CURLEW
SubstationUtah · PACIFICORP
At a glance
CURLEW is an electric transmission substation in Utah, on PACIFICORP's transmission network. It is classified as sub-transmission (138 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
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #209465 | 138 kV | PACIFICORP | — | 11.2 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of CURLEW, 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 |
|---|---|---|---|---|---|---|---|
| UNKNOWN209700 | Substation-Adjacent | ID | Oneida County | 69 kV | 50 MW | 5.0 yrs | 53.6 |
| TAP209701 | Substation-Adjacent | ID | Oneida County | 69 kV | 50 MW | 5.0 yrs | 53.4 |
| CURLEW | Substation-Adjacent | UT | Box Elder County | 138 kV | 100 MW | 3.5 yrs | 53.4 |
| UNKNOWN209702 | Substation-Adjacent | UT | Oneida County | 69 kV | 50 MW | 3.5 yrs | 53.2 |
| UNKNOWN209703 | Substation-Adjacent | ID | Oneida County | 69 kV | 50 MW | 5.0 yrs | 53.2 |
| UNKNOWN206143 | Substation-Adjacent | UT | Box Elder County | 138 kV | 100 MW | 3.5 yrs | 52.5 |
| UNKNOWN206144 | Substation-Adjacent | UT | Box Elder County | 115 kV | 100 MW | 3.5 yrs | 51.9 |
| PROMONTORY | Federal Excess | UT | Box Elder County | — | — | 3.5 yrs | 46.0 |
How does CURLEW compare with other substations in Utah?
Utah has 1,404 substation records in HIFLD, of which 243 carry a station name; the rest are unnamed tap points, risers and line ends. 112 named substations in the state are in CURLEW's 115–229 kV band (46% of named stations). 38 sit in a higher band. 22 named substations in Utah operate at 345 kV or above. The highest voltage recorded in the state is 500 kV, and the state median is 138 kV.
Who owns the transmission lines at CURLEW?
The 1 connected line listed above is owned by PACIFICORP. Line voltages range from 138 kV to 138 kV. Their combined recorded length is about 11.2 miles.
How do candidate sites near CURLEW score?
The 8 highest-scoring candidate sites within about 25 miles range from 46 to 54 on the 0–100 DC Readiness scale. They fall in Oneida County, Box Elder County. The Utah average across 2,458 scored sites is 51.7. 739 of those Utah sites are classed as substation sites (candidate locations generated at an existing substation).
Frequently asked questions
What voltage is CURLEW substation?
CURLEW has a maximum voltage of 138 kV. That places it in the 115–229 kV band. The median named US substation in this dataset is 115 kV, so CURLEW is above the national midpoint.
How many transmission lines connect to CURLEW substation?
1 transmission line terminate at or pass through CURLEW in the HIFLD line data. The connected lines listed here run at 138 kV. Together the listed lines cover about 11.2 miles.
Who owns CURLEW substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at CURLEW belong to PACIFICORP. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is CURLEW substation located?
CURLEW is in Utah at 41.9660, -112.9443. The datacenter candidate sites closest to it are in Oneida County, Box Elder County.
Are there datacenter candidate sites near CURLEW substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of CURLEW. The highest-scoring is UNKNOWN209700 at 54/100. Across Utah, the average DC Readiness score is 51.7.
Other 138 kV substations in Utah
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, “CURLEW substation, Utah”, https://gridcensus.com/substations/utah/curlew-e9496469 (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 CURLEW substation, Utah 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.