Constellation Energy vs AES Corporation
Side-by-side comparison of AI visibility scores, market position, and capabilities
Baltimore largest US nuclear operator (NASDAQ: CEG) at $23.6B FY2024 revenue; 21 reactors, Three Mile Island restarted Sept 2024 for Microsoft AI data center, 24/7 carbon-free power competing with Vistra and NRG.
About
Constellation Energy Corporation is a Baltimore, Maryland-based clean energy company — publicly traded on NASDAQ (NASDAQ: CEG) as an S&P 500 Utilities component with a market capitalization of approximately $70 billion — operating the United States' largest fleet of carbon-free nuclear power plants with 21 nuclear reactors at 13 generating stations across Illinois, Pennsylvania, Maryland, New Jersey, and New York, through approximately 13,000 employees generating approximately 10% of all clean electricity in the United States. In fiscal year 2024, Constellation Energy reported revenue of $23.6 billion. Constellation was separated from Exelon Corporation in February 2022, when Exelon spun off its power generation business as an independent company while retaining the regulated utility subsidiaries (ComEd, PECO, BGE, Pepco, Delmarva, Atlantic City Electric). CEO Joe Dominguez leads Constellation's strategy of capitalizing on the AI data center electricity demand surge — nuclear power's unique combination of 24/7 carbon-free reliability makes Constellation the preferred clean power supplier for tech companies' 24/7 carbon-free electricity commitments that intermittent wind and solar cannot fulfill. Constellation's landmark achievement was the September 2024 restart of Three Mile Island Unit 1 (renamed Crane Clean Energy Center) — the reactor that operated safely for decades before closing in 2019 due to economic competition from cheap natural gas — under a 20-year power purchase agreement with Microsoft to supply the data center campus supporting Microsoft's Azure AI infrastructure in Pennsylvania.
Arlington VA global power company (NYSE: AES) at $12.28B 2024 revenue; 32 GW portfolio (50% renewable), Meta solar agreements for AI data centers, 12 GW contracted backlog competing with NextEra for corporate clean energy PPA.
About
The AES Corporation is an Arlington, Virginia-based global power company — publicly traded on the New York Stock Exchange (NYSE: AES) as an S&P 500 Fortune 500 component — generating and distributing electric power across 15 countries to more than 2.5 million customers worldwide with a generation portfolio totaling over 32 gigawatts, of which renewable energy comprises 50% of capacity. In fiscal year 2024, AES reported revenue of $12.28 billion, completed construction of 3.0 GW of renewable energy projects, and signed 6.8 GW of new contracts, including renewable power purchase agreements for AI data center load growth. AES has earned recognition as the largest global supplier of clean energy to corporations for three consecutive years (BloombergNEF). In 2025, AES signed major solar agreements with Meta for projects in Michigan, Missouri, and Illinois powering hyperscale data centers. AES announced plans to exit coal generation completely by 2025, ahead of its previous target. AES's Fluence joint venture with Siemens is a global leader in energy storage technologies. Founded in 1981 as Applied Energy Services, AES is led by President and CEO Andrés Gluski (since 2011) and employs approximately 10,500 people worldwide.
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