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
31 Alliant Energy Corporation $15.61 B United States US Utilities US Utilities—Regulated Electric
32 Avangrid, Inc. $13.94 B

(Dec. 1, 2024)

 United States US Utilities US Utilities—Regulated Electric
33 Pinnacle West Capital Corporation $10.77 B United States US Utilities US Utilities—Regulated Electric
34 Essential Utilities, Inc. $10.31 B United States US Utilities US Utilities—Regulated Water
35 OGE Energy Corp. $8.96 B United States US Utilities US Utilities—Regulated Electric
36 The AES Corporation $8.20 B United States US Utilities US Utilities—Diversified
37 UGI Corporation $7.55 B United States US Utilities US Utilities—Regulated Gas
38 Clearway Energy, Inc. $6.46 B United States US Utilities US Utilities—Renewable
39 IDACORP, Inc. $6.27 B United States US Utilities US Utilities—Regulated Electric
40 Union Electric Co. $6.13 B United States US Utilities US Utilities—Regulated Electric
41 Brookfield Renewable Corporation $6.09 B United States US Utilities US Utilities—Renewable
42 Southwest Gas Holdings, Inc. $5.53 B United States US Utilities US Utilities—Regulated Gas
43 Ormat Technologies, Inc. $5.32 B United States US Utilities US Utilities—Renewable
44 Brookfield Infrastructure Corporation $5.14 B United States US Utilities US Utilities—Regulated Gas
45 New Jersey Resources Corporation $4.55 B United States US Utilities US Utilities—Regulated Gas
46 ONE Gas, Inc. $4.55 B United States US Utilities US Utilities—Regulated Gas
47 Portland General Electric Company $4.51 B United States US Utilities US Utilities—Regulated Electric
48 Spire Inc. $4.37 B United States US Utilities US Utilities—Regulated Gas
49 South Jersey Industries, Inc. $4.33 B

(Jan. 1, 2023)

 United States US Utilities US Utilities—Diversified
50 Clear Peak Energy, Inc. $4.26 B

(June 1, 2025)

 United States US Utilities US Utilities—Independent Power Producers
51 Black Hills Corporation $4.13 B United States US Utilities US Utilities—Diversified
52 PNM Resources, Inc. $3.77 B United States US Utilities US Utilities—Regulated Electric
53 ALLETE, Inc. $3.76 B United States US Utilities US Utilities—Diversified
54 Otter Tail Corporation $3.34 B United States US Utilities US Utilities—Diversified
55 MGE Energy, Inc. $3.29 B United States US Utilities US Utilities—Diversified
56 Alabama Power Co. $3.21 B

(June 1, 2022)

 United States US Utilities US Utilities—Regulated Electric
57 NorthWestern Corporation $3.19 B United States US Utilities US Utilities—Diversified
58 Avista Corporation $3.09 B United States US Utilities US Utilities—Diversified
59 American States Water Company $2.97 B United States US Utilities US Utilities—Regulated Water
60 Chesapeake Utilities Corporation $2.87 B United States US Utilities US Utilities—Regulated Gas

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

31. Alliant Energy Corporation

Company Profile: Alliant Energy Corporation
Market Cap (USD): $15.61 B
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Electric

32. Avangrid, Inc.

Company Profile: Avangrid, Inc.
Market Cap (USD): $13.94 B (Dec. 1, 2024)
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Electric

33. Pinnacle West Capital Corporation

Company Profile: Pinnacle West Capital Corporation
Market Cap (USD): $10.77 B
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Electric

34. Essential Utilities, Inc.

Company Profile: Essential Utilities, Inc.
Market Cap (USD): $10.31 B
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Water

35. OGE Energy Corp.

Company Profile: OGE Energy Corp.
Market Cap (USD): $8.96 B
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Electric

36. The AES Corporation

Company Profile: The AES Corporation
Market Cap (USD): $8.20 B
Country: United States
Sector: US Utilities
Industry: US Utilities—Diversified

37. UGI Corporation

Company Profile: UGI Corporation
Market Cap (USD): $7.55 B
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Gas

38. Clearway Energy, Inc.

Company Profile: Clearway Energy, Inc.
Market Cap (USD): $6.46 B
Country: United States
Sector: US Utilities
Industry: US Utilities—Renewable

39. IDACORP, Inc.

Company Profile: IDACORP, Inc.
Market Cap (USD): $6.27 B
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Electric

40. Union Electric Co.

Company Profile: Union Electric Co.
Market Cap (USD): $6.13 B
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Electric

41. Brookfield Renewable Corporation

Company Profile: Brookfield Renewable Corporation
Market Cap (USD): $6.09 B
Country: United States
Sector: US Utilities
Industry: US Utilities—Renewable

42. Southwest Gas Holdings, Inc.

Company Profile: Southwest Gas Holdings, Inc.
Market Cap (USD): $5.53 B
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Gas

43. Ormat Technologies, Inc.

Company Profile: Ormat Technologies, Inc.
Market Cap (USD): $5.32 B
Country: United States
Sector: US Utilities
Industry: US Utilities—Renewable

44. Brookfield Infrastructure Corporation

Company Profile: Brookfield Infrastructure Corporation
Market Cap (USD): $5.14 B
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Gas

45. New Jersey Resources Corporation

Company Profile: New Jersey Resources Corporation
Market Cap (USD): $4.55 B
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Gas

46. ONE Gas, Inc.

Company Profile: ONE Gas, Inc.
Market Cap (USD): $4.55 B
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Gas

47. Portland General Electric Company

Company Profile: Portland General Electric Company
Market Cap (USD): $4.51 B
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Electric

48. Spire Inc.

Company Profile: Spire Inc.
Market Cap (USD): $4.37 B
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Gas

49. South Jersey Industries, Inc.

Company Profile: South Jersey Industries, Inc.
Market Cap (USD): $4.33 B (Jan. 1, 2023)
Country: United States
Sector: US Utilities
Industry: US Utilities—Diversified

50. Clear Peak Energy, Inc.

Company Profile: Clear Peak Energy, Inc.
Market Cap (USD): $4.26 B (June 1, 2025)
Country: United States
Sector: US Utilities
Industry: US Utilities—Independent Power Producers

51. Black Hills Corporation

Company Profile: Black Hills Corporation
Market Cap (USD): $4.13 B
Country: United States
Sector: US Utilities
Industry: US Utilities—Diversified

52. PNM Resources, Inc.

Company Profile: PNM Resources, Inc.
Market Cap (USD): $3.77 B
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Electric

53. ALLETE, Inc.

Company Profile: ALLETE, Inc.
Market Cap (USD): $3.76 B
Country: United States
Sector: US Utilities
Industry: US Utilities—Diversified

54. Otter Tail Corporation

Company Profile: Otter Tail Corporation
Market Cap (USD): $3.34 B
Country: United States
Sector: US Utilities
Industry: US Utilities—Diversified

55. MGE Energy, Inc.

Company Profile: MGE Energy, Inc.
Market Cap (USD): $3.29 B
Country: United States
Sector: US Utilities
Industry: US Utilities—Diversified

56. Alabama Power Co.

Company Profile: Alabama Power Co.
Market Cap (USD): $3.21 B (June 1, 2022)
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Electric

57. NorthWestern Corporation

Company Profile: NorthWestern Corporation
Market Cap (USD): $3.19 B
Country: United States
Sector: US Utilities
Industry: US Utilities—Diversified

58. Avista Corporation

Company Profile: Avista Corporation
Market Cap (USD): $3.09 B
Country: United States
Sector: US Utilities
Industry: US Utilities—Diversified

59. American States Water Company

Company Profile: American States Water Company
Market Cap (USD): $2.97 B
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Water

60. Chesapeake Utilities Corporation

Company Profile: Chesapeake Utilities Corporation
Market Cap (USD): $2.87 B
Country: United States
Sector: US Utilities
Industry: US Utilities—Regulated Gas

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