Prologis has filed city planning documents for a 516,000-square-foot, 99-megawatt data center in South San Jose — but the site's only existing environmental clearance covers a 281,873-square-foot warehouse approved in 2022, leaving the project's regulatory path unresolved.

Prologis has filed plans with San Jose city planners for a three-story, 516,000-square-foot data center at 5977 Silver Creek Valley Road in South San Jose — a 99-megawatt facility with its own onsite substation, a dedicated generator yard, and a second independently routed transmission line the company says it will fund itself. The proposal, first reported by the Mercury News on July 8, represents one of the larger single-site data center bets a mainstream real estate firm has placed in the South Bay.

The document trail tells a different story than the press language suggests. The only environmental review on file for that 15-acre parcel is a city-issued Negative Declaration from September 2022 — File No. H21-047 — that cleared a 281,873-square-foot industrial warehouse, not a data center. The current proposal is nearly double that footprint and carries power and cooling demands that weren't contemplated in the 2022 analysis. As of the Mercury News report's publication, no new or supplemental CEQA review for the data center use had been publicly announced, and San Jose's Planning, Building and Code Enforcement department had not confirmed any hearing dates.

Prologis acquired the site as part of its $23 billion purchase of Duke Realty in 2022. Duke Realty had bought the parcel in 2021 for $40.2 million in an all-cash deal from Palo Alto-based Peery Arrillaga, per the Mercury News. The site's proximity to an existing PG&E substation at 6402 Santa Teresa Blvd. — which PG&E recently doubled to 80 megawatts in capacity and has engineered for further expansion — is central to Prologis's pitch to planners. "Prologis will fund the transmission interconnection work needed for this project upfront," the company told the Mercury News, adding that it would install a second, independently routed line "to enhance system reliability and reduce reliance on backup generation." The company also says it will enroll in San Jose's Total Clean Energy program.

That infrastructure commitment is real, but it's a company statement, not a filed regulatory document. No CPUC filings independently confirming the 99-megawatt interconnection arrangement for this specific site have surfaced publicly.

Community groups aren't waiting for the paperwork to fill in. Alviso in Action and Dreaming Collaborative — which collected more than 800 signatures — have raised concerns about the adequacy of public engagement and potential harm to nearby burrowing owl habitat, according to San Jose Spotlight. The Sierra Club's Loma Prieta Chapter has separately warned that city-drafted data center standards risk streamlining approvals without sufficient environmental protection.

Prologis is targeting a 2028 construction start and 2030 occupancy, per The Real Deal, contingent on approvals that aren't yet in hand. The company is also the preferred developer for a separate, larger 159-acre data center and advanced manufacturing campus at the San José–Santa Clara Regional Wastewater Facility — a distinct project still pending City Council action.

What to watch: whether San Jose requires a full Environmental Impact Report for the data center use (rather than relying on the 2022 warehouse MND), when any public comment period opens, and whether Prologis or PG&E file formal interconnection documentation with state regulators. Until that paper shows up, the 99-megawatt number is the developer's claim, not a confirmed allocation.