WhichIndex

Largest utilities companies

107 utilities companies appear in the indexes we track. The 100 largest are listed.

Market caps from each exchange's listings, converted to US dollars at the same day's exchange rates, as of 2026-10-09.

Largest utilities companies by market cap
RankCompanyMarket capCountryIndexes
1NextEra Energy$173.2 billionUnited States2: S&P 500, NYSE Composite
2Southern Company$107.1 billionUnited States2: S&P 500, NYSE Composite
3Enel$98.4 billionItaly2: Euro Stoxx 50, FTSE MIB
4Duke Energy$97.6 billionUnited States2: S&P 500, NYSE Composite
5Constellation Energy$88.9 billionUnited States3: S&P 500, Nasdaq-100, Nasdaq Composite
6National Grid plc$77.1 billionUnited Kingdom1: FTSE 100
7American Electric Power$70.8 billionUnited States3: S&P 500, Nasdaq-100, Nasdaq Composite
8Engie$66.2 billionFrance2: Euro Stoxx 50, CAC 40
9Dominion Energy$57.8 billionUnited States2: S&P 500, NYSE Composite
10Sempra$55.2 billionUnited States2: S&P 500, NYSE Composite
11E.ON$54.0 billionGermany1: DAX
12Entergy$51.5 billionUnited States2: S&P 500, NYSE Composite
13RWE$49.4 billionGermany1: DAX
14Xcel Energy$48.8 billionUnited States3: S&P 500, Nasdaq-100, Nasdaq Composite
15Vistra Corp.$47.1 billionUnited States2: S&P 500, NYSE Composite
16Exelon$45.9 billionUnited States3: S&P 500, Nasdaq-100, Nasdaq Composite
17Consolidated Edison$42.9 billionUnited States2: S&P 500, NYSE Composite
18SSE plc$39.7 billionUnited Kingdom1: FTSE 100
19PG&E Corporation$38.5 billionUnited States2: S&P 500, NYSE Composite
20WEC Energy Group$36.3 billionUnited States2: S&P 500, NYSE Composite
21Public Service Enterprise Group$36.1 billionUnited States2: S&P 500, NYSE Composite
22NTPC$30.6 billionIndia1: Nifty 50
23Ameren$30.1 billionUnited States2: S&P 500, NYSE Composite
24Fortis Inc.$29.6 billionCanada2: NYSE Composite, S&P/TSX Composite
25Atmos Energy$29.1 billionUnited States2: S&P 500, NYSE Composite
26American Water Works$28.2 billionUnited States2: S&P 500, NYSE Composite
27DTE Energy$27.6 billionUnited States2: S&P 500, NYSE Composite
28CenterPoint Energy$27.2 billionUnited States2: S&P 500, NYSE Composite
29FirstEnergy$26.9 billionUnited States2: S&P 500, NYSE Composite
30PPL Corporation$26.4 billionUnited States2: S&P 500, NYSE Composite
31Eversource Energy$25.6 billionUnited States2: S&P 500, NYSE Composite
32Power Grid$24.1 billionIndia1: Nifty 50
33Fortum$23.5 billionFinland1: OMX Helsinki 25
34Hydro One Limited$23.4 billionCanada1: S&P/TSX Composite
35Edison International$22.2 billionUnited States2: S&P 500, NYSE Composite
36Energias de Portugal$22.0 billionPortugal1: PSI
37CMS Energy$21.9 billionUnited States2: S&P 500, NYSE Composite
38NiSource$20.9 billionUnited States2: S&P 500, NYSE Composite
39Terna$20.5 billionItaly1: FTSE MIB
40The Kansai Electric Power Co., Inc.$19.6 billionJapan1: Nikkei 225
41Evergy$19.5 billionUnited States2: S&P 500, Nasdaq Composite
42NRG Energy$19.2 billionUnited States2: S&P 500, NYSE Composite
43Alliant Energy$18.2 billionUnited States2: S&P 500, Nasdaq Composite
44Elia Group$15.2 billionBelgium1: BEL 20
45Emera Incorporated$15.1 billionCanada2: NYSE Composite, S&P/TSX Composite
46Origin Energy$14.6 billionAustralia1: S&P/ASX 200
47EDP Renováveis$14.3 billionSpain1: PSI
48Osaka Gas Co., Ltd.$14.3 billionJapan1: Nikkei 225
49United Utilities$14.2 billionUnited Kingdom1: FTSE 100
50Keppel Corporation$14.1 billionSingapore1: Straits Times Index
51Tokyo Gas Co., Ltd.$13.3 billionJapan1: Nikkei 225
52Chubu Electric Power Co., Inc.$13.0 billionJapan1: Nikkei 225
53Pinnacle West Capital$12.9 billionUnited States2: S&P 500, NYSE Composite
54Severn Trent$12.5 billionUnited Kingdom1: FTSE 100
55AltaGas Ltd.$12.4 billionCanada1: S&P/TSX Composite
56APA Group$10.7 billionAustralia1: S&P/ASX 200
57AES Corporation$10.7 billionUnited States2: S&P 500, NYSE Composite
58Canadian Utilities Limited$9.6 billionCanada1: S&P/TSX Composite
59Italgas$9.3 billionItaly1: FTSE MIB
60Centrica$8.9 billionUnited Kingdom1: FTSE 100
61Meridian Energy Limited$8.5 billionNew Zealand1: S&P/NZX 50
62Sembcorp Industries$8.1 billionSingapore1: Straits Times Index
63A2A$7.9 billionItaly1: FTSE MIB
64Metlen Energy & Metals$7.7 billionUnited Kingdom1: FTSE 100
65Capital Power Corporation$6.8 billionCanada1: S&P/TSX Composite
66Southwest Gas Holdings$6.6 billionUnited States2: Russell 2000, NYSE Composite
67Txnm Energy Inc$6.4 billionUnited States2: Russell 2000, NYSE Composite
68Black Hills Corp$6.1 billionUnited States2: Russell 2000, NYSE Composite
69EVN$5.9 billionAustria1: ATX
70Hera$5.7 billionItaly1: FTSE MIB
71Mercury NZ Limited$5.5 billionNew Zealand1: S&P/NZX 50
72New Jersey Resources Corp$5.4 billionUnited States2: Russell 2000, NYSE Composite
73Ormat Technologies$5.4 billionIsrael3: Russell 2000, NYSE Composite, TA-35
74Portland General Electric$5.2 billionUnited States2: Russell 2000, NYSE Composite
75Contact Energy Limited$5.2 billionNew Zealand1: S&P/NZX 50
76Tokyo Electric Power Company Holdings, I$5.1 billionJapan1: Nikkei 225
77Spire Inc$5.0 billionUnited States2: Russell 2000, NYSE Composite
78One Gas$4.9 billionUnited States2: Russell 2000, NYSE Composite
79Northwestern Energy Group$4.8 billionUnited States2: Russell 2000, Nasdaq Composite
80Brookfield Infrastructure Corp Cla$4.5 billionCanada2: Russell 2000, NYSE Composite
81AGL Energy$4.3 billionAustralia1: S&P/ASX 200
82Algonquin Power & Utilities Corp.$4.1 billionCanada2: NYSE Composite, S&P/TSX Composite
83TransAlta Corporation$3.9 billionCanada2: NYSE Composite, S&P/TSX Composite
84Otter Tail$3.8 billionUnited States2: Russell 2000, Nasdaq Composite
85Chesapeake Utilities$3.4 billionUnited States2: Russell 2000, NYSE Composite
86American States Water$3.4 billionUnited States2: Russell 2000, NYSE Composite
87Avista$3.1 billionUnited States2: Russell 2000, NYSE Composite
88California Water Service Group$2.9 billionUnited States2: Russell 2000, NYSE Composite
89Mge Energy$2.8 billionUnited States2: Russell 2000, Nasdaq Composite
90Redes Energéticas Nacionais$2.6 billionPortugal1: PSI
91Vector Limited$2.6 billionNew Zealand1: S&P/NZX 50
92H2o America$2.5 billionUnited States2: Russell 2000, Nasdaq Composite
93Northwest Natural Holding Company$2.1 billionUnited States2: Russell 2000, NYSE Composite
94Genesis Energy Limited$1.7 billionNew Zealand1: S&P/NZX 50
95Hawaiian Electric Industries$1.5 billionUnited States2: Russell 2000, NYSE Composite
96Middlesex Water$1.1 billionUnited States2: Russell 2000, Nasdaq Composite
97Superior Plus Corp.$1.0 billionCanada1: S&P/TSX Composite
98Unitil Corp$1.0 billionUnited States1: Russell 2000
99Hallador Energy$520 millionUnited States2: Russell 2000, Nasdaq Composite
100York Water$513 millionUnited States2: Russell 2000, Nasdaq Composite