Oracle’s Project Lighthouse in Port Washington, Wisconsin, could receive customer-ready power later than its reported second-half 2027 target because a new high-voltage transmission connection still needs regulatory approval and construction. Aterio’s base-case estimate puts partial power around December 2027 and full site demand around October 2028, but those are modeled dates—not commitments from Oracle, the developer, utility or regulator.
Why a construction-ready campus can still wait for power
Project Lighthouse is a four-building data center campus being developed by Vantage for Oracle. Construction can progress while the separate grid connection remains unresolved: the campus needs a new high-voltage transmission connection, and the Wisconsin Public Service Commission (PSC) must approve it before American Transmission Company (ATC) can build the connection. Aterio reported that the original PSC review was closed after the commission withdrew its completeness finding, and that ATC refiled in September 2026. Aterio described the regulatory process as restarted even as campus construction continued. Aterio’s September 29, 2026 report
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That sequence creates schedule risk, not proof that Oracle will miss its target. Aterio’s Head of Data Center Research, Javier Reyes, said: “Based on the public record, we see a meaningful risk that load arrives later than Oracle’s current guidance.” No direct schedule statement from Oracle, Vantage, ATC or the PSC was captured in the cited coverage.
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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsWhat the 1.3 GW figure means
The campus is described as requiring 1.3 gigawatts of total electrical demand, but that is not the same measure as its computing capacity. Aterio attributes 902 megawatts of critical IT load to the developer; utility and environmental records cited by Aterio describe 1.3 GW of total demand, including cooling and other site uses. The figures refer to different parts of the facility’s electrical needs, rather than conflicting estimates of the same capacity. Business Wire/Aterio, September 30, 2026
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When could the campus receive power?
Aterio modeled three timelines from public filings, state law and earlier PSC cases. Its analysis reviewed filings through September 24, 2026. The estimates are not official dates or commitments by project parties or the regulator. “Partial power” does not mean that the full campus is energized.
| Aterio scenario | Partial power estimate | Full 1.3 GW estimate | Context |
|---|---|---|---|
| Earliest legal path | October 2027 | August 2028 | Aterio calls this unlikely because comparable Wisconsin cases have not moved this quickly. |
| Base case (180-day decision) | December 2027 | October 2028 | Modeled scenario; Aterio expects customer load to ramp mainly from Q1 2028 after commissioning. |
| Extended review (360 days) | June 2028 | April 2029 | Aterio says the PSC used its extension in every comparable large transmission case it reviewed. |
Aterio’s scenario analysis and its summary of the estimates set out these alternatives. They show why a 2027 customer target may be at risk, but they do not establish when the PSC will decide or when Oracle will begin serving customers.
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Why first power is not the same as customer delivery
Even after grid power becomes available, the data center’s electrical and cooling systems need to be energized, tested and commissioned before they can support customer workloads. The Register reported that Aterio’s base scenario expects load to ramp mainly from the first quarter of 2028, following commissioning. The Register, October 2, 2026
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So there are distinct milestones: approval and construction of the transmission connection; partial grid service; full site power; and commissioning and customer load ramp. A date for one milestone does not establish the date for the next.
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What is known—and what remains uncertain
The available reporting establishes the basic source of risk: a large new transmission connection requires a regulatory process that restarted after the initial case was closed. Aterio’s timelines are useful as scenarios, while its own account characterizes the earliest path as unlikely and identifies longer review as a material possibility.
TechRadar Pro reported that ATC filed 564 additional documents during the review period. That count is reported by TechRadar and is not independently verified here against the underlying docket. TechRadar Pro, October 4, 2026
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The practical conclusion is narrower than saying the campus definitely will be late: construction progress does not resolve the separate transmission approval and build schedule, and the available estimates leave open outcomes from partial power in late 2027 to a later ramp if review takes longer.
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