America’s Premier Competitive Power Company
... Creating Power for a Sustainable Future
W. Thaddeus Miller joined Calpine Corporation in August 2008 as Executive Vice President, Chief Legal Officer and Secretary. In March 2018, he was named Executive Vice Chairman of Calpine’s Board of Directors. Mr. Miller brings decades of legal and energy industry experience to Calpine. He previously served as Executive Vice President and Chief Legal Officer of Texas Genco Inc. until 2006. From 2002 to 2004, Mr. Miller was a consultant to Texas Pacific Group, a private equity firm. From 1998 to 2002, he served as Executive Vice President and Chief Legal Officer of Orion Power, an independent power producer. From 1994 to 1998, Mr. Miller was Vice President of Goldman Sachs & Co., where he focused on wholesale electric and other energy commodity trading. Before joining Goldman Sachs & Co., Mr. Miller was a partner in a New York law firm. Mr. Miller currently serves on the board of RMG Acquisition Corp. since December 2019. Mr. Miller earned his Bachelor of Science degree from the United States Merchant Marine Academy and his Juris Doctor from St. John's School of Law. In addition, he was an officer in the United States Coast Guard.
Charlie Gates joined Calpine as Executive Vice President of Power Operations in April 2016. Previously, Mr. Gates had served as Senior Vice President and Chief Fossil/Hydro Officer for Duke Energy Corporation since August 2014. He had been Duke’s SVP of Power Generation Operations since July 2012, when Progress Energy merged with Duke. Mr. Gates had served in a similar capacity for Progress since January 2012 after being promoted from Vice President of Fossil Generation for Progress Energy for the Carolinas and Florida. He was previously General Manager of Progress Energy Florida from the time the company merged with Carolina Power & Light Company in 2001 to 2006. Mr. Gates began his power industry career with Carolina Power & Light in 1982 as an associate engineer and moved up through increasingly responsible positions to become General Manager of five fossil-fuel plants in 2000. Mr. Gates’ other industry leadership roles include serving as Chairman of the Generation Council for the Electric Power Research Institute. He earned bachelor’s degrees in chemical engineering from North Carolina State University and in political science from the University of North Carolina.
Andrew Novotny has served as Executive Vice President and Chief Operating Officer since January 2021. In this role, Mr. Novotny is responsible for Calpine’s Commercial and Power Operations. Prior to his current role, he served as Executive Vice President of Commercial Operations, co-leading the company’s wholesale commercial operations and analytics functions while also providing oversight to Calpine's ISO and RTO advocacy across North America. Mr. Novotny joined Calpine in April 2012 as Vice President of Power Trading, holding a variety of trading leadership roles since that time. Before joining Calpine, Mr. Novotny served as Vice President of Financial Gas and Power Trading for the BG Group beginning in 2007. Prior to his time at the BG Group, Mr. Novotny was a Vice President with Duke Energy. Mr. Novotny received a Bachelor of Arts from Vanderbilt University, graduating magna cum laude with high honors in Economics. He also received a Master of Business Administration from Rice University, where he was named a Jones Scholar.
Caleb Stephenson has served as an Executive Vice President of Commercial Operations since March 2018. In this role, he leads the wholesale commercial and analytics function. He is responsible for the teams who develop wholesale customer relationships and new power projects, as well as those who support the company with information technology applications and infrastructure. Mr. Stephenson joined Calpine in October 2008 as Vice President of Commercial Analytics. He became Senior Vice President of Commercial Analytics in May 2014 and added wholesale origination to his responsibilities in February 2017.He came to Calpine from PA Consulting Group’s Global Energy Practice, where he advised merchant power industry participants on energy market outlook and risk management issues. He holds a Master of Business Administration in finance from Washington University.
Hether Benjamin Brown has served as Calpine’s Senior Vice President and Chief Administrative Officer since May 2014. In this role, she oversees the company’s Corporate Communications, Facilities, Human Resources, Information Technology, and Supply Chain Services functions. Ms. Benjamin Brown previously served as Calpine’s Senior Vice President of Human Resources beginning in February 2012. In this role, she led staffing and talent acquisition, organizational development, and compensation and benefits. She joined Calpine in May 2009 as Vice President of Supply Chain Services, and in that position she transformed and centralized Calpine’s supply chain function to improve efficiency, lower costs and leverage the company’s size and scale nationally. Prior to joining Calpine, she was Director of Supply Chain Management for the University of Texas M.D. Anderson Cancer Center. Previously, Ms. Benjamin Brown served in leadership roles of increasing responsibility at other public- and private-sector organizations in the aerospace/defense, environmental/waste and information technology industries. She holds a Bachelor of Arts in political science from the University of Texas at Arlington and a Master of Business Administration from Texas Women’s University.
Jeff Koshkin has served as Calpine’s Senior Vice President and Chief Accounting Officer since August 1, 2015, and gained additional responsibility as Chief Risk Officer in March 2018. He joined Calpine in December 2008 and has served in a number of leadership roles including the Controller of Commercial Operations and Controller of Corporate and Plant Accounting, as well as in interim roles heading Financial Planning and Analysis and as Chief Risk Officer. Prior to Calpine, Mr. Koshkin was a Senior Manager in the Regulatory and Capital Markets practice for Deloitte and Touche, LLP. He holds a master’s degree in Professional Accounting from the University of Texas at Austin. Mr. Koshkin is a Certified Public Accountant and a member of the American Institute of Certified Public Accountants and the Texas Society of Certified Public Accountants.
Kevin G. McMahon serves as Senior Vice President, Internal Audit and Chief Compliance Officer. He joined Calpine in May 2006 to lead the Internal Audit function and took on the added role of Chief Compliance Officer in August 2009. Mr. McMahon is responsible for managing and conducting all internal audit activities, supporting operations and the functional departments as requested, managing the Sarbanes Oxley (SOX) compliance oversight program, leading records management activities and reporting audit findings with the appropriate recommendations to senior management and the Audit Committee. In addition, he oversees the company’s regulatory compliance efforts with particular emphasis on ensuring that proper procedures are in place to help the company meet all FERC and NERC regulatory requirements. Prior to joining Calpine, he was Vice President and General Auditor for Exide Technologies, a global manufacturer of stored electrical energy products and services for industrial and transportation applications. He previously served as Vice President-Internal Audit Services and in other senior auditing positions for HCA, Inc., the largest hospital provider in the United States, and served in senior management and auditing positions for Ernst & Young LLP, Southern Company Services, FPL Group and HSBC/Marine Midland Bank N.A. Mr. McMahon has a Master of Business Administration degree from Palm Beach Atlantic University and a Bachelor of Science degree in accounting from the State University of New York. He is both a Certified Internal Auditor (CIA) and Certified in Risk Management Assurance (CRMA).