June 23, 2026 | Source: FERC — Show Cause Orders to the six RTOs/ISOs under FPA Section 206 (Docket Nos. EL26-67 through EL26-72), issued June 18, 2026
FERC Orders All Six RTOs to Justify or Rewrite Their Large-Load Rules in 60 Days
On June 18, FERC issued tailored show cause orders under Section 206 of the Federal Power Act to all six jurisdictional grid operators — PJM, MISO, SPP, CAISO, ISO-NE, and NYISO.
Each RTO/ISO and its transmission owners now have 60 days to either defend why their current tariffs remain just and reasonable, or file tariff changes governing how data centers, manufacturing, and other large loads connect to the grid.
The orders tee up five reform categories: efficient transmission service study processes, preventing cost shifting with transparent transmission costs, accommodating co-location and behind-the-meter generation, new services for flexible large loads, and a process to study generation serving electrically proximate and co-located loads. A separate informational report on generation adequacy is due within 30 days.
What It Means in the Control Room
This is a Section 206 action, not a request for comment. The burden now sits on each operator to prove its tariff is just and reasonable — a higher bar than a routine filing, and the clock is short.
For operators and transmission planners, the 30-day generation-adequacy report and the co-location/behind-the-meter provisions will reshape interconnection queues and study assumptions for any load above 20 MW. Compliance teams should expect tariff revisions, new study timelines, and cost-allocation language to move fast through stakeholder processes this summer.
Note who's not on the list: ERCOT, which sits outside FERC's jurisdiction. For the six that are, each order is tailored — so the reforms, and the risk of cost-shifting onto existing ratepayers, will look different in PJM than in SPP or CAISO. Knowing where your region stands against its peers is the difference between shaping the response and reacting to it.
EPG Solutions Can Help
When every RTO is filing different large-load reforms on the same 60-day clock, the teams that come out ahead are the ones who can see across regions — not just their own tariff. EPG's benchmark intelligence reports track how each grid operator is handling large-load interconnection, co-location, and cost allocation, so you can pressure-test your own position against the field before the deadline lands. Visit EPG Solutions → epgsolutions.services