Today is the deadline for six grid operators to rewrite the rules on data center power. Here's what changes for your interconnection queue
FERC gave PJM, MISO, SPP, CAISO, ISO-NE, and NYISO until August 17, 2026 to defend or rewrite how they connect loads over 20 MW to the grid. For GCs and developers with a data center or advanced manufacturing plant in the interconnection queue, today's filings start setting the cost-allocation and timeline rules that decide when power actually shows up on site.
Today, six regional grid operators covering roughly 200 million people across more than 30 states and Washington, D.C. are due to file their answer to a blunt question from federal regulators: prove your rules for connecting big power users to the grid are fair, or rewrite them. What gets filed in the next few days will start shaping how long a data center or large manufacturing plant waits for power — and who pays for the grid upgrades to get it there.
What is actually happening today?
On June 18, 2026, the Federal Energy Regulatory Commission issued Section 206 show cause orders to PJM, MISO, SPP, CAISO, ISO-NE, and NYISO — the grid operators that run wholesale power markets and interconnection queues across most of the country. FERC's position: the existing tariffs governing how loads over 20 MW connect to the transmission system are presumptively unjust and unreasonable, given how fast data centers and advanced manufacturing plants are trying to get on the grid. Each operator got 60 days to either justify its current rules or propose a rewrite. That clock runs out today, August 17.
This isn't a niche filing. The 20 MW threshold sweeps in most data center campuses and any sizable industrial or manufacturing facility — the exact category of project that's been driving construction backlogs at Caterpillar, gas turbine makers, and generator suppliers for the past year.
Why does an interconnection tariff matter to a GC, not just a utility?
Because the tariff is what decides three things that land directly on a construction schedule and a client's budget:
- How long the interconnection study takes. FERC flagged slow, backlogged study processes as one of the five problems it wants fixed. A faster study process means a shorter gap between signing a contract and knowing your actual energization date.
- Who pays for grid upgrades. FERC's order specifically targets cost shifting — whether the cost of new transmission capacity gets allocated to the data center developer requesting it, or spread across all ratepayers. That number can be the difference between a project penciling out and getting shelved before a GC ever sees a bid package.
- Whether co-located and curtailable-load deals get clear rules. FERC is pushing operators to write explicit tariff provisions for loads that sit behind an on-site generator (co-located) or that agree to cut power draw during grid stress (curtailable), instead of leaving those arrangements to case-by-case negotiation.
What's the connection to on-site generation projects already underway?
That third point is the one worth watching closest. Developers who can't get a firm grid interconnection date have already been building around the problem — retrofitting bitcoin-mining sites with existing power hookups and ordering gas turbines years in advance specifically to avoid the queue. FERC's orders are effectively catching up to that trend: instead of co-location staying an improvised workaround, the tariffs filed today start setting the actual rules — and the cost allocation — for connecting a data center to a generator on the same site rather than waiting in the transmission queue. For a GC building the switchgear, substation, and site electrical scope on one of these campuses, the shape of those rules changes what gets built and in what order.
What should a GC or developer with a project in one of these six regions do this week?
Nothing about a signed contract changes today. But for any project waiting on an interconnection study in PJM, MISO, SPP, CAISO, ISO-NE, or NYISO territory, it's worth a direct question to the utility or developer client: has today's filing changed the study timeline, the cost allocation for network upgrades, or the terms available for on-site generation instead of a grid-only connection. Those filings are public at FERC once submitted, and the answer will show up first in the docket, not in a press release.
If you have a data center, manufacturing, or other large-load project sitting in an interconnection queue in PJM, MISO, SPP, CAISO, ISO-NE, or NYISO territory, ask your utility contact this week whether today's FERC filing changes the study timeline or the cost split for network upgrades on your project.
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- What is FERC's large load show cause order?
- On June 18, 2026, the Federal Energy Regulatory Commission issued Federal Power Act Section 206 show cause orders to all six US regional grid operators — PJM, MISO, SPP, CAISO, ISO-NE, and NYISO — declaring their existing tariffs for connecting loads above 20 MW presumptively unjust and unreasonable, and giving each 60 days to either defend those rules or file replacements.
- What is the August 17, 2026 deadline specifically?
- August 17, 2026 is the 60-day deadline for each of the six grid operators to file its show cause response with FERC — either a filing showing its current large-load interconnection tariff already meets FERC's standards, or a proposed tariff rewrite addressing the issues FERC raised.
- Does this affect construction projects that aren't data centers?
- Yes. The 20 MW threshold covers any large load connecting to the transmission system, which FERC's order specifically names as including advanced manufacturing plants and other industrial facilities alongside data centers.
- Should a GC delay bidding a data center or large industrial job because of this?
- Not on this alone — the filings define the rules for future interconnection requests, not a retroactive cancellation of projects already in the queue. But a GC or developer with a project awaiting interconnection study in any of these six regions should ask their utility contact this week whether the queue's study process, cost allocation, or curtailable-service options are changing as a result of today's filing.
- What is co-located load and why does it matter for data center construction?
- Co-located load is when a data center or plant draws power directly from an on-site generator rather than solely through the transmission grid. FERC's orders push grid operators to write clearer rules for co-located and curtailable-load arrangements, which is the same behind-the-meter generation path GCs are already building for clients who can't get a grid interconnection date they can plan a schedule around.