An AI data-center solution needs an agreed path from the utility connection and on-site power system to the electrical and cooling requirements of the computing equipment. A generator order, a proposed grid-service date and a cooling specification are separate inputs. They become an operating campus only when their interfaces and schedules are coordinated.

For developers evaluating sites or preparing equipment orders in 2026, the immediate task is to make those dependencies visible. Large-load tariff changes, reliability work and refrigerant requirements affect different parts of the project; none should be reduced to one national deadline or one assumed equipment lead time.

This guide provides a practical planning framework, with regulatory sources reviewed on September 24, 2026. The suggested work sequence is a procurement method, not a promise that permits, equipment or grid service can be secured within a fixed period.

Key Takeaways

  • Establish the campus’s electrical and thermal load requirements before comparing power packages.
  • Use the utility and regional process that applies to the site; RM26-4 does not create a universal project approval.
  • Distinguish an accepted tariff, a proposed reform and an executed service commitment.
  • Evaluate bridge generation against fuel, permits, integration and the possible duration of operation.
  • Check refrigerant requirements by equipment category and regulated activity, rather than assuming one deadline covers every chiller.

Start with a common electrical and cooling design basis#

Ask the IT, mechanical and electrical teams to produce one load schedule. It should identify the first phase, later expansion phases and the equipment that must remain available during the defined outage or maintenance events.

Specify the computing equipment’s expected electrical demand and acceptable power-quality limits. Obtain the vendor’s heat-removal requirements, coolant conditions and any facility-water interface requirements. An average rack-density benchmark is not a substitute for the equipment actually being installed.

The design basis should distinguish:

  • IT demand: the computing and networking load in each planned operating case.
  • Supporting loads: cooling equipment, pumps, fans, controls and other required services.
  • Distribution losses and auxiliaries: evaluated at the chosen measurement boundary.
  • Transient behavior: the load changes and transfer events the power system must accommodate.
  • Resilience objective: which equipment or distribution paths may be unavailable while required service continues.

Do not size backup generation simply by multiplying IT nameplate capacity by an annual power usage effectiveness figure. Annual energy efficiency and peak electrical demand answer different questions. Use a project load schedule and the applicable operating scenarios.

Uptime Institute’s Tier framework is useful when defining infrastructure resilience objectives. A count of spare generators alone does not demonstrate the maintainability or fault tolerance of the full system.

Identify who controls each part of the connection process#

Before treating a location as a viable power site, identify the serving utility, relevant transmission provider and regional grid operator, where applicable. Ask which studies and agreements govern the proposed load, any on-site generation and any export or parallel operation.

The federal large-load discussion is one part of this process. FERC’s RM26-4 proceeding began with the Department of Energy’s October 23, 2025 direction to consider an advance notice of proposed rulemaking. Its discussion of large loads generally above 20 MW should not be treated as a universal threshold governing every utility’s service process.

An advance notice gathers input; it is not itself an authorization to connect a project. Similarly, a site’s inclusion in a study does not establish the final upgrade cost or the date at which power can be delivered.

Request a connection record that includes the application status, study scope, service level, required upgrades, contractual milestones and conditions that could change the schedule. Separate preliminary indications from executed commitments.

Read regional actions alongside the current tariff#

FERC’s June 18, 2026 large-load actions directed six regional operators to justify or revise their tariff treatment. The covered regions are PJM, MISO, SPP, CAISO, ISO New England and NYISO. The initial response period has passed; current diligence needs the subsequent filings, applicable orders and effective tariff provisions.

Two earlier actions demonstrate why one national shorthand is inadequate:

For procurement, the practical output is a site-specific requirements list. Identify the applicable study fees and security, upgrade-cost responsibility, permitted import and export, curtailment conditions and milestones for service. Do not transfer a study-deposit amount from one region into another project’s budget without verification.

Where the project is negotiating an agreement during a tariff transition, have the responsible advisers confirm its treatment in writing. General policy statements about protecting existing projects are not a substitute for the terms that cover the actual agreement.

Compare power architectures against the same operating cases#

Use the same load, resilience objective and service date when comparing utility-led, on-site and hybrid approaches. Different assumptions can make one alternative look less expensive simply because it supplies less service.

Power architectures and questions to answer before selection

Architecture Questions to answer before selection
Utility service with emergency backup What utility capacity is contractually available, and what load must the backup system carry during an outage?
Phased utility service Which campus phases can operate at each service level, and what constrains subsequent expansion?
Sustained on-site or bridge generation What equipment duty, fuel supply, operating permission and maintenance arrangement support the expected duration?
Co-location with an existing plant Which grid-service and commercial arrangements apply during normal operation and plant outages?
Generation with battery support What event does storage cover, for how long, and how will the battery recharge?

Avoid treating “behind the meter” as a complete technical description. Show the physical connection, protection and operating modes on the one-line diagram. A system capable of utility parallel operation needs a different interface assessment from one designed to remain electrically isolated.

Where gas turbines and reciprocating generators are both candidates, compare site-rated net output, load response, maintenance, fuel and the included package. Do not scale a modeled utility plant’s cost per kW into a small campus installation and call the result a supplier quote.

Make bridge power a complete operating plan#

A bridge-power proposal should address the length of the bridge. Model a range of utility-service dates and identify what happens if the equipment must run longer than originally planned.

For each duration scenario, include acquisition or rental, mobilization, site work, fuel, maintenance, emissions controls where needed, staffing, demobilization and any credible residual value. Keep assumptions consistent across alternatives. A resale value is a sensitivity, not a guaranteed cash receipt.

Confirm the generator’s operating rating against the expected load profile and hours. Check fuel delivery or gas service, maintenance access, spares and how essential loads will be supported during an equipment outage.

EPA’s data-center air-quality resources identify applicable engine and turbine programs and the role of state and local permits. A planned bridge operation requires review of the actual operating case; calling it temporary does not establish that emergency-engine provisions authorize it.

SecondWatt’s mobile gas-turbine bridge-power guide provides related equipment considerations. Request a proposal for the required block size and supplied scope, then reconcile it with the site’s approvals and integration work.

Review cooling equipment by category and activity#

EPA’s HFC Technology Transitions tables list a 700 GWP limit and January 1, 2027 compliance date for the data-center, computer-room-air-conditioning and IT-equipment-cooling categories. The regulated activity differs: the product table addresses manufacture/import, while the systems table addresses installation of new systems.

Chillers have separate category entries and dates. The listed new-equipment restrictions do not impose a blanket requirement to replace every existing cooling system in 2027.

Ask the mechanical supplier to identify the applicable equipment category, refrigerant, GWP, regulated activity and compliance basis for each proposed item. Keep that confirmation with the submittal. For existing equipment or repair work, establish which provisions apply to the specific activity rather than assuming it is treated as a new installation.

Then coordinate the cooling design with the power schedule. Identify which pumps, controls and heat-rejection components must remain energized through an electrical transfer. Specify the thermal conditions the equipment must maintain during the project’s defined events. A resilient electrical supply is insufficient if a supporting cooling component cannot operate through the same event.

Prepare for reliability requirements without inventing an effective date#

FERC’s July 16, 2026 directive in RD26-7 requires NERC to submit computational-load reliability standards and related procedure changes, including registry criteria, by December 31, 2026. Submission does not automatically make every proposed requirement effective the following day.

For equipment procurement, preserve the information needed to assess the campus’s response to grid disturbances. Ask vendors for relevant models, protection settings, load-response data and control descriptions. Assign responsibility for combining those inputs into the site studies required by the applicable provider or reliability process.

In particular, document how the UPS, storage, generators and large loads respond during voltage disturbances, transfers and restoration. Specify the behavior needed at the utility interface rather than assuming that independently acceptable components will produce an acceptable combined response.

Track the adopted standards, covered entities and implementation timetable as they develop. Contract language should identify responsibility for providing the necessary technical information and assessing changes that affect the project.

Order equipment against defined interfaces#

The most useful long-lead procurement list identifies both the equipment and the decisions needed to release it.

Long-lead equipment and quotation inputs

Equipment or package Inputs needed for a useful quotation
Transformers Voltage ratio, rating, impedance, cooling, connection, taps and project requirements
Switchgear One-line diagram, voltage, bus rating, fault duty, breaker arrangement, protection and controls
Generator or turbine package Net site output, duty, fuel, frequency, voltage, emissions configuration and included auxiliaries
UPS and battery systems Critical load, duration, operating reserve, recharge requirements and control interfaces
Cooling plant Thermal duty, fluid conditions, electrical loads, refrigerant compliance and resilience requirements

Get dated lead-time statements for the proposed configuration. Identify whether each date means engineering completion, factory readiness, shipment, site delivery or commissioned operation. A market-average lead time cannot establish any of those milestones for an individual order.

For used equipment, add an inspection and modification schedule. Confirm the exact asset, available records and preservation condition. SecondWatt’s generator procurement guide and used-generator checklist cover related sourcing questions.

A practical first-90-days work plan#

The following sequence organizes early diligence. Some items can run concurrently, and external studies or approvals may extend well beyond it.

Days 1–30: establish the design and site evidence. Assemble the phased load schedule, resilience objective, cooling requirements and preliminary one-line diagram. Identify the serving entities and applicable connection processes. Request available utility, site, fuel and permit records. Maintain an assumptions register with a named owner for each open item.

Days 31–60: compare feasible operating cases. Obtain budgetary equipment and integration proposals against the same specification. Examine utility-led, phased-service and on-site options where relevant. Begin the necessary engineering and permitting evaluations. Build cost and schedule scenarios around identified uncertainties instead of assigning an unsupported universal lead time.

Days 61–90: prepare justified commitments. Update the comparison with supplier clarifications and available study results. Identify which equipment interfaces are sufficiently defined for an order, which commitments require conditions and which unresolved issues prevent release. Agree on testing responsibilities and acceptance criteria before the scope is divided among contractors.

The output should be a decision package: design basis, equipment schedule, approvals register, cost comparison, operating narrative and a list of unresolved dependencies. It should make clear what the team knows, what remains conditional and who must resolve it.

To begin a sourcing discussion, contact SecondWatt with that design basis, the project location and required in-service date. A precise requirement makes it easier to assess whether a particular offered asset can contribute to the project schedule.

Frequently asked questions#

What should an AI data-center power plan include?#

A phased load schedule, utility-service plan, backup or on-site generation strategy, cooling interfaces, fuel arrangements, approvals and commissioning requirements. The components should be evaluated as one operating system.

Does RM26-4 guarantee faster utility service?#

No. A federal proceeding does not establish a project-specific service date. Use the applicable regional and utility process and the conditions in the project’s agreements.

Is SPP the only region with an established large-load approach?#

That is not a defensible conclusion from the cited SPP approval. Regional frameworks and proceedings differ, and their current provisions must be checked for each site.

Can emergency generators run a campus until grid service arrives?#

Only if the equipment duty and applicable operating approvals support the proposed use. Planned bridge operation should not be assumed to qualify as emergency operation.

Must all data-center chillers be replaced in January 2027?#

No. The HFC requirements distinguish equipment categories and regulated activities. Review the proposed equipment or work against the applicable rule rather than applying one date to all installed cooling equipment.

Should every equipment order wait for regulatory proceedings to finish?#

Use project-specific release criteria. Some work may proceed with established requirements, while other orders need unresolved interfaces or approvals clarified. Document the assumptions and contractual treatment of changes before committing.