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Total megawatt-electric generation from the U.S. commercial nuclear fleet on the most recent reporting date.
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Current Generation
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Estimated U.S. homes powered by current nuclear generation, based on the industry standard of approximately 800 homes per megawatt-electric.
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Homes Powered
@ 800 homes/MWe
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Grid utilization: total generation divided by total installed capacity of all reporting units on the most recent date. Green ≥90%, Orange 80-89%, Red <80%.
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Today's Capacity Factor
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Average capacity factor across all days in the selected time range. When a plant is selected, shows quartile rank vs fleet.
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Period Average
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Highest single-day generation (MWe) achieved during the selected time period.
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Period Peak Gen
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Number of days where the fleet capacity factor dropped below 80%. A proxy for significant outage or generation loss events.
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Days Below 80%
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Number of individual reactor units reporting power data on the most recent date. Tracks fleet size over time.
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Reporting Units
Active in Fleet
On the latest reporting day, Jul 8, 2026, the US nuclear fleet was generating about 95,791 MWe, roughly 98.6% of its 97,195 MWe capacity, enough to power around 76,632,800 homes. Across 27 years of daily records the fleet has averaged 89.7% capacity factor, slipping below 80% on 1,116 of 10,043 reported days. Its strongest single day produced 98,744 MWe on Jan 6, 2026.
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Total daily megawatt generation from all reporting U.S. commercial nuclear units compared to their combined installed capacity.
Fleet Generation vs Capacity (MWe)
The green line is what the fleet actually generated each day; the gray line is its total installed capacity. Installed capacity has grown from 92,154 MWe to 97,195 MWe since 1999, while daily generation rises and falls as units go offline for refueling and repairs. The widest gaps between the two lines mark the heaviest outage stretches.
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Daily fleet capacity factor — generation ÷ installed capacity. Red shaded areas highlight periods below 80%. Dashed lines show average capacity factors for other energy sources (EIA data).
Fleet Capacity Factor %
Capacity factor is the share of its maximum output the fleet actually delivers. Over the full record it has averaged 89.7%, among the highest of any power source, and it fell below 80% on only 1,116 of 10,043 reported days. The most recent reading was 98.6%.
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Average capacity factor by month across all years. Blue = winter (Nov–Mar), orange = summer (May–Sep) when outage scheduling differs.
Seasonal Pattern (Monthly Avg)
Fleet capacity factor runs highest in August (about 96.5% on average) and lowest in April (about 78.9%). Output dips in spring and fall because that is when most reactors schedule refueling outages, away from peak summer and winter demand.
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Monthly average capacity factor overlaid for the most recent 5 years, comparing month by month. Current year highlighted in bold green.
Year-over-Year Comparison
In 2025 the fleet averaged 91.2% capacity factor, up from 90.9% the year before. The chart overlays the last five years month by month so you can spot which years ran stronger.
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Reactor units ranked by average capacity factor. Bar thickness reflects unit capacity (MWe). Toggle top/bottom performers or group by owner.
Top & Bottom 10 by Capacity Factor 5yr data
Over the past year, Calvert Cliffs 2 led the fleet at about 100% capacity factor, and 59 of 94 reporting units stayed above 90%. Capacity factors ranged from that high down to about 71.1% for the least-used reactor, typically one that spent much of the year in a refueling outage.
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Average capacity factor by NRC region (I–IV), calculated from per-unit generation data over the last 5 years.
Regional Generation Breakdown 5yr data
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Histogram of days by capacity factor range. Green bins (90–100%) = strong fleet performance; red bins = significant generation loss.
Capacity Factor Distribution
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Interactive map with color-coded circles per reactor. Green ≥90%, orange 80–90%, red <80%. Circle size reflects plant capacity in MWe.
Regional Capacity Factor Map 5yr data
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Number of reactor units reporting power data over time. Hidden when fleet size is stable (e.g. 1-year view).
Fleet Size Over Time
The reporting fleet has ranged from 91 to 94 reactor units over this period, with 94 reporting on the latest day. Most recently, Vogtle 4 came online in Apr 2024.
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Calendar-style grid of daily fleet capacity factor by color. Green = high utilization, red = low. Hover any cell for the exact date and percentage.
Capacity Factor Heatmap (Daily) 5yr data
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80%
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90%
95%+
No data
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Compare two reactor units' monthly capacity factor trends side by side. Useful for benchmarking performance or tracking improvement over time.
Plant Comparison 5yr data
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License expiration timeline per unit. Color = urgency: red <5yr, orange 5–10yr, yellow 10–20yr, green 20+ years remaining.
Fleet Sunset — License Expiration Timeline
The earliest operating license in the fleet expires in 2029 (Nine Mile Point 1), and 16 units have licenses expiring within the next 10 years. These are license dates, not shutdown dates: reactors routinely renew for another 20 years.
Announced retirements (EIA-860M):
none currently announced. License expiration (above) is not a retirement date; units routinely renew their licenses.
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Day-by-day table of fleet generation, capacity, capacity factor, and active unit count. Sortable and exportable to CSV, Excel, or JSON.
Day-by-Day Detailed Data
This table has one row for every reporting day, 10,043 in all from Jan 1, 1999 to Jul 8, 2026. Each row shows fleet generation, capacity, capacity factor, and how many units were online, and you can sort any column or export the full set.
| Date | Generation (MWe) | Homes Powered | Capacity (MWe) | Capacity Factor | Units |
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Notes:
1. Capacity Factor is calculated as
2. Capacity: Sum of “Net MWe” ratings for all active units reporting a power level on that day.
3. Homes Powered: Estimated at 800 homes per MWe, a nuclear-specific approximation reflecting high capacity factors. Actual value varies by region (460–900 homes/MW). See NRC: What is a Megawatt?
4. Sources: Daily Power Levels from NRC Daily Status Reports. Unit MWe ratings from EIA and internal facility records.
5. Historical Data: Legacy data (1999–2004) has been normalized from archival records. Some minor gaps may exist.
6. Per-plant filtering: Available for all years. Selecting 5Y or All range loads additional data on demand.
1. Capacity Factor is calculated as
Total Generation (MWe) / Total Operating Capacity (MWe).2. Capacity: Sum of “Net MWe” ratings for all active units reporting a power level on that day.
3. Homes Powered: Estimated at 800 homes per MWe, a nuclear-specific approximation reflecting high capacity factors. Actual value varies by region (460–900 homes/MW). See NRC: What is a Megawatt?
4. Sources: Daily Power Levels from NRC Daily Status Reports. Unit MWe ratings from EIA and internal facility records.
5. Historical Data: Legacy data (1999–2004) has been normalized from archival records. Some minor gaps may exist.
6. Per-plant filtering: Available for all years. Selecting 5Y or All range loads additional data on demand.
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