PJM Capacity Auction Falls 6.8 GW Short as Data Centre Demand Drives Q1 Power Prices Up 76%

PJM Capacity Auction Falls 6.8 GW Short as Data Centre Demand Drives Q1 Power Prices Up 76% A structural supply shortfall in PJM's latest capacity auction and record generator payouts signal that U.S. grid economics are being repriced around data centre load. PJM's latest capacity auction for the 2028/2029 delivery year came up 6.8 gigawatts short, as data centre load pushes the market toward supply constraints that price caps are increasingly straining to contain.⁶ Monitoring Analytics, PJM's independent market monitor, found that power prices in the region jumped 76% in the first quarter of 2026 on data centre-driven demand. Payouts to generators for the delivery year starting June 2028 matched the all-time high of $16.4 billion set in December, according to PJM.⁶ The clearing price structure makes the regulatory pressure legible. Absent a price cap, wholesale power would have settled 70% higher, at $554.72 per megawatt-day against the capped level of $325. The COMED load delivery area cleared at $776.69 per megawatt-day, well above the rest of the market.⁶ Behind those numbers sits a demand trajectory with no obvious near-term ceiling. Data centres now account for roughly half of all incremental electricity demand growth in the United States, according to the IEA's global energy assessment. Government estimates put data centre consumption at 4.6% of total U.S. electricity supply in 2024, a share that could nearly triple by 2028. Some technology companies say they are being forced to operate flexibly as they build sprawling facilities that can individually consume more power than entire cities.^5,2 The fuel mix underpinning that demand cuts against the clean energy commitments technology companies have built into their public positioning. Natural gas supplied more than 40% of the electricity consumed by U.S. data centres in 2024, while coal provided 30% of the global total, the International Energy Agency said. Carbon emissions at the largest operators confirm the direction of travel: Google's rose nearly 50% in recent years, Amazon's by 33%, Microsoft's by more than 23%, and Meta's by more than 60%, according to Fortune.² Grid infrastructure adds a separate constraint. The United States needs roughly 5,000 miles of additional high-voltage transmission, grid engineers have estimated, and permitting timelines with interconnection queues have not kept pace with data centre construction speeds. Battery storage firms report surging interest from hyperscalers but face lengthy grid connection queues and a supply chain heavily exposed to China, Reuters reported.^5,4 Capital has begun to reprice the supply-side beneficiaries. Battery storage specialist Fluence Energy saw its shares close at $24.16 on 8 May 2026, up 98.2% in a single week after disclosing master supply agreements with two hyperscalers and a record $5.6 billion backlog. The surge came despite the stock sitting roughly 39% below its start-of-year level. Quick Read Capital said it is rotating into energy companies positioned to supply data centre load, favouring nuclear and renewable baseload generation as the cleanest solution to the grid constraints driving the allocation.¹ BloombergNEF projects solar will become the largest U.S. power source by 2035, surpassing coal, oil, and natural gas. Some analysts forecast nationwide electricity use rising as much as 20% over the next decade, with data centres a significant driver of that growth.^3,2 The COMED zone's $776.69 clearing price, well above the $325 cap that covered most of PJM, is the most direct signal of where grid stress is concentrating now. Subsequent auctions will show whether new generation and storage can clear interconnection queues fast enough to close a 6.8 GW shortfall, or whether regulators face the harder choice of defending caps that mask an increasingly expensive physical reality.⁶