Here are the 10-K annual reports from Constellation Energy (CEG) in our archive since June 2025, newest first, and each one links through to the document itself with the summary and the scores our analysis gives it.
A 10-K covers the audited annual report, with the full financial statements, so if you follow CEG and want that one kind of document rather than the whole filing history, this is the page to keep. The company's other filings, of every form, are on the full CEG filings page.
Constellation Energy Corporation files its annual report describing a large, primarily emissions‑free generation fleet and a transformative acquisition of Calpine Corporation completed on January 7, 2026.
Before the deal, Constellation owned 31,676 MW of capacity as of December 31, 2025, including about 22 GW of nuclear generation that produced 183 TWh of zero‑emissions electricity in 2025. Nuclear power supplied 68% of its total electric supply that year, supported by high fleet capacity factors near 95%.
The Calpine acquisition adds roughly 23 GW of natural gas and geothermal generation, about 62 TWh of additional retail load, and roughly 2,500 employees, creating what the company describes as the world’s largest private‑sector power producer with 55 GW of capacity. The report outlines growth opportunities from data centers, electrification, U.S. manufacturing onshoring, supportive nuclear policy, and state incentives for new dispatchable generation such as Texas’s TEF and Maryland’s Next Generation Energy Act.