BIG HANAFORD
SubstationWashington · BONNEVILLE POWER ADMINISTRATION
At a glance
BIG HANAFORD is an electric transmission substation in Washington, on BONNEVILLE POWER ADMINISTRATION's transmission network. It is classified as unclassified and connects 0 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 |
|---|---|---|---|---|
| #206894 | 500 kV | BONNEVILLE POWER ADMINISTRATION | — | 0.5 mi |
| #206109 | 345 kV | PUGET SOUND ENERGY INC | — | 0.1 mi |
| #206108 | 230 kV | BONNEVILLE POWER ADMINISTRATION | — | 2.5 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of BIG HANAFORD, 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 |
|---|---|---|---|---|---|---|---|
| UNKNOWN201455 | Substation-Adjacent | WA | Thurston County | 500 kV | 1,000 MW | 3.5 yrs | 67.8 |
| OLYMPIA | Substation-Adjacent | WA | Thurston County | 500 kV | 1,000 MW | 3.5 yrs | 63.9 |
| NAPAVINE | Substation-Adjacent | WA | Thurston County | 500 kV | 1,000 MW | 3.5 yrs | 63.8 |
| OZ Pierce | Greenfield | WA | Pierce | — | — | 3.5 yrs | 62.3 |
| YELM PP | Substation-Adjacent | WA | Thurston County | 230 kV | 300 MW | 3.5 yrs | 61.8 |
| OZ Thurston | Greenfield | WA | Thurston | — | — | 3.5 yrs | 60.8 |
| OZ Thurston | Greenfield | WA | Thurston | — | — | 3.5 yrs | 60.7 |
| EC Near Transalta Centralia Generation | Greenfield | WA | Lewis | — | — | 3.5 yrs | 59.9 |
Who owns the transmission lines at BIG HANAFORD?
The 3 connected lines listed above are owned by BONNEVILLE POWER ADMINISTRATION, PUGET SOUND ENERGY INC. Line voltages range from 230 kV to 500 kV. Their combined recorded length is about 3.1 miles.
How do candidate sites near BIG HANAFORD score?
The 8 highest-scoring candidate sites within about 25 miles range from 60 to 68 on the 0–100 DC Readiness scale. They fall in Thurston County, Pierce, Thurston, Lewis. The Washington average across 6,019 scored sites is 51.7. 1,343 of those Washington sites are classed as substation sites (candidate locations generated at an existing substation).
Frequently asked questions
How many transmission lines connect to BIG HANAFORD substation?
0 transmission lines terminate at or pass through BIG HANAFORD in the HIFLD line data. The connected lines listed here run at 500 kV, 345 kV, 230 kV. Together the listed lines cover about 3.1 miles.
Who owns BIG HANAFORD substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at BIG HANAFORD belong to BONNEVILLE POWER ADMINISTRATION, and others to PUGET SOUND ENERGY INC. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is BIG HANAFORD substation located?
BIG HANAFORD is in Washington at 46.7541, -122.8646. The datacenter candidate sites closest to it are in Thurston County, Pierce, Thurston.
Are there datacenter candidate sites near BIG HANAFORD substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of BIG HANAFORD. The highest-scoring is UNKNOWN201455 at 68/100. Across Washington, the average DC Readiness score is 51.7.
More in Washington
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, “BIG HANAFORD substation, Washington”, https://gridcensus.com/substations/washington/big-hanaford-14382df4 (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 BIG HANAFORD substation, Washington 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.