Business Context and Reporting Period
This Form 10-K covers the fiscal year ended December 31, 2025, for Constellation Energy Corporation (CEG Parent) and Constellation Energy Generation, LLC. Constellation is the nation's largest producer of clean energy and the largest nuclear energy company in the U.S. The filing details the company's operations prior to the closing of its acquisition of Calpine Corporation on January 7, 2026, which combined Constellation's nuclear and renewable assets with Calpine's natural gas and geothermal fleet to create the world's largest private-sector power producer.
Key Financial Metrics
| Metric | 2025 | 2024 | Change |
|---|---|---|---|
| Operating Revenues | $25,533 million | $23,568 million | +$1,965 million |
| Operating Income | $3,086 million | $4,352 million | -$1,266 million |
| Net Income (Attributable to Common Shareholders) | $2,319 million | $3,749 million | -$1,430 million |
| Adjusted Operating Earnings (Non-GAAP) | $2,944 million | $2,735 million | +$209 million |
| Diluted EPS (GAAP) | $7.40 | $11.89 | -$4.49 |
| Diluted EPS (Adjusted) | $9.39 | $8.67 | +$0.72 |
| Cash from Operating Activities | $4,237 million | ($2,464 million) | +$6,701 million |
| Long-Term Debt | $7,250 million | $7,384 million | -$134 million |
| Asset Retirement Obligations (Nuclear) | $12,908 million | $12,186 million | +$722 million |
Material Changes vs. Prior Period
- Revenue Growth: Operating revenues increased 8.3% to $25.5 billion, driven by favorable market conditions, higher capacity revenues, and increased retail load volumes. However, this was partially offset by a significant decrease in Nuclear Production Tax Credit (PTC) revenues.
- Net Income Decline: GAAP Net Income decreased by $1.43 billion primarily due to lower Nuclear PTC revenues ($1.76 billion decrease), unfavorable net unrealized losses on economic hedges, and higher net unrealized losses on equity investments.
- Adjusted Earnings Growth: Adjusted Operating Earnings increased to $2.94 billion, reflecting the company's core operational performance excluding volatile fair value adjustments and decommissioning-related activities.
- Cash Flow Improvement: Net cash provided by operating activities turned positive at $4.2 billion, a significant improvement from a $2.5 billion use of cash in 2024. This shift was largely due to an amendment to the Accounts Receivable Facility, which reclassified receivable collections from investing to operating activities.
- Decommissioning Obligations: The nuclear decommissioning Asset Retirement Obligation (ARO) increased to $12.9 billion, driven by higher escalation rates and revised cost studies, partially offset by higher discount rates.
Guidance, Outlook, and Risks
Outlook and Strategy
Management expects the acquisition of Calpine to be accretive to earnings per share in 2026. The combined company will have approximately 55 GW of capacity. Key growth drivers include expanded policy support for nuclear energy (including the One Big Beautiful Bill Act), rapid data center growth driven by AI, and continued electrification. The company plans to file applications to extend nuclear unit licenses to 80 years where policy support exists.
Capital Allocation
Capital expenditures are estimated at $5.7 billion for 2026 and $4.7 billion for 2027. Approximately 29% of 2026 capex is allocated to nuclear fuel inventory to mitigate supply chain risks related to the Russia-Ukraine conflict. The company maintains a target of investment-grade credit ratings (BBB+/Baa1) and increased its Revolving Credit Facility (RCF) capacity to $7.0 billion in anticipation of the Calpine acquisition.
Risks and Contingencies
- Regulatory and Legislative: Changes in market design (e.g., PJM reforms), potential repeal of GHG regulations, and the timing of nuclear license renewals (e.g., Conowingo, Peach Bottom) pose significant risks.
- Operational: Risks include nuclear fuel supply disruptions due to geopolitical sanctions, extreme weather events impacting generation, and cybersecurity threats.
- Acquisition Integration: The Calpine merger introduces integration challenges, potential unknown liabilities, and the risk of failing to realize anticipated synergies or accretion.
- Legal: Ongoing litigation related to the February 2021 Texas winter storm (Winter Storm Uri) remains a material contingency, though recent appellate rulings have been favorable to the company.
Investor Verification Checklist
- Calpine Acquisition Closing: Verify the final purchase price allocation, goodwill recording, and pro forma financial impact in the Q1 2026 10-Q.
- Nuclear PTC Volatility: Monitor the impact of the Nuclear Production Tax Credit phase-out thresholds on future revenue recognition, as 2025 revenues were significantly lower than 2024 due to higher market prices.
- Decommissioning Funding: Review the Nuclear Decommissioning Trust (NDT) fund performance and the adequacy of funding relative to the $12.9 billion ARO, particularly regarding the impact of interest rate changes on trust asset values.
- Regulatory Approvals: Track the status of the Crane Clean Energy Center restart (Three Mile Island Unit 1) and the Conowingo hydroelectric license renewal, as delays could impact capital deployment and revenue timelines.
- Legal Contingencies: Monitor the status of the Winter Storm Uri litigation in the Texas Supreme Court and the Oklahoma Attorney General lawsuit regarding natural gas sales.