CONSTELLATION ENERGY GENERATION LLC

Note 14 — Commitments and Contingencies

14. Commitments and Contingencies

Commitments

Commercial Commitments. Commercial commitments as of September 30, 2025, representing commitments potentially triggered by future events, were as follows:

(a)Surety bonds — Guarantees issued related to contract and commercial agreements, excluding bid bonds.

Environmental Remediation Matters

General. Our operations have in the past, and may in the future, require substantial expenditures to comply with environmental laws. Additionally, under Federal and state environmental laws, we are generally liable for the costs of remediating environmental contamination of property now or formerly owned by us and of property contaminated by hazardous substances generated by us. We own or lease several real estate parcels, including parcels on which our operations or the operations of others may have resulted in contamination by substances that are considered hazardous under environmental laws. In addition, we are currently involved in proceedings relating to sites where hazardous substances have been deposited and may be subject to additional proceedings in the future. Unless otherwise disclosed, we cannot reasonably estimate whether we will incur significant liabilities for additional investigation and remediation costs at these or additional sites identified by us, environmental agencies, or others. Additional costs could have a material, unfavorable impact on our consolidated financial statements.

As of September 30, 2025 and December 31, 2024, we had accrued undiscounted amounts for environmental liabilities of $10 million and $60 million, respectively, in Accounts payable and accrued expenses and $163 million and $169 million, respectively, in Other deferred credits and other liabilities in the Consolidated Balance Sheets. See Note 18 — Commitments and Contingencies of our 2024 Form 10-K for additional information on environmental remediation matters. As of September 30, 2025, and through the date of filing, there have been no material changes in amounts recognized for the matters discussed in our 2024 Form 10-K.

Litigation

We are involved in various litigation matters that are being defended and handled in the ordinary course of business. The assessment of whether a loss is probable or reasonably possible, and whether the loss or a range of loss is estimable, often involves a series of complex judgments about future events. We maintain accruals for such losses that are probable of being incurred and subject to reasonable estimation. Management is sometimes unable to estimate an amount or range of reasonably possible loss, particularly where (1) the damages sought are indeterminate, (2) the proceedings are in the early stages, or (3) the matters involve novel or unsettled legal theories. In such cases, there is considerable uncertainty regarding the timing or ultimate resolution of such matters, including a possible eventual loss.

See Note 18 — Commitments and Contingencies of our 2024 Form 10-K for additional information on litigation matters. As of September 30, 2025, and through the date of filing, there have been no material changes in amounts recognized for the matters discussed in our 2024 Form 10-K.