# FERC required PJM to keep grid obligations visible when large loads co-locate with power plants.

A December 2025 FERC order directed PJM to create service paths for large co-located loads, require payment for grid services, and assign specified reliability-upgrade costs before existing generation can redirect capacity.

Canonical: https://brightaifuture.com/discoveries/ferc-pjm-colocation-cost-rules
Format: discovery
Source publication: 2025-12-18
Bright publication: 2026-09-19
Substantive update: None recorded
Evidence and review: Emerging; confidence: high; approved; ai-assisted. AI-assisted editorial comparison with the cited original and supporting public sources, bounded claims and explicit status labels. Bright did not independently audit the underlying records.

## The human problem

A large computing load placed beside a power plant may look isolated from the grid while still relying on transmission, backup supply, stability services, or generation that previously served other customers.

## The prior constraint

PJM did not have a complete tariff framework for multiple co-location arrangements, leaving cost, service, and reliability responsibilities contested.

## AI’s actual role

AI-related computing demand accelerated large-load co-location proposals; the documented result is a federal grid order, not a computing or customer-bill outcome.

## The documented result

On December 18, 2025, FERC directed PJM to establish new service options for co-located large loads. The order requires co-located load to pay for grid services it uses and sets conditions for reliability upgrades when an existing generator proposes to redirect capacity, including specified upgrade responsibility before capacity is removed from general service.

## Why it may matter

It replaces an “off-grid” shorthand with enforceable questions about which services remain shared, which upgrades are required, and who is responsible for them.

## Limitations

This is a policy and tariff-development order, not evidence that a household bill fell.

The result applies to PJM and cannot be generalized to every grid operator.

Later compliance filings and operating projects are needed to show how costs and curtailment work in practice.

## Unresolved questions

How will PJM’s final tariff allocate each upgrade and grid service across actual projects?

Which co-located loads will accept curtailment or firm-supply obligations?

What ex-post reporting will show effects on other customers and regional reliability?

## Provenance and history

{
  "dates": {
    "eventDate": "2025-12-18",
    "publicationDate": "2025-12-18",
    "captureDate": "2026-09-19",
    "lastReviewedDate": "2026-09-19"
  },
  "provenance": {
    "origin": "editorial",
    "externalId": "https://www.ferc.gov/sites/default/files/2025-12/E-1%20EL25-49-000.pdf"
  },
  "revisions": [
    {
      "id": "revision:data-centers-ferc-pjm-colocation-cost-rules-01",
      "recordedAt": "2026-09-19",
      "summary": "Published the federal order as a bounded cost-allocation and reliability rule, not as an observed customer-bill or operating-project outcome.",
      "sourceIds": [
        "source-ferc-pjm-colocation-order",
        "source-ferc-pjm-colocation-fact-sheet"
      ]
    }
  ],
  "corrections": []
}

## Original sources

- [FERC order on PJM co-located large loads](https://www.ferc.gov/sites/default/files/2025-12/E-1%20EL25-49-000.pdf)
- [FERC fact sheet on the PJM large-load order](https://ferc.gov/news-events/news/fact-sheet-ferc-directs-nations-largest-grid-operator-create-new-rules-embrace)

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