Flexibility Is the New Interconnection

CAISO will file a plan letting large loads connect before network upgrades finish — if they accept enforceable flexibility. PJM has a Large Load registry without a public queue. The wires are late; the contracts are changing.

Interconnection used to mean a study, a stack of network upgrades and a place in line. CAISO’s board just advanced a different bargain. On October 28 it moved a large-load proposal it will file with FERC by November 16. Large loads could connect before network upgrades are finished, in exchange for enforceable flexibility until the wires catch up. Participating transmission owners would study load interconnections on FERC’s 60-to-90-day clock (CAISO).

That is not queue magic. It is a contract that says the campus can turn down or shift when the grid needs it.

The public cannot see most of the line

In PJM, FERC on October 9 accepted the Large Load definition and registry effective October 12 and rejected the rest of the filing. The registry is not a public per-request queue. NYISO remains the only U.S. ISO with a public request-level large-load list (FERC via PJM).

So developers and buyers outside New York are still inferring wait times from IRPs, earnings calls and private utility talks. Analyses based on PJM data have put average time to commercial operation for projects that finished in 2025 around eight years in the interconnection queue. Process reform can compress study clocks. It cannot invent transformers, rights-of-way or community consent (Data Center Knowledge).

APS’s IRP shows the utility-side mirror: peak demand projected above 14.5 GW by 2041 versus a ~9.2 GW record, and new contract tools — minimum demand, collateral, exit fees — to keep unrealized loads from dictating the build (Utility Dive). Flexibility and collateral are cousins. Both exist because the old model — announce load, force the system to build, maybe show up — broke.

What “enforceable flexibility” means for a campus

If CAISO’s filing survives FERC roughly intact, a large load that wants early energization will have to prove it can curtail, shift or island on command. That collides with AI training clusters that hate interruption and with colo leases that promise four nines. The operators who can use it first are the ones with:

On-site generation that can island (fuel cells, recips, turbines)
Workloads that can pause or migrate (batch training, not every inference path)
Contractual rights with tenants that allow grid-driven curtailment
Batteries sized for ride-through, not just marketing

Google’s Wyoming approach — pay for the plant, pay for the infrastructure, air-cool the halls — is the extreme version of not waiting on someone else’s upgrades (Google). CAISO flexibility is the grid-operator version of the same idea: early electrons in exchange for behavioral obligations.

Behind-the-meter deals and co-location will keep rising where front-of-meter upgrades are the long pole. They bring their own regulatory fights — FERC already reshaped nuclear co-location economics in PJM — but the direction of travel is clear. Time-to-power is worth more than nominal tariff rate for many AI buyers.

Diligence questions that actually matter

Skip “what’s your queue position?” Ask:

Is the interconnect study complete, and which upgrades are funded?
Can we energize under an interim flexible arrangement, and what are the curtailment terms?
What on-site generation or storage backs those terms?
Does the tenant lease allow the curtailment the ISO will require?
Who pays if interim flexibility lasts longer than the upgrade schedule?

If the developer cannot answer those, you do not have an interconnection plan. You have a hope.

Opacity favors incumbents

As long as only NYISO publishes a request-level large-load list, incumbents with utility relationships and funded upgrade positions hold an information edge. Registries that are not public do not help a new entrant price wait times. CAISO’s faster study clock helps, but only after you are in the process. The practical response from well-capitalized buyers has been to own more of the stack — on-site generation, private laterals, credit wraps — so the ISO calendar is not the only calendar.

Expect litigators and consumer advocates to challenge flexible interim interconnection if they believe it shifts reliability risk or upgrade costs. Expect developers to market “CAISO-ready flexibility” as a product feature. The winners will be the ones who can prove curtailment capability without voiding the tenant SLA.

What to watch

CAISO’s FERC filing by November 16 and intervenor comments from load and consumer advocates.
Whether other ISOs copy flexible interim interconnection for large loads.
Any move toward public large-load queues outside NYISO.
Curtailment events on early flexible interconnects — the proof that “enforceable” means something.

Why it matters for builders, buyers and investors

The scarce product is not a study result. It is energizable megawatts on a date a tenant will fund. Builders who can offer flexible interim service plus on-site bridging will take share from pure queue squatters. Buyers should price curtailment risk into uptime SLAs. Investors should treat multi-year queue positions without upgrade funding or flexibility rights as options with a low strike probability.

Sources

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