United States

Top 110 largest US Companies in the Utilities sector by Market Cap

This is the list of the largest public listed companies in the Utilities sector from the United States by market capitalization with links to their reference stock and industry.

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Top Utilities Companies from the United States as of Jul. 01, 2025

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Rank Company Market Cap (USD) Country Sector Industry
61 California Water Service Group $2.73 B United States US Utilities US Utilities—Regulated Water
62 Hawaiian Electric Industries, Inc. $1.89 B United States US Utilities US Utilities—Regulated Electric
63 SJW Group $1.88 B United States US Utilities US Utilities—Regulated Water
64 Ameren Illinois Company $1.67 B United States US Utilities US Utilities—Regulated Electric
65 Northwest Natural Holding Company $1.66 B United States US Utilities US Utilities—Regulated Gas
66 Suburban Propane Partners, L.P. $1.19 B United States US Utilities US Utilities—Regulated Gas
67 New Fortress Energy Inc. $1.12 B United States US Utilities US Utilities—Regulated Gas
68 Middlesex Water Company $995.8 M United States US Utilities US Utilities—Regulated Water
69 NextEra Energy Partners, LP $985.9 M United States US Utilities US Utilities—Renewable
70 Unitil Corporation $854.0 M United States US Utilities US Utilities—Diversified
71 Genie Energy Ltd. $672.2 M United States US Utilities US Utilities—Regulated Electric
72 The York Water Company $465.7 M United States US Utilities US Utilities—Regulated Water
73 Vision Hydrogen Corp $463.1 M

(Jan. 1, 2023)

 United States US Utilities US Utilities—Renewable
74 Spark Energy, Inc. $404.5 M

(Sept. 1, 2021)

 United States US Utilities US Utilities—Regulated Electric
75 Montauk Renewables, Inc. $386.0 M United States US Utilities US Utilities—Diversified
76 Artesian Resources Corporation $348.3 M United States US Utilities US Utilities—Regulated Water
77 Interstate Power & Light Co $334.0 M

(Dec. 1, 2021)

 United States US Utilities US Utilities—Regulated Electric
78 Vidler Water Resources, Inc. $288.2 M

(May 1, 2022)

 United States US Utilities US Utilities—Regulated Water
79 Global Water Resources, Inc. $278.9 M United States US Utilities US Utilities—Regulated Water
80 Pure Cycle Corporation $267.0 M United States US Utilities US Utilities—Regulated Water
81 Cadiz Inc. $259.5 M United States US Utilities US Utilities—Regulated Water
82 RGC Resources, Inc. $232.9 M United States US Utilities US Utilities—Regulated Gas
83 Connecticut Light & Power Co. (The) $190.1 M United States US Utilities US Utilities—Regulated Electric
84 Massachusetts Electric Co. $141.4 M United States US Utilities US Utilities—Regulated Electric
85 Atlantic Power Corporation $91.8 M

(June 1, 2023)

 United States US Utilities US Utilities—Independent Power Producers
86 Corning Natural Gas Holding Corp $76.2 M

(July 1, 2022)

 United States US Utilities US Utilities—Regulated Gas
87 Torrington Water Co. $66.5 M

(Oct. 1, 2022)

 United States US Utilities US Utilities—Regulated Water
88 Empire Diversified Energy, Inc. $8.5 M United States US Utilities US Utilities—Regulated Water
89 Advent Technologies Holdings, Inc. $5.4 M United States US Utilities US Utilities—Renewable
90 NSTAR Electric Co. $15,600 United States US Utilities US Utilities—Regulated Electric

Top Utilities Companies from the United States as of Jul. 01, 2025

61. California Water Service Group

Company Profile: California Water Service Group
Market Cap (USD): $2.73 B
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Water

62. Hawaiian Electric Industries, Inc.

Company Profile: Hawaiian Electric Industries, Inc.
Market Cap (USD): $1.89 B
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Electric

63. SJW Group

Company Profile: SJW Group
Market Cap (USD): $1.88 B
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Water

64. Ameren Illinois Company

Company Profile: Ameren Illinois Company
Market Cap (USD): $1.67 B
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Electric

65. Northwest Natural Holding Company

Company Profile: Northwest Natural Holding Company
Market Cap (USD): $1.66 B
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Gas

66. Suburban Propane Partners, L.P.

Company Profile: Suburban Propane Partners, L.P.
Market Cap (USD): $1.19 B
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Gas

67. New Fortress Energy Inc.

Company Profile: New Fortress Energy Inc.
Market Cap (USD): $1.12 B
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Gas

68. Middlesex Water Company

Company Profile: Middlesex Water Company
Market Cap (USD): $995.8 M
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Water

69. NextEra Energy Partners, LP

Company Profile: NextEra Energy Partners, LP
Market Cap (USD): $985.9 M
Country: United States
Sector: US Utilities
Industry: US Utilities—Renewable

70. Unitil Corporation

Company Profile: Unitil Corporation
Market Cap (USD): $854.0 M
Country: United States
Sector: US Utilities
Industry: US Utilities—Diversified

71. Genie Energy Ltd.

Company Profile: Genie Energy Ltd.
Market Cap (USD): $672.2 M
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Electric

72. The York Water Company

Company Profile: The York Water Company
Market Cap (USD): $465.7 M
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Water

73. Vision Hydrogen Corp

Company Profile: Vision Hydrogen Corp
Market Cap (USD): $463.1 M (Jan. 1, 2023)
Country: United States
Sector: US Utilities
Industry: US Utilities—Renewable

74. Spark Energy, Inc.

Company Profile: Spark Energy, Inc.
Market Cap (USD): $404.5 M (Sept. 1, 2021)
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Electric

75. Montauk Renewables, Inc.

Company Profile: Montauk Renewables, Inc.
Market Cap (USD): $386.0 M
Country: United States
Sector: US Utilities
Industry: US Utilities—Diversified

76. Artesian Resources Corporation

Company Profile: Artesian Resources Corporation
Market Cap (USD): $348.3 M
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Water

77. Interstate Power & Light Co

Company Profile: Interstate Power & Light Co
Market Cap (USD): $334.0 M (Dec. 1, 2021)
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Electric

78. Vidler Water Resources, Inc.

Company Profile: Vidler Water Resources, Inc.
Market Cap (USD): $288.2 M (May 1, 2022)
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Water

79. Global Water Resources, Inc.

Company Profile: Global Water Resources, Inc.
Market Cap (USD): $278.9 M
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Water

80. Pure Cycle Corporation

Company Profile: Pure Cycle Corporation
Market Cap (USD): $267.0 M
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Water

81. Cadiz Inc.

Company Profile: Cadiz Inc.
Market Cap (USD): $259.5 M
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Water

82. RGC Resources, Inc.

Company Profile: RGC Resources, Inc.
Market Cap (USD): $232.9 M
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Gas

83. Connecticut Light & Power Co. (The)

Company Profile: Connecticut Light & Power Co. (The)
Market Cap (USD): $190.1 M
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Electric

84. Massachusetts Electric Co.

Company Profile: Massachusetts Electric Co.
Market Cap (USD): $141.4 M
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Electric

85. Atlantic Power Corporation

Company Profile: Atlantic Power Corporation
Market Cap (USD): $91.8 M (June 1, 2023)
Country: United States
Sector: US Utilities
Industry: US Utilities—Independent Power Producers

86. Corning Natural Gas Holding Corp

Company Profile: Corning Natural Gas Holding Corp
Market Cap (USD): $76.2 M (July 1, 2022)
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Gas

87. Torrington Water Co.

Company Profile: Torrington Water Co.
Market Cap (USD): $66.5 M (Oct. 1, 2022)
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Water

88. Empire Diversified Energy, Inc.

Company Profile: Empire Diversified Energy, Inc.
Market Cap (USD): $8.5 M
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Water

89. Advent Technologies Holdings, Inc.

Company Profile: Advent Technologies Holdings, Inc.
Market Cap (USD): $5.4 M
Country: United States
Sector: US Utilities
Industry: US Utilities—Renewable

90. NSTAR Electric Co.

Company Profile: NSTAR Electric Co.
Market Cap (USD): $15,600
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Electric

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