Zion 1
SAFSTORConstellation Energy·Zion, IL·PWR·1,040 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 |
|---|---|---|---|---|---|---|---|---|
| Zion 1 | PWR | WH 4LP | 1,040 | 1968-12-01 | 1973-06-28 | 1973-12-31 | 1998-02-13 | Permanent Shutdown |
Capacity, milestones and suppliers
| Unit | Design MWe | Gross MWe | Thermal MWt | First Criticality | Reactor Supplier | Turbine Supplier | Notes |
|---|---|---|---|---|---|---|---|
| Zion 1 | 1,040 | 1,085 | 3,250 | 1973-06-19 | WESTINGHOUSE ELECTRIC CORPORATION | WESTINGHOUSE ELECTRIC CORPORATION |
Lifetime performance, through 2025
| Unit | Electricity Supplied | Load Factor | Energy Availability | Operating Factor |
|---|---|---|---|---|
| Zion 1 | 124.4 TWh | 57.3% | 62.2% | 63.8% |
Operator: Exelon Generation Co., LLC
Owner: Exelon Generation Co., LLC
Source: IAEA Power Reactor Information System (PRIS), as of 2026-10-14.
Working Here
Jobs in IL 123 active
Active nuclear industry job listings in IL from the NukeWorker job board. Click a job title for full details, or click the header to search all jobs in this state.
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. Lodging rates vary by month — click "Show Monthly" to see the breakdown.
$232
Lodging/Night
$148–$238 range
$92
M&IE/Day
$324
Total/Day
Chicago, Cook / Lake County, IL
Unemployment Benefits IL
Maximum state unemployment insurance benefits for IL. Actual benefits depend on your earnings history and may be lower than the maximum. Data as of Jan 2026.
$859
Max Weekly
26
Max Weeks
$22,334
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.
42.4459, -87.8019
Location & Contact
Physical address, phone number, and website for this facility. Use the directions link to get driving directions via Google Maps.
Phone:
(847) 746-2084
Website:
http://www.exeloncorp.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: Zion Nuclear Power Station.
Zion Nuclear Power Station was on about 257 acres of Lake Michigan shoreline in the city of Zion, Lake County, Illinois, roughly 40 miles north of Chicago. Commonwealth Edison built and ran the plant, which had two Westinghouse four-loop pressurized water reactors.
Read more
Construction began on December 1, 1968. Commercial operation is listed as December 31, 1973, for Unit 1 and September 4, 1974, for Unit 2. Operations stopped on February 21, 1997, after an operator mishandled control rods during a Unit 1 shutdown, and the plant was permanently retired on February 13, 1998. Transfer of spent fuel into dry casks was completed in January 2015, and the NRC released the site for unrestricted use on November 8, 2023.
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.
CEG
Constellation Energy Corporation
NasdaqGS
$273.41
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275.00
Day's Range
270.82 – 276.18
52-Week Range
228.63 – 406.04
Volume
877,788
Delayed quote as of Oct 16, 2026 11:02 AM ET.
Source: Yahoo Finance.
Full quote on Yahoo Finance
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.
Reactor Type:
PWR
Containment:
PWR-DRYAMB
NSS Supplier:
WEST 4LP
Thermal Power:
3250 MWt
Net Capacity:
1040 MWe
Status:
SAFSTOR
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.
Docket #:
05000295
License #:
DPR-39
License Type:
OL-FP
Const. Permit:
1968-12-26
Operating Lic:
1973-10-19
Commercial Op:
1973-12-31
License Exp:
2013-04-06