Getting a commitment for 40 MW is different from paying for 40 MW of energy. New data center tariff discussions increasingly focus on who pays for studies, network upgrades and capacity reserved for projects that may ramp slowly or never arrive.
This is a contract and tariff review checklist for large U.S. loads—not a replacement for a utility-specific legal analysis. Terms vary by state, utility, transmission operator and executed agreement.
What to include in the decision
- Separate the four documents that define the commitment
- Minimum bills shift ramp-up risk
- Security and upgrade responsibilities are not energy prices
- Confirm who has authority over the tariff
Separate the four documents that define the commitment
A development team should maintain a document register covering the applicable published electric tariff, the utility service or facilities agreement, interconnection or study terms, and any riders or special contract approved by the regulator.
A tariff may describe billing but not fully disclose construction-contribution amounts or scheduling milestones. The facility agreement may allocate upgrades, rights of way or security obligations. Never rely on a marketing letter alone to model service availability.
Minimum bills shift ramp-up risk
If the project reserves capacity before server deployment, a minimum billing demand may apply. Identify whether it is a fraction of contracted MW, a step-up schedule tied to commissioning, or a formula based on historic maximum demand.
A developer can be economically exposed even at zero IT utilization. Evaluate realistic occupancy at 0, 25, 50, 75 and 100% of planned site demand instead of pricing only a stabilized end-state.
Security and upgrade responsibilities are not energy prices
Deposits, letters of credit, refundable study advances, line extensions, utility-owned substations and dedicated equipment can create material cash requirements long before the first electricity invoice.
Assign responsibility for cost overruns, cancellation, regulatory changes, force majeure and whether another customer may later share infrastructure costs. These terms can matter more than a small change in cents per kWh.
Confirm who has authority over the tariff
Utilities and transmission organizations perform different functions. State commissions frequently oversee retail tariffs, while FERC has authority over many wholesale transmission matters. A single data center may be affected by both without there being a universal federal retail data center rate.
FERC’s June 2026 action addressed rules for integrating large loads across six regional system operators. Do not interpret that action as confirmation that any specific customer tariff has already changed; verify the operative filing and approval date.
Illustrative reservation mismatch
A 40 MW reservation with a hypothetical 75% minimum-billing-demand rule creates a 30 MW billable floor. If the site’s measured peak is 25 MW, the minimum adds 5 MW to the demand basis; the bill is not automatically 5 MW × energy price. Multiply the actual tariff demand rate by the defined billable kW and add energy and other line items separately.
A practical contract review sequence
First, identify the presently effective tariff sheet and every rider incorporated by reference. Next, map the timeline: application, deposit, study, construction, energization, acceptance, ramp and contract termination. Each event should have one owner, a defined evidentiary requirement and an estimated cash impact.
Then request a change-of-scope illustration from the utility. What happens when a planned 50 MW campus delivers only its first 10 MW hall, or when a phase shifts by 18 months? The answer should cover reservation reduction, construction contribution, refunds, security replenishment and rights to transfer capacity.
Finally, have engineering and commercial teams sign the same load schedule. An apparently minor difference between “MW at meter” and “MW critical IT” can materially change minimum charges and transformer sizing.
Example: reserved capacity versus delivered load
Assume a hypothetical utility agreement reserves 40 MW and sets minimum billable demand at 70% of the reserved amount. The minimum is therefore 28 MW even if a first-phase data hall initially draws only 10 MW. If the reservation-related tariff component were $5/kW-month, the illustrative minimum demand charge would be 28,000 × $5 = $140,000 per month before energy and other charges.
That scenario illustrates why a utility tariff cannot be screened using only the expected first-year kWh. Before signing, compare three ramp schedules: on-time build-out, a 12-month construction delay and cancellation of the final phase. Show the fixed minimum, construction contribution, deposits and exit liabilities separately in each case.
Do not assume that transmission, distribution, construction contributions and electric supply are governed by one document or regulator. A state utility tariff, a utility-specific service agreement and RTO/ISO market arrangements may interact; coverage and jurisdiction depend on the site.
Large-load commercial risk register
| Trigger | Financial question | Document to obtain |
|---|---|---|
| Application / reservation | Is the security refundable and under what condition? | Application, deposit agreement |
| Construction start | Who bears study changes and upgrade overruns? | Facilities / contribution agreement |
| Ready for service | Does billing start before customer acceptance? | Tariff, energization and acceptance clauses |
| Load under-ramp | What is the minimum billable kW or MW? | Rate schedule and contract riders |
| Termination / transfer | What fees survive cancellation or assignment? | Special service agreement |
Checklist for contract governance
Track milestones with an owner: utility study approval, deposits, transformer orders, easements, energization, meter acceptance and capacity ramp. Finance should certify all contractual minimums before a project team labels a phase “optional.” Include a revision history showing which load curve was sent to the utility and which the engineering design actually uses.
FERC announced large-load tariff review actions for regional operators in June 2026. That does not establish one national tariff or replace a local published schedule: always verify the presently effective instrument for the exact service territory.
Questions to ask before signing or building
- Is contracted capacity measured at the meter or IT bus?
- When does the minimum start: agreement execution, energization or commercial operation?
- What deposits and cancellation charges apply if a phase is delayed?
- How are interconnection upgrades, studies and substation assets allocated?
Methodology: illustrative figures are deliberately separated from sourced claims. Utility rates, commercial charges and engineering performance must be validated against site documents. Publication date: October 19, 2026.
Research and technical references
- FERC: June 2026 large-load tariff proceedings — background reference, not a project quotation
- US DOE: Utility Rate Options — background reference, not a project quotation