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Datacenter Sites in Custer County, Idaho

Custer County has 19 scored datacenter candidate sites averaging 47.8/100 DC Readiness, with a catalogued aggregate of 1,000 MW. FEMA rates local natural-hazard risk as "Relatively Low". The county has a datacenter tax incentive on record.

At a glance

Custer County, Idaho has 19 scored datacenter candidate sites averaging 47.8/100 DC Readiness, roughly in line with the Idaho average of 51.7. It ranks 33rd of 43 Idaho counties by number of sites and 41st by average score. The top-scoring site is Substation-Adjacent site · 5805f8ac at 56.2/100.

19
Candidate sites
47.8/100
Avg DC Readiness
1,000 MW
Catalogued capacity
theoretical aggregate
Relatively Low
Hazard rating
◆ Loading map…
≥ 7560–7540–60≤ 40
Top 19 in Custer County

Site-selection context for Custer County

Yesproperty_tax_exemption
Datacenter tax incentive
8.29¢/kWh
Commercial electricity
6.70¢/kWh
Industrial electricity
3
Fiber providers
Medium-High
Water stress
$3,588
Land price / acre
500
Cooling degree days
6,400
Heating degree days
44°F
Mean annual temp

Incentive detail: Personal property tax exemption on computer equipment.

How does Custer County compare with other counties in Idaho?

By number of scored sites, Custer County ranks 33rd of the 43 Idaho counties with a county page, holding 0.9% of the state's 2,171 sites. Its average DC Readiness of 47.8/100 ranks 41st in the state and is roughly in line with the national average of 53.0. Nationally it has the 1783rd-largest site inventory of 2,964 counties with five or more sites. 0 sites score 70 or higher and 3 score 55 or higher.

What types of datacenter sites are in Custer County?

Former Mine sites are the most common (6, 32% of the county's inventory), followed by industrial (6) and substation-adjacent (5). Site type reflects how the parcel was identified — next to a substation, on a former mine or brownfield, on industrial or federal excess land — and is scored on the same 14 factors either way.

What are power cost, hazard, water and fiber conditions in Custer County?

Industrial electricity averages 6.70¢/kWh and commercial 8.29¢/kWh. FEMA's National Risk Index rates the county "Relatively Low" (15). WRI water stress is medium-high. 3 fiber providers report service in the county. The climate runs 500 cooling degree days a year with a mean temperature of 44°F. Land is valued around $3,588 an acre.

By site type

Top datacenter sites in Custer County

Top datacenter sites in Custer County
SiteTypeVoltageCapacityQueue waitScore
UNKNOWN201563Substation-Adjacent230 kV300 MW5.0 yrs56.2
ROUND VALLEYSubstation-Adjacent230 kV300 MW5.0 yrs56.2
SPAR CANYONSubstation-Adjacent230 kV300 MW5.0 yrs56.2
DEAD HEADSubstation-Adjacent69 kV50 MW5.0 yrs49.9
TAP204813Substation-Adjacent69 kV50 MW5.0 yrs49.9
Mine SiteFormer Mine——5.0 yrs47.5
GuffyIndustrial——5.0 yrs46.9
CHALLIS NATIONAL FORESTFederal Excess——5.0 yrs46.6
Mine SiteFormer Mine——5.0 yrs46.3
SAWTOOTH NATIONAL FISH HATCHERYFederal Excess——5.0 yrs46.3
Mine SiteFormer Mine——5.0 yrs46.1
Mine SiteFormer Mine——5.0 yrs45.3
Mine SiteFormer Mine——5.0 yrs45.3
Bayhorse Mining District - Skylark-RamshornIndustrial——5.0 yrs44.8
Mine SiteFormer Mine——5.0 yrs44.8
Bayhorse Mining District - Town Site and MineIndustrial——5.0 yrs44.8
Bayhorse Mining District - Pacific MineIndustrial——5.0 yrs44.8
Bayhorse Mining District - Beardsley MineIndustrial——5.0 yrs44.8
Bayhorse Mining District - South ParcelIndustrial——5.0 yrs44.8

Every scored site in Custer County

All 19 sites, best first.

Custer County datacenter FAQ

How many datacenter sites are in Custer County?

19 scored datacenter candidate sites, averaging 47.8/100 DC Readiness. That is the 33rd-most of 43 Idaho counties with five or more sites.

What is the highest-scoring datacenter site in Custer County?

Substation-Adjacent site · 5805f8ac scores 56.2/100 DC Readiness, the highest of the 19 scored sites in Custer County (a substation-adjacent site).

Does Custer County offer datacenter tax incentives?

Personal property tax exemption on computer equipment.

What is the natural-hazard risk in Custer County?

FEMA's National Risk Index rates Custer County as "Relatively Low" (score 15).

What are industrial electricity rates in Custer County?

Average industrial electricity is 6.70¢/kWh and commercial is 8.29¢/kWh in Custer County.

More in Idaho

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 November 12, 2026 — GridCensus refreshes it monthly. See the methodology for how records are matched, cleaned and scored.

Cite as: GridCensus, “Datacenter candidate sites in Custer County, Idaho”, https://gridcensus.com/datacenter-sites/idaho/custer-county (data as of November 12, 2026).

Dataset updated . Screening estimates derived from public data sources.

Go deeper than the public screen

Every site and score for Custer County, Idaho 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.

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