A Wisconsin docket now sets the clock on Oracle's $300 billion OpenAI backlog

Oracle shares fell 1.8% on Wednesday after Aterio, an infrastructure data provider, published its analysis of Project Lighthouse↗, the campus Vantage Data Centers is building for Oracle and OpenAI in Port Washington, Wisconsin ¹. The Vancouver-based firm sees material risk the 1.3-gigawatt site misses Oracle's second-half 2027 start, with meaningful load unlikely before mid-2028 ²³. The $15 billion project is not waiting on construction: permits are in hand, work has run continuously since December 2025, and satellite imagery shows two of the four halls enclosed ²³.

The power clock restarted in August

The campus cannot operate until American Transmission Co. builds a high-voltage interconnection, and that approval process has started over. ATC's first application spent ten months under review before the Public Service Commission of Wisconsin revoked its completeness finding on 6 August 2026↗, citing hundreds of post-filing changes to the project's scope; commissioners described a "moving target" ²⁴. Both ATC and the state's ratepayer watchdog called the unanimous revocation a first in recent decades, and ATC refiled in September for a $2.48–2.72 billion project across six counties with up to five new substations ⁵.

The rating cut has a Wisconsin price

S&P lowered Oracle to BBB-, one notch above speculative grade, on 9 July 2026, citing $90–95 billion of fiscal 2027 capex and a projected $42 billion operating cash deficit ⁶. Weeks later the commission declined to soften We Energies rules that would require Oracle to post a $7 billion letter of security↗ at more than $100 million a year, because any developer rated below A- must post collateral ⁷.

Oracle owns the buildings, and the commission owns the electrons

Oracle can enclose halls on its own schedule. It cannot schedule power. The $664 billion backlog, up 46% in a year with roughly $300 billion tied to OpenAI, is meant to convert half to revenue within 36 months ⁶, and Port Washington is one of the campuses built to carry that contract ³⁷.

Aterio's base case gives the site full capacity around October 2028; the 360-day review the Public Service Commission used in every comparable large transmission case Aterio reviewed pushes it to April 2029 ². Lenders have already marked the sibling campus: $18 billion of Jupiter loans trade at 89–91 cents on the dollar ⁶.

Oracle says nothing has slipped

On 24 September 2026 Oracle sent a force majeure notice on Project Jupiter, its New Mexico campus, that could defer rent payments to the developer for up to three years ²⁸. The company says Jupiter remains on schedule↗, that force majeure notices "do not, by themselves, establish a project delay or change delivery expectations" ⁸, and that neither site will touch fiscal 2027 guidance ⁶.

Oracle did not respond to requests for comment on Aterio's findings ¹. The commission, for its part, has ruled on whether ATC's filing was reviewable, not on the merits of the power line ².

19 October is the fork

The completeness decision expected around 19 October restarts a statutory clock: 180 days under Aterio's base case, 360 under its extension ². December's fiscal second-quarter report will then show whether the backlog is converting at the guided pace ⁶. The buildings will be ready first.