The numbers are stated judgments. The record began on 12 October 2026 with starting confidences that a model set in a single reading, from its general knowledge and up to ten developments for each assessment retrieved in the three weeks before (some first reported earlier), and a published rule has made every change since. They are not measured probabilities. The question and the rule are fixed before the record begins, and each change shows its evidence and its reasons. The rule and what is not claimed are on the method page.

Main assessment

Grid power and interconnection are the binding constraint on US AI data centre buildout through 2027.

67.5% stated confidence, Likely (55–80%). Starting point on the record’s first day: Likely (55–80%), 67.5 per cent. Attention level: For information. Trend: Steady.

Key judgment

The judgment as stated before the record began

The scarcest input for a new US AI data centre through 2027 is a firm grid connection of the size it needs, at the time it needs it. Accelerators and financing can usually be arranged within months. Transmission upgrades, interconnection studies and large power equipment take years, and the order in which projects receive them is set by utilities, grid operators and regulators rather than by the buyers. The assessment would weaken if power stopped being the reason given when projects slip, or if on-site generation and flexible-load agreements began to deliver large campuses on schedule.

Starting point

How the record started this assessment

On 12 October 2026, before the record began, a model read the 10 developments below, picked from the reports retrieved in the three weeks before (some first reported earlier), and with its general knowledge chose Likely (55–80%) in a single reading. The record started the assessment at the middle of that range, 67.5 per cent. The reading is kept in the first day's record.

Its reason, machine-written by anthropic/claude-sonnet-4.6: Developments 6 and 9 show FERC ordering grid operators to reform large-load interconnection rules and Texas imposing new financial-assurance requirements on data centre connections, both pointing to grid capacity as an active constraint. Development 2 shows Duke Energy negotiating special cost-allocation terms with data centres, consistent with factor M2. Development 10 shows Oracle trucking in natural gas to bypass pipeline delays, illustrating factor M5 as a workaround that is costly and partial rather than a full substitute. Taken together, the evidence confirms power and interconnection are binding but not absolutely so, supporting likely rather than very likely.

Notes marked “Note” below were added for readers after the record began. They are not part of the sealed reading.

1. First reported 8 October 2026, 2 outlets.
“DOE presses PJM on ratepayer protections from large load costs | Utility Dive” · utilitydive.com · 8 October 2026 · Open the report
“DOE Presses PJM On Ratepayer Protections From Large Load Costs” · zerohedge.com · 9 October 2026 · Open the report
2. First reported 7 October 2026, 2 outlets. Cited by the reading.
“Duke Energy protects customers from data center costs” · wowktv.com · 7 October 2026 · Open the report
“Duke Energy strikes deal with data center giants” · axios.com · 7 October 2026 · Open the report
Note: When the update loop read this development on 10 October 2026, before the record began, it took it as a reason to raise this assessment, and its challenge step upheld that reading.
3. First reported 6 October 2026, 2 outlets.
“FERC Accepts and Suspends PJM’s Reliability Backstop Procurement Proposal, Establishes Paper Hearing Procedures, and Encourages a New Section 205 Filing | Troutman Pepper Locke - JDSupra” · jdsupra.com · 7 October 2026 · Open the report
“FERC Accepts and Suspends PJM’s Reliability Backstop Procurement Proposal, Establishes Paper Hearing Procedures, and Encourages a New Section 205 Filing” · lexblog.com · 6 October 2026 · Open the report
4. First reported 30 September 2026, 2 outlets.
“Amazon deal will enable $3 billion Calvert Cliffs investment, power data centers” · baltimoresun.com · 30 September 2026 · Open the report
“Amazon and Constellation sign 20-year nuclear power purchase agreement for 690 MW at Calvert Cliffs — Private Infrastructure Daily” · privateinfrastructuredaily.com · 5 October 2026 · Open the report
5. First reported 25 September 2026, 2 outlets.
“FERC rejects Oklo complaint seeking to reinstate project in PJM interconnection study cycle” · utilitydive.com · 25 September 2026 · Open the report
“FERC Backs PJM on Oklo Virginia Project, Finding No Rules Breach — EnergyReader.io” · energyreader.io · 29 September 2026 · Open the report
6. First reported 3 September 2026, 2 outlets. Cited by the reading.
“FERC orders all six US grid operators to justify or reform large electric load interconnection rules” · gcn.com · 30 September 2026 · Open the report
“Who Gets to Plug In: FERC's Rewrite of the Rules for Connecting Data Centers to the Grid · Inside the Datacenter” · insidethedatacenter.com · 3 September 2026 · Open the report
“Long Duration Energy Storage 2026 | FERC Orders RTO Reforms” · usa.long-duration-energy-storage-summit.com · 10 September 2026 · Open the report
Note: First reported on 3 September 2026, before the three weeks this reading drew on, which began on 21 September 2026. It was retrieved within them.
Note: When the update loop read this development on 10 October 2026, before the record began, it took it as a reason to raise this assessment, and its challenge step disputed that reading. The starting point is read without a challenge step.
7. First reported 11 October 2026, 1 outlet.
“Powering the AI revolution: Inside the grid, thermal, and interconnect challenges limiting data center growth” · techradar.com · 11 October 2026 · Open the report
8. First reported 10 October 2026, 1 outlet.
Headline not shown · news.cnyes.com · 10 October 2026 · Open the report
9. First reported 9 October 2026, 1 outlet. Cited by the reading.
“Why Texas Is Making Data Centers Wait” · zerohedge.com · 9 October 2026 · Open the report
10. First reported 9 October 2026, 1 outlet. Cited by the reading.
“Oracle Trucks in Natural Gas to Outrun Pipeline Delays at AI Data Centers” · webpronews.com · 9 October 2026 · Open the report

Uncertainty

Causes of uncertainty

Utilities and grid operators report requests for large connections in different ways, and a lengthening queue can reflect speculative or duplicate requests rather than real projects.
Most of the evidence arrives as news reports of announcements. An announced delay or an announced workaround is weaker evidence than a completed project.
On-site generation and co-location could relieve the constraint faster than grid upgrades, and their scale is not yet visible in public data.

What would change it

What would change the judgment

Several large campuses energized on or ahead of schedule without new transmission, using on-site generation or flexible-load agreements.
Utilities in the leading data centre markets reporting that large new loads are studied and connected within a year.
The largest spenders attributing their delays to the supply of accelerators or memory rather than to power.

Causal factors

The causal factors, and which way each one cuts

Factor	Which way it cuts	What evidence looks like	Last moved
M1. Waits for large grid connections How long a large new load waits between its request for a grid connection and energization, including the studies and network upgrades that stand in between. Longer waits mean power binds more tightly.	Supports. A stronger factor supports the assessment.	A utility or grid operator reports a longer study backlog or later in-service dates for large-load requests. A state regulator publishes the volume of data centre load waiting to be connected. A developer reports that its connection date has moved.	Not yet
M2. Special terms for large loads: tariffs, deposits and pauses Utilities and state regulators setting special terms for large new loads, such as minimum-demand charges, collateral, study deposits or pauses on new connections. These terms ration scarce connection capacity, and more of them means power binds more tightly. A pause that cites grid capacity bears on this factor. A pause that cites land use, water or noise bears on the local-permitting alternative instead.	Supports. A stronger factor supports the assessment.	A regulator approves a large-load tariff with minimum-demand or exit-fee provisions. A utility or grid operator requires deposits or collateral before it studies a large load. A state or utility pauses new large connections and cites grid capacity.	Not yet
M3. Projects delayed, reduced or moved because of power Announced delays, reductions in size or changes of site where the stated reason is the availability or timing of power.	Supports. A stronger factor supports the assessment.	A developer or cloud company says a campus will open later because its grid connection has slipped. A project moves to another state or region to obtain power sooner. A first phase is cut back to the power that will be available on opening.	Not yet
M4. Lead times for transformers, switchgear and turbines How long it takes to obtain the large equipment that delivers power to a campus. Longer lead times mean power binds more tightly, whatever the state of the grid itself.	Supports. A stronger factor supports the assessment.	A manufacturer or utility reports longer delivery times or sold-out capacity for large power transformers or gas turbines. A manufacturer announces new production capacity for this equipment, which bears on the factor in the other direction.	Not yet
M5. Ways around the grid: on-site power, co-location and flexible load Arrangements that let a campus draw power sooner than a conventional grid upgrade would allow, such as generation on site, siting beside an existing power plant or agreeing to curtail load at peak times. When these deliver large campuses on schedule, power binds less.	Weakens. A stronger factor weakens the assessment.	A regulator approves co-location of a data centre at an existing power plant. A campus is energized on on-site generation ahead of its grid connection. A utility offers faster connection in exchange for load that can be curtailed.	Not yet

Assumptions

What the assessment assumes, and what would break it

MA1. Requests for large grid connections in ERCOT, the US grid with the largest public queue of large-load requests, keep outrunning what can be connected.
Linchpin.
Invalidated if, in three consecutive monthly Large Load Interconnection Status updates published by ERCOT, the megawatts shown as approved to energize rise from the previous update while the megawatts shown as having planning studies approved fall. If ERCOT stops publishing these figures, the assumption is reviewed rather than invalidated.
Source: ERCOT, Large Load Interconnection Status update in the monthly report to the Technical Advisory Committee. The criterion’s fingerprint was fixed on 9 October 2026 and is part of the record’s first day.
MA2. Large power equipment stays scarce enough that delivery dates, rather than orders, limit construction.
Bridge.
Invalidated if the Bureau of Labor Statistics producer price index for power, distribution and specialty transformer manufacturing (series PCU335311335311) is lower than a year earlier in two consecutive quarterly averages.
Source: US Bureau of Labor Statistics, Producer Price Index by industry, via FRED. The criterion’s fingerprint was fixed on 9 October 2026 and is part of the record’s first day.
MA3. Ways around the grid do not yet deliver large campuses at scale.
Bridge.
Invalidated if, before the end of 2027, at least three US AI campuses first energized after 4 October 2026 are stated by their owner or operator (in an SEC filing, a press release, or a filing with a state utility or environmental regulator) to be operating at 500 MW or more, mainly on generation on the site or at an adjacent power plant.
Source: SEC EDGAR full-text search, Owners' and operators' press releases, and state utility and environmental regulator filings. The criterion’s fingerprint was fixed on 9 October 2026 and is part of the record’s first day.

Other explanations

The rival explanations

Evidence moves the assessment only when it bears differently on the assessment than on at least one of these. Evidence that fits them equally carries no weight.

MX1. The supply of advanced packaging and high-bandwidth memory is the binding constraint: accelerators cannot be produced fast enough, so connected power waits for chips.
This record can rarely test this explanation. Its scope leaves out reports that name the companies that make most advanced packaging and high-bandwidth memory, and the filter reads a report's summary, web address and outlet as well as its headline. So most reports that could favour this explanation are excluded before anything reads them, and the record can rarely see evidence in its favour.
No development was recorded on this assessment in the last 7 days.
Favoured by:
- The largest spenders say capacity is limited by the allocation of accelerators or memory rather than by power.
- Energized data centre space is reported as waiting for hardware.
- Accelerator makers report that they cannot meet orders into 2027.
Ruled out by:
- Lead times for accelerators shorten while projects keep slipping for power.
- Packaging and memory suppliers report inventory building up.
MX2. Capital is the binding constraint: the cost and availability of financing set the pace, and power follows money.
No development was recorded on this assessment in the last 7 days.
Favoured by:
- Projects are paused or cancelled citing the cost of financing.
- Data centre debt is repriced or pulled from the market.
- Spending outlooks are cut while power is available.
Ruled out by:
- Financing closes on schedule while energization dates slip.
MX3. Local permitting and community opposition, rather than grid capacity, is what slows buildout.
No development was recorded on this assessment in the last 7 days.
Favoured by:
- Pauses and zoning refusals cite land use, water or noise rather than grid capacity.
- Projects that have secured power are held up by local approval.
Ruled out by:
- Projects with local approval wait for a grid connection.

A development is recorded when the rule applies it to the assessment or sets it aside. Each count comes from the readings sealed with the changes, and a development set aside as fitting every alternative equally tells no alternative apart.

Evidence

Evidence behind changes in the last 30 days

Each item is a report or data series cited by a sealed change on this assessment. The update loop reads headlines and summaries, and no summary is shown as the evidence.

No evidence has been cited in the last 30 days.

Considered, set aside

Evidence considered and set aside

Developments the update loop read in the last 30 days and set aside because they fitted this assessment and each of its rival explanations equally. Under the rule such evidence carries no weight, so none of it moved anything.

Nothing on this assessment was set aside in the last 30 days.

Changes

Changes to this assessment

No change to this assessment yet.

The other assessments

The rest of the judgment

The question’s text on this page is as sealed on the record’s first day. Fingerprint . In the fingerprint of 12 October 2026, published on GitHub. Check it in your browser.