Fleet Rankings

Which US nuclear operator runs the best fleet? Composite of 7 publicly observable performance metrics, aggregated by owner. Data refreshed 8.1h ago

20
Operators Ranked
93 active units total
74
Top Fleet
Constellation Energy · 21 units
16
Bottom Fleet
DTE Energy · 1 units
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Fleet size: All 20 Mega-fleet (8+) Mid (3–7) Small (1–2) Showing 20 of 20 operators

Operator Fleet Excellence Leaderboard Click any row to expand the unit-level breakdown

# Operator Composite Reliability Efficiency Discipline Units Top Q Bottom Q Best Worst
1 Constellation Energy Top Quartile 74 77 85 60 21 76% 0% Peach Bottom 3 91 Calvert Cliffs 2 45

Constellation Energy — 21 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Peach Bottom 3 PA 91 96 88 90 Top Quartile #1 / 93
Byron 2 IL 90 83 98 90 Top Quartile #2 / 93
Limerick 2 PA 89 84 94 90 Top Quartile #3 / 93
Limerick 1 PA 88 81 94 90 Top Quartile #4 / 93
Braidwood 2 IL 87 79 94 90 Top Quartile #5 / 93
Byron 1 IL 83 72 88 90 Top Quartile #7 / 93
Calvert Cliffs 1 MD 83 72 88 90 Top Quartile #8 / 93
Dresden 2 IL 81 89 85 70 Top Quartile #10 / 93
Dresden 3 IL 78 70 94 70 Top Quartile #14 / 93
Quad Cities 1 IL 78 78 85 70 Top Quartile #15 / 93
FitzPatrick NY 76 92 88 48 Top Quartile #17 / 93
Braidwood 1 IL 75 78 98 48 Top Quartile #18 / 93
LaSalle 1 IL 74 79 94 48 Top Quartile #19 / 93
LaSalle 2 IL 73 68 81 70 Top Quartile #20 / 93
Ginna NY 71 70 94 48 Top Quartile #22 / 93
Nine Mile Point 1 NY 68 87 28 90 Top Quartile #24 / 93
Peach Bottom 2 PA 66 85 100 15 Mid Quartile #25 / 93
Nine Mile Point 2 NY 54 65 83 15 Mid Quartile #33 / 93
Clinton IL 53 60 70 29 Mid Quartile #36 / 93
Quad Cities 2 IL 50 57 79 15 Mid Quartile #41 / 93
Calvert Cliffs 2 MD 45 73 61 1 Mid Quartile #54 / 93
2 Duke Energy Top Quartile 62 63 62 63 11 36% 0% Oconee 1 84 Catawba 2 42

Duke Energy — 11 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Oconee 1 SC 84 89 73 90 Top Quartile #6 / 93
Oconee 3 SC 81 71 83 90 Top Quartile #9 / 93
Brunswick 2 NC 79 78 70 90 Top Quartile #12 / 93
Catawba 1 SC 72 57 70 90 Top Quartile #21 / 93
Brunswick 1 NC 65 62 64 70 Mid Quartile #26 / 93
Oconee 2 SC 59 69 79 29 Mid Quartile #27 / 93
McGuire 1 NC 56 67 31 70 Mid Quartile #31 / 93
McGuire 2 NC 53 47 64 48 Mid Quartile #35 / 93
Harris 1 NC 48 64 64 15 Mid Quartile #45 / 93
Robinson 2 SC 47 52 18 70 Mid Quartile #51 / 93
Catawba 2 SC 42 38 59 29 Mid Quartile #57 / 93
3 Pacific Gas & Electric Top Quartile 51 50 33 70 2 0% 0% Diablo Canyon 1 57 Diablo Canyon 2 44

Pacific Gas & Electric — 2 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Diablo Canyon 1 CA 57 58 44 70 Mid Quartile #28 / 93
Diablo Canyon 2 CA 44 42 22 70 Mid Quartile #55 / 93
4 NextEra Energy Top Quartile 50 48 51 52 7 29% 43% Point Beach 1 80 Saint Lucie 2 30

NextEra Energy — 7 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Point Beach 1 WI 80 71 79 90 Top Quartile #11 / 93
Point Beach 2 WI 78 66 79 90 Top Quartile #13 / 93
Turkey Point 4 FL 56 50 50 70 Mid Quartile #30 / 93
Seabrook 1 NH 44 48 37 48 Mid Quartile #56 / 93
Saint Lucie 1 FL 34 44 44 15 Bottom Quartile #72 / 93
Saint Lucie 2 FL 30 29 12 48 Bottom Quartile #80 / 93
Turkey Point 3 FL 30 29 55 6 Bottom Quartile #81 / 93
5 STP Nuclear Operating Top Quartile 48 41 55 49 2 0% 0% South Texas 1 56 South Texas 2 41

STP Nuclear Operating — 2 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
South Texas 1 TX 56 42 55 70 Mid Quartile #32 / 93
South Texas 2 TX 41 40 55 29 Mid Quartile #60 / 93
6 PSEG Nuclear Mid Quartile 47 46 26 69 3 0% 0% Salem 1 57 Hope Creek 1 37

PSEG Nuclear — 3 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Salem 1 NJ 57 58 22 90 Mid Quartile #29 / 93
Salem 2 NJ 47 53 18 70 Mid Quartile #49 / 93
Hope Creek 1 NJ 37 27 37 48 Mid Quartile #66 / 93
7 Nebraska Public Power District Mid Quartile 46 75 14 48 1 0% 0% Cooper 46 Cooper 46

Nebraska Public Power District — 1 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Cooper NE 46 75 14 48 Mid Quartile #53 / 93
8 Arizona Public Service Mid Quartile 45 42 32 62 3 0% 33% Palo Verde 1 54 Palo Verde 2 34

Arizona Public Service — 3 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Palo Verde 1 AZ 54 55 37 70 Mid Quartile #34 / 93
Palo Verde 3 AZ 48 44 31 70 Mid Quartile #43 / 93
Palo Verde 2 AZ 34 27 28 48 Bottom Quartile #71 / 93
9 Vistra Corp. Mid Quartile 44 48 45 40 6 17% 33% Davis-Besse 69 Perry 1 27

Vistra Corp. — 6 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Davis-Besse OH 69 54 64 90 Top Quartile #23 / 93
Comanche Peak 1 TX 50 55 68 29 Mid Quartile #40 / 93
Comanche Peak 2 TX 46 55 55 29 Mid Quartile #52 / 93
Beaver Valley 2 PA 42 55 55 15 Mid Quartile #58 / 93
Beaver Valley 1 PA 31 41 22 29 Bottom Quartile #78 / 93
Perry 1 OH 27 28 6 48 Bottom Quartile #83 / 93
10 Energy Northwest Mid Quartile 41 52 3 70 1 0% 0% Columbia Generating Station 41 Columbia Generating Station 41

Energy Northwest — 1 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Columbia Generating Station WA 41 52 3 70 Mid Quartile #59 / 93
11 Southern Nuclear Mid Quartile 40 41 49 31 7 14% 43% Vogtle 2 76 Vogtle 3 6

Southern Nuclear — 7 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Vogtle 2 GA 76 66 73 90 Top Quartile #16 / 93
Farley 1 AL 52 49 59 48 Mid Quartile #37 / 93
Vogtle 1 GA 51 48 76 29 Mid Quartile #39 / 93
Hatch 2 GA 41 44 50 29 Mid Quartile #61 / 93
Farley 2 AL 33 48 37 15 Bottom Quartile #74 / 93
Hatch 1 GA 24 30 37 6 Bottom Quartile #86 / 93
Vogtle 3 GA 6 4 12 1 Bottom Quartile #93 / 93
12 Xcel Energy Mid Quartile 39 35 52 31 3 0% 33% Prairie Island 1 52 Monticello 28

Xcel Energy — 3 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Prairie Island 1 MN 52 32 76 48 Mid Quartile #38 / 93
Prairie Island 2 MN 38 41 44 29 Mid Quartile #63 / 93
Monticello MN 28 32 37 15 Bottom Quartile #82 / 93
13 Tennessee Valley Authority Mid Quartile 39 32 44 40 7 0% 43% Browns Ferry 3 50 Sequoyah 1 26

Tennessee Valley Authority — 7 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Browns Ferry 3 AL 50 36 44 70 Mid Quartile #42 / 93
Browns Ferry 2 AL 48 66 31 48 Mid Quartile #44 / 93
Browns Ferry 1 AL 47 43 70 29 Mid Quartile #47 / 93
Watts Bar 1 TN 36 15 44 48 Mid Quartile #69 / 93
Sequoyah 2 TN 33 21 31 48 Bottom Quartile #75 / 93
Watts Bar 2 TN 30 23 61 6 Bottom Quartile #79 / 93
Sequoyah 1 TN 26 23 25 29 Bottom Quartile #84 / 93
14 Talen Energy Mid Quartile 37 54 26 31 2 0% 0% Susquehanna 2 38 Susquehanna 1 37

Talen Energy — 2 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Susquehanna 2 PA 38 63 2 48 Mid Quartile #65 / 93
Susquehanna 1 PA 37 45 50 15 Mid Quartile #68 / 93
15 Dominion Energy Mid Quartile 35 29 25 51 7 0% 43% North Anna 2 47 Summer 12

Dominion Energy — 7 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
North Anna 2 VA 47 28 44 70 Mid Quartile #48 / 93
Surry 2 VA 47 40 10 90 Mid Quartile #50 / 93
Millstone 2 CT 41 24 50 48 Mid Quartile #62 / 93
Millstone 3 CT 37 26 15 70 Mid Quartile #67 / 93
North Anna 1 VA 34 36 37 29 Bottom Quartile #73 / 93
Surry 1 VA 31 41 4 48 Bottom Quartile #77 / 93
Summer SC 12 11 18 6 Bottom Quartile #91 / 93
16 Indiana Michigan Power Bottom Quartile 31 38 25 31 2 0% 50% D.C. Cook 1 38 D.C. Cook 2 25

Indiana Michigan Power — 2 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
D.C. Cook 1 MI 38 40 25 48 Mid Quartile #64 / 93
D.C. Cook 2 MI 25 36 25 15 Bottom Quartile #85 / 93
17 Wolf Creek Nuclear Bottom Quartile 31 34 12 48 1 0% 100% Wolf Creek 1 31 Wolf Creek 1 31

Wolf Creek Nuclear — 1 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Wolf Creek 1 KS 31 34 12 48 Bottom Quartile #76 / 93
18 Entergy Bottom Quartile 26 29 17 30 5 0% 60% Arkansas Nuclear 2 48 Waterford 3 11

Entergy — 5 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Arkansas Nuclear 2 AR 48 44 9 90 Mid Quartile #46 / 93
Arkansas Nuclear 1 AR 35 26 50 29 Mid Quartile #70 / 93
River Bend 1 LA 18 31 9 15 Bottom Quartile #88 / 93
Grand Gulf 1 MS 16 29 18 3 Bottom Quartile #89 / 93
Waterford 3 LA 11 17 1 15 Bottom Quartile #92 / 93
19 Ameren Missouri Bottom Quartile 22 14 5 48 1 0% 100% Callaway 22 Callaway 22

Ameren Missouri — 1 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Callaway MO 22 14 5 48 Bottom Quartile #87 / 93
20 DTE Energy Bottom Quartile 16 35 6 6 1 0% 100% Fermi 2 16 Fermi 2 16

DTE Energy — 1 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Fermi 2 MI 16 35 6 6 Bottom Quartile #90 / 93
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How fleet rankings are computed

NukeWorker's Operational Excellence Score ranks every active US nuclear unit on a 0–100 composite of seven publicly observable performance metrics. This page rolls those unit scores up to the operator level so you can see which company runs the best fleet.

Aggregation: Each operator's fleet score is the simple unweighted average of its scored units' composites and sub-scores. We use unweighted averaging (rather than MWe-weighted) because this is meant to reward consistency across the fleet — a single weak performer drags an operator down regardless of nameplate, which is what an "operator excellence" metric should measure.

  • Composite — average of the unit composites in the fleet.
  • Top Q / Bottom Q — share of the operator's units that fall in the top and bottom INPO-style quartiles of the full fleet.
  • Best / Worst — the operator's highest- and lowest-scoring individual units.
  • Provisional units (e.g. Vogtle 4) and decommissioned units are excluded from the operator's average.

Fleet-size buckets: mega-fleet (8+ units), mid (3–7), small (1–2). Use the pills above to compare like-sized operators.

Refreshes daily. See the unit-level Operator Efficiency Leaderboard →