Fleet Rankings

Which US nuclear operator runs the best fleet? Composite of 7 publicly observable performance metrics, aggregated by owner. Data refreshed 15.7h ago

20
Operators Ranked
93 active units total
74
Top Fleet
Constellation Energy · 21 units
20
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 76 85 61 21 81% 0% Peach Bottom 3 92 Calvert Cliffs 2 45

Constellation Energy — 21 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Peach Bottom 3 PA 92 96 88 91 Top Quartile #1 / 93
Byron 2 IL 91 83 98 91 Top Quartile #2 / 93
Limerick 2 PA 89 83 94 91 Top Quartile #3 / 93
Limerick 1 PA 88 78 94 91 Top Quartile #4 / 93
Braidwood 2 IL 87 77 94 91 Top Quartile #5 / 93
Byron 1 IL 83 71 88 91 Top Quartile #7 / 93
Calvert Cliffs 1 MD 83 69 88 91 Top Quartile #8 / 93
Dresden 2 IL 81 88 85 70 Top Quartile #10 / 93
Dresden 3 IL 78 71 94 70 Top Quartile #13 / 93
Quad Cities 1 IL 78 78 85 70 Top Quartile #14 / 93
FitzPatrick NY 75 89 88 47 Top Quartile #16 / 93
Braidwood 1 IL 74 78 98 47 Top Quartile #17 / 93
LaSalle 2 IL 74 69 81 70 Top Quartile #19 / 93
LaSalle 1 IL 73 77 94 47 Top Quartile #20 / 93
Ginna NY 70 69 94 47 Top Quartile #22 / 93
Nine Mile Point 1 NY 68 88 27 91 Top Quartile #23 / 93
Peach Bottom 2 PA 67 88 100 15 Top Quartile #24 / 93
Nine Mile Point 2 NY 54 64 83 15 Mid Quartile #34 / 93
Clinton IL 51 55 70 29 Mid Quartile #38 / 93
Quad Cities 2 IL 50 56 79 15 Mid Quartile #41 / 93
Calvert Cliffs 2 MD 45 74 60 1 Mid Quartile #55 / 93
2 Duke Energy Top Quartile 62 63 61 63 11 36% 0% Oconee 1 86 Catawba 2 41

Duke Energy — 11 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Oconee 1 SC 86 92 73 91 Top Quartile #6 / 93
Oconee 3 SC 81 69 83 91 Top Quartile #9 / 93
Brunswick 2 NC 80 78 70 91 Top Quartile #11 / 93
Catawba 1 SC 72 55 70 91 Top Quartile #21 / 93
Brunswick 1 NC 65 60 63 70 Mid Quartile #25 / 93
Oconee 2 SC 59 70 79 29 Mid Quartile #27 / 93
McGuire 1 NC 56 67 30 70 Mid Quartile #31 / 93
McGuire 2 NC 52 46 63 47 Mid Quartile #35 / 93
Harris 1 NC 48 65 63 15 Mid Quartile #47 / 93
Robinson 2 SC 47 53 18 70 Mid Quartile #50 / 93
Catawba 2 SC 41 37 57 29 Mid Quartile #60 / 93
3 Pacific Gas & Electric Top Quartile 51 50 32 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 43 70 Mid Quartile #28 / 93
Diablo Canyon 2 CA 44 42 21 70 Mid Quartile #56 / 93
4 NextEra Energy Top Quartile 49 47 50 50 7 29% 29% Point Beach 2 78 Turkey Point 3 29

NextEra Energy — 7 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Point Beach 2 WI 78 65 79 91 Top Quartile #12 / 93
Point Beach 1 WI 74 72 79 70 Top Quartile #18 / 93
Turkey Point 4 FL 56 50 48 70 Mid Quartile #30 / 93
Seabrook 1 NH 43 46 36 47 Mid Quartile #57 / 93
Saint Lucie 1 FL 34 44 43 15 Mid Quartile #70 / 93
Saint Lucie 2 FL 29 28 13 47 Bottom Quartile #80 / 93
Turkey Point 3 FL 29 28 54 6 Bottom Quartile #81 / 93
5 STP Nuclear Operating Top Quartile 48 41 54 50 2 0% 0% South Texas 1 55 South Texas 2 42

STP Nuclear Operating — 2 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
South Texas 1 TX 55 41 54 70 Mid Quartile #33 / 93
South Texas 2 TX 42 42 54 29 Mid Quartile #59 / 93
6 PSEG Nuclear Mid Quartile 46 45 25 70 3 0% 0% Salem 1 57 Hope Creek 1 36

PSEG Nuclear — 3 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Salem 1 NJ 57 59 21 91 Mid Quartile #29 / 93
Salem 2 NJ 46 51 18 70 Mid Quartile #52 / 93
Hope Creek 1 NJ 36 25 36 47 Mid Quartile #67 / 93
7 Nebraska Public Power District Mid Quartile 46 77 14 47 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 77 14 47 Mid Quartile #53 / 93
8 Arizona Public Service Mid Quartile 45 43 31 63 3 0% 33% Palo Verde 1 55 Palo Verde 2 33

Arizona Public Service — 3 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Palo Verde 1 AZ 55 59 36 70 Mid Quartile #32 / 93
Palo Verde 3 AZ 48 45 30 70 Mid Quartile #43 / 93
Palo Verde 2 AZ 33 25 27 47 Bottom Quartile #73 / 93
9 Vistra Corp. Mid Quartile 43 48 44 36 6 0% 33% Davis-Besse 62 Perry 1 28

Vistra Corp. — 6 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Davis-Besse OH 62 51 63 70 Mid Quartile #26 / 93
Comanche Peak 1 TX 50 56 67 29 Mid Quartile #39 / 93
Comanche Peak 2 TX 45 54 54 29 Mid Quartile #54 / 93
Beaver Valley 2 PA 41 54 54 15 Mid Quartile #61 / 93
Beaver Valley 1 PA 31 43 21 29 Bottom Quartile #78 / 93
Perry 1 OH 28 29 7 47 Bottom Quartile #82 / 93
10 Southern Nuclear Mid Quartile 42 39 57 31 7 14% 43% Vogtle 2 77 Hatch 1 19

Southern Nuclear — 7 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Vogtle 2 GA 77 65 73 91 Top Quartile #15 / 93
Farley 1 AL 51 49 57 47 Mid Quartile #37 / 93
Vogtle 1 GA 50 46 76 29 Mid Quartile #40 / 93
Hatch 2 GA 40 44 48 29 Mid Quartile #62 / 93
Farley 2 AL 34 50 36 15 Bottom Quartile #72 / 93
Vogtle 3 GA 25 3 70 1 Bottom Quartile #85 / 93
Hatch 1 GA 19 17 36 3 Bottom Quartile #90 / 93
11 Energy Northwest Mid Quartile 42 51 3 70 1 0% 0% Columbia Generating Station 42 Columbia Generating Station 42

Energy Northwest — 1 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Columbia Generating Station WA 42 51 3 70 Mid Quartile #58 / 93
12 Xcel Energy Mid Quartile 39 35 51 30 3 0% 33% Prairie Island 1 51 Monticello 28

Xcel Energy — 3 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Prairie Island 1 MN 51 31 76 47 Mid Quartile #36 / 93
Prairie Island 2 MN 38 41 43 29 Mid Quartile #64 / 93
Monticello MN 28 33 36 15 Bottom Quartile #83 / 93
13 Tennessee Valley Authority Mid Quartile 38 32 43 39 7 0% 43% Browns Ferry 3 49 Sequoyah 1 25

Tennessee Valley Authority — 7 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Browns Ferry 3 AL 49 35 43 70 Mid Quartile #42 / 93
Browns Ferry 2 AL 48 66 30 47 Mid Quartile #46 / 93
Browns Ferry 1 AL 47 43 70 29 Mid Quartile #48 / 93
Watts Bar 1 TN 35 14 43 47 Mid Quartile #69 / 93
Sequoyah 2 TN 33 21 30 47 Bottom Quartile #74 / 93
Watts Bar 2 TN 30 25 60 6 Bottom Quartile #79 / 93
Sequoyah 1 TN 25 22 24 29 Bottom Quartile #84 / 93
14 Dominion Energy Mid Quartile 37 30 25 55 7 0% 43% Millstone 2 48 Summer 12

Dominion Energy — 7 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Millstone 2 CT 48 26 48 70 Mid Quartile #44 / 93
North Anna 2 VA 47 28 43 70 Mid Quartile #49 / 93
Surry 2 VA 47 38 11 91 Mid Quartile #51 / 93
Millstone 3 CT 38 28 15 70 Mid Quartile #63 / 93
North Anna 1 VA 34 37 36 29 Bottom Quartile #71 / 93
Surry 1 VA 31 41 5 47 Bottom Quartile #77 / 93
Summer SC 12 11 18 6 Bottom Quartile #91 / 93
15 Talen Energy Mid Quartile 35 52 25 27 2 0% 50% Susquehanna 2 38 Susquehanna 1 32

Talen Energy — 2 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Susquehanna 2 PA 38 64 2 47 Mid Quartile #65 / 93
Susquehanna 1 PA 32 41 48 6 Bottom Quartile #75 / 93
16 Wolf Creek Nuclear Bottom Quartile 32 35 13 47 1 0% 100% Wolf Creek 1 32 Wolf Creek 1 32

Wolf Creek Nuclear — 1 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Wolf Creek 1 KS 32 35 13 47 Bottom Quartile #76 / 93
17 Indiana Michigan Power Bottom Quartile 29 33 24 31 2 0% 50% D.C. Cook 1 36 D.C. Cook 2 22

Indiana Michigan Power — 2 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
D.C. Cook 1 MI 36 38 24 47 Mid Quartile #66 / 93
D.C. Cook 2 MI 22 29 24 15 Bottom Quartile #86 / 93
18 Entergy Bottom Quartile 25 29 14 31 5 0% 60% Arkansas Nuclear 2 48 Grand Gulf 1 11

Entergy — 5 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Arkansas Nuclear 2 AR 48 43 10 91 Mid Quartile #45 / 93
Arkansas Nuclear 1 AR 35 27 48 29 Mid Quartile #68 / 93
River Bend 1 LA 19 34 10 15 Bottom Quartile #89 / 93
Waterford 3 LA 11 18 1 15 Bottom Quartile #92 / 93
Grand Gulf 1 MS 11 26 3 3 Bottom Quartile #93 / 93
19 Ameren Missouri Bottom Quartile 21 10 6 47 1 0% 100% Callaway 21 Callaway 21

Ameren Missouri — 1 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Callaway MO 21 10 6 47 Bottom Quartile #87 / 93
20 DTE Energy Bottom Quartile 20 37 7 15 1 0% 100% Fermi 2 20 Fermi 2 20

DTE Energy — 1 active units

Unit State Composite Reliability Efficiency Discipline Quartile Fleet Rank
Fermi 2 MI 20 37 7 15 Bottom Quartile #88 / 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 →