TAP310821
SubstationCalifornia · SACRAMENTO MUNICIPAL UTILITY DISTRICT
At a glance
TAP310821 is an electric transmission substation in California, on SACRAMENTO MUNICIPAL UTILITY DISTRICT's transmission network. It is classified as distribution (<69 kv) and connects 3 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
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #309925 | 60 kV | SACRAMENTO MUNICIPAL UTILITY DISTRICT | IN SERVICE | 1.3 mi |
| #309976 | 60 kV | SACRAMENTO MUNICIPAL UTILITY DISTRICT | IN SERVICE | 0.4 mi |
| #311399 | 60 kV | SACRAMENTO MUNICIPAL UTILITY DISTRICT | IN SERVICE | 1.2 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of TAP310821, 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 |
|---|---|---|---|---|---|---|---|
| O'BANION | Substation-Adjacent | CA | Sutter County | 500 kV | 1,000 MW | 7.6 yrs | 58.6 |
| UNKNOWN302253 | Substation-Adjacent | CA | Sacramento County | 230 kV | 300 MW | 7.6 yrs | 58.0 |
| NORTH CITY | Substation-Adjacent | CA | Sacramento County | 230 kV | 300 MW | 7.6 yrs | 57.8 |
| STATION A | Substation-Adjacent | CA | Sacramento County | 230 kV | 300 MW | 7.6 yrs | 57.8 |
| STATION B | Substation-Adjacent | CA | Sacramento County | 230 kV | 300 MW | 7.6 yrs | 57.7 |
| STATION D | Substation-Adjacent | CA | Sacramento County | 230 kV | 300 MW | 7.6 yrs | 57.7 |
| FIDDYMENT | Substation-Adjacent | CA | Sacramento County | 230 kV | 300 MW | 7.6 yrs | 57.6 |
| NATOMAS | Substation-Adjacent | CA | Sacramento County | 230 kV | 300 MW | 7.6 yrs | 57.2 |
Who owns the transmission lines at TAP310821?
The 3 connected lines listed above are owned by SACRAMENTO MUNICIPAL UTILITY DISTRICT. Line voltages range from 60 kV to 60 kV. Their combined recorded length is about 2.9 miles.
How do candidate sites near TAP310821 score?
The 8 highest-scoring candidate sites within about 25 miles range from 57 to 59 on the 0–100 DC Readiness scale. They fall in Sutter County, Sacramento 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 TAP310821 substation?
TAP310821 has a maximum voltage of 60 kV. That places it in the below 69 kV band. The median named US substation in this dataset is 115 kV, so TAP310821 is below the national midpoint.
How many transmission lines connect to TAP310821 substation?
3 transmission lines terminate at or pass through TAP310821 in the HIFLD line data. The connected lines listed here run at 60 kV. Together the listed lines cover about 2.9 miles.
Who owns TAP310821 substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at TAP310821 belong to SACRAMENTO MUNICIPAL UTILITY DISTRICT. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is TAP310821 substation located?
TAP310821 is in California at 38.6275, -121.4754. The datacenter candidate sites closest to it are in Sutter County, Sacramento County.
Are there datacenter candidate sites near TAP310821 substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of TAP310821. The highest-scoring is O'BANION at 59/100. Across California, the average DC Readiness score is 45.4.
More in California
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, “TAP310821 substation, California”, https://gridcensus.com/substations/california/tap310821-3b483906 (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 TAP310821 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.