Every power reactor at this site as listed in the IAEA Power Reactor Information System (PRIS): reactor type and model, net electrical capacity, grid connection and commercial operation dates, and current status.
Source: IAEA Power Reactor Information System (PRIS), as of 2026-10-19.
Working Here
Per Diem Rates
FY 2027
?
Per diem covers lodging and meals & incidental expenses (M&IE) for government and contractor travel near this facility. Rates are from GSA for FY 2027.
Maximum state unemployment insurance benefits for SD. Actual benefits depend on your earnings history and may be lower than the maximum. Data as of Jan 2026.
Interactive satellite map showing the facility's geographic location. Marker color indicates current status: green for online, red for offline, orange for reduced power. Click the header to open in Google Maps satellite view.
43.6036, -96.6375
Location & Contact
?
Physical address, phone number, and website for this facility. Use the directions link to get driving directions via Google Maps.
Written by NukeWorker from public records: facts that do not change. Operator, status and capacity come from the live data elsewhere on this page. Sources: Wikipedia: Pathfinder Nuclear Generating Station; NRC: Pathfinder licensing history.
The Pathfinder Atomic Power Plant was a nuclear power station near Sioux Falls, South Dakota, built by Northern States Power as a proof-of-concept plant, in cooperation with the U.S. Atomic Energy Commission. It used a boiling water reactor with an Allis-Chalmers nuclear superheater.
Read more
The reactor first went critical in 1964 and the plant entered commercial operation in 1966. It was shut down in 1967 after the failure of steam separators, and the superheater had been plagued with technical difficulties. In 1968 the owner decided to keep the reactor permanently shut down and installed three package boilers to convert the plant to fossil fuel. The reactor was defueled and placed in SAFSTOR in 1969 and 1970, and the reactor itself was removed in 1991.
Ownership & Construction
?
The utility or company that owns and operates the facility, the architect-engineer responsible for plant design, and the primary construction contractor. Click names to view all facilities by that entity on the map.
Reactor design specifications including type (PWR/BWR), containment design, nuclear steam supply system manufacturer, thermal and electrical power ratings, and current operational status.
NRC licensing history including docket number, license type and number, construction permit date, operating license issuance, commercial operation date, license renewal, and expiration date.
