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The Dynamic Dozen: The 12 Largest Public Utilities in the U.S.

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Data in this visualization comes from the 2024 Annual Utility Decarbonization Report

Dynamic Dozen: The 12 Largest Public Utilities in the U.S.

Public utilities are community-owned, non-profit organizations that supply electricity to local customers. Funded primarily through taxes and service revenues, public utilities are driven by a commitment to serve the public interest rather than generate profits.

In partnership with the National Public Utilities Council, we present the 2024 edition of our Annual Utility Decarbonization Index. The index uses the latest available data from company reports to track the decarbonization progress of the 47 largest investor-owned utilities (IOUs) in the United States.

And for the first time this year, the Index also includes a ranking of the 20 largest public utilities in the U.S. and which ones have the cleanest fuel mixes. So which public utilities contribute the most to the U.S. power grid?

The Top 12 Largest American Public Utilities

The two largest public utilities contributed nearly 30 million MWh each to the nation’s grid in 2022.

CompanyState2022 Total Owned Electricity Generation (MWh)
New York Power AuthorityNew York29,973,621
Salt River ProjectArizona28,963,126
CPS EnergyTexas25,946,058
Los Angeles Department of Water & PowerCalifornia19,846,221
Santee Cooper (South Carolina Public Service Authority)South Carolina18,984,737
Lower Colorado River AuthorityTexas14,860,017
Nebraska Public Power DistrictNebraska14,649,116
MEAG PowerGeorgia10,818,841
JEAFlorida10,696,842
Grant County, Public Utility District No. 2Washington10,278,983
Energy NorthwestWashington10,139,460
Omaha Public Power DistrictNebraska9,335,877

The country’s largest public utility, the New York Power Authority, was founded in 1931 by Governor Franklin D. Roosevelt before becoming President and today operates primarily on hydropower.

The runner-up for the highest-producing public utility is the Salt River Project in Arizona. It was founded in 1903 and provides nearly all of the Phoenix metropolitan area with electricity from a variety of sources.

Rounding off the top 10 is the Washington state-based Grant County PUD. The utility was founded in 1938 and today generates 100% of its electricity from hydropower.

Overall, public power accounts for 59% of the total number of utilities operating in the U.S. and provides electricity to two of the largest cities in the country, New York and Los Angeles. Many of the largest public utilities have operated for generations.

Download the 2024 Annual Utility Decarbonization Report

In 2022, 49% of the electricity generated by the top 20 public utilities came from carbon-free sources. For investor-owned utilities, it was 42%Download the report to see the rest of the largest public utilities.

In addition to the public utilities, there’s much more to explore in the 2024 report, including:

  • Inflation Reduction Act impacts
  • Market trends for renewables
  • Year-to-year progressions
  • Fuel mix rankings for the largest public utilities
  • Gas utility emissions rankings 

Download the 2024 NPUC Annual Utility Decarbonization Report to find out everything you need to know about the clean energy transition in the U.S. power sector.

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Energy

Visualized: Offshore Wind Installations by Region (2023–2033)

This streamgraph shows projected offshore wind capacity by region according to The Global Wind Energy Council.

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The preview image for a streamgraph showing projected offshore wind capacity by region according to The Global Wind Energy Council.

Visualized: Offshore Wind Installations by Region (2023–2033)

In order to meet the 1.5°C trajectory outlined in the Paris Agreement, the world will need 380 GW of offshore cumulative wind capacity by 2030, expanding to 2,000 GW by 2050. But can it be achieved?

The Global Wind Energy Council (GWEC) projects the upcoming offshore wind installations for each region in their Global Offshore Wind Report 2024.

This streamgraph, created in partnership with the National Public Utilities Council, shows the offshore wind installations of each region from 2023–2033, as projected by GWEC.

The Future Projections

The GWEC says that annual offshore wind installations will move from 10.9 GW in 2023 to 66.0 GW by 2033. The growth will elevate offshore wind’s share of new wind power installations from today’s 9% to at least 25%.

In 2033, Europe and China are expected to lead, with 43% and 30% of global installations, respectively. The U.S., despite its ambitious goals, will contribute just 8% of new capacity in the same year.

Here is a regional breakdown of projected future offshore wind installations in GW.

YearEuropeChinaAsia PacificNorth AmericaOther
20233.86.30.8--
20243.7121.10.9-
20255.6151.71-
20268.8152.92.6-
20279.4153.12.6-
202810155.42.4-
202917.2165.82.6-
203022.7167.13.10.4
203127.9188.54.51
203228.21895.51
203328.22010.561.5

Asia Pacific excludes China, Installation estimates in GW

California leads the U.S. efforts, targeting 25.0 GW in cumulative installations by 2045, followed by New Jersey at 11.0 GW. Despite its smaller population, Maryland aims to nearly match New York’s 9.0 GW with a target of 8.5 GW.

The U.S. has already taken strides, bringing online its first utility-scale project, Vineyard Wind 1, which added 0.8 GW to the grid.

With over 25 GW in various stages of development, the Biden administration’s goal is 30 GW by 2030, and has aspirations for 110 GW by 2050. The Inflation Reduction Act, passed under the same administration, previously allocated $392.5 billion in clean energy and climate spending.

The Economic Benefits of Offshore Wind

The American Clean Power Association (ACP) projects that the high scenario of an installation rate of 3 GW per year, with 60% domestic content, could generate $25.0 billion annually and support over 83,000 jobs by 2030.

Recent area lease auctions, such as those in the New York Bight and Carolina Long Bay, have fetched record-breaking bids totalling over $4.3 billion.

Decarbonization requires sustained effort, but with strategic investments and a commitment to innovation, offshore wind could be the wind beneath the wings of a sustainable energy future.

Learn how the National Public Utilities Council is working toward the future of sustainable electricity.

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Energy

Ranked: The Largest Power Outages in the U.S. (2013–2023)

Severe weather caused all ten of the largest U.S. power outages in the past decade, highlighting the importance of grid resiliency.

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the preview image for a polar bar chart that ranks the top ten power outages in the U.S. between 2013 and 2023, ordered by the number of customers affected.

Ranked: The Largest Power Outages in the U.S. (2013–2023)

Power outages—whether due to operational failures, extreme weather, vandalism, or fuel shortages—can have far-reaching impacts on both customers and utility companies.

Created in partnership with The National Public Utilities Council, this graphic shows the 10 largest power outages in the U.S. from the last decade, using data from the U.S. Department of Energy (DOE). 

A Decade Of Power Disruptions In Review

The U.S. DOE defines a power outage as an event in which electric service is lost to more than 50,000 customers for one hour or more. 

Between 2013 and 2023, all 10 of the largest U.S. outages—ranked by the number of customers affected—have been due to severe weather events. Hurricanes and winter storms, specifically, have caused eight of the 10 outages. 

YearNumber of Customers AffectedEventArea Affected
20173,500,000Hurricane IrmaFlorida
20212,000,000Winter stormTexas
20181,458,000Hurricane FlorenceNorth & South Carolina
20161,200,000Hurricane MatthewFlorida
20201,188,000Tropical Storm IsaiasNew England
20171,077,000Hurricane HarveyTexas
2019972,000WildfiresCalifornia
2013881,000Winter stormTexas
2023730,000Winter stormNew England
2014715,000Winter stormPennsylvania

Hurricane Irma tops this list by leaving 3.5 million Floridians without power in 2017. Irma was a Category 5 hurricane that impacted the Southeastern state and several island nations, leading to more than $50 billion in damages in Florida alone.

While Florida experienced the largest outage between 2013 and 2023, Texas has the most events in the top 10 list. These were caused by a winter storm in 2021, Hurricane Harvey in 2017, and another winter storm in 2013. 

Investing in a Resilient Grid

The causes of the U.S.’s largest outage events highlight the vulnerability of its transmission infrastructure to extreme weather. 

As of 2023, 70% of U.S. transmission lines were over 25 years old. This makes them more susceptible to power outages, cyber-attacks, and sparking wildfires. 

It is also relevant to note that extreme weather events are increasing in both frequency and intensity due to climate change. Addressing infrastructure vulnerability, therefore, may be a critical aspect of maintaining reliable power in the decades to come. 

Learn how the National Public Utilities Council is working toward the future of sustainable electricity.

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