?
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.
53
Excellence
#35 of 93
Mid 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.
342
Current Run
days
#24 of 95
Top Quartile
?
Longest recorded period of continuous operation between outages.
535
Record Run
days
#78 of 95
Bottom Quartile
?
Breaker-to-Breaker runs — continuous operation exceeding the cycle-adjusted threshold (458 days for this 18-month cycle unit) with no trips to 0% power.
8
B2B Runs
#21 of 87
Top Quartile
?
Lifetime capacity factor: average power level across all recorded days (100% = always at full power). Ranked against all NRC-tracked units.
92.7%
Capacity Factor
#19 of 95
Top Quartile
?
Net electricity actually generated over the most recent 12 months reported by the U.S. Energy Information Administration (Form EIA-923), summed across every unit at this plant. These are authoritative actuals, not an estimate.
20.02 TWh
Net Generation
EIA-923 · 12 mo to 2026-06 · plant total
?
Community rating score (Bayesian-adjusted). Based on 52 votes. Ranked against all rated facilities.
71.9
Rating
52 votes
#2 of 97
Top Quartile
?
Total NRC-reported scram events (emergency reactor shutdowns). Ranked fleet-wide — fewer scrams = better rank.
5
Scrams
#26 of 94
Mid Quartile
?
Years since commercial operation began. License remaining: 23.4 years.
36.1
Operating Age
years
23.4 yrs remaining
Reactor Status Timeline
Online NRC data, Mon to Fri ? Actual daily reactor status from NRC reports (Mon to Fri) and the current state. What is coming -- the utility's published Scheduled outage and NukeWorker's model Projection -- is part of a subscription. Colored by status. How far ahead you can see depends on your plan.OnlineReduced PowerScram⚡Scram (reactor trip)
Estimated reactivity remaining in Comanche Peak 1'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 15, 2025
Comanche Peak 1 is 476 days into its current fuel cycle with an estimated 8.8% of its fuel left. Its typical cycle runs about 518 days.
Fresh — 100%
Refuel — 0%
8.8% remaining
Coastdown territory
Cycle progress
476 / 518 days
EFPD remaining
46 days
Effective burn
472 EFPD
Burn deficit
3.8 FPD
Comanche Peak 1 is in coastdown territory — operators may reduce power to stretch the cycle or accept the calendar refuel date.
Historical Burn-Down (17 completed cycles)
Avg refuel point
2.4% remaining
Avg refuel (3yr)
0.5% remaining
Deepest burn
0.0% (2007-04 → 2008-09)
Most margin
10.7% (2002-11 → 2004-03)
Last 5 cycles at refuel
0%
2017-11
3%
2019-05
1%
2020-11
3%
2022-05
1%
2023-11
~5% coastdown (this unit)
Composite Operational Excellence Score for Comanche Peak 1 — 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 35 of 93 →
NukeWorker scores Comanche Peak 1's operational excellence at 53 out of 100 over the past five years, ranking it 35 of 93 reactors in the active US fleet. The score blends reliability, efficiency, and operating discipline drawn from public performance data.
Time window
5-yr trend:
Stable vs 2025
Compare Comanche Peak 1 head-to-head with up to 3 other units.
Compare now
Capacity Factor (365-Day)
100%
Current
99%
365-Day Avg
#21
of 94 plants
Min: 0%
Max: 100%
5 days <80%
Breaker-to-Breaker Runs 8 runs
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.
Comanche Peak 1 has logged 8 breaker-to-breaker runs, continuous stretches from one refueling to the next with no trip to zero power. Its longest ran 531 days, and its runs average 510 days.
531
Best Run (days)
1RF19 (2017-11-07) → 1RF20 (2019-04-22)
510
Avg Run (days)
★ 5-run breaker-to-breaker
1RF17 → 1RF18 → 1RF19 → 1RF20 → 1RF21 → 1RF22
All Runs
| 2020-11-09 | 2022-04-11 | 518 days | 1RF21 → 1RF22 |
| 2019-05-27 | 2020-10-11 | 503 days | 1RF20 → 1RF21 |
| 2017-11-07 | 2019-04-22 | 531 days | 1RF19 → 1RF20 |
| 2016-06-01 | 2017-10-09 | 495 days | 1RF18 → 1RF19 |
| 2014-11-27 | 2016-05-02 | 522 days | 1RF17 → 1RF18 |
| 2005-11-08 | 2007-02-25 | 474 days | 1RF11 → 1RF12 |
| 2004-05-04 | 2005-10-09 | 523 days | 1RF10 → 1RF11 |
| 1999-10-30 | 2001-03-25 | 512 days | 1RF7 → 1RF8 |
Scram History 5 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.
Comanche Peak 1 has recorded 5 reactor scrams, or emergency shutdowns, since 2011 (3 automatic, 2 manual). On average the unit was back to full power about 9.4 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.
Comanche Peak 1 has completed 18 scheduled refueling outages on record, averaging 32 days each. The most recent, in Apr 2025, ran 24 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 Comanche Peak 1 has run at an average of 99% 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, Comanche Peak 1 has spent 574 days in scheduled refueling outages and 78 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.
Comanche Peak 1 has operated for about 36.1 years and averaged a 92.7% lifetime capacity factor, generating roughly 273.9 TWh of electricity. Its longest unbroken run reached 535 days.
Lifecycle & Tenure
Operating Age: 36.1 Yrs
Build Time: 15.6 Yrs
Lic. Remaining: 23.4 Yrs
Production & Power
Lifetime CF: 92.7%
Efficiency: 33.5%
Generated: 273.9 TWh
Reliability & Outages
Record Run: 535 Days
Refuelings: 18
Avg Startup: 7.5 Days
NukeWorker Member Ratings 52 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
39 (75%)
Average
10 (19%)
Below Average
3 (5%)
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.
32.2985, -97.7882
Location & Contact
Physical address, phone number, and website for this facility. Use the directions link to get driving directions via Google Maps.
Phone:
(817) 897-8881
Website:
http://txu.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, TX
Unemployment Benefits TX
Maximum state unemployment insurance benefits for TX. Actual benefits depend on your earnings history and may be lower than the maximum. Data as of Jan 2026.
$605
Max Weekly
26
Max Weeks
$15,730
Max Total
7-day waiting period before benefits begin
Jobs in TX 72 active
Active nuclear industry job listings in TX 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.
![The real "Comanche Peak"](https://www.nukeworker.com/pictures/albums/userpics/12401/thumb_IMG_3482.jpg "The real "Comanche Peak"
1797 views")
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.
VST
Vistra Corp.
NYSE
$143.81
▲ +0.34 (+0.24%)
Previous Close
143.46
Day's Range
142.81 – 148.78
52-Week Range
132.66 – 219.82
Volume
3,353,740
Delayed quote as of Sep 3, 2026 3:36 PM 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:
3612 MWt
Net Capacity:
1209 MWe
Efficiency:
33.5%
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 #:
05000445
License #:
NPF-87
License Type:
OL-FP
Const. Permit:
1974-12-19
Operating Lic:
1990-04-17
Commercial Op:
1990-08-13
License Renewed:
2024-07-30
License Exp:
2050-02-08
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:
TRE
— Texas Regional Entity
Census Region:
WSC
— West South Central
Balancing Authority:
ERCO
— Electric Reliability Council of Texas (ERCOT) (ISO/RTO)
Market Structure:
Merchant
— Competitive generator selling into wholesale markets