Fort St. Vrain
Permanently Shut DownXcel Energy·Platteville, CO·HTGR·330 MWe
Reactor Data
Reactor Units
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.
1 unit: 1 permanent shutdown.
| Unit | Type | Model | Net MWe | Construction | Grid | Commercial Op | Shutdown | Status |
|---|---|---|---|---|---|---|---|---|
| Fort St. Vrain | HTGR | 330 | 1968-09-01 | 1976-12-11 | 1979-07-01 | 1989-08-29 | Permanent Shutdown |
Capacity, milestones and suppliers
| Unit | Design MWe | Gross MWe | Thermal MWt | First Criticality | Reactor Supplier | Turbine Supplier | Notes |
|---|---|---|---|---|---|---|---|
| Fort St. Vrain | 330 | 342 | 842 | 1974-01-31 | GENERAL ATOMIC CORP. |
Lifetime performance, through 2025
| Unit | Electricity Supplied | Load Factor | Energy Availability | Operating Factor |
|---|---|---|---|---|
| Fort St. Vrain | 5.4 TWh | 15.3% | 30.9% | 31.3% |
Operator: PUBLIC SERVICE CO. OF COLORADO
Source: IAEA Power Reactor Information System (PRIS), as of 2026-10-19.
Fuel Cycle Facilities
Fuel cycle plants at this site, as listed in the IAEA Nuclear Fuel Cycle Facilities Database: what each plant does, its scale and design capacity, the years it operated, its current status and who operates it.
1 facility: 1 in operation.
| Facility | Type | Scale | Design Capacity | Operated | Status | Operator |
|---|---|---|---|---|---|---|
| Fort St. Vrain NPP Site ISFSI | AFR Dry Spent Fuel Storage | Commercial | 15.4 t HM | 1992– | In Operation | Public Service Co. of Colorado |
Source: IAEA Nuclear Fuel Cycle Facilities Database (NFCFDB), as of 2026-10-13.
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.
$113
Lodging/Night
$68
M&IE/Day
$181
Total/Day
Standard Rate, CO
Unemployment Benefits CO
Maximum state unemployment insurance benefits for CO. Actual benefits depend on your earnings history and may be lower than the maximum. Data as of Jan 2026.
$844
Max Weekly
26
Max Weeks
$21,944
Max Total
7-day waiting period before benefits begin
Photos
Photos of this facility from the NukeWorker photo gallery. Click the header or any photo to browse the full album.
Facility Map
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.
40.2445, -104.875
Location & Contact
Physical address, phone number, and website for this facility. Use the directions link to get driving directions via Google Maps.
Phone:
(303) 620-1000
Website:
http://www.xcelenergy.com
Plant Facts
About This Site
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: Fort St. Vrain Generating Station.
Fort St. Vrain was a high-temperature gas-cooled reactor power plant near Platteville, in Weld County, Colorado. Public Service Company of Colorado proposed it in March 1965 and filed its application with the Atomic Energy Commission in October 1966.
Read more
Construction began in September 1968, and testing started in 1972. The reactor was first connected to the grid on December 11, 1976, and distributed first commercial power in July 1979. It was permanently shut down on August 29, 1989, after a critical reactor part needed an expensive replacement. Decommissioning and fuel removal were complete by 1992, and in 1996 the site was converted to a natural gas power plant.
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.
Owner/Operator:
Xcel Energy
XEL
Xcel Energy Inc.
NasdaqGS
$76.31
▲ +1.19 (+1.58%)
Previous Close
75.12
Day's Range
75.14 – 76.45
52-Week Range
68.72 – 84.23
Volume
6,279,134
Delayed quote as of Oct 16, 2026 4:00 PM ET.
Source: Yahoo Finance.
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Technical Specs
Reactor design specifications including type (PWR/BWR), containment design, nuclear steam supply system manufacturer, thermal and electrical power ratings, and current operational status.
Licensing
NRC licensing history including docket number, license type and number, construction permit date, operating license issuance, commercial operation date, license renewal, and expiration date.
Const. Permit:
1968-09-01
Operating Lic:
1976-12-11
Commercial Op:
1979-07-01