ROCK ISLAND DAM
Substation-AdjacentGrant County, Washington · WECC
At a glance
ROCK ISLAND DAM is a substation-adjacent datacenter candidate site in Grant County, Washington, scoring 60.1/100 DC Readiness — 52nd of 1,518 scored sites in the county. Its nearest substation is ROCK ISLAND DAM (0 mi, 115 kV). It sits in the WECC grid region and the PUD NO 1 OF DOUGLAS COUNTY 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 ROCK ISLAND DAM compare with other sites in Grant County?
ROCK ISLAND DAM ranks 52nd of 1,518 scored candidate sites in Grant County. Its 60.1/100 is about 14% above the county average of 52.7. It is about 16% above the Washington average of 51.7 and about 13% above the national average of 53.2.
Against the Washington average, its strongest sub-score is fiber connectivity (88 vs 63) 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 ROCK ISLAND DAM to power, fiber and other datacenters?
The nearest mapped substation, ROCK ISLAND DAM, is about 0 miles away and operates at 115 kV. For connectivity, the nearest internet exchange facility is H5 Data Centers Quincy 2/3 at 14.2 miles. 11 fiber providers report service at the location in FCC broadband data. The closest operating datacenter on record is EAT12, 3.3 miles away.
What are the flood, water and hazard risks at ROCK ISLAND DAM?
At the county level, FEMA's National Risk Index rates Grant 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 Grant County, ranked by DC Readiness.
| Site | Type | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|
| COLUMBIA | Substation-Adjacent | 500 kV | 1,000 MW | 3.5 yrs | 69.1 |
| Wanapum | Brownfield | 500 kV | 1,038 MW | 3.5 yrs | 68.2 |
| UNKNOWN206104 | Substation-Adjacent | 230 kV | 300 MW | 3.5 yrs | 66.6 |
| UNKNOWN209155 | Substation-Adjacent | 230 kV | 300 MW | 3.5 yrs | 66.5 |
| LARSON | Substation-Adjacent | 230 kV | 300 MW | 3.5 yrs | 66.3 |
| TAP206102 | Substation-Adjacent | 230 kV | 300 MW | 3.5 yrs | 66.3 |
| TAP206103 | Substation-Adjacent | 230 kV | 300 MW | 3.5 yrs | 66.2 |
| VANTAGE | Substation-Adjacent | 500 kV | 1,000 MW | 3.5 yrs | 65.6 |
ROCK ISLAND DAM: common questions
What is the DC Readiness score of ROCK ISLAND DAM?
ROCK ISLAND DAM scores 60.1/100 on the GridCensus DC Readiness scale, rated good. It ranks 52nd of 1,518 scored sites in Grant County. The Grant County average is 52.7 and the Washington average is 51.7.
What is the nearest substation to ROCK ISLAND DAM?
The nearest mapped substation is ROCK ISLAND DAM, about 0 miles away, at 115 kV. GridCensus catalogs 100 MW of candidate capacity for the site.
Which electric utility serves ROCK ISLAND DAM?
PUD NO 1 OF DOUGLAS COUNTY (political subdivision) holds the retail service territory that contains the site.
What grid region is ROCK ISLAND DAM in?
ROCK ISLAND DAM is in the WECC region. Projects interconnecting there have averaged a 3.5-year wait from queue request to operation.
How far is ROCK ISLAND DAM from an internet exchange?
The nearest internet exchange facility is H5 Data Centers Quincy 2/3, about 14.2 miles away; 11 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, “ROCK ISLAND DAM, Grant County, WA”, https://gridcensus.com/datacenter-sites/washington/grant-county/rock-island-dam-f70af0d5 (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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