DUMBARTON
Substation-AdjacentAlameda, California · CAISO
At a glance
DUMBARTON is a substation-adjacent datacenter candidate site in Alameda, California, scoring 53.2/100 DC Readiness — 53rd of 313 scored sites in the county. Its nearest substation is DUMBARTON (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 DUMBARTON compare with other sites in Alameda?
DUMBARTON ranks 53rd of 313 scored candidate sites in Alameda. Its 53.2/100 is roughly in line with the county average of 49.4. It is about 17% 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 (90 vs 66) and its weakest is water (24 vs 27). Power and speed to power each carry 20% of the composite score, fiber 12%, water 7% and hazard 6%.
How close is DUMBARTON to power, fiber and other datacenters?
The nearest mapped substation, DUMBARTON, is about 0 miles away and operates at 115 kV. The nearest located transmission bottleneck is 35658_LS ESTRS_115_35659_NORTECH _115_BR_1 _1 (CAISO), 11 miles away. For connectivity, the nearest internet exchange facility is T5@SiliconValley at 4.5 miles. 12 fiber providers report service at the location in FCC broadband data. The closest operating datacenter on record is Equinix Fremont, 3.8 miles away.
What are the flood, water and hazard risks at DUMBARTON?
At the county level, FEMA's National Risk Index rates Alameda "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 Alameda, ranked by DC Readiness.
| Site | Type | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|
| TESLA Power Project | Brownfield | 500 kV | 1,322 MW | 7.6 yrs | 66.5 |
| NEWARK DISTRIBUTION | Substation-Adjacent | 230 kV | 300 MW | 7.6 yrs | 59.3 |
| TESLA | Substation-Adjacent | 500 kV | 1,000 MW | 7.6 yrs | 59.2 |
| EASTSHORE | Substation-Adjacent | 230 kV | 300 MW | 7.6 yrs | 58.7 |
| LOS ESTEROS | Substation-Adjacent | 230 kV | 300 MW | 7.6 yrs | 58.6 |
| FREMONT | Substation-Adjacent | 230 kV | 300 MW | 7.6 yrs | 58.4 |
| Juniper Networks Sunnyvale | Brownfield | 115 kV | 1 MW | 7.6 yrs | 58.1 |
| CASTRO VALLEY | Substation-Adjacent | 230 kV | 300 MW | 7.6 yrs | 57.5 |
DUMBARTON: common questions
What is the DC Readiness score of DUMBARTON?
DUMBARTON scores 53.2/100 on the GridCensus DC Readiness scale, rated fair. It ranks 53rd of 313 scored sites in Alameda. The Alameda average is 49.4 and the California average is 45.4.
What is the nearest substation to DUMBARTON?
The nearest mapped substation is DUMBARTON, about 0 miles away, at 115 kV. GridCensus catalogs 100 MW of candidate capacity for the site.
Which electric utility serves DUMBARTON?
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 DUMBARTON in?
DUMBARTON is in the CAISO region. Projects interconnecting there have averaged a 7.6-year wait from queue request to operation.
How far is DUMBARTON from an internet exchange?
The nearest internet exchange facility is T5@SiliconValley, about 4.5 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, “DUMBARTON, Alameda, CA”, https://gridcensus.com/datacenter-sites/california/alameda/dumbarton-24ea3e0e (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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