AEP Ohio Data Center Tariff: 85% Minimum Bill Ratchet Cost Modeling Guide

The AEP Ohio Data Center Tariff is a PUCO-approved rate structure (effective July 23, 2025) that requires new data center facilities with loads over 25 MW to pay for at least 85% of their contracted electricity capacity each month for up to 12 years, regardless of actual consumption. The tariff includes a 4-year ramp-up period, an 8-year minimum commitment, and requires operators to post financial collateral. It was designed to prevent infrastructure cost-shifting from data centers to residential and commercial ratepayers.

The ratchet is most punitive during years 1-4 (ramp-up). A typical hyperscale facility brings capacity online in phases — utilization might be 20-30% in year 1, reaching 60-70% by year 3. Under the tariff, the minimum billing demand increases gradually but still far exceeds actual usage during early phases. For a 100 MW contract, this gap can represent $10M-$30M in unrecoverable costs over the ramp-up period. The previous framework used a 60% minimum, giving operators significantly more headroom.

If an operator exits after the 8-year commitment but before the full 12-year term, they may terminate with 3 years' notice or pay an immediate exit fee equal to 3 years of minimum charges. For a 100 MW facility at 85% minimum, this exit fee can range from $50M to $90M depending on contract capacity and rate structure. Early termination before the 8-year mark triggers the full remaining contract obligation. This is among the most restrictive exit provisions in US utility tariffs for data centers.

Behind-the-meter (BTM) generation is permitted but does not automatically reduce the minimum bill. Operators must declare BTM capacity in their Load Study Request before the Energy Service Agreement (ESA) is executed. If BTM generation fails, the customer must immediately trip an equivalent amount of load — there is no grid backstop without renegotiating contract capacity. BTM generation can offset energy costs but not capacity obligations unless explicitly structured in the ESA. The Data Center Coalition initially challenged these restrictions as violating Ohio law.

No. Cincinnati and southwest Ohio are served by Duke Energy Ohio, which is a separate utility from AEP Ohio. The AEP Data Center Tariff applies only within AEP Ohio's service territory (Central and Southern Ohio, including Columbus, New Albany, Dublin, and Licking County). Duke Energy has its own data center rates but without the 85% ratchet or 12-year lock-in. However, Ohio House Bill 706 (introduced March 2026) would extend AEP-style requirements to all Ohio utilities, potentially including Duke Energy.

PJM capacity auction prices hit historic highs: $329/MW-day for 2026/27 and $333/MW-day for 2027/28, up from $29/MW-day just two years prior. Data center demand drove 63% of this increase. The 85% minimum bill ratchet floors your capacity allocation at 85% of contracted load, meaning PJM capacity charges apply to that floor even if actual peak demand is much lower. For a 100 MW contract, this means ~$10.2M/year in capacity charges at the floor, regardless of utilization. Total all-in power cost in AEP Ohio now ranges $65-90/MWh.

The tariff requires data center operators to demonstrate financial viability and post collateral before service begins. Acceptable forms include corporate guarantees, letters of credit, or cash deposits. PUCO's order specifically requires the data center customer's financial sponsor to be a co-signer on the contract. This provision was added to protect AEP Ohio and its ratepayers from the risk of speculative projects that sign up for large capacity allocations but fail to materialize.

Yes. Ohio House Bill 706, introduced in March 2026 by bipartisan sponsors (Rep. David Thomas, R-Jefferson, and Rep. Tristan Rader, D-Lakewood), would extend AEP-style data center tariff requirements to all Ohio electric utilities. The bill mandates 12-year contracts, minimum billing provisions, and bans utilities from recovering data-center-caused costs from other ratepayers. If passed, this would eliminate Cincinnati's current advantage as a tariff-free zone within Ohio. The bill reflects growing bipartisan concern about data center impacts on Ohio ratepayers and communities.

The settlement was backed by AEP Ohio, PUCO staff, the Ohio Consumers' Counsel, Ohio Energy Group, Ohio Manufacturers' Association Energy Group, Industrial Energy Users-Ohio, Walmart, and Ohio Partners for Affordable Energy. It was opposed by the Data Center Coalition (representing Google, Amazon, Microsoft, and Meta), which argued the tariff unfairly singles out data centers, inflates costs, and imposes cumbersome regulation on behind-the-meter generation. Despite hyperscaler opposition, PUCO approved the settlement unanimously on July 9, 2025.