MIDPOINT
SubstationCalifornia · SOUTHERN CALIFORNIA EDISON
At a glance
MIDPOINT is an electric transmission substation in California, on SOUTHERN CALIFORNIA EDISON's transmission network. It is classified as distribution (<69 kv) and connects 1 transmission line. 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 |
|---|---|---|---|---|
| #313935 | 220 kV | SOUTHERN CALIFORNIA EDISON | IN SERVICE | 106.1 mi |
| #313933 | 33 kV | SOUTHERN CALIFORNIA EDISON | IN SERVICE | 16.8 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of MIDPOINT, 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 |
|---|---|---|---|---|---|---|---|
| COLORADO RIVER | Substation-Adjacent | CA | La Paz County | 500 kV | 1,000 MW | 7.6 yrs | 57.1 |
| BUCK | Substation-Adjacent | CA | La Paz County | 230 kV | 300 MW | 7.6 yrs | 53.3 |
| BLYTHE | Substation-Adjacent | CA | La Paz County | 161 kV | 100 MW | 7.6 yrs | 49.8 |
| BLM Solar DLA: Riverside East | Greenfield | AZ | La Paz County | — | 5,000 MW | 7.6 yrs | 49.0 |
| All-American Canal System | Federal Excess | AZ | La Paz County | — | — | 3.5 yrs | 44.7 |
| Colorado River Front Work & Levee System | Federal Excess | AZ | La Paz County | — | — | 3.5 yrs | 44.7 |
| All-American Canal System | Federal Excess | AZ | La Paz County | — | — | 3.5 yrs | 44.7 |
| All-American Canal System | Federal Excess | AZ | La Paz County | — | — | 3.5 yrs | 44.7 |
How does MIDPOINT 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. 1,439 named substations in the state are in MIDPOINT's below 69 kV band (48% of named stations). 1,504 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.
Who owns the transmission lines at MIDPOINT?
The 2 connected lines listed above are owned by SOUTHERN CALIFORNIA EDISON. Line voltages range from 33 kV to 220 kV. Their combined recorded length is about 123 miles.
How do candidate sites near MIDPOINT score?
The 8 highest-scoring candidate sites within about 25 miles range from 45 to 57 on the 0–100 DC Readiness scale. They fall in La Paz 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 MIDPOINT substation?
MIDPOINT has a maximum voltage of 33 kV. That places it in the below 69 kV band. The median named US substation in this dataset is 115 kV, so MIDPOINT is below the national midpoint.
How many transmission lines connect to MIDPOINT substation?
1 transmission line terminate at or pass through MIDPOINT in the HIFLD line data. The connected lines listed here run at 220 kV, 33 kV. Together the listed lines cover about 123 miles.
Who owns MIDPOINT substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at MIDPOINT belong to SOUTHERN CALIFORNIA EDISON. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is MIDPOINT substation located?
MIDPOINT is in California at 33.5649, -114.9066. The datacenter candidate sites closest to it are in La Paz County.
Are there datacenter candidate sites near MIDPOINT substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of MIDPOINT. The highest-scoring is COLORADO RIVER at 57/100. Across California, the average DC Readiness score is 45.4.
Other 33 kV substations in California
- DESERT OUTPOST· 4 lines
- ARRO· 2 lines
- BURNT MILL· 2 lines
- CANTIL· 2 lines
- DAGGETT· 2 lines
- NORTH MUROC· 2 lines
- PALM VILLAGE· 2 lines
- RUNNING SPRINGS· 2 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, “MIDPOINT substation, California”, https://gridcensus.com/substations/california/midpoint-78a01c08 (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 MIDPOINT 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.