Power & Policy No. 03 · State · State public utility commissions
State commissions are writing separate tariffs for very large loads
Rather than serving gigawatt-scale customers under existing industrial rates, a growing number of state commissions have approved or opened proceedings on dedicated large-load tariffs with minimum take, longer terms, and exit protections.
- Utility interconnection
- Data-center tariffs
- Demand response
Not legal advice
This series is published for general information. It is not legal advice, regulatory advice, or tax advice, and it does not create any professional relationship. Rules change, apply differently by jurisdiction, and turn on facts specific to each project. Consult qualified legal, regulatory, and tax counsel before acting.
The Intelligent Infrastructure Review · Published August 1, 2026 · Record checked August 1, 2026 · 12 min read
In this installment
Minimum demand charges, ten- to twelve-year terms, collateral, and exit fees are becoming standard conditions of service for very large loads — and they reshape the financial model of a campus more than most technical decisions do.
Policy or regulatory development
State utility commissions have been approving new rate classes specific to very large customers, most visibly data centers. A widely cited example is the Public Utilities Commission of Ohio's July 2025 decision on AEP Ohio's data-center tariff, which approved a settlement establishing a separate class with minimum-take obligations, a multi-year term, and financial assurance requirements. Similar proceedings have been opened or decided in other states, with terms varying by jurisdiction.
Jurisdiction
Level
State
Authority
State public utility commissions
Where it applies
Retail electric service by regulated utilities within a state. Terms are set utility by utility in individual rate proceedings, so the applicable conditions come from the specific tariff on file in that service territory — not from any national standard.
Who is affected
- Data-center and AI infrastructure developers
- Service above a stated size threshold is taken under a distinct tariff with obligations that persist regardless of how much energy the campus actually uses.
- Other large industrial customers
- Thresholds are typically size-based rather than industry-based, so manufacturing, cold storage, and other large loads can fall into the same class.
- Utilities
- The tariff is the mechanism for recovering the cost of infrastructure built for a single customer whose load may not materialize as forecast.
- Existing ratepayers
- Minimum take and exit provisions exist to reduce the risk that residential and small commercial customers absorb stranded cost.
- Investors and lenders
- A long-term minimum payment obligation is a fixed liability that has to be modeled, secured, and disclosed.
What changed
- A separate rate class applies above a stated load threshold, replacing service under general industrial rates.
- Minimum demand or minimum-take provisions require payment on a share of contracted capacity whether or not the load consumes it.
- Contract terms extend well beyond typical commercial agreements, commonly a decade or more, plus a notice period before termination.
- Financial assurance — collateral, letters of credit, or credit tests — is required before infrastructure is built.
- Exit fees or continuing obligations apply if the customer leaves early or fails to reach the contracted load.
- Some tariffs and settlements pair these obligations with curtailment, flexibility, or bring-your-own-generation provisions that can improve the terms available.
Official sources
- Public Utilities Commission of Ohio · PUCO case docket — AEP Ohio data center tariff proceeding · July 9, 2025 · Case No. 24-508-EL-ATA
- U.S. Department of Energy / Lawrence Berkeley National Laboratory · 2024 United States Data Center Energy Usage Report · December 1, 2024
Why it matters
These provisions convert an operating expense into something closer to a long-term fixed obligation. A campus that plans to ramp over five years may be paying on capacity it has not yet used from the first year of service, and the total committed value over a twelve-year term can rival a major equipment package. The commercial terms of service are now as consequential to the project model as the engineering, and they are typically negotiated at the same time as the interconnection discussion, when the sponsor has the least information about final load.
Potential project impacts
Financial model
Minimum take turns forecast error into direct cost. Overstating the load to secure capacity creates a payment obligation on capacity the project never uses.
Phasing
Tariff structure often determines whether a campus is better contracted in phases with separate ramps than as one large block.
Balance sheet
Collateral and credit requirements consume capacity that would otherwise support construction financing, and the obligation may need to be disclosed as a long-term commitment.
Design
Where a tariff rewards curtailability, on-site generation, or storage, the technical design and the rate outcome stop being separate conversations.
Site comparison
Two sites with similar energy prices can differ substantially once minimum take, term length, and exit provisions are priced in.
Timing and implementation considerations
Ohio decision
July 2025The Public Utilities Commission of Ohio issued its decision approving a settlement on AEP Ohio's data-center tariff, one of the most cited templates in subsequent proceedings.
Other state proceedings
Ongoing, state by stateAdditional states have opened or decided their own large-load proceedings on separate schedules. There is no common effective date.
When it binds a project
At contract executionTerms generally attach when the service agreement is executed, which is often well before construction. That agreement, not the tariff summary, is the operative document.
Rehearing and appeal
VariesCommission decisions can be subject to rehearing and appellate review, and tariffs are periodically revisited in later rate cases.
Risks and uncertainties
Terms are not portable
What was approved in one state says little about what a commission in another state will accept. Underwriting one jurisdiction's terms against another's precedent is a common error.
Load forecast risk
The obligation is set against contracted capacity. If the compute build-out slows, the payment does not.
Moving target
Many of these tariffs are new and will be revisited. Provisions on flexibility, co-located generation, and cost allocation are actively contested.
Definitional exposure
Thresholds and definitions determine which class a project falls into, and a modest change in contracted capacity can move a project across a line.
Questions project teams should ask
For your regulatory counsel
- Which tariff and which currently effective version would apply to our load in this service territory?
- What exactly triggers the minimum-take obligation, and how is contracted capacity defined and measured?
- What are the termination, assignment, and exit provisions if the project is sold, resized, or delayed?
For the utility
- How is the ramp treated — can contracted capacity step up in phases matched to our build?
- Do curtailment, demand response, or on-site generation commitments change the terms available to us?
- What financial assurance is required, in what form, and at what point in the process?
For your own team
- What is our confidence interval on load at year three, and what does the minimum take cost us at the low end?
- Have we compared candidate sites on total committed cost over the full term, not just on energy price?
- Is our design capable of delivering the flexibility that could earn better terms, and can we commit to it contractually?
GRIDSTROM perspective
GRIDSTROM perspective · opinion, not reporting
We see these tariffs as a rational response to a real problem: utilities are being asked to build for loads that may not arrive as forecast, and someone has to carry that risk. The mistake we see most often on the developer side is treating the tariff as a procurement detail handled late, after the campus is designed. By then the contracted capacity is set and the flexibility that could have earned better terms was never engineered in. The projects that come out ahead treat rate structure as a design constraint — sizing the request honestly, phasing the ramp, and bringing genuine curtailability or on-site supply to the table as something they can commit to rather than something they hope to offer later.
This series is published for general information. It is not legal advice, regulatory advice, or tax advice, and it does not create any professional relationship. Rules change, apply differently by jurisdiction, and turn on facts specific to each project. Consult qualified legal, regulatory, and tax counsel before acting.
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