The Largest Utilities Companies by Market Cap in March 2026

NextEra Energy, Iberdrola, and Constellation Energy lead the utilities sector.

By Lyle Daly – Updated Jan 28, 2026 at 6:08 PM EST | Fact-checked by Frank Bass

Key Points

NextEra Energy leads as the world's highest valued utility, outpacing Iberdrola and Constellation Energy.
Iberdrola, a key player in renewable energy, maintains a strong European market presence.
Constellation Energy has secured long-term power agreements with major corporations like Meta.

NextEra Energy (NEE +0.26%) is the most valuable utility company in the world, far ahead of Iberdrola (IBDSF -1.92%) and Constellation Energy (CEG +2.13%). Electrical utility companies dominate the top of the market, and there's a mix of U.S. and international companies represented.

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Utility towers with lines going from one to the next. — Image source: Getty Images.

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Ticker Information Table
Name and ticker	Market cap	Current price	Industry
NextEra Energy (NYSE:NEE)	$190.4 billion	$91.40	Electric Utilities
Iberdrola (OTC:IBDSF)	$143.5 billion	$21.75	Electric Utilities
Constellation Energy (NASDAQ:CEG)	$109.1 billion	$301.76	Electric Utilities
Enel SpA (OTC:ENLAY)	$106.2 billion	$10.46	Electric Utilities
Southern Company (NYSE:SO)	$107.0 billion	$95.55	Electric Utilities
Duke Energy (NYSE:DUK)	$101.1 billion	$130.02	Electric Utilities
National Grid Plc (NYSE:NGG)	$81.4 billion	$81.86	Multi-Utilities
Engie (OTC:ENGQF)	$78.2 billion	$30.82	Multi-Utilities
American Electric Power (NASDAQ:AEP)	$70.4 billion	$130.20	Electric Utilities

Data as of Mar 29, 2026. Showing 9 of 9 tickers.

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NYSE: NEE

NextEra Energy

Today's Change

(0.26%) $0.24

Current Price

$91.40

Key Data Points

Market Cap

$190B

Day's Range

$90.70 - $92.22

52wk Range

$61.72 - $95.91

Volume

7.7M

Avg Vol

9.7M

Gross Margin

36.20%

Dividend Yield

2.54%

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Market cap: $192.91 billion (as of March 3)
Revenue (TTM): $27.4 billion
Gross profit (TTM): $17.1 billion
Five-year annualized return: 4.18%
Year founded: 1925 (Florida Power & Light), 1984 (FPL Group)

TTM = trailing 12 months.

NextEra Energy is a leading utility and renewable energy company. It has multiple subsidiaries, the largest of which is Florida Power & Light, the largest electrical utility company in the U.S.

It supplies power to approximately 12 million people across Florida. Another subsidiary, NextEra Energy Resources, is one of the country's largest generators of renewable energy, including wind energy and solar energy.

2. Iberdrola

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OTC: IBDSF

Iberdrola

Today's Change

(-1.92%) $-0.42

Current Price

$21.75

Key Data Points

Market Cap

$144B

Day's Range

$21.75 - $22.59

52wk Range

$15.50 - $24.50

Volume

7.1K

Avg Vol

29K

Gross Margin

25.40%

Dividend Yield

3.56%

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Market cap: $161.33 billion (as of March 3)
Revenue (TTM): $52.8 billion*
Gross profit (TTM): $28.1 billion*
Five-year annualized return: 13.50%
Year founded: 1907 (Hidroelectrica Espanola), 1944 (Iberduero), 1992 (merger of Hidroelectrica Espanola and Iberduero)

*Converted from euros.

Iberdrola is a Spanish electrical utility company with subsidiaries worldwide, including in the U.S., the U.K., and Brazil. It serves more than 36 million customers worldwide and is the leading European electrical utilities company by market cap.

This company first committed to using renewable energy in 2001. As of early 2026, it has led the European market for three consecutive years in long-term renewable energy purchase agreements.

3. Constellation Energy

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NASDAQ: CEG

Constellation Energy

Today's Change

(2.23%) $6.57

Current Price

$301.76

Key Data Points

Market Cap

$109B

Day's Range

$296.67 - $306.89

52wk Range

$161.35 - $412.70

Volume

99K

Avg Vol

3.6M

Gross Margin

17.35%

Dividend Yield

0.53%

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Market cap: $117.60 billion (as of March 3)
Revenue (TTM): $25.5 billion
Gross profit (TTM): $4.7 billion
Year founded: 2022

Constellation Energy is an electricity and natural gas company with facilities for solar, wind, nuclear, and hydropower generation. Based in Baltimore, Md., it serves residential, business, and public sector customers.

In June 2025, Meta Platforms (META -3.91%) signed a 20-year nuclear power agreement with Constellation Energy. Starting in 2027, Meta will purchase power from a Constellation Energy center in Illinois that was previously at risk of closure. Microsoft (MSFT -2.44%) signed its own 20-year agreement with Constellation in 2024 to buy power from the Crane Clean Energy Center (formerly known as Unit 1 of Three Mile Island) in Pennsylvania.

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OTC: ENLAY

Enel SpA

Today's Change

(-0.76%) $-0.08

Current Price

$10.46

Key Data Points

Market Cap

$106B

Day's Range

$10.42 - $10.58

52wk Range

$7.37 - $12.13

Volume

405K

Avg Vol

457K

Gross Margin

17.59%

Dividend Yield

5.42%

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Market cap: $111.13 billion (as of March 3)
Revenue (TTM): $78.4 billion*
Gross profit (TTM): $34.8 billion*
Five-year annualized return: 4.31%
Year founded: 1962

*Converted from euros.

Enel SpA (ENLAY -0.76%) is an Italian energy company that distributes electricity and natural gas. It operates in 43 countries, has more than 1,000 subsidiaries, and connects more than 70 million users to its grids.

This company produces electricity from a number of renewable and non-renewable energy sources. These include solar, wind, hydroelectric, geothermal, thermal, and nuclear energy.

5. Southern Company

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NYSE: SO

Southern Company

Today's Change

(0.14%) $0.13

Current Price

$95.55

Key Data Points

Market Cap

$107B

Day's Range

$95.01 - $96.56

52wk Range

$83.09 - $100.83

Volume

6.1M

Avg Vol

Gross Margin

29.91%

Dividend Yield

3.10%

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Market cap: $108.35 billion (as of March 3)
Revenue (TTM): $29.6 billion
Gross profit (TTM): $14.3 billion
Five-year annualized return: 10.95%
Year founded: 1945

Southern Company (SO +0.13%) is a gas and electric company that serves 9 million customers across the southern U.S. Along with its subsidiaries, it owns or operates 55 facilities in 15 states.

Utilities companies often pay out generous dividends, and Southern Company is no exception. It has a high dividend yield and has raised its dividend for more than 20 consecutive years.

6. Duke Energy

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NYSE: DUK

Duke Energy

Today's Change

(0.49%) $0.64

Current Price

$130.02

Key Data Points

Market Cap

$101B

Day's Range

$129.12 - $131.21

52wk Range

$111.22 - $134.49

Volume

153K

Avg Vol

4.5M

Gross Margin

31.56%

Dividend Yield

3.26%

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NYSE: NGG

National Grid Plc

Today's Change

(-0.66%) $-0.54

Current Price

$81.86

Key Data Points

Market Cap

$81B

Day's Range

$81.59 - $82.66

52wk Range

$62.13 - $94.64

Volume

48K

Avg Vol

1.1M

Gross Margin

29.42%

Dividend Yield

3.81%

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Market cap: $90.22 billion (as of March 3)
Revenue (TTM): $23.3 billion*
Gross profit (TTM): $19.0 billion*
Five-year annualized return: 10.11%
Year founded: 1990

*Converted from British pounds.

National Grid (NGG -0.66%) is a London-based utility that handles the transmission and distribution of electricity and gas. It primarily operates in the U.K., where it distributes electricity to 8 million customers across a 21,351-square-mile service area.

This company also has a presence in the U.S. It owns and operates electricity distribution networks, electricity transmission facilities, and gas distribution networks around the northeastern U.S.

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8. China Yangtze Power

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Market cap: $90.08 billion (as of March 3)
Revenue (TTM): $12.2 billion*
Gross profit (TTM): $7.3 billion*
Five-year annualized return: 6.13%
Year founded: 2002

*Converted from Chinese yuan.

China Yangtze Power, headquartered in Beijing, is a largely state-owned utility company specializing in hydroelectric power generation. It owns all the power-generation assets of six hydropower stations along the Yangtze River and manages the 22.5-gigawatt Three Gorges Dam, the world's largest hydropower plant.

9. Engie

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OTC: ENGQF

Engie

Today's Change

(-0.18%) $-0.06

Current Price

$30.82

Key Data Points

Market Cap

$78B

Day's Range

$30.15 - $31.46

52wk Range

$18.20 - $35.36

Volume

2.3K

Avg Vol

6.2K

Gross Margin

12.28%

Dividend Yield

5.47%

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Market cap: $82.40 billion (as of March 3)
Revenue (TTM): $86.3 billion*
Gross profit (TTM): $30.1 billion*
Five-year annualized return: 18.65%
Year founded: 1858 (Suez Company), 1946 (Gaz de France), 2008 (merger of Gaz de France and Suez Company)

Converted from euros.

Engie (ENGQF -0.18%) is one of the largest French electrical utility companies. It has several business segments, including renewable energy, thermal energy, nuclear power, electricity generation and distribution, and natural gas.

10. American Electric Power Company

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NASDAQ: AEP

American Electric Power

Today's Change

(1.05%) $1.35

Current Price

$130.20

Key Data Points

Market Cap

$70B

Day's Range

$128.36 - $131.51

52wk Range

$97.46 - $135.00

Volume

106K

Avg Vol

3.7M

Gross Margin

32.49%

Dividend Yield

2.89%

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Market cap: $71.35 billion (as of March 3)
Revenue (TTM): $21.9 billion
Gross profit (TTM): $13.3 billion
Five-year annualized return: 11.76%
Year founded: 1906

American Electric Power Company (AEP +0.97%) is an electrical utility company serving approximately 5.6 million customers across 11 states. It boasts the largest electricity transmission network in the country, at 40,000 miles.

Like other major utility companies, American Electric Power Company is prioritizing clean energy. It's investing $8.6 billion in renewable energy through 2027 and aiming to grow its renewable generation portfolio to 50% by 2030.

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The Largest Utilities Companies by Market Cap in March 2026

NextEra Energy, Iberdrola, and Constellation Energy lead the utilities sector.

Key Points

Key Data Points

2. Iberdrola

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3. Constellation Energy

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5. Southern Company

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6. Duke Energy

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8. China Yangtze Power

9. Engie

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10. American Electric Power Company

Key Data Points

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Largest companies by market cap in the utilities sector

1. NextEra Energy

2. Iberdrola

3. Constellation Energy

4. Enel SpA

8. China Yangtze Power

9. Engie

Utilities sector takeaways for investors

Related investing topics

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5. Southern Company

6. Duke Energy

7. National Grid

10. American Electric Power Company

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