HEISSON
Substation-AdjacentClark County, Washington · WECC
At a glance
HEISSON is a substation-adjacent datacenter candidate site in Clark County, Washington, scoring 56.6/100 DC Readiness — 41st of 84 scored sites in the county. Its nearest substation is HEISSON (0 mi, 115 kV). It sits in the WECC grid region and the PUD NO 1 OF CLARK COUNTY - (WA) service territory, where interconnection has averaged 3.5 years from request to operation. GridCensus catalogs 100 MW of candidate capacity here.
Power & interconnection
Speed to power
Deep queue and long historical waits — plan for a multi-year interconnection timeline and engage the utility early.
Connectivity
Site characteristics
Risk & environment
Location context
Regulatory climate
No notable statewide DC restriction on record; confirm local zoning and utility tariffs.
Incentive detail: Sales tax exemption on DC equipment and construction for eligible facilities; no state income tax.
Site location
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How does HEISSON compare with other sites in Clark County?
HEISSON ranks 41st of 84 scored candidate sites in Clark County. Its 56.6/100 is roughly in line with the county average of 55.7. It is roughly in line with the Washington average of 51.7 and roughly in line with the national average of 53.2.
Against the Washington average, its strongest sub-score is power availability (56 vs 37) and its weakest is speed to power (50 vs 50). Power and speed to power each carry 20% of the composite score, fiber 12%, water 7% and hazard 6%.
How close is HEISSON to power, fiber and other datacenters?
The nearest mapped substation, HEISSON, is about 0 miles away and operates at 115 kV. For connectivity, the nearest internet exchange facility is GRHMORXB - Gresham Central Office at 21.9 miles. 9 fiber providers report service at the location in FCC broadband data. The closest operating datacenter on record is GRHMORXB - Gresham Central Office, 21.9 miles away.
What are the flood, water and hazard risks at HEISSON?
At the county level, FEMA's National Risk Index rates Clark County "Relatively Moderate".
Full DC Readiness breakdown
All 13 weighted sub-scores (0–100) behind the composite DC Readiness score.
Nearby comparable sites
Other scored datacenter candidate sites in Clark County, ranked by DC Readiness.
| Site | Type | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|
| ROSS | Substation-Adjacent | 345 kV | 600 MW | 3.5 yrs | 64.9 |
| ALCOA | Substation-Adjacent | 230 kV | 300 MW | 3.5 yrs | 63.1 |
| SIFTON | Substation-Adjacent | 230 kV | 300 MW | 3.5 yrs | 62.6 |
| WOODLAND | Substation-Adjacent | 230 kV | 300 MW | 3.5 yrs | 59.9 |
| CARBORUNDUM | Substation-Adjacent | 115 kV | 100 MW | 3.5 yrs | 58.9 |
| UNKNOWN203215 | Substation-Adjacent | 115 kV | 100 MW | 3.5 yrs | 58.9 |
| TAP203212 | Substation-Adjacent | 115 kV | 100 MW | 3.5 yrs | 58.8 |
| UNKNOWN202091 | Substation-Adjacent | 115 kV | 100 MW | 3.5 yrs | 58.8 |
HEISSON: common questions
What is the DC Readiness score of HEISSON?
HEISSON scores 56.6/100 on the GridCensus DC Readiness scale, rated good. It ranks 41st of 84 scored sites in Clark County. The Clark County average is 55.7 and the Washington average is 51.7.
What is the nearest substation to HEISSON?
The nearest mapped substation is HEISSON, about 0 miles away, at 115 kV. GridCensus catalogs 100 MW of candidate capacity for the site.
Which electric utility serves HEISSON?
PUD NO 1 OF CLARK COUNTY - (WA) (political subdivision) holds the retail service territory that contains the site; its holding company is PUD NO 1 OF CLARK COUNTY.
What grid region is HEISSON in?
HEISSON is in the WECC region. Projects interconnecting there have averaged a 3.5-year wait from queue request to operation.
How far is HEISSON from an internet exchange?
The nearest internet exchange facility is GRHMORXB - Gresham Central Office, about 21.9 miles away; 9 fiber providers report service at the location.
Related pages
About this data
Source: GridCensus composite of HIFLD transmission and substation data, EIA, FEMA National Risk Index, FCC broadband data, PeeringDB and ISO interconnection queues, as published October 10, 2026 — GridCensus refreshes it monthly. See the methodology for how records are matched, cleaned and scored.
Cite as: GridCensus, “HEISSON, Clark County, WA”, https://gridcensus.com/datacenter-sites/washington/clark-county/heisson-3e861d52 (data as of October 10, 2026).
Dataset updated . Screening estimates derived from public data sources.
Figures are screening estimates derived from public infrastructure data. Catalogued capacity reflects theoretical candidate capacity, not deliverable or committed interconnection. Confirm all values with the utility, ISO, and on-the-ground due diligence.
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