Fleet Rankings

Which US nuclear operator runs the best fleet? Composite of 7 publicly observable performance metrics, aggregated by owner. Data refreshed 14.8h ago

20
Operators Ranked
93 active units total
70
Top Fleet
Constellation Energy · 21 units
22
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 70 76 71 63 21 76% 0% Peach Bottom 3 88 Clinton 41

Constellation Energy — 21 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Peach Bottom 3 PA 88 96 77 92 Top Quartile #2 / 93
Byron 2 IL 88 83 95 86 Top Quartile #3 / 93
Braidwood 2 IL 87 77 95 89 Top Quartile #4 / 93
Limerick 2 PA 81 83 89 71 Top Quartile #5 / 93
LaSalle 2 IL 79 69 90 78 Top Quartile #6 / 93
Byron 1 IL 78 70 90 74 Top Quartile #7 / 93
Calvert Cliffs 1 MD 78 69 77 86 Top Quartile #8 / 93
Braidwood 1 IL 75 78 89 57 Top Quartile #10 / 93
Quad Cities 1 IL 74 78 69 74 Top Quartile #11 / 93
Dresden 2 IL 73 88 78 54 Top Quartile #13 / 93
Limerick 1 PA 72 78 70 68 Top Quartile #14 / 93
Dresden 3 IL 72 71 65 81 Top Quartile #15 / 93
LaSalle 1 IL 70 77 70 62 Top Quartile #20 / 93
FitzPatrick NY 70 89 64 55 Top Quartile #21 / 93
Ginna NY 69 69 90 47 Top Quartile #22 / 93
Peach Bottom 2 PA 65 88 67 41 Top Quartile #24 / 93
Nine Mile Point 1 NY 61 88 25 71 Mid Quartile #28 / 93
Calvert Cliffs 2 MD 54 74 45 41 Mid Quartile #37 / 93
Nine Mile Point 2 NY 51 64 54 35 Mid Quartile #41 / 93
Quad Cities 2 IL 49 57 55 35 Mid Quartile #50 / 93
Clinton IL 41 55 46 22 Mid Quartile #62 / 93
2 Duke Energy Top Quartile 65 63 66 65 11 36% 0% Oconee 1 91 Robinson 2 50

Duke Energy — 11 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Oconee 1 SC 91 92 87 95 Top Quartile #1 / 93
Oconee 3 SC 77 69 68 95 Top Quartile #9 / 93
Catawba 1 SC 73 55 77 89 Top Quartile #12 / 93
McGuire 1 NC 71 67 63 82 Top Quartile #18 / 93
Harris 1 NC 65 65 78 52 Mid Quartile #25 / 93
Oconee 2 SC 65 70 63 61 Mid Quartile #26 / 93
Brunswick 2 NC 61 78 58 48 Mid Quartile #27 / 93
McGuire 2 NC 54 46 65 52 Mid Quartile #34 / 93
Catawba 2 SC 53 38 69 53 Mid Quartile #38 / 93
Brunswick 1 NC 51 60 51 41 Mid Quartile #43 / 93
Robinson 2 SC 50 53 47 50 Mid Quartile #48 / 93
3 NextEra Energy Top Quartile 52 48 57 51 7 29% 14% Point Beach 1 72 Turkey Point 3 33

NextEra Energy — 7 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Point Beach 1 WI 72 72 88 56 Top Quartile #16 / 93
Point Beach 2 WI 72 65 85 64 Top Quartile #17 / 93
Seabrook 1 NH 51 46 51 55 Mid Quartile #44 / 93
Turkey Point 4 FL 50 50 54 46 Mid Quartile #49 / 93
Saint Lucie 1 FL 47 44 51 46 Mid Quartile #52 / 93
Saint Lucie 2 FL 39 28 17 72 Mid Quartile #65 / 93
Turkey Point 3 FL 33 28 54 18 Bottom Quartile #76 / 93
4 Arizona Public Service Top Quartile 49 43 48 56 3 0% 33% Palo Verde 1 61 Palo Verde 2 34

Arizona Public Service — 3 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Palo Verde 1 AZ 61 59 54 70 Mid Quartile #30 / 93
Palo Verde 3 AZ 53 45 55 58 Mid Quartile #39 / 93
Palo Verde 2 AZ 34 25 36 40 Bottom Quartile #72 / 93
5 STP Nuclear Operating Top Quartile 48 42 52 49 2 0% 0% South Texas 2 52 South Texas 1 43

STP Nuclear Operating — 2 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
South Texas 2 TX 52 44 63 50 Mid Quartile #40 / 93
South Texas 1 TX 43 40 41 48 Mid Quartile #59 / 93
6 Vistra Corp. Mid Quartile 47 48 50 44 6 17% 17% Davis-Besse 66 Perry 1 21

Vistra Corp. — 6 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Davis-Besse OH 66 52 62 84 Top Quartile #23 / 93
Comanche Peak 1 TX 54 56 54 52 Mid Quartile #35 / 93
Beaver Valley 2 PA 51 54 67 32 Mid Quartile #42 / 93
Comanche Peak 2 TX 51 54 60 38 Mid Quartile #46 / 93
Beaver Valley 1 PA 43 43 50 34 Mid Quartile #60 / 93
Perry 1 OH 21 29 7 27 Bottom Quartile #87 / 93
7 PSEG Nuclear Mid Quartile 47 45 42 54 3 0% 33% Salem 1 61 Hope Creek 1 30

PSEG Nuclear — 3 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Salem 1 NJ 61 59 48 76 Mid Quartile #29 / 93
Salem 2 NJ 51 51 52 48 Mid Quartile #45 / 93
Hope Creek 1 NJ 30 25 27 38 Bottom Quartile #81 / 93
8 Nebraska Public Power District Mid Quartile 45 78 24 33 1 0% 0% Cooper 45 Cooper 45

Nebraska Public Power District — 1 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Cooper NE 45 78 24 33 Mid Quartile #57 / 93
9 Pacific Gas & Electric Mid Quartile 45 51 34 49 2 0% 0% Diablo Canyon 1 47 Diablo Canyon 2 42

Pacific Gas & Electric — 2 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Diablo Canyon 1 CA 47 59 36 46 Mid Quartile #53 / 93
Diablo Canyon 2 CA 42 43 31 53 Mid Quartile #61 / 93
10 Dominion Energy Mid Quartile 44 30 38 64 7 0% 14% Surry 2 59 Summer 19

Dominion Energy — 7 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Surry 2 VA 59 38 49 89 Mid Quartile #31 / 93
Millstone 2 CT 55 26 57 83 Mid Quartile #32 / 93
Surry 1 VA 50 42 48 61 Mid Quartile #47 / 93
North Anna 1 VA 46 37 61 40 Mid Quartile #54 / 93
North Anna 2 VA 45 28 28 80 Mid Quartile #56 / 93
Millstone 3 CT 35 29 10 67 Mid Quartile #70 / 93
Summer SC 19 11 15 31 Bottom Quartile #89 / 93
11 Wolf Creek Nuclear Mid Quartile 43 35 30 65 1 0% 0% Wolf Creek 1 43 Wolf Creek 1 43

Wolf Creek Nuclear — 1 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Wolf Creek 1 KS 43 35 30 65 Mid Quartile #58 / 93
12 Southern Nuclear Mid Quartile 40 40 49 32 7 14% 43% Vogtle 2 70 Vogtle 3 18

Southern Nuclear — 7 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Vogtle 2 GA 70 65 63 81 Top Quartile #19 / 93
Vogtle 1 GA 54 47 64 50 Mid Quartile #36 / 93
Farley 1 AL 49 49 66 30 Mid Quartile #51 / 93
Farley 2 AL 39 50 44 23 Mid Quartile #64 / 93
Hatch 2 GA 33 44 36 19 Bottom Quartile #75 / 93
Hatch 1 GA 19 17 31 9 Bottom Quartile #88 / 93
Vogtle 3 GA 18 4 39 12 Bottom Quartile #90 / 93
13 Energy Northwest Mid Quartile 36 52 21 37 1 0% 0% Columbia Generating Station 36 Columbia Generating Station 36

Energy Northwest — 1 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Columbia Generating Station WA 36 52 21 37 Mid Quartile #69 / 93
14 Tennessee Valley Authority Mid Quartile 34 33 35 35 7 0% 57% Browns Ferry 2 46 Watts Bar 1 24

Tennessee Valley Authority — 7 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Browns Ferry 2 AL 46 66 42 29 Mid Quartile #55 / 93
Browns Ferry 1 AL 39 44 41 32 Mid Quartile #66 / 93
Watts Bar 2 TN 38 26 65 25 Mid Quartile #67 / 93
Browns Ferry 3 AL 33 35 26 38 Bottom Quartile #74 / 93
Sequoyah 2 TN 31 21 29 44 Bottom Quartile #78 / 93
Sequoyah 1 TN 28 22 20 42 Bottom Quartile #82 / 93
Watts Bar 1 TN 24 15 23 34 Bottom Quartile #85 / 93
15 Talen Energy Mid Quartile 34 53 33 16 2 0% 50% Susquehanna 2 41 Susquehanna 1 27

Talen Energy — 2 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Susquehanna 2 PA 41 64 31 28 Mid Quartile #63 / 93
Susquehanna 1 PA 27 41 34 5 Bottom Quartile #83 / 93
16 Indiana Michigan Power Bottom Quartile 33 32 35 31 2 0% 100% D.C. Cook 1 35 D.C. Cook 2 31

Indiana Michigan Power — 2 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
D.C. Cook 1 MI 35 37 29 38 Bottom Quartile #71 / 93
D.C. Cook 2 MI 31 27 42 24 Bottom Quartile #79 / 93
17 Xcel Energy Bottom Quartile 32 35 31 29 3 0% 67% Prairie Island 1 38 Monticello 26

Xcel Energy — 3 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Prairie Island 1 MN 38 31 38 45 Mid Quartile #68 / 93
Prairie Island 2 MN 32 41 30 24 Bottom Quartile #77 / 93
Monticello MN 26 33 25 19 Bottom Quartile #84 / 93
18 Ameren Missouri Bottom Quartile 30 11 22 58 1 0% 100% Callaway 30 Callaway 30

Ameren Missouri — 1 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Callaway MO 30 11 22 58 Bottom Quartile #80 / 93
19 Entergy Bottom Quartile 25 30 17 29 5 0% 80% Arkansas Nuclear 2 54 Grand Gulf 1 11

Entergy — 5 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Arkansas Nuclear 2 AR 54 43 43 77 Mid Quartile #33 / 93
Arkansas Nuclear 1 AR 34 27 29 45 Bottom Quartile #73 / 93
River Bend 1 LA 17 34 8 8 Bottom Quartile #91 / 93
Waterford 3 LA 11 18 1 13 Bottom Quartile #92 / 93
Grand Gulf 1 MS 11 26 4 2 Bottom Quartile #93 / 93
20 DTE Energy Bottom Quartile 22 37 13 16 1 0% 100% Fermi 2 22 Fermi 2 22

DTE Energy — 1 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Fermi 2 MI 22 37 13 16 Bottom Quartile #86 / 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 →