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What determines who pays?
Start with the purpose of the upgrade. A line, substation, or other network improvement identified as necessary to provide a particular customer’s requested transmission service may be assigned to that customer—or to the utility or transmission customer serving it—under the governing tariff or a cost-recovery agreement. A regional facility planned to serve several customers can instead be considered through a regional planning and cost-allocation process.
Those categories do not by themselves settle a project’s bill. The tariff and contract determine details such as payment timing, security, responsibility for cost overruns, and whether a customer may receive credits if other beneficiaries later use the facilities. The U.S. Department of Energy (DOE) identifies fair allocation, the risk of underused or “stranded” investments, operational and resource-adequacy concerns, and risk-sharing for emerging technologies as issues in large-load rate design.
That means the answer to “Will my electricity bill pay for a new data center’s power lines?” is: it depends on the facilities and the rules that apply. Retail customers may bear some system costs through rates, but the available federal materials do not establish that every data-center-related upgrade is passed to household bills—or that every upgrade is paid entirely by the data center.
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How the main funding approaches differ
| Approach | How costs may be allocated | What it does not guarantee |
|---|---|---|
| Customer-specific upgrade or cost-recovery agreement | A tariff or agreement can make the customer, or the transmission customer serving the load, responsible for costs incurred to provide the requested service, including network upgrades. | There is no universal payment schedule, security requirement, overrun rule, or later-credit policy; those depend on the applicable tariff and agreement. |
| Large-load rate or special contract | A utility’s rate design or an approved contract can assign system costs to a large load and address the risk of utility investment becoming underused. | A special contract is not necessarily available or approved in a particular service area. DOE identifies these as rate-design issues, not as one nationwide contract template. |
| Regional transmission project | Where a facility is selected through regional planning, costs may be allocated among customers or other beneficiaries under the relevant process. | A data center is not automatically the only beneficiary or automatically exempt from costs. The process determines beneficiaries and allocation. |
| Flexible or interim non-firm service | A customer willing to limit withdrawals or accept non-firm service may be considered for different service terms, which can affect when and how it receives service. | Flexibility does not automatically erase upgrade costs or provide the same service rights as firm service. |
| Co-located generation | A data center located with a generator may seek a transmission arrangement different from a conventional front-of-meter load. | Co-location does not by itself eliminate transmission, reliability, or cost-allocation obligations. |
For large-load rates, DOE also notes that customers’ needs differ: some may seek to match consumption with carbon-free resources, while others may use on-site generation to provide capacity. Those choices can affect the rate-design discussion, but do not determine a project’s approved charges on their own.
What regional planning can change
FERC Order No. 1920 sets a framework for longer-term regional transmission planning. Its 2024 fact sheet describes a planning horizon of at least 20 years, plan updates at least every five years using at least three scenarios, and cost-allocation processes for selected facilities. The framework also describes a route for states or interconnection customers to fund some or all of facilities that otherwise would not meet selection criteria.
Regional planning matters when an upgrade supports more than one customer or system need. A data center may be one beneficiary among several; the actual allocation depends on the relevant regional process and how benefits are assessed. The planning horizon and scenario requirements are process rules, not estimates of how much a data center will use or how much an upgrade will cost.
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What co-location and flexible service mean in practice
Putting a data center next to a power plant changes the service arrangement being considered; it does not make grid impacts disappear. FERC’s PJM fact sheet describes network integration service, interim non-firm service, and firm or non-firm contract-demand service options for co-located loads. In specified circumstances, interim non-firm service can be available while network upgrades needed for requested network service are completed.
These distinctions affect timing, curtailment exposure, and the service rights a customer receives. Reliability, transmission use, the possibility that generation is displaced from other customers, and who pays for related upgrades remain relevant. The specific options described in the PJM fact sheet concern PJM; they should not be assumed to apply identically in every region.
What FERC is considering for large loads
FERC’s RM26-4 docket, described on its page as an advance notice of proposed rulemaking process, asks whether large loads and co-located facilities should pay the full cost of grid upgrades needed for interconnection and whether those costs should be credited back over time. The docket page generally describes large loads as demand greater than 20 megawatts. These are questions for consideration, not a settled rule requiring full payment or later credits in every case.
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On June 18, 2026, FERC issued tailored show-cause orders to all six regional grid operators under its jurisdiction: PJM, MISO, SPP, CAISO, ISO New England, and NYISO. The orders asked each operator and its transmission owners to justify existing tariff arrangements or propose changes within 60 days, and required an informational report within 30 days on generation adequacy for existing and new large loads. The release identified study processes, protection against cost shifting, transparency, co-location, flexible service, and studies for nearby generation and loads as areas for attention. The orders started or advanced tariff work; they did not establish one final nationwide allocation rule. The stated deadlines do not show what was filed or decided afterward, so current outcomes require checking subsequent filings.
FERC said in the June 2026 release that “a one-size-fits-all solution is not the current most efficient solution” for integrating large energy-intensive loads. That is the Commission’s policy statement, not a finding that any particular allocation method will suit every project.
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- FERC regulates interstate transmission and reviews regional transmission tariffs and planning frameworks.
- RTOs and ISOs administer regional processes and tariffs under FERC oversight; transmission owners participate in those arrangements.
- State or local regulators generally address retail rates and distribution service. A data center’s transmission costs and the local utility charges appearing in customer bills can therefore involve different rules and proceedings.
The relevant jurisdiction can differ across parts of the same project. A wholesale transmission tariff does not by itself answer how a state-regulated utility will recover distribution or retail costs. DOE frames large-load rate design as a discussion involving utilities, regulators, large-load customers, and other stakeholders.
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What to check for a specific project
Before drawing a conclusion about who ultimately bears an upgrade’s cost, identify the project’s service territory and the exact service being requested. The useful records and questions are:
- Load and service request: What megawatt demand is requested, and is the customer seeking firm, non-firm, or another form of service?
- Study results: Which network upgrades do the studies identify as needed for that service, and which facilities appear to benefit multiple customers?
- Governing rules: Which transmission tariff, state commission orders, distribution rules, and interconnection agreement apply?
- Cost and risk terms: What estimates, deposits, security, milestones, cost-recovery commitments, or provisions for later beneficiaries are specified in the agreement?
- Public information and status: Can affected customers inspect the upgrade list and cost estimates, and what is the current status of relevant regional and FERC proceedings?
A June 2026 FERC filing discusses searchable public information about network upgrades and their costs, as well as cost-recovery agreements intended to make customers taking service for large loads responsible for service costs, including network upgrades. Transparency can help ratepayers understand what is being built and how costs are assigned; the applicable tariff and agreement still determine the actual obligation.
The federal sources discussed here do not establish rules for every state, municipal utility, electric cooperative, or country, and they provide no substantiated general dollar estimate for data-center grid upgrades. Costs and obligations must be evaluated project by project.
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