Data Center Site Selection in the Pacific Northwest

For this guide, the Pacific Northwest means Washington, Oregon, Idaho and western Montana. The region is not in an ISO or RTO. Utilities operate as or within balancing authorities, and many participate in real-time energy markets that operate across the West. Some utilities also participate in regional resource adequacy efforts. Market participation changes over time, so check the current arrangement for the utility that would serve a site.

A federal power marketing administration sells power from the federal dams on the Columbia River system and owns a large share of the region’s high-voltage transmission. Public utility districts, municipal utilities and cooperatives buy much of that federal power and serve many rural and small-city areas, alongside investor-owned utilities that serve major metros and other territories.

The region’s reputation for low-cost power comes from federal hydropower, which is marketed first to public utilities under long-standing federal law. That same framework generally keeps large new single loads from being served at the lowest-cost federal rate. In practice, a utility serving a new data center often has to buy or build additional supply for it, and the rate reflects those new resource costs rather than the legacy hydro system.

Hydro output also varies with snowpack and streamflow. In dry years, utilities buy more power from the market or other resources. That does not rule out a site, but it means the utility’s plan for serving the load matters more than the regional average price.

• Ask how the utility would supply the load and at what rate structure.
• Ask whether the utility’s wholesale contracts allow it to grow by the amount you need.
• Expect contract terms that protect existing customers, such as minimum bills and collateral.

Interconnection is led by the retail utility, which may need transmission service from the federal system or another transmission owner to bring supply to the site. That can mean two sets of studies and agreements. High-voltage service in the region is commonly at 115, 230, 345 or 500 kV.

Transmission paths across the Cascades, between east and west, and to and from neighboring regions can be constrained, and new major lines take years. A site near a large hydro project is not automatically able to take power from it. Our guide to transmission upgrades and cost allocation covers who pays when upgrades are needed.

East of the Cascades, the climate is dry, with cold winters and hot summers but low humidity. That supports a large number of hours where outside air or evaporative cooling can carry the load. West of the Cascades, the climate is mild and maritime. Both favor economization compared with the humid Southeast. See climate and cooling in site selection.

Wildfire smoke is a growing design consideration across the region. Heavy smoke can limit the use of outside air for days at a time, so designs that depend on economization still need full mechanical capacity and good filtration.

• The Cascadia subduction zone off the coast can produce very large earthquakes; crustal faults add risk inland.
• Volcanic hazards include lahars, mudflows that follow river valleys downstream of the Cascade volcanoes, and ashfall.
• Wildfire risk is significant east of the Cascades and in many forested areas.
• River flooding, and landslides on steep, wet slopes west of the Cascades.

Seismic design is required in the building code, but site location still matters for cost, liquefaction risk and how much of the region’s infrastructure might be disrupted after a major earthquake.

Washington, Oregon and Idaho use prior appropriation for water rights: older rights have priority, and some basins are closed or restricted to new appropriations. A new data center may need to use municipal supply, buy and transfer an existing right, or choose a low-water cooling design. Instream flow requirements for fish, protected species and tribal treaty rights can all affect what water is available.

Oregon and Washington both have statewide growth management frameworks that limit development outside designated urban or industrial areas, and farmland protection is strong in parts of both states. That makes zoning and land-use designation an early screen; a large rural tract may not be developable without a long process. Idaho and Montana generally leave more to local governments.

Fiber concentrates in the Seattle and Portland metros, with subsea cable landings on the coast and long-haul routes along the main east-west and north-south interstate corridors. Rural sites east of the Cascades need diverse paths to those routes.

1. 01Confirm the retail utility, its balancing authority and its wholesale supply arrangements.
2. 02Ask how the load would be supplied and priced under the utility’s large-load terms.
3. 03Confirm transmission service to the delivery point, including any federal transmission.
4. 04Check the water basin status and the path to a usable water right.
5. 05Screen seismic, lahar, wildfire and flood exposure.
6. 06Confirm that state and local land-use rules allow the use on the parcel.