Former Mine site at 38.603, -122.856
Former MineSonoma County, California · CAISO
At a glance
Former Mine site at 38.603, -122.856 is a former mine datacenter candidate site in Sonoma County, California, scoring 43.1/100 DC Readiness — 80th of 83 scored sites in the county. It sits in the CAISO grid region and the CITY OF HEALDSBURG - (CA) service territory, where interconnection has averaged 7.6 years from request to operation.
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.
Site location
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How does Former Mine site at 38.603, -122.856 compare with other sites in Sonoma County?
Former Mine site at 38.603, -122.856 ranks 80th of 83 scored candidate sites in Sonoma County. Its 43.1/100 is roughly in line with the county average of 47.3. It is roughly in line with the California average of 45.4 and about 19% below the national average of 53.2.
Against the California average, its strongest sub-score is natural hazard (52 vs 51) and its weakest is power availability (30 vs 36). Power and speed to power each carry 20% of the composite score, fiber 12%, water 7% and hazard 6%.
How close is Former Mine site at 38.603, -122.856 to power, fiber and other datacenters?
The nearest located transmission bottleneck is 31336_HPLND JT_60.0_31370_CLVRDLJT_60.0_BR_1 _1 (CAISO), 22 miles away. For connectivity, the nearest internet exchange facility is X2nSat Petaluma at 24.9 miles. 8 fiber providers report service at the location in FCC broadband data. The closest operating datacenter on record is X2nSat Petaluma, 24.9 miles away.
What are the flood, water and hazard risks at Former Mine site at 38.603, -122.856?
The site is in FEMA flood zone X, outside the Special Flood Hazard Area (minimal or moderate flood risk). At the county level, FEMA's National Risk Index rates Sonoma County "Relatively High".
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 Sonoma County, ranked by DC Readiness.
| Site | Type | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|
| FULTON | Substation-Adjacent | 230 kV | 300 MW | 7.6 yrs | 54.3 |
| SOCRATES 19 | Substation-Adjacent | 230 kV | 300 MW | 7.6 yrs | 53.3 |
| OZ Sonoma | Greenfield | — | — | 7.6 yrs | 53.0 |
| WEST FORD FLAT | Substation-Adjacent | 230 kV | 300 MW | 7.6 yrs | 52.9 |
| BEAR CANYON | Substation-Adjacent | 230 kV | 300 MW | 7.6 yrs | 52.6 |
| QUICKSILVER | Substation-Adjacent | 230 kV | 300 MW | 7.6 yrs | 51.9 |
| BIG GEYSERS | Substation-Adjacent | 230 kV | 300 MW | 7.6 yrs | 51.9 |
| CALISTOGA 199 | Substation-Adjacent | 230 kV | 300 MW | 7.6 yrs | 51.9 |
Former Mine site at 38.603, -122.856: common questions
What is the DC Readiness score of Former Mine site at 38.603, -122.856?
Former Mine site at 38.603, -122.856 scores 43.1/100 on the GridCensus DC Readiness scale, rated fair. It ranks 80th of 83 scored sites in Sonoma County. The Sonoma County average is 47.3 and the California average is 45.4.
Which electric utility serves Former Mine site at 38.603, -122.856?
CITY OF HEALDSBURG - (CA) (not available) holds the retail service territory that contains the site; its holding company is CITY OF HEALDSBURG ELECTRIC DEPARTMENT.
What grid region is Former Mine site at 38.603, -122.856 in?
Former Mine site at 38.603, -122.856 is in the CAISO region. Projects interconnecting there have averaged a 7.6-year wait from queue request to operation.
Is Former Mine site at 38.603, -122.856 in a flood zone?
The site is in FEMA flood zone X, outside the Special Flood Hazard Area (minimal or moderate flood risk).
How far is Former Mine site at 38.603, -122.856 from an internet exchange?
The nearest internet exchange facility is X2nSat Petaluma, about 24.9 miles away; 8 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, “Former Mine site at 38.603, -122.856, Sonoma County, CA”, https://gridcensus.com/datacenter-sites/california/sonoma-county/mine-site-118abe7c (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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