is not. A base that tracks what the customer actually did, or what its tenants actually need, goes away exactly when it is needed.

Neither of those facts shows up in the rate, and both of them show up in the bill.

Where the fuel and the exit terms sit is in Who Holds the Fuel Risk?. Every source, with the full ledger, is in the record.


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Questions, corrections or disagreement on any of this are welcome: kris@tafelpower.com

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