?
Composite Operational Excellence Score (0-100) — average percentile rank across 7 dimensions in three sub-scores: Reliability (capacity factor, forced outage days, B2B avg streak), Efficiency (fuel utilization, refuel duration), and Discipline (startup duration, scram count). 5-year window. Higher = more operationally excellent. Click to see the full breakdown.
16
Excellence
#90 of 93
Bottom Quartile
?
Current reactor power level from the most recent NRC daily report.
100%
Power
ONLINE
?
Days of continuous operation since the last outage ended. Ranked against all operating units.
7
Current Run
days
#94 of 95
Bottom Quartile
?
Longest recorded period of continuous operation between outages.
685
Record Run
days
#40 of 95
Mid Quartile
?
Breaker-to-Breaker runs — continuous operation exceeding the cycle-adjusted threshold (604 days for this 24-month cycle unit) with no trips to 0% power.
1
B2B Runs
#83 of 86
Bottom Quartile
?
Lifetime capacity factor: average power level across all recorded days (100% = always at full power). Ranked against all NRC-tracked units.
83.4%
Capacity Factor
#91 of 95
Bottom Quartile
?
Net electricity actually generated over the most recent 12 months reported by the U.S. Energy Information Administration (Form EIA-923). These are authoritative actuals, not an estimate.
8.69 TWh
Net Generation
EIA-923 · 12 mo to 2026-04
?
Community rating score (Bayesian-adjusted). Based on 60 votes. Ranked against all rated facilities.
57.2
Rating
60 votes
#23 of 97
Top Quartile
?
Total NRC-reported scram events (emergency reactor shutdowns). Ranked fleet-wide — fewer scrams = better rank.
11
Scrams
#81 of 94
Bottom Quartile
?
Years since commercial operation began. License remaining: 18.7 years.
38.5
Operating Age
years
18.7 yrs remaining
Reactor Status Timeline
Online NRC data, Mon to Fri ? Actual daily reactor status from NRC reports (Mon to Fri), the current state, and what is coming: the utility's published Scheduled outage plus, for subscribers, NukeWorker's model Projection. Colored by status. How far ahead you can see depends on your plan.OnlineReduced PowerCoastdownPower AscensionRefueling OutageScram⚡Scram (reactor trip)
Estimated reactivity remaining in Fermi 2's current fuel cycle, shown as a stylized fuel rod that drains as the cycle progresses. The cycle starts when the unit returns to power after its most recent refueling outage, and the gauge represents the fraction of that cycle's typical effective full-power days (EFPD) still available. Days at less than 100% power burn fuel proportionally — so a unit with significant downtime (high burn deficit) drains slower and ends with MORE reactivity left, giving operators margin to coast down (extend the cycle by reducing power) instead of refueling on the calendar. The dashed red line near the bottom marks the rough industry coastdown threshold (~15% remaining). Cycle target is the unit's median recent cycle length. Source: NRC daily reactor status reports cross-referenced against scheduled refuel outage history.
Fuel Burn Down Cycle since May 16, 2026
Fermi 2 is 62 days into its current fuel cycle with an estimated 94.2% of its fuel left. Its typical cycle runs about 679 days.
Fresh — 100%
Refuel — 0%
94.2% remaining
Fresh fuel
Cycle progress
62 / 679 days
EFPD remaining
640 days
Effective burn
39 EFPD
Burn deficit
22.7 FPD
Fermi 2 is early in its fuel cycle with 640 EFPD of reactivity remaining. Refuel is not expected for many months.
This unit has accumulated 22.7 FPD of unburned fuel from cycle downtime — that's free margin to extend the cycle if operators want.
This unit has accumulated 22.7 FPD of unburned fuel from cycle downtime — that's free margin to extend the cycle if operators want.
Historical Burn-Down (16 completed cycles)
Avg refuel point
27.3% remaining
Avg refuel (3yr)
1.1% remaining
Deepest burn
1.1% (2024-05 → 2026-03)
Most margin
40.5% (2012-05 → 2014-02)
Last 5 cycles at refuel
29%
2017-04
30%
2018-10
25%
2020-08
6%
2022-05
1%
2024-05
~35% coastdown (this unit)
Composite Operational Excellence Score for Fermi 2 — average percentile rank across 7 publicly observable metrics in three sub-scores: Reliability (capacity factor, forced outage days, B2B avg streak), Efficiency (fuel utilization, refuel duration), and Discipline (startup duration, scram count). Toggle the time window (3yr / 5yr / Lifetime) to see how this unit's standing shifts. Each dimension percentile-ranked across the active US fleet. Sub-score = average of components. Composite = average of the three sub-scores.
NukeWorker's Operational Excellence Score 5-yr composite · ranks 90 of 93 →
NukeWorker scores Fermi 2's operational excellence at 16 out of 100 over the past five years, ranking it 90 of 93 reactors in the active US fleet. The score blends reliability, efficiency, and operating discipline drawn from public performance data.
Time window
NukeWorker's
Operational
Excellence Score
Operational
Excellence Score
16/100
Bottom Quartile · #90/93
5-year window
Fermi 2 ranks #90 of 93 active US units on NukeWorker's Operational Excellence Score over the 5-year window. Strongest area: B2B Avg Streak (71th percentile). Weakest: Scrams (5-year) (7th percentile).
Reliability
34
Capacity factor + Forced outages + B2B streaks
Efficiency
7
Fuel utilization + Refuel duration
Discipline
7
Startup duration + Scram count
Cohort Rankings
apples-to-apples comparison within each peer group
Reactor type:
#30 of 31
BWR
Containment:
#19 of 19
Mark I (BWR)
Cycle length:
#39 of 40
24-month cycle
Fleet rank above (90 of 93) compares all active US units; cohort ranks compare only against units sharing this property.
Per-dimension breakdown (7 metrics)
Capacity Factor
10th
82.7% (higher better, Reliability)
Forced Outage Days/yr
22th
7.4d (lower better, Reliability)
B2B Avg Streak
71th
682d (higher better, Reliability)
Refuel Duration
7th
49d (lower better, Efficiency)
Scrams (5-year)
7th
1.0/yr (lower better, Discipline)
Each dimension's percentile is computed across the active US fleet (93 units with sufficient history). Sub-score = average of its component percentiles. Composite = average of the three sub-scores. 5-year window. View full leaderboard →
Methodology
NukeWorker's Operational Excellence Score is a composite ranking that combines 7 publicly observable performance metrics into a single 0-100 number per US nuclear unit.
How it's computed: Each unit's raw value is converted to a percentile (0-100) within the 93 active US units that have at least 2 completed refueling cycles. The 7 percentiles are averaged into 3 sub-scores (Reliability, Efficiency, Discipline), and those are averaged into the final composite.
Active window — 5-year:
- Reliability — Capacity factor (5yr), forced outage days/yr (5yr), B2B avg streak (lifetime)
- Efficiency — in-cycle fuel utilization (3yr), median refuel duration (5yr)
- Discipline — robust mean startup duration, scrams/yr (5yr, annualised)
Cohort rankings: alongside the fleet rank, each unit gets ranked within its reactor type (PWR/BWR), containment design (Ice Condenser, Mark I, etc.), and cycle length (12/18/24-month). Useful for apples-to-apples comparisons.
What's excluded: subjective community ratings, confidential INPO ratings, financial metrics. We only use publicly available NRC + cycle data.
Why three windows? 5yr (default) is the industry standard. 3yr captures recent operational changes and post-pandemic recovery. Lifetime gives newer units a fair comparison and reveals long-term consistency.
Edge cases: units with fewer than 2 cycles (e.g., Vogtle 4) show "Provisional". Decommissioned units excluded.
Refresh cadence: recomputed daily. Each window cached separately.
A data-derived proxy for operational performance; not affiliated with INPO. INPO ratings are confidential and qualitative — ours is public and quantitative.
5-yr trend:
Stable vs 2025
Compare Fermi 2 head-to-head with up to 3 other units.
Compare now
Capacity Factor (365-Day)
100%
Current
77.2%
365-Day Avg
#94
of 94 plants
Min: 0%
Max: 100%
75 days <80%
Breaker-to-Breaker Runs 1 run
Breaker-to-breaker runs measure continuous operation between refueling outages using a cycle-adjusted threshold (90% of cycle length minus RFO duration). An active streak means the unit has been running continuously since the last refueling with no trips to 0% power.
Fermi 2 has logged 1 breaker-to-breaker run, continuous stretches from one refueling to the next with no trip to zero power. Its longest ran 682 days, and its runs average 682 days.
682
Best Run (days)
2024-05-10 → 2026-03-23
682
Avg Run (days)
Scram History 11 events since 2011
Automatic and manual reactor scram (emergency shutdown) events reported to the NRC since 2011. Includes event dates, trip type, and average recovery time. Click the title to view the full fleet scram dashboard.
Fermi 2 has recorded 11 reactor scrams, or emergency shutdowns, since 2011 (7 automatic, 4 manual). On average the unit was back to full power about 31.2 days after each trip.
Outage Duration Trend
?Scheduled refueling outage durations over time. Green bars are below average, yellow near average, red above. Dashed line shows the plant's historical average. Shorter outages mean better execution.
Fermi 2 has completed 17 scheduled refueling outages on record, averaging 50 days each. The most recent, in Mar 2026, ran 50 days.
Power History (12-Month)
?Daily power output as a percentage of rated capacity over the past 365 days. Green segments indicate full power (90%+), yellow shows reduced output, and red indicates significant power reductions or shutdowns.
Over the past 12 months Fermi 2 has run at an average of 77.2% of rated power. On the chart, green stretches are full-power running and dips toward zero mark reduced output or outages.
Outage Days by Year
?Total days spent in outage each year, split by scheduled refueling (blue) and forced/unplanned (red). Lower totals indicate better reliability and outage execution. Hover for details.
Across its recorded history, Fermi 2 has spent 845 days in scheduled refueling outages and 396 days in forced or unplanned outages. Taller bars mark the years with the most downtime.
Facility Statistics
Key performance and lifecycle metrics calculated from NRC operational data. Includes operating age, construction timeline, capacity factor, efficiency, generation totals, and reliability records.
Fermi 2 has operated for about 38.5 years and averaged a 83.4% lifetime capacity factor, generating roughly 228.3 TWh of electricity. Its longest unbroken run reached 685 days.
Lifecycle & Tenure
Operating Age: 38.5 Yrs
Build Time: 15.3 Yrs
Lic. Remaining: 18.7 Yrs
Production & Power
Lifetime CF: 83.4%
Efficiency: 32.7%
Generated: 228.3 TWh
Reliability & Outages
Record Run: 685 Days
Refuelings: 17
Avg Startup: 7.4 Days
NukeWorker Member Ratings 60 votes
Community ratings from NukeWorker members. Vote to share your experience working at this facility. Score uses a Bayesian average that accounts for vote count — facilities with few votes are pulled toward the fleet average, so rankings reflect confidence, not just raw percentages.
Above Average
30 (50%)
Average
12 (20%)
Below Average
18 (30%)
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.
41.9636, -83.2581
Location & Contact
Physical address, phone number, and website for this facility. Use the directions link to get driving directions via Google Maps.
Phone:
(313) 586-5300
Website:
http://www.detroitedison.com/
Per Diem Rates FY 2026
Per diem covers lodging and meals & incidental expenses (M&IE) for government and contractor travel near this facility. Rates are from GSA for FY 2026.
$110
Lodging/Night
$68
M&IE/Day
$178
Total/Day
Standard Rate, MI
Unemployment Benefits MI
Maximum state unemployment insurance benefits for MI. Actual benefits depend on your earnings history and may be lower than the maximum. Data as of Jan 2026.
$530
Max Weekly
26
Max Weeks
$13,780
Max Total
Jobs in MI 5 active
Active nuclear industry job listings in MI from the NukeWorker job board. Click a job title for full details, or click the header to search all jobs in this state.
Photos
Photos of this facility from the NukeWorker photo gallery. Click the header or any photo to browse the full album.
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.
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:
BWR
Containment:
BWR-MARK 1
NSS Supplier:
GE 4
Thermal Power:
3486 MWt
Net Capacity:
1141 MWe
Efficiency:
32.7%
Status:
Operating
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 #:
05000341
License #:
NPF-43
License Type:
OL-FP
Const. Permit:
1972-09-26
Operating Lic:
1985-03-20
Commercial Op:
1988-01-23
License Renewed:
2016-12-15
License Exp:
2045-03-20
Market & Region
EIA market and grid-region classifications: NERC reliability region, U.S. Census region, balancing authority responsible for grid operations, and whether the unit operates as a rate-regulated utility or a competitive merchant generator. Hover any value for the full name.
NERC Region:
RFC
— Reliability First Corporation
Census Region:
ENC
— East North Central
Balancing Authority:
MISO
— Midcontinent Independent System Operator (ISO/RTO)
Market Structure:
Regulated
— Rate-regulated utility (cost-of-service pricing)