AEP Ohio Data Center Tariff Approved to Mitigate Ratepayer Risk
In July 2025, the Public Utilities Commission of Ohio (PUCO) adopted a landmark settlement establishing AEP Ohio's 2024 Data Center Tariff (DCT). This tariff represents a major shift in how utilities and regulators allocate the infrastructure costs of rapid AI load growth, moving away from socialized cost models to strict, cost-causation-based rate designs.
Under the approved tariff, which went into effect on July 23, 2025, new or expanding data center facilities with a demand exceeding 25 MW must commit to long-term contract structures and high take-or-pay thresholds:
"AEP Ohio's proposal approved by the PUCO requires large new data center customers to pay for a minimum of 85% of the energy they are subscribed to use."
This "take-or-pay" mechanism requires data centers to cover at least 85% of their highest contracted demand monthly, even if their actual consumption falls below that level. Additionally, the tariff incorporates:
- Contractual Commitments: An 8-year minimum contract term.
- Financial Security & Exit Fees: A 36-month exit fee provision and upfront Contribution in Aid of Construction (CIAC) requirements to pay for dedicated substations, lines, and transformers.
These protections are designed to insulate residential and small business ratepayers from the risk of speculative overbuilding. If a data center developer fails to complete a project or exits the region early, the exit fees and take-or-pay obligations ensure that the utility's capital investments are not stranded and subsequently shifted onto ordinary consumers.
This tariff has set a powerful national precedent. Between 2018 and 2026, at least 38 new large load tariffs were established across the United States to manage data center load impacts—with 30 of those tariffs implemented in 2025–2026 alone, underscoring the rapid adaptation of state regulatory commissions to the AI infrastructure buildout.