Cybersecurity Risk Management and Strategy Disclosure	12 Months Ended
Dec. 31, 2024
Cybersecurity Risk Management, Strategy, and Governance [Line Items]
Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]	Our generating facilities are part of the United States’ energy infrastructure system and we face a myriad of cybersecurity threats. As such, cybersecurity is an area of continuous focus and we maintain a comprehensive cybersecurity risk management program with processes in place to assess, identify and manage cybersecurity risks. Our management and oversight of direct and indirect cybersecurity risks and our response to any cybersecurity incident is an integral part of our business. We have a long-standing focus on cybersecurity risks and compliance with applicable safety protocols. Our primary cybersecurity focus areas are plant infrastructure, data privacy, and outsourced services. Within these areas, we maintain multi-faceted, layered security programs designed to protect and preserve the confidentiality, integrity and availability of data and systems. Within our organization, we have a mature information technology security program and cybersecurity responsibilities are clearly defined. We regularly invest in technology and information system upgrades designed to prevent, detect and respond to attacks. We also perform tabletop exercises for executive leadership. We require all employees to complete quarterly cybersecurity-related training and awareness programs. We review the cybersecurity practices of our vendors who provide goods and/or services that could impact our plant control systems and require contractors with access to our plant control rooms to complete annual cybersecurity-related training. We also require enhanced diligence reviews on all contractors and employees who have access to our plant control systems. As part of the nation’s critical infrastructure network, we are subject to certain mandatory reliability standards, which include cybersecurity requirements. We have a formal compliance program to establish, monitor and maintain compliance that includes comprehensive cybersecurity elements designed to protect and preserve our critical information and energy infrastructure systems. We reference industry and government frameworks and best practices to continuously improve our cybersecurity program and we participate in industry groups and information sharing exchanges to understand emerging cybersecurity trends and threats. Georgia Transmission and Georgia System Operations provide us with certain transmission and system operations services that enable us to deliver energy to our members. As part of our risk management approach, we coordinate our cybersecurity preparedness and response planning with Georgia Transmission and Georgia System Operations. As part of our approach to cyber risk management, we regularly perform internal audits of internal processes and controls relating to cybersecurity to assess and enhance the effectiveness of our security programs. From time to time, as appropriate under our overall cybersecurity program, we engage third-party experts to support and audit our cybersecurity preparedness. We have also adopted cybersecurity incident response guidelines. As required by these guidelines, teams and plans are in place to respond to any cybersecurity incident, including internal and external communication responsibilities. As of the date of this annual report, we have not experienced any cybersecurity incident that has materially affected our business. See “RISK FACTORS” for a discussion of cybersecurity risks that may affect us.
Cybersecurity Risk Management Processes Integrated [Flag]	true
Cybersecurity Risk Management Processes Integrated [Text Block]	Our generating facilities are part of the United States’ energy infrastructure system and we face a myriad of cybersecurity threats. As such, cybersecurity is an area of continuous focus and we maintain a comprehensive cybersecurity risk management program with processes in place to assess, identify and manage cybersecurity risks. Our management and oversight of direct and indirect cybersecurity risks and our response to any cybersecurity incident is an integral part of our business.
Cybersecurity Risk Management Third Party Engaged [Flag]	true
Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]	true
Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]	false
Cybersecurity Risk Board of Directors Oversight [Text Block]	Our board of directors, along with the audit committee of our board of directors, is responsible for oversight of our cybersecurity risks and receives regular reports regarding our assessment and management of cybersecurity risks and information regarding any significant cybersecurity incidents.
Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]	Our board of directors, along with the audit committee of our board of directors, is responsible for oversight of our cybersecurity risks and receives regular reports regarding our assessment and management of cybersecurity risks and information regarding any significant cybersecurity incidents.
Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]	Our risk management and compliance committee also ensures our board of directors is briefed on cybersecurity risks, makes materiality determinations with regards to cybersecurity risks and monitors the active management of cybersecurity risks by internal and external teams.
Cybersecurity Risk Role of Management [Text Block]	Currently, our risk management and compliance committee, comprised of our chief executive officer, chief operating officer, chief financial officer, and the executive vice president of member and external relations, assesses and monitors material risks from cybersecurity threats. Members of our risk management and compliance committee receive regular updates regarding the prevention, mitigation, and detection of cybersecurity incidents and would oversee the response and remediation of any material cybersecurity incident. Our risk management and compliance committee also ensures our board of directors is briefed on cybersecurity risks, makes materiality determinations with regards to cybersecurity risks and monitors the active management of cybersecurity risks by internal and external teams.
Cybersecurity Risk Management Positions or Committees Responsible [Flag]	true
Cybersecurity Risk Management Positions or Committees Responsible [Text Block]	Currently, our risk management and compliance committee, comprised of our chief executive officer, chief operating officer, chief financial officer, and the executive vice president of member and external relations, assesses and monitors material risks from cybersecurity threats.
Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]	Members of our risk management and compliance committee receive regular updates regarding the prevention, mitigation, and detection of cybersecurity incidents and would oversee the response and remediation of any material cybersecurity incident.
Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]	true

Cybersecurity Risk Management and Strategy Disclosure

12 Months Ended

Dec. 31, 2024

Cybersecurity Risk Management, Strategy, and Governance [Line Items]

Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]

Our generating facilities are part of the United States’ energy infrastructure system and we face a myriad of cybersecurity threats. As such, cybersecurity is an area of continuous focus and we maintain a comprehensive cybersecurity risk management program with processes in place to assess, identify and manage cybersecurity risks. Our management and oversight of direct and indirect cybersecurity risks and our response to any cybersecurity incident is an integral part of our business.

We have a long-standing focus on cybersecurity risks and compliance with applicable safety protocols. Our primary cybersecurity focus areas are plant infrastructure, data privacy, and outsourced services. Within these areas, we maintain multi-faceted, layered security programs designed to protect and preserve the confidentiality, integrity and availability of data and systems. Within our organization, we have a mature information technology security program and cybersecurity responsibilities are clearly defined. We regularly invest in technology and information system upgrades designed to prevent, detect and respond to attacks. We also perform tabletop exercises for executive leadership.

We require all employees to complete quarterly cybersecurity-related training and awareness programs. We review the cybersecurity practices of our vendors who provide goods and/or services that could impact our plant control systems and

require contractors with access to our plant control rooms to complete annual cybersecurity-related training. We also require enhanced diligence reviews on all contractors and employees who have access to our plant control systems.

As part of the nation’s critical infrastructure network, we are subject to certain mandatory reliability standards, which include cybersecurity requirements. We have a formal compliance program to establish, monitor and maintain compliance that includes comprehensive cybersecurity elements designed to protect and preserve our critical information and energy infrastructure systems. We reference industry and government frameworks and best practices to continuously improve our cybersecurity program and we participate in industry groups and information sharing exchanges to understand emerging cybersecurity trends and threats.

Georgia Transmission and Georgia System Operations provide us with certain transmission and system operations services that enable us to deliver energy to our members. As part of our risk management approach, we coordinate our cybersecurity preparedness and response planning with Georgia Transmission and Georgia System Operations.

As part of our approach to cyber risk management, we regularly perform internal audits of internal processes and controls relating to cybersecurity to assess and enhance the effectiveness of our security programs. From time to time, as appropriate under our overall cybersecurity program, we engage third-party experts to support and audit our cybersecurity preparedness. We have also adopted cybersecurity incident response guidelines. As required by these guidelines, teams and plans are in place to respond to any cybersecurity incident, including internal and external communication responsibilities.

As of the date of this annual report, we have not experienced any cybersecurity incident that has materially affected our business. See “RISK FACTORS” for a discussion of cybersecurity risks that may affect us.

Cybersecurity Risk Management Processes Integrated [Flag]

true

Cybersecurity Risk Management Processes Integrated [Text Block]

Cybersecurity Risk Management Third Party Engaged [Flag]

true

Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]

true

Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]

false

Cybersecurity Risk Board of Directors Oversight [Text Block]

Our board of directors, along with the audit committee of our board of directors, is responsible for oversight of our cybersecurity risks and receives regular reports regarding our assessment and management of cybersecurity risks and information regarding any significant cybersecurity incidents.

Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]

Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]

Our risk management and compliance committee also ensures our board of directors is briefed on cybersecurity risks, makes materiality determinations with regards to cybersecurity risks and monitors the active management of cybersecurity risks by internal and external teams.

Cybersecurity Risk Role of Management [Text Block]

Currently, our risk management and compliance committee, comprised of our chief executive officer, chief operating officer, chief financial officer, and the executive vice president of member and external relations, assesses and monitors material risks from cybersecurity threats. Members of our risk management and compliance committee receive regular updates regarding the prevention, mitigation, and detection of cybersecurity incidents and would oversee the response and remediation of any material cybersecurity incident. Our risk management and compliance committee also ensures our board of directors is briefed on cybersecurity risks, makes materiality determinations with regards to cybersecurity risks and monitors the active management of cybersecurity risks by internal and external teams.

Cybersecurity Risk Management Positions or Committees Responsible [Flag]

true

Cybersecurity Risk Management Positions or Committees Responsible [Text Block]

Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]

Members of our risk management and compliance committee receive regular updates regarding the prevention, mitigation, and detection of cybersecurity incidents and would oversee the response and remediation of any material cybersecurity incident.

Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]

true