Talen Energy to Report First Quarter 2026 Results on May 5- View Release

Skip to content

About Talen
Our Portfolio
Powering Data
Investors
Contact Us
Search

CCR Rule Compliance Data and Information

Colstrip 1 & 2 Plantsite Landfill 1

Documents

Colstrip Plant Site LF1 Liner Design Certification Statement
Colstrip 1&2 CCR Plant Site Landfill 1 Closure Plan 202410
Colstrip 1&2 CCR Plant Site Landfill 1 Post-Closure Plan 202410
Colstrip 1&2 Plant Site Landfill 1 CCR Compliance Demo Report Aug 2024
Colstrip 1&2 Plant Site Landfill 1 Selection of Remedy Addendum_August 2024
Colstrip 1&2 Plant Site Landfill 1 Groundwater Monitoring Plan Certification_Nov 2024
Colstrip 1&2 Plant Site Landfill 1 Groundwater Monitoring Statistical Method Certification Nov 2024
2024 Colstrip CCR Annual Groundwater and Corrective Action Report - 1&2 Plantsite Landfill 1
Colstrip 1&2 Plant Site Landfill 1 Liner Construction Certification Statement
Colstrip 1&2 Plant Site Landfill 1 Alternative Source Demonstration April_2025
2025 Annual Fugitive Dust Control Report - 1&2 Plantsite Landfill 1
2025 Colstrip CCR Annual Groundwater and Corrective Action Report - 1&2 PS LF 1
Colstrip 1&2 CCR Plant Site Landfill 1 Closure Plan Updated Sept 2025
Colstrip 1&2 CCR Plant Site Landfill1 Post-Closure Plan Updated Sept 2025

Homepage
About Us
Our Portfolio
Powering Data
Investors
Contact Us

Retail Electricity
Machine Readable Files – Transparency in Coverage
Supplier Code of Conduct
Recruiting Privacy Notice

© Talen Energy 2025. All Rights Reserved.

Privacy Notice
Terms of Use
Sitemap

Edward T. Casulli

Edward T. Casulli

Chief Nuclear Officer

Edward Casulli serves as Talen Energy’s Chief Nuclear Officer, responsible for overseeing all aspects of the company’s Susquehanna nuclear power plant, a two-unit, approximately 2,500-megawatt station in Salem Township, Luzerne County, Pennsylvania.

Mr. Casulli has nearly 30 years of nuclear industry experience. Before assuming his current role in December 2025, he served as Site Vice President at Susquehanna, where he was responsible for all plant operations and personnel. Prior to joining the company in early 2023, he had a long-tenured career with Public Service Enterprise Group’s Hope Creek Nuclear Generating Station, where he held roles of increasing importance, including Vice President, Operations Shift Supervisor, Senior Manager, Plant Engineer, Senior Director – Operations, and Executive Director – Plant Manager.

A graduate of the University of Pennsylvania, Mr. Casulli earned an Executive Master of Science degree in Management of Technology. He is a veteran of the U.S. Navy and received a Bachelor of Science degree in Electrical Engineering from the U.S. Naval Academy before enrolling in the Naval Nuclear Propulsion Program, where he reached the rank of lieutenant.

Megan Toomey

Megan Toomey

Vice President – Environmental Affairs

Megan Toomey serves as Vice President of Environmental Affairs for Talen Energy. In this capacity, she leads environmental operations, policy, compliance and advocacy efforts for the company’s 13.1-gigawatt fleet of nuclear, natural gas, oil, and coal-fired generation facilities, as well as its other assets. Prior to her current role, she led Talen’s Environmental Projects group and held leadership roles in the company’s fossil engineering and regulatory teams.

Ms. Toomey has been in the energy industry for nearly 20 years, working for Burns & McDonnell and PPL Corporation prior to joining Talen. Her career has afforded her the opportunity to develop expertise in a wide range of areas -including engineering, thermal power plant operations and maintenance, environmental compliance and regulatory advocacy, and state government relations.

A graduate of Iowa State University, Ms. Toomey holds a Bachelor of Science degree in Chemical Engineering.

Julie LaBella

Senior Vice President – External Affairs

Julie LaBella serves as Talen Energy’s Senior Vice President of External Affairs. She is responsible for leading the company’s advocacy efforts related to state and federal policy and oversees Talen’s corporate communication function.

Ms. LaBella has more than two decades of experience in the energy industry. In addition to her current responsibilities, she held leadership roles in the areas of commodity risk management, compliance, and financial analysis. She began her career at PPL Corporation, where she spent nearly 15 years as a leader within corporate risk management, providing oversight for commodity risk and its enterprise risk management function. She continued in that role with Talen Energy in 2015.

After joining Talen, Ms. LaBella later transitioned into a leadership position within the company’s Regulatory and External Affairs department. Within this team she now leads advocacy efforts and drives policy solutions to promote and protect the interests of the company and its 12 generating facilities located in four states. She also co-chairs the company’s nuclear decommissioning trust committee which provides oversight and guidance on the investment activities of the fund.

Ms. LaBella holds a bachelor’s degree in Finance from Indiana University of Pennsylvania and a master’s degree in Business Administration, Finance and Accounting from St. Bonaventure University.

Active in the community, she currently serves as Treasurer on the Board of Directors and as Chair of the Finance Committee at the Third Street Alliance for Women and Children and is a member of the Impact Council at the United Way of the Greater Lehigh Valley.

Darren Olagues

Darren Olagues

Chief Development Officer

Darren Olagues serves as the Chief Development Officer for Talen Energy. In this capacity, he leads the company’s corporate strategy and development activities.

Mr. Olagues has over 25 years of energy experience, serving in a variety of leadership roles throughout his career. Before joining Talen Energy, he was Chief Financial Officer and Senior Advisor for independent power producer GenOn Energy, where he currently serves on the Board of Directors. Mr. Olagues also held various leadership roles with Cleco affiliated companies, including President and CEO of Cleco Corporate Holdings and President of Cleco Power where he led its $4.7 billion take private transaction. Prior to his tenure with Cleco, he held financial leadership roles at Exelon Corporation and Sithe Energies.

A graduate of Tulane University, New Orleans, Mr. Olagues has bachelor’s degree in Accounting and Business/Management.

Jennifer Mansh

Senior Vice President, Regulatory and External Affairs

Jennifer Mansh serves as Senior Vice President, Regulatory and External Affairs for Talen Energy. She is responsible for the development and implementation of federal regulatory and policy strategies, as well as overseeing regulatory and NERC compliance for Talen and its subsidiaries.

Ms. Mansh has worked in the energy industry for almost 20 years. Most recently, she served as Counsel with Vinson & Elkins, where she represented electric utility companies, merchant transmission companies, wholesale power marketing companies, financial institutions, and generation companies in rate, licensing, and enforcement proceedings before FERC. Prior to joining Vinson & Elkins, she was a Senior Associate Attorney with Gibson, Dunn & Crutcher LLP for almost a decade, where she was recognized in “The Best Lawyers in America: One to Watch” for Energy Law.

Ms. Mansh began her career working at Exelon Corporation’s wholesale marketing division at the time, called Power Team, where she was a Senior Financial Analyst.

Ms. Mansh graduated cum laude from Bryn Mawr College in Pennsylvania with a Bachelor of Arts degree in Economics. She received her Juris Doctorate with honors from Washington University School of Law in St. Louis. She is a member of the Pennsylvania and District of Columbia Bar Associations and is admitted to practice in Pennsylvania and the District of Columbia.

Katie Sussen

Katie Sussen

Vice President, Finance

Katie Sussen serves as Vice President, Finance for Talen Energy. In this role she leads the Company’s financial planning and analysis, plant finance, and supply chain functions and is responsible for its long-term planning activities.

With over 15 years of experience in the energy industry, Ms. Sussen has deep experience in the competitive power generation sector. Prior to joining Talen, she served in senior finance roles at NRG Energy, Inc., GenOn Energy, Inc., and Dynegy, a subsidiary of Vistra Corp.

Ms. Sussen holds Bachelor of Accounting and Master of Business Administration degrees from Southern Illinois University at Carbondale and is a Registered Certified Public Accountant in the state of Illinois.

Ellen Liu

Senior Director, Investor Relations

Ellen Liu is Talen Energy’s Senior Director of Investor Relations. In that capacity, she establishes and manages the company’s relationships with shareholders, prospective investors, and research analysts, oversees strategic communications with the financial community, and leads key areas of the quarterly reporting process.

Prior to joining Talen, Ms. Liu was a Vice President at Jefferies in the Energy Investment Banking group. In her six years there, she advised on M&A, public and private financings, and other strategic alternatives for energy companies. She also oversaw intern recruiting and analyst staffing. Ms. Liu joined Talen in 2019 as Director of Corporate Development, managing transactions and special projects.

Ms. Liu holds a bachelor’s degree in Economics and Statistics from Rice University and an MBA from Stanford Graduate School of Business.

Sergio Castro

Vice President and Treasurer

Sergio Castro serves as Vice President and Treasurer for Talen Energy. In this role, he leads the company’s treasury, capital markets, and investor relations functions.

Mr. Castro has significant experience in financial leadership roles within the energy sector. Prior to joining Talen, he served as Chief Financial Officer for Otto Energy where he oversaw all areas of the Finance organization. During his tenure with Contango Oil & Gas Company, Mr. Castro held positions of increasing importance, including Assistant Treasurer, Vice President & Treasurer, and Chief Financial Officer, and played key roles in several mergers and acquisitions, capital raises, and asset divestiture transactions.

A summa cum laude graduate of the University of Houston, Mr. Castro holds a bachelor’s degree in Accounting and is a Certified Public Accountant and Certified Fraud Examiner. He also proudly served in the United States Navy prior to pursuing his undergraduate studies.

Christine Benson Schwartzstein

Director

Ms. Benson has over 20 years of experience in natural resources risk management, capital markets, and investing. She previously served as a member of Orion Infrastructure Capital’s Senior Advisory Board after retiring as a Managing Director and Investment Principal in 2022.

Before joining OIC, Ms. Benson spent 17 years in various roles at Goldman Sachs. Most recently, she was a Managing Director in the Financing Group on the Structured Finance and Risk Management team in the Investment Banking Division; there she was responsible for the firm's commodity structured finance efforts within Investment Banking. Prior to that, Ms. Benson was a Managing Director on the Energy Sales and Structuring teams in the Securities Division. She began her career at Goldman Sachs in 2004 as an analyst on the Energy team.

Ms. Benson serves as co-chair of a Harvard School Committee in New York City and previously served on the Board of Directors for the Women's Energy Network - Greater New York City Chapter, Inc. Ms. Benson received an A.B. in Earth and Planetary Sciences, magna cum laude, from Harvard University in 2004. There she focused on Structural and Economic Geology and published research on earthquakes in Southern California.

Joseph Nigro

Director

A 33-year veteran of the energy industry, Mr. Nigro is an advisor to the Exelon CEO until March 31, 2023, and was most recently Exelon’s Chief Financial Officer from May 2018 to October 2022. He was also a member of the Exelon Executive Committee and served as Chair of Exelon’s Corporate Investment Committee. Previously, Mr. Nigro served as Chief Executive Officer of Constellation, an Exelon operating division, from 2013 to 2018 and as senior vice president, portfolio strategy, prior to that.

Before joining Constellation, he was the senior vice president, portfolio management and strategy, for the Exelon Power Team. In addition, Mr. Nigro led the merger integration for the Exelon Power Team wholesale trading and marketing organization with Constellation Energy. Mr. Nigro’s previous roles include: vice president, structuring and portfolio management; director, commercial transactions; manager, Northeast Region, responsible for the trading and marketing of Exelon’s assets in New England; integration lead – Power Team/Sithe New England Holdings; manager, financial trading – hedge book; and financial transaction. Mr. Nigro started with PECO Energy, now an Exelon company, in 1996 and also spent seven years prior with Phibro Energy, Inc., an independent oil trading and refining company.

Mr. Nigro received his bachelor’s degree in economics from the University of Connecticut. He has also completed the Exelon Leadership Institute Program through the Northwestern University Kellogg School of Management, the University of Chicago Executive Development Program, and the MIT Reactor Technology Course for Utility Executives.

Mr. Nigro also serves on the board of directors for the Chicago Public Library and previously served on the Advisory Board for FM Global Mutual Insurance Company – Philadelphia/Washington region.

Karen Hyde

Director

Ms. Hyde served as Senior Vice President, Chief Compliance & Ethics Officer, Chief Audit Executive, and Chief Risk Officer of Xcel Energy until her retirement in 2022. Across her 30 years with Xcel Energy, Ms. Hyde served in various roles with increasing responsibility, including roles in rates and regulatory affairs, resource planning and acquisition, and risk management. She was also responsible forecasting and production cost, expansion plan modeling, and evaluating the effectiveness of compliance programs, control frameworks, and Ms. Hyde spent approximately a decade negotiating structured power purchase arrangements, including Xcel Energy’s initial renewable energy contracts, and was responsible for renewable energy compliance.

Prior to joining Xcel Energy, Ms. Hyde was a lead nuclear engineer as a civilian employee of the United States Department of Defense where she was responsible for overhauling submarine reactors.

Ms. Hyde has a Bachelor of Science in Metallurgical Engineering from Lafayette College and a Master of Science in Mineral Economics from the Colorado School of Mines.

Anthony Horton

Director

Mr. Horton currently serves as Chief Executive Officer of AR Horton Advisors.

Mr. Horton has more than 25 years of energy and technology experience and was Executive Vice President and Chief Financial Officer at Energy Future Holdings and Senior Director of Corporate and Public Policy at TXU Energy. He also has experience serving on various boards of directors and committees of companies involved in turnarounds and restructuring matters.

Mr. Horton holds a Master of Professional Accounting and Finance degree from the University of Texas at Dallas/Arlington and a BBA in Economics and Management from the University of Texas at Arlington. He is a Certified Public Accountant, Chartered Financial Analyst, Certified Management Accountant, and Certified Financial Manager.

Gizman Abbas

Director

Mr. Abbas has nearly 30 years of energy and investment experience. He is a Founding Principal of Direct Invest Development and currently serves on the Board of Directors of the New York Independent System Operator as Chairman of the Commerce & Compensation Committee and a member of the Reliability & Markets Committee. Over the last 11 years, Mr. Abbas has served on the Board of Directors of Crown Electrokinetics as Chairman of the Compensation Committee and as a member of the Audit and Governance Committees, as an Audit Committee member at Aranjin Resources Ltd., Chairman of the Compensation Committee and as an Audit Committee member at KLR Energy Acquisition Corporation, and as an Audit Committee Member at Handeni Gold.

As a long-term outspoken proponent of environmental engagement, Mr. Abbas has successfully invested in green power, biofuels, and emissions credits. Before his service on public company boards, Mr. Abbas was a founding partner of the commodity investment business at Apollo Global Management, a Vice President at Goldman Sachs, an investment associate at Morgan Stanley, a Senior Project Engineer on oil and gas construction projects for Exxon Mobil Corporation, and a Co-Op Power Engineer at Southern Company as a field and plant engineer.

Mr. Abbas holds a Bachelor of Science Degree in Electrical Engineering from Auburn University and a Master of Business Administration from Northwestern University’s Kellogg School of Business.

Stephen Schaefer

Chairman

Mr. Schaefer currently serves as Chairman of the Board of Talen Energy Corporation. He also serves as a member of the Board of Directors for GenOn Energy and Golar LNG (NASDAQ: GLNG) and as a Senior Advisor for EverGen Power LLC. He previously served as Chairman at GenOn Energy and at Texgen Power LLC and was a member of the Board of Directors for Just Energy, Homer City Holdings LLC and Element Markets LLC.

Mr. Schaefer has been actively involved in the deregulated natural gas and electricity markets since 1993. He was a Partner with Riverstone Holdings, a private equity firm focused on energy investing, from 2004 to 2015. While at Riverstone, he served on two of its investment committees and was primarily responsible for conventional power and renewable energy investments. Prior to joining Riverstone, Mr. Schaefer was a Managing Director with Huron Consulting Group, where he founded and headed its Energy Practice. From 1998 to 2003, Mr. Schaefer was Managing Director and Vice President with Duke Energy North America responsible for mergers and acquisitions.

Mr. Schaefer is a Chartered Financial Analyst and received his B.S., magna cum laude, in Finance and Accounting from Northeastern University in 1987.

Olivia Sigo

Olivia Sigo

Vice President, Risk Management

Olivia Sigo serves as Talen Energy’s Vice President of Risk Management. She is responsible for the risk management function, including market risk, trade control activities, position reporting, P&L reporting, enterprise risk management, and credit risk management activities for the overall Company.

Ms. Sigo has over a decade of experience in the energy and power industry, with responsibilities including financial analysis, business management, and derivative sales. She began her career at Merrill Lynch, where she held various roles, including serving as an analyst for the commodities sales team. After Merrill Lynch, she spent over eight years at Deutsche Bank, where she was responsible for the overall management of the North American power and gas trading business, including facilitating growth initiatives, managing risk, and ensuring best practices and infrastructure were in place. Ms. Sigo joined Talen Energy in January 2018, where she eventually served as finance lead for over 3GW of generation.

Ms. Sigo holds a bachelor’s degree in Finance from the University of Houston-Downtown.

Anthony Plagens

Senior Vice President and Chief Accounting Officer

Anthony “Tony” Plagens serves as Talen’s Senior Vice President and Chief Accounting Officer. In this role, he leads the company’s accounting and external financial reporting activities. Mr. Plagens has over 20 years of combined energy industry and public accounting experience and joined Talen in September 2017 as Managing Director & Corporate Controller.

Prior to joining Talen Energy, he served as North American Controller for Mercuria Energy Trading. He also served in accounting management capacities at companies including ConocoPhillips, BP, and Ernst & Young across a variety of geographies throughout the U.S., U.K., and China.

A graduate of Albion College in Albion, Michigan, Mr. Plagens holds a B.A. in Economics and Management and is a Certified Public Accountant.

Andy Wright

Andy Wright

Chief Administrative Officer

Andrew “Andy” Wright was appointed as Talen Energy’s first Chief Administrative Officer in June 2023 after having served as the company’s General Counsel and Corporate Secretary since June 2018. In this capacity, Mr. Wright oversees Talen’s Human Resources, Information Technology, Facilities, and Corporate Security functions.

Prior to joining Talen Energy, Mr. Wright spent 14 years as in-house counsel for Energy Future Holdings (EFH) Corp., most recently as Executive Vice President, General Counsel and Corporate Secretary.

Mr. Wright has a wealth of experience in the power generation space with an intimate knowledge of the financial, operational, and regulatory challenges facing the industry. He has led numerous fleet and balance sheet restructuring efforts, complex acquisitions and divestures, high-stakes litigation, and regulatory reviews. His experience includes being involved in the largest leveraged buyout in U.S. history and some of the largest financial restructurings in the industry. He also has worked closely with the board of directors at Talen Energy and EFH.

After receiving his Juris Doctorate from the University of Notre Dame, Mr. Wright went into private practice with Vinson & Elkins in both Dallas, Texas and London, England with a focus on corporate securities, mergers and acquisitions, and corporate governance.

Prior to pursuing his law career, he received a degree in Accounting from Southern Methodist University, obtained his CPA and practiced as an accountant with KPMG in Chicago, Illinois.

John Wander

John C. Wander

General Counsel and Corporate Secretary

John Wander joined Talen Energy in June 2023 as General Counsel and Corporate Secretary. In this position he leads the company’s Legal and Regulatory and External Affairs functions, oversees corporate governance, and serves as the primary point of contact for its Board of Directors.

Mr. Wander has 32 years of experience in commercial law with cases primarily pertaining to finance, accounting, and shareholder issues. Prior to joining Talen, he served as Partner – Shareholder Litigation & Enforcement for Vinson & Elkins and as the firm’s General Counsel. He joined the firm in 1994 and worked on some of its most high-profile, high-stakes litigation matters, focusing his practice on commercial litigation in the accounting, securities, manufacturing, and insurance industries, and routinely representing issuers and accounting firms before the Securities & Exchange Commission. He also tried numerous corporate governance cases in the Delaware Chancery Court. Mr. Wander variously held several leadership positions, including Managing Partner of the Dallas office, Co-Department Head of Litigation and Regulatory, Co-Practice Group Leader of Complex Commercial Litigation, and a member of the Management Committee.

Throughout his career, Mr. Wander has received a variety of accolades including multi-year recognition from Chambers USA in the areas of Litigation: Securities (Texas) from 2014-2022 and Litigation: White Collar Crime & Government Investigations from 2017-2022. He also was named one of the “Best Lawyers in Dallas” by D Magazine, one of The Best Lawyers in America^® Commercial Litigation (Dallas) by BL Rankings, LLC from 2013-2023, as a top attorney in Texas from 2011-2020 and 2022 by Super Lawyers (Thomson Reuters), and as a member of its Texas Rising Stars list from 2004-2006. He also was named to the Global Investigations Review (GIR) 100 in 2020.

A graduate of the University of Texas School of Law, Mr. Wander received his Juris Doctorate with honors in 1994. He also received a Bachelor of Arts degree from Northwestern University, Evanston, Ill. He is a member of the American Bar Association and Dallas Bar Association. Mr. Wander is admitted to practice in Texas, all U.S. District Courts in Texas and Arkansas, and the Fifth Circuit Court of Appeals.

In the community, Mr. Wander has served on the Board of Directors for Vogel Alcove, which provides services for Dallas’ homeless children and families, since 2009 and as its Chair from 2018- 2020. He has served as a member of the Board of Trustees for The Center for American and International Law, the University of Texas School of Law Alumni Association Executive Committee, and the University of Texas Chancellor’s Council Executive Committee.

Terry Nutt

Terry Nutt

President

Terry Nutt serves as President of Talen Energy Corporation. In this capacity, he is responsible for overseeing the daily operations of the company’s business, including plant operations, commercial activities, administrative functions, regulatory, and other external stakeholder engagements.

Mr. Nutt has over 25 years of experience in the energy industry, including time spent at independent power producers and energy trading firms. Prior to assuming his current role with the company, he served as Talen’s Chief Financial Officer from July 2023 through December 2025. From 2018 until 2023, he served as Chief Financial Officer and Managing Director for EDF Trading North America, the energy commodity trading subsidiary of Électricité de France (EDF) S.A., a multinational energy utility headquartered in France. Prior to his service at EDF, Mr. Nutt served in multiple senior finance positions at Vistra Corporation (and its predecessor entities), including as Senior Vice President and Controller and Senior Vice President of Risk Management. Previous to his time at Vistra, Mr. Nutt worked in various finance roles at Dynegy Inc.

Mr. Nutt earned his M.S. in Accounting and his B.B.A., summa cum laude, from Texas A&M University.

Cole Muller

Cole Muller

Chief Financial Officer

Cole Muller is Chief Financial Officer of Talen Energy Corporation and is responsible for the company’s accounting, treasury, risk management, financial planning, investor relations, tax, and internal audit functions.

Mr. Muller has held multiple leadership roles during his tenure with Talen. Prior to assuming his current role in December 2025, he served as Executive Vice President, Strategic Ventures, leading the company’s strategic direction related to digital infrastructure development and data center contracting. Previous to that, he led the company’s PJM Fossil business unit, where he was responsible for over eight gigawatts of PJM generation assets in Pennsylvania, Maryland, and New Jersey.

Before joining Talen in 2018, he was an Associate Partner for McKinsey & Co., advising energy clients, including Talen, on strategic opportunities and operational transformations. He also previously served as a submariner in the U.S. Navy.

A graduate of the U.S. Naval Academy, Mr. Muller holds a Bachelor of Science degree in Mathematics. He received his MBA from The Wharton School and his JD from the University of Pennsylvania.

Chris Morice

Chris Morice

Chief Commercial Officer

Chris Morice was appointed Chief Commercial Officer of Talen Energy in 2023, overseeing the company’s wholesale trading and fleet optimization activities.

With 15 years of profitable leadership, Mr. Morice began his career in New York City at Lehman Brothers before moving to Houston with Lehman’s acquisition of Eagle Energy Partners in 2009.

Mr. Morice joined Talen in 2017 as Desk Head/Lead Trader, tasked with P&L responsibilities, managing numerous products across multiple regions. Prior to joining Talen, he worked exclusively in market-facing, risk-taking, revenue-generating roles at Koch Energy, Topaz Power, and EDF Trading.

Mr. Morice holds a bachelor’s degree from the University of Missouri, Columbia and a master’s degree from Fordham University, Bronx, New York.

Dale Lebsack

Dale Lebsack

Chief Asset Development Officer

Dale Lebsack serves as Chief Asset Development Officer for Talen Energy. In this capacity, he is responsible for assessing, designing, and constructing new generation assets for the company, as well as developing site opportunities for new generation and large load interconnections.

Mr. Lebsack joined Talen in 2015 as part of its acquisition of RJS Power from affiliates of Riverstone Holdings, LLC, and since joining the company, he has taken on roles of increasing importance. Before assuming his current role in December 2025, he served as Talen’s Chief Fossil Officer, leading the company’s approximately 10-gigawatt fossil generation fleet. Prior to that, he was the business unit leader for Talen’s generation assets in Montana, ERCOT, and the Northeast and the company’s Senior Vice President, Fossil Operations.

Prior to joining Talen, Mr. Lebsack held various leadership roles with RJS Power and its affiliates in asset management, project development, plant operations, and environmental, health and safety. In those roles, he led the technical planning and permitting related to a $1.2 billion repowering of three power plants in ERCOT and led the acquisition of two asset portfolios in PJM. Apart from his roles with RJS Power, Mr. Lebsack’s experience includes plant-level positions with Duke Energy North America and Energy.

A graduate of Georgia Institute of Technology, Mr. Lebsack earned a B.S. in Mechanical Engineering.

Brad Berryman

Brad Berryman

Chief Operating Officer

Brad Berryman serves as Talen Energy’s Chief Operating Officer, responsible for overseeing the company’s generation fleet, which is primarily located in the Mid-Atlantic and Ohio.

Prior to assuming his current role in December 2025, Mr. Berryman served as Talen’s Senior Vice President and Chief Nuclear Officer for seven years. In this role, he oversaw all aspects of the company’s Susquehanna nuclear power plant. He joined the company in early 2017 as Site Vice President, and was central to Susquehanna moving from a third quartile to a top decile industry ranking based on its operational, financial, and safety performance.

With three decades of extensive commercial nuclear experience, Mr. Berryman has held positions of increasing importance spanning various technical, operational, training, and financial capacities. Prior to joining Talen, he served as General Manager at Turkey Point Nuclear Generating Station. He also held leadership roles at Wolf Creek Nuclear Operating Corporation, Palo Verde Nuclear Generating Station, and Arkansas Nuclear One. In addition, he proudly served his country in the United States Navy as part of the submarine fast attack fleet.

Mr. Berryman earned his B.S. in Organizational Management from Central Baptist College.

Active in the community, Mr. Berryman serves on the board of the United Way of Wyoming Valley and participates in a variety of company volunteer initiatives.

Mark A. 'Mac' McFarland

Mark A. “Mac” McFarland

Chief Executive Officer and Director

Mark (“Mac”) McFarland is the Chief Executive Officer of Talen Energy Corporation. He was appointed to the role in May 2023 and concurrently joined the company’s Board. In his capacity as Chief Executive Officer, Mr. McFarland oversees all aspects of the company’s long-term strategic direction.

Mr. McFarland previously served as President and Chief Executive Officer as well as Chairman of the Board of California Resources Corporation (CRC), an independent energy and carbon management company committed to energy transition. He continues to serve on the Board of CRC and Chairs Carbon TerraVault, a wholly owned subsidiary of CRC. Prior to his roles with CRC, he was Executive Chairman of GenOn Energy, an independent power producer. He also served as their President and Chief Executive Officer from April 2017 to December 2018 and continued on as a member of their Board the until September 2022. From 2013 to 2016, he served as Chief Executive Officer of Luminant Holding Company LLC, a subsidiary of Energy Future Holdings Corporation, a large independent power producer. From 2008 to 2013, he served as both Chief Commercial Officer of Luminant and Executive Vice President, Corporate Development and Strategy of Energy Future Holdings. From 1999 to 2008, Mr. McFarland served in various roles at Exelon Corporation, including as Senior Vice President, Corporate Development.

Currently, Mr. McFarland serves on the Board of Directors of the Nuclear Energy Institute, and previously served on the Boards of TerraForm Power, Bruin E&P Partners, and Chaparral Energy.

Mr. McFarland earned his Master of Business Administration Degree from the University of Delaware and a Bachelor of Science degree in Civil Engineering (Environmental Concentration) from Virginia Polytechnic Institute and State University. He received his professional engineer license in 1995.

Scroll To Top