CONSTELLATION ENERGY GENERATION LLC

For the period ended Dec 31, 2025. Filed Feb 24, 2026.

About this filing

A company's yearly report to the SEC, with audited financial statements. It is the fullest account a company gives of its business, its finances and the risks it sees.

FY2025 · Filed Feb 24, 2026

CEG$267.76-3.0%Stored close · as of Nov 10, 2026

Extracted filing text, with the paragraph anchors used by the comparison.

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Contents

GLOSSARY OF TERMS AND ABBREVIATIONS

GLOSSARY OF TERMS AND ABBREVIATIONS
Constellation Energy Corporation and Related Entities
CEG Parent	Constellation Energy Corporation
Constellation	Constellation Energy Generation, LLC
Registrants	CEG Parent and Constellation, collectively
Antelope Valley	Antelope Valley Solar Ranch One
Calpine	Calpine Corporation
Calvert Cliffs	Calvert Cliffs nuclear generating station
Continental Wind	Continental Wind LLC
CENG	Constellation Energy Nuclear Group, LLC
CR	Constellation Renewables, LLC
Crane	Crane Clean Energy Center (formerly known as Three Mile Island Unit 1)
CRP	Constellation Renewables Partners, LLC
FitzPatrick	James A. FitzPatrick nuclear generating station
Ginna	R. E. Ginna nuclear generating station
LaSalle	LaSalle nuclear generating station
NER	NewEnergy Receivables LLC
NMP	Nine Mile Point nuclear generating station
RPG	Renewable Power Generation, LLC
STP	South Texas Project nuclear generating station
West Medway II	West Medway Generating Station II

Former Related Entities
Exelon	Exelon Corporation
ComEd	Commonwealth Edison Company
PECO	PECO Energy Company
BGE	Baltimore Gas and Electric Company

GLOSSARY OF TERMS AND ABBREVIATIONS
Other Terms and Abbreviations
ABO	Accumulated Benefit Obligation
AEP Texas	American Electric Power Texas, Inc.
AESO	Alberta Electric Systems Operator
AI	Artificial Intelligence
AOCI	Accumulated Other Comprehensive Income (Loss)
APBO	Accumulated Postretirement Benefit Obligation
ARC	Asset Retirement Cost
ARO	Asset Retirement Obligation
ASR	Accelerated Share Repurchase
Atomic Energy Act	Atomic Energy Act of 1954, as amended
Bcf	Billion cubic feet
C&I	Commercial and Industrial
CAISO	California ISO
CARFR	Credit-Adjusted, Risk-Free Rates
CBAs	Collective Bargaining Agreements
CCUS	Carbon Capture, Utilization, and Storage
CenterPoint	CenterPoint Energy Houston Electric, LLC
CERCLA	Comprehensive Environmental Response, Compensation, and Liability Act of 1980, as amended
CHIPS and Science Act	CHIPS and Science Act of 2022
Clean Air Act	Clean Air Act of 1963, as amended
Clean Energy Law	Illinois Public Act 102-0062 signed into law on September 15, 2021
Clean Water Act	Federal Water Pollution Control Amendments of 1972, as amended
CMC	Carbon Mitigation Credit
CO2	Carbon Dioxide
CODM	Chief Operating Decision Maker
CORe+	Constellation Offsite Renewables
CWIP	Construction Work In Progress
DOE	United States Department of Energy
DOJ	United States Department of Justice
DPP	Deferred Purchase Price
EEI	Edison Electric Institute
EFEC	Emissions-Free Energy Certificate
EMT	Everett Marine Terminal
EPA	United States Environmental Protection Agency
ERCOT	Electric Reliability Council of Texas
ERISA	Employee Retirement Income Security Act of 1974, as amended
EROA	Expected Rate of Return on Assets
ERM	ERM International Group Limited
ERP	Enterprise Resource Program
EV	Electric Vehicle
Exchange Act	Securities Exchange Act of 1934. as amended
Federal Power Act	Federal Power Act of 1920, as amended

GLOSSARY OF TERMS AND ABBREVIATIONS
Other Terms and Abbreviations
FERC	Federal Energy Regulatory Commission
Former ComEd Units	Braidwood, Byron, Dresden, LaSalle and Quad Cities nuclear generating units
Former PECO Units	Limerick, Peach Bottom, and Salem nuclear generating units
FRCC	Florida Reliability Coordinating Council
GAAP	Generally Accepted Accounting Principles in the United States
GDP	Gross Domestic Product
Geysers Assets	Geothermal power plant assets acquired through Calpine, including steam extraction and gathering assets
GHG	Greenhouse Gas
GW	Gigawatt
GWh	Gigawatt hour
ICC	Illinois Commerce Commission
ICE	Intercontinental Exchange
IPA	Illinois Power Agency
IRA	Inflation Reduction Act of 2022
IRS	Internal Revenue Service
ISO	Independent System Operator
ISO-NE	ISO New England Inc.
ITC	Investment Tax Credit
kWh	Kilowatt-hour
LIBOR	London Interbank Offered Rate
LLRW	Low-Level Radioactive Waste
LTIP	Long-Term Incentive Plan
MDE	Maryland Department of the Environment
MISO	Midcontinent Independent System Operator, Inc.
MMBtu	Million Btu
Moody's	Moody’s Investors Service, Inc.
MRV	Market-Related Value
MW	Megawatt
MWh	Megawatt-hour
Mystic COS	Mystic Cost of Service Agreement
N/A	Not applicable
NASDAQ	Nasdaq Stock Market, LLC
NAV	Net Asset Value
NDT	Nuclear Decommissioning Trust
NEIL	Nuclear Electric Insurance Limited
NERC	North American Electric Reliability Corporation
NGX	Natural Gas Exchange, Inc.
NJDEP	New Jersey Department of Environmental Protection
Non-Regulatory Agreement Units	Nuclear generating units or portions thereof whose decommissioning-related activities are not subject to contractual elimination under regulatory accounting
NPDES	National Pollutant Discharge Elimination System
NPNS	Normal Purchase Normal Sale scope exception
NRC	Nuclear Regulatory Commission

GLOSSARY OF TERMS AND ABBREVIATIONS
Other Terms and Abbreviations
NYISO	New York ISO
NYMEX	New York Mercantile Exchange
NYPSC	New York Public Service Commission
OBBBA	One Big Beautiful Bill Act of 2025
OCI	Other Comprehensive Income (Loss)
OIESO	Ontario Independent Electricity System Operator
OPEB	Other Postretirement Employee Benefits
PAPUC	Pennsylvania Public Utility Commission
PBO	Projected Benefit Obligation
Pension Protection Act (the Act)	Pension Protection Act of 2006
PG&E	Pacific Gas and Electric Company
PJM	PJM Interconnection, LLC
PP&E	Property, Plant, and Equipment
PPA	Power Purchase Agreement
Price-Anderson Act	Price-Anderson Nuclear Industries Indemnity Act of 1957
PRP	Potentially Responsible Parties
PSEG	Public Service Enterprise Group Incorporated
PTC	Production Tax Credit
PUCT	Public Utility Commission of Texas
PV	Photovoltaic
RCF	Revolving credit facility
RCRA	Resource Conservation and Recovery Act of 1976, as amended
REC	Renewable Energy Certificate (Credit), which is the environmental attribute associated with each megawatt hour of production from a qualified renewable energy source
Regulatory Agreement Units	Nuclear generating units or portions thereof whose decommissioning-related activities are subject to contractual elimination under regulatory accounting (includes the Former ComEd units, the Former PECO units, and STP)
RIN	Renewable Identification Number
RMP	Risk Management Policy
RNF	Operating Revenues Net of Purchased Power and Fuel Expense
RNG	Renewable Natural Gas
ROU	Right-of-use
RPS	Renewable Portfolio Standards
RTO	Regional Transmission Organization
S&P	Standard & Poor’s Ratings Services
SEC	United States Securities and Exchange Commission
SERC	SERC Reliability Corporation (formerly Southeast Electric Reliability Council)
SNF	Spent Nuclear Fuel
SOA	Society of Actuaries
SOFR	Secured Overnight Financing Rate
SPDES	State Pollutant Discharge Elimination System
SPP	Southwest Power Pool
STEM	Science, Technology, Engineering, and Mathematics

GLOSSARY OF TERMS AND ABBREVIATIONS
Other Terms and Abbreviations
STPNOC	STP Nuclear Operating Company
TEF	Texas Energy Fund
TMA	Tax Matters Agreement
TWh	Terawatt-hour
U.S. Court of Appeals for the D.C. Circuit	United States Court of Appeals for the District of Columbia Circuit
U.S. Treasury	U.S. Department of the Treasury
UEC	Unamortized Energy Contract
VIE	Variable Interest Entity
WECC	Western Electric Coordinating Council
ZEC	Zero Emission Credit

ContentsView on SEC.gov

The text of this filing, as the company filed it with the SEC, without its images or exhibits. This is not investment advice.