FERC Orders All Six Grid Operators
- AI Energy Demand Data Centers FERC & Federal Policy & Markets Regulatory
Marin Holt
- 0
- 7 minutes read
- Issued: June 18, 2026
- Grid operators ordered: 6 (PJM, MISO, SPP, CAISO, ISO-NE, NYISO)
- Response deadline: 60 days
- Generation-adequacy report: 30 days
- Large-load threshold: 20 MW
The Federal Energy Regulatory Commission on June 18, 2026 issued tailored show-cause orders under Section 206 of the Federal Power Act to all six U.S. regional grid operators, giving each 60 days to either prove its current tariffs are just and reasonable for large energy users or file changes. The unanimous orders, filed in Docket RM26-4, target how data centers, manufacturing plants and other loads above 20 MW connect to the transmission system, and reach roughly 200 million people across more than 30 states plus Washington, D.C. — about two-thirds of the load served under FERC-jurisdictional rates.
What Actually Changed
Rather than open a slow national rulemaking, FERC used Section 206 to put the burden on PJM Interconnection, the Midcontinent ISO, Southwest Power Pool, the California ISO, ISO New England and the New York ISO, along with their transmission owners. The Commission found the six markets’ existing tariffs “appear to be unjust and unreasonable” because they lack clear provisions for large and co-located loads. Each order tees up five reform categories: efficient transmission study processes, preventing cost shifting with transparency into transmission costs, accommodating co-location and behind-the-meter generation, new transmission services for flexible large loads, and a process to study generators that serve electrically proximate large loads. Within 30 days, each operator must also file an informational report on how it will keep enough generation available to serve existing and new large loads.
What Did Not Change
FERC did not impose a single national rule or a uniform interconnection standard. The orders explicitly preserve region-specific market rules and anticipate different responses, citing progress already made under PJM’s December 2025 co-location order and SPP’s High Impact Large Load initiative. Existing deals are meant to be protected; the Commission framed the action as providing investor certainty rather than reopening signed agreements. The orders are informed by more than 3,500 pages of comments filed in the Department of Energy’s October 2025 advance notice of proposed rulemaking.
Enforcement Reality
A Section 206 show-cause order shifts the legal burden onto the grid operators: a tariff stays in place only if the operator successfully defends it as just and reasonable, otherwise FERC directs changes. The clock is real — 30 days for the generation-adequacy report, 60 days for the justify-or-refile response. Each filing then enters its own docket where intervenors, state commissions and load-serving entities contest the operator’s position before FERC acts. For data-center developers, the practical question is whether faster, clearer interconnection study rules emerge before contracted in-service dates, and who pays for the grid upgrades the new load triggers.
Why It Matters
The order converts more than a year of FERC signaling into binding deadlines. It follows the agency’s April 2026 statement of intent to act by June and resolves, for now, the uncertainty over whether FERC would issue a broad rule or move market by market. For load-serving utilities and large customers, the next 60 days set the terms for cost allocation, co-location treatment and study timelines that will govern AI-era demand growth.
Critical Perspective
Show-cause orders are a directive to respond, not a finished rule. The six operators will file divergent positions, and contested dockets at FERC routinely run past their nominal deadlines. Whether 60 days produces enforceable cost-allocation and co-location rules — or another round of comment-and-delay that pushes resolution into 2027 — depends on how aggressively the Commission rules on the filings it gets back.
