EAST PORTAL
SubstationCalifornia
At a glance
EAST PORTAL is an electric transmission substation in California. It is classified as sub-transmission (115 kv) and connects 2 transmission lines. Substation proximity is one of the strongest speed-to-power signals for siting a datacenter — interconnection distance to an energized, high-voltage bus is often the binding constraint on time-to-energization.
Voltage & classification
Ownership & operation
Operator not catalogued for this substation.
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of EAST PORTAL, ranked by DC Readiness. Sites this close to an energized substation carry a strong speed-to-power advantage.
| Site | Type | State | County | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|---|---|
| Hunters Point | Brownfield | CA | San Mateo County | 115 kV | 427 MW | 7.6 yrs | 61.3 |
| EMBARCADERO | Substation-Adjacent | CA | Contra Costa County | 230 kV | 300 MW | 7.6 yrs | 59.8 |
| NEWARK DISTRIBUTION | Substation-Adjacent | CA | Alameda County | 230 kV | 300 MW | 7.6 yrs | 59.3 |
| MARTIN | Substation-Adjacent | CA | San Mateo County | 230 kV | 300 MW | 7.6 yrs | 59.0 |
| EASTSHORE | Substation-Adjacent | CA | Alameda County | 230 kV | 300 MW | 7.6 yrs | 58.7 |
| FREMONT | Substation-Adjacent | CA | Alameda County | 230 kV | 300 MW | 7.6 yrs | 58.4 |
| RAVENSWOOD | Substation-Adjacent | CA | San Mateo County | 230 kV | 300 MW | 7.6 yrs | 58.0 |
| STATION G | Substation-Adjacent | CA | Marin County | 230 kV | 300 MW | 7.6 yrs | 57.9 |
How does EAST PORTAL compare with other substations in California?
California has 4,260 substation records in HIFLD, of which 3,003 carry a station name; the rest are unnamed tap points, risers and line ends. 697 named substations in the state are in EAST PORTAL's 115–229 kV band (23% of named stations). 428 sit in a higher band. 44 named substations in California operate at 345 kV or above. The highest voltage recorded in the state is 500 kV, and the state median is 69 kV.
How do candidate sites near EAST PORTAL score?
The 8 highest-scoring candidate sites within about 25 miles range from 58 to 61 on the 0–100 DC Readiness scale. They fall in San Mateo County, Contra Costa County, Alameda County, Marin County. The California average across 8,490 scored sites is 45.4. 1,573 of those California sites are classed as substation sites (candidate locations generated at an existing substation).
Frequently asked questions
What voltage is EAST PORTAL substation?
EAST PORTAL has a maximum voltage of 115 kV. That places it in the 115–229 kV band. The median named US substation in this dataset is 115 kV, so EAST PORTAL is at the national midpoint.
How many transmission lines connect to EAST PORTAL substation?
2 transmission lines terminate at or pass through EAST PORTAL in the HIFLD line data.
Where is EAST PORTAL substation located?
EAST PORTAL is in California at 37.8760, -122.1870. The datacenter candidate sites closest to it are in San Mateo County, Contra Costa County, Alameda County.
Are there datacenter candidate sites near EAST PORTAL substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of EAST PORTAL. The highest-scoring is Hunters Point at 61/100. Across California, the average DC Readiness score is 45.4.
Other 115 kV substations in California
- SANGER· 11 lines
- COLTON (CENTURY)· 10 lines
- MANTECA· 10 lines
- EAST NICOLAUS· 9 lines
- HERNDON· 9 lines
- AMES· 8 lines
- BAYSHORE· 8 lines
- CALECTRIC· 8 lines
- All named substations in California· 3,003 stations
- Datacenter candidate sites in California· 8,490 sites
- Brownfield and retired plant sites in California
- Substations by state
About this data
Source: HIFLD Electric Substations and Transmission Lines (U.S. Department of Homeland Security), as published June 29, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: GridCensus, “EAST PORTAL substation, California”, https://gridcensus.com/substations/california/east-portal-b4d85175 (data as of June 29, 2026).
Dataset updated . Screening estimates derived from public data sources.
Substation attributes are derived from public HIFLD / EIA infrastructure data and may lag real-world upgrades or retirements. Voltage and connected-line counts are screening figures — confirm available capacity and interconnection terms directly with the operating utility and ISO.
Go deeper than the public screen
Every site and score for EAST PORTAL substation, California is free to browse. Pro adds Watchtower on 25 sites, alerts when new candidate sites, datacenters or interconnection-queue requests appear in your markets, score and capacity history, and CSV export. Enterprise adds team seats, weekly data files for all 147,272 sites, the REST API and an MCP server for AI tools.