UNITED COGEN TAP
Substation-AdjacentSan Mateo County, California · CAISO
At a glance
UNITED COGEN TAP is a substation-adjacent datacenter candidate site in San Mateo County, California, scoring 52.5/100 DC Readiness — 37th of 70 scored sites in the county. Its nearest substation is UNITED COGEN TAP (0 mi, 115 kV). It sits in the CAISO grid region and the PACIFIC GAS & ELECTRIC CO. service territory, where interconnection has averaged 7.6 years from request to operation. GridCensus catalogs 100 MW of candidate capacity here.
Power & interconnection
Speed to power
Deep queue and long historical waits — plan for a multi-year interconnection timeline and engage the utility early.
Connectivity
Site characteristics
Risk & environment
Location context
Regulatory climate
No notable statewide DC restriction on record; confirm local zoning and utility tariffs.
Site location
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How does UNITED COGEN TAP compare with other sites in San Mateo County?
UNITED COGEN TAP ranks 37th of 70 scored candidate sites in San Mateo County. Its 52.5/100 is roughly in line with the county average of 51.9. It is about 16% above the California average of 45.4 and roughly in line with the national average of 53.2.
Against the California average, its strongest sub-score is fiber connectivity (91 vs 66) and its weakest is natural hazard (37 vs 51). Power and speed to power each carry 20% of the composite score, fiber 12%, water 7% and hazard 6%.
How close is UNITED COGEN TAP to power, fiber and other datacenters?
The nearest mapped substation, UNITED COGEN TAP, is about 0 miles away and operates at 115 kV. The nearest located transmission bottleneck is 30750_MOSSLD _230_30797_LASAGUIL_230_BR_1 _1 (CAISO), 27 miles away. For connectivity, the nearest internet exchange facility is Digital Realty SFO (200 Paul) at 5.9 miles. 12 fiber providers report service at the location in FCC broadband data. The closest operating datacenter on record is Digital Realty San Francisco SFO10, 5.9 miles away.
What are the flood, water and hazard risks at UNITED COGEN TAP?
The site is in FEMA flood zone AE, a Special Flood Hazard Area — land with at least a 1% annual chance of flooding. At the county level, FEMA's National Risk Index rates San Mateo County "Relatively High".
Full DC Readiness breakdown
All 13 weighted sub-scores (0–100) behind the composite DC Readiness score.
Nearby comparable sites
Other scored datacenter candidate sites in San Mateo County, ranked by DC Readiness.
| Site | Type | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|
| Hunters Point | Brownfield | 115 kV | 427 MW | 7.6 yrs | 61.3 |
| MARTIN | Substation-Adjacent | 230 kV | 300 MW | 7.6 yrs | 59.0 |
| S.L.A.C. | Substation-Adjacent | 230 kV | 300 MW | 7.6 yrs | 58.8 |
| RAVENSWOOD | Substation-Adjacent | 230 kV | 300 MW | 7.6 yrs | 58.0 |
| MONTA VISTA (UPPER) | Substation-Adjacent | 230 kV | 300 MW | 7.6 yrs | 57.8 |
| JEFFERSON | Substation-Adjacent | 230 kV | 300 MW | 7.6 yrs | 57.6 |
| S.L.A.C. TAP | Substation-Adjacent | 230 kV | 300 MW | 7.6 yrs | 57.4 |
| SAN MATEO | Substation-Adjacent | 230 kV | 300 MW | 7.6 yrs | 57.3 |
UNITED COGEN TAP: common questions
What is the DC Readiness score of UNITED COGEN TAP?
UNITED COGEN TAP scores 52.5/100 on the GridCensus DC Readiness scale, rated fair. It ranks 37th of 70 scored sites in San Mateo County. The San Mateo County average is 51.9 and the California average is 45.4.
What is the nearest substation to UNITED COGEN TAP?
The nearest mapped substation is UNITED COGEN TAP, about 0 miles away, at 115 kV. GridCensus catalogs 100 MW of candidate capacity for the site.
Which electric utility serves UNITED COGEN TAP?
PACIFIC GAS & ELECTRIC CO. (investor owned) holds the retail service territory that contains the site; its holding company is PACIFIC GAS & ELECTRIC CORPORATION.
What grid region is UNITED COGEN TAP in?
UNITED COGEN TAP is in the CAISO region. Projects interconnecting there have averaged a 7.6-year wait from queue request to operation.
Is UNITED COGEN TAP in a flood zone?
The site is in FEMA flood zone AE, a Special Flood Hazard Area — land with at least a 1% annual chance of flooding.
How far is UNITED COGEN TAP from an internet exchange?
The nearest internet exchange facility is Digital Realty SFO (200 Paul), about 5.9 miles away; 12 fiber providers report service at the location.
Related pages
About this data
Source: GridCensus composite of HIFLD transmission and substation data, EIA, FEMA National Risk Index, FCC broadband data, PeeringDB and ISO interconnection queues, as published October 10, 2026 — GridCensus refreshes it monthly. See the methodology for how records are matched, cleaned and scored.
Cite as: GridCensus, “UNITED COGEN TAP, San Mateo County, CA”, https://gridcensus.com/datacenter-sites/california/san-mateo-county/united-cogen-tap-0103db21 (data as of October 10, 2026).
Dataset updated . Screening estimates derived from public data sources.
Figures are screening estimates derived from public infrastructure data. Catalogued capacity reflects theoretical candidate capacity, not deliverable or committed interconnection. Confirm all values with the utility, ISO, and on-the-ground due diligence.
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