AI data centers are the largest new source of electricity demand in decades, and the cost of serving them is landing on household bills. PJM's December capacity auction hit its price cap and, for the first time, fell short of its reliability target, with data center load the primary driver.
States are responding. Florida's SB 484, effective July 1, is the first binding statute aimed squarely at retail cost of service, following Texas's interconnection-focused SB 6. Every Florida utility must file its large-load tariff by October 1, 2026. Ten other states are moving through tariffs, rate cases, studies, and merger reviews.
Writing on deadline? Call 850.973.7687 or email mmcnees@fsu.edu. Fresh quotes tailored to your story, usually within the hour.
Framed and sourced so you can test them against your beat in under a minute. Every stat links to its primary source.
SB 484 requires utilities to prove that large loads pay their own cost of service, which audits what the utility charges the data center. It does not reach the price a utility pays its own affiliated generator, the seam between state cost-of-service review and federal wholesale oversight where excess can still flow into everyone's rates.
The peg: every Florida utility must file its large-load tariff for PSC approval by October 1, 2026. Florida Senate bill summary
October 1, 2026 is the deadline for public utilities to file compliant large load tariffs for Commission approval under s. 366.043(8), Florida Statutes. What lands that day is a filing, not a settled price. The rate-design question, what a 50 MW customer is actually charged and under which schedule, is decided separately in Commission proceedings that run on their own timeline. Duke's pending docket is the live example: its proposed policy defers the rate to a schedule that does not exist yet.
The peg: SB 484 (Chapter 2026-65) was signed May 7, 2026 and took effect July 1, 2026. It applies to large-scale data centers of 50 MW monthly peak load or more and prohibits shifting their costs to the general body of ratepayers. Enrolled bill text
PJM's independent market monitor found that data centers accounted for $6.5 billion of the $16.4 billion in costs from the December capacity auction, and $6.2 billion of that relates to data centers not yet built. If forecast load never materializes, the costs stay on household bills: a stranded-asset risk regulators are only beginning to stress-test.
The stat: $6.2 billion of December's auction costs trace to data centers that could come online by 2027/28 but have not been built. Monitoring Analytics report, via Utility Dive, Jan. 2026
Statutes in Texas and Florida. Commission tariffs in Pennsylvania and Wisconsin. A 45 percent data center rate proposal in Arizona. Merger review in the Carolinas, a study law in California, a rate-class fight in Virginia. The mechanism differs by state; the principle does not: load creators pay for the load they create. This is arriving on a bipartisan basis, and the state-by-state contrast is the story.
The peg: PJM's December 17, 2025 auction cleared at its $333.44 per MW-day cap and fell 6,623 MW short of its reliability requirement, a first. PJM news release · Full fourteen-state reference
Fourteen states with active state-level action on large-load cost allocation. Instruments range from binding statutes to open investigations, and the tracker labels each one.
Attribute to Dr. Mark R. McNees, Florida State University. Copy any quote with one click. Need a line tailored to your story? Call and I will give you a fresh one.
Load creators should pay for the load they create. When a data center triggers billions in grid investment and every household absorbs the cost, the market is not functioning. The fix is aligning incentives, not restricting commerce.
The cost of serving a data center does not show up as a line item on your bill. It arrives years later as a general rate increase, after the equipment is built into the rate base and earns a guaranteed return for thirty or forty years. By the time the bill comes, the decision that caused it is locked in.
Florida's SB 484 audits what the utility charges the data center. However, it does not reach the price the utility pays its own affiliated generator in the middle. The front door is guarded. The back door is the seam between state and federal review, and that is where the transfer price sits.
Florida passed a statute. Pennsylvania and Wisconsin moved through their utility commissions. Different mechanisms, one rule: data centers fund the capacity their demand requires. This is not an anti-growth position. It is market logic, and it is arriving on a bipartisan basis.
Each figure below was checked against the primary source linked under it. Dockets move quickly; the verification date is in the strip at the top of this page.
The regulatory seam in one image: what SB 484 audits, and what it does not reach. Run it with credit to markmcnees.com.
SB 484 requires the utility to disclose what it charges the large customer. This transaction is now audited.
The internal price the utility pays its own generator is set inside the same corporate family. SB 484's cost-of-service review does not reach it; oversight sits with federal wholesale rules. If it runs high, the excess flows into everyone's rates.
The front door is now guarded. The back door is a federal question no state audit reaches.
Dr. Mark R. McNees directs the MS in Social and Sustainable Enterprises at Florida State University's Jim Moran College of Entrepreneurship, where he is Sustainability Entrepreneur in Residence. His research and commentary cover the economics of who pays when data centers connect to the grid: utility rate structures, ratepayer cost shifting, and the state laws now reshaping who funds the buildout.
He has been quoted in national outlets on data center electricity costs and tracks large-load tariff dockets in fourteen states. He holds a doctorate in organizational leadership from George Fox University and a graduate certificate from Harvard University.
