PJM's Market Monitor Puts a Number on It: Data Centers = 46% of the Last Four Capacity Auctions' Cost
The quantitative attribution of PJM's capacity-cost explosion to data-center load — the core "who pays" number for the Mid-Atlantic — is now official from the grid's own independent market monitor. Monitoring Analytics president Joseph Bowring told Utility Dive (July 20, 2026) that data centers are responsible for $6.3 billion, or 38%, of the $16.4 billion in charges from the 2028/29 base residual auction, and that across PJM's last four base auctions, data-center-driven capacity charges totaled $29.4 billion — 46% of the $63.6 billion total.
Bowring's framing is blunt: "PJM is continuing to act like it's business as usual... You have to open your eyes and recognize that it is really a paradigm shift, and failing to do that imposes costs on other customers." On the March 4, 2026 White House pledge by Google, Meta, and Microsoft to protect consumers from data-center-driven price hikes, he said meeting it "is impossible in PJM under its current rules — there's only one way to do what hyperscalers agree is the right thing to do, and that is to run a separate auction."
The backstop auction — mechanics confirmed. PJM's one-time Reliability Backstop Procurement opens September 30 and runs through October 21, 2026, with up to $20 billion available and a price cap of $555/MW-day — nearly 70% above the $325 cap on the regular auction. It exists because the 2028/29 BRA came up 6.8 GW short of the 20% reserve-margin target (second straight miss; only ~525 MW of new generation cleared, down from 774 MW the prior year). Results land December 2, 2026. PJM estimates the 2028/29 auction would have cleared near $555/MW-day uncapped — pushing total auction costs from $16.4B to nearly $30B. The clearing-price trajectory tells the repricing story: $28.92/MW-day (2024/25) → $329.17 (2026/27, a jump PJM's own analysis attributed 63% to data-center load growth) → $333.44 (2027/28) → $325 (2028/29, pinned at the cap).
What it costs a real customer. Unison Energy estimates a 10 MW industrial load's monthly capacity charge climbs from roughly $6,000 in 2024 to roughly $70,000 by 2028 — a more than tenfold increase driven almost entirely by the capacity price trend. That is the mechanism by which AI demand reprices every other electric bill in the footprint.
BYONC — the structural fix awaiting FERC. PJM's July 31 filing pairs the backstop auction with the Interim Resource Adequacy Service and a "Bring Your Own New Capacity" pathway: large loads of 50 MW+ connecting after June 1, 2027 must secure qualifying generation/storage or be treated as unsupported demand — first in line for curtailment in a grid emergency. The comment period closed September 3; the FERC ruling could come at any time (tracked in this topic's watch queue). NRDC's Tom Rutigliano called requiring data centers to bring their own power "the single best thing they could have done to stabilize the grid" — though whether ratepayers are held harmless "depends on decisions individual states still have to make about how the resulting costs get allocated."
Credit-market echo. Morningstar DBRS (July 2026) warned that "as states consider new taxes, restrictions, and moratoriums on data center growth, escalating stakeholder opposition could become a material credit factor" for data center projects — the de-rating documented in AI-Power Equity Trade: September De-Rating Meets an October Re-Rating — Paid for by Contracts, Not Forecasts now has a ratings-agency corollary.