UNS Energy’s Regulated Utilities
Tucson Electric Power provides the energy to more than 458,000 customers in the Tucson metropolitan area.
UniSource Energy Services provides energy to about 278,000 customers across Arizona.
UNS Energy Corporation
UNS Energy is the Tucson, Arizona-based parent company of Tucson Electric Power (TEP) and UniSource Energy Services (UES). TEP serves more than 458,000 customers in and around Tucson, while UES provides natural gas and electric service to about 278,000 customers in northern and southern Arizona.
UNS Energy is a subsidiary of Fortis, the largest investor-owned electric and gas distribution utility in Canada. Fortis' regulated utility subsidiaries serve more than 3 million customers across Canada and in the United States and the Caribbean. Fortis also owns non-regulated hydroelectric generation assets in Canada, Belize and upstate New York.
Board of Directors
- Board Chair – Pamela D. Kehaly, CEO of Blue Cross Blue Shield of Arizona
- Jeffrey Benck, President and CEO of Benchmark Electronics
- Patricia Chiodo, former Chief Financial Officer, Verra Mobility
- Roger Dall’Antonia, President and CEO, FortisBC
- Susan M. Gray, President and CEO, UNS Energy Corp.
- Matthew Hilzinger, former Executive Vice President and Chief Financial Officer of USG Corp.
- Michael Hummel, Former General Manager of the Salt River Project
- Lisa M. Lovallo, Former Market Vice President of Southern Arizona for Cox Communications
- Jocelyn Perry, Executive Vice President and Chief Financial Officers of Fortis, Inc.
- Michael Simpson, CEO of Clinisys, Inc.
- Gary J. Smith, Executive Vice President, Operations and Innovation of Fortis, Inc.
Susan Gray — President and Chief Executive Officer
Susan was named Chief Executive Officer of UNS Energy and its subsidiaries, including Tucson Electric Power and UniSource Energy Services, by the UNS Energy Board of Directors, effective January 1, 2021. Susan, the first woman to lead the company, has championed efforts to promote the engagement and achievement of women in the utility industry.
Susan, who had served as the company’s President and Chief Operating Officer, succeeds CEO David G. Hutchens, who was named President and Chief Executive Officer of Fortis Inc., UNS Energy’s parent company.
She began her career as a student intern at TEP in 1994. She was hired as system engineer in 1997 and advanced through several engineering and leadership roles before being named Vice President of Energy Delivery in 2015. She was promoted to Senior Vice President and Chief Operating Officer in 2019, and named President of UNS Energy in 2020.
Susan earned a bachelor’s degree in electrical engineering and an MBA from the University of Arizona, where she serves on advisory boards for the UA’s Eller Graduate School of Management and College of Engineering. The Chair of the economic development organization Sun Corridor, Susan also serves on the board of the Boys and Girls Clubs of Southern Arizona and is a member of the Southern Arizona Leadership Council.
Caleb Adcock — Vice President and Chief Financial Officer
Caleb came to TEP in 2015 as Manager of External Reporting. He advanced through various leadership roles in accounting and finance before being named VP of Finance in 2023. He assumed his current role, VP & Chief Financial Officer, in January 2025. Before joining TEP, Caleb worked for six years in public accounting for a Las Vegas-based accounting firm before advancing to management roles at NV Energy and Tropicana Entertainment. He is a Certified Public Accountant licensed in both Arizona and Nevada and holds a bachelor’s degree in Accounting from The Master’s University in Santa Clarita, Calif.
Erik Bakken — Senior Vice President and Chief Administrative Officer
Erik joined TEP as a Corporate Counsel in 2000 after earning a bachelor’s degree in political science from Arizona State University and a juris doctorate from the University of Arizona. He advanced through management positions in Land Resources and Environmental Services and was promoted to Senior Director of Transmission & Environmental Services in 2014. He was promoted to Vice President of Transmission & Distribution Planning and Environmental in 2018 before taking on expanded responsibilities in his current role.
Eric Bronner — Vice President, Energy Management, Planning and Development
Eric joined TEP in 2019 as a Senior Advisor and has advanced through various management positions overseeing TEP’s transmission and distribution planning, system control and reliability, and renewable development groups before being named Vice President, Energy Management, Planning, and Development in 2025. Prior to his time at TEP, Eric was an officer with the independent power producer Entegra Power Group, where he was responsible for the company’s marketing, strategy, and asset management. Eric earned a bachelor’s degree in Chemical Engineering from the University of South Florida and a master’s degree in business administration from the University of Florida.
Ana Bustamante — Vice President of Energy Delivery
Ana began her career in 1997 as an engineer at Citizens Utilities Company, the company then providing natural gas and electric service in Nogales, Arizona. After she joined Citizens, it was acquired and incorporated into UniSource Energy Services, a sister company to Tucson Electric Power. Ana advanced through engineering roles at Tucson Electric Power to lead our companies’ shared T&D Engineering and Design teams. She was named Senior Director in 2016, later adding oversight of T&D Field Operations to her responsibilities. She assumed her current role in January 2025. Ana earned her bachelor’s degree in mechanical engineering from Arizona State University.
Dallas Dukes — Vice President, Customer Experience and Corporate Strategy
Dallas joined TEP in 2004 as Director of Corporate Accounting after serving as Divisional Controller for Citizens Gas & Coke Utility (now Citizens Energy Group) in Indianapolis. He became Director of Rates and Revenue Requirements in 2005 and was later promoted to Senior Director in that role, eventually assuming oversight of areas including new programs and services, customer analytics, renewable energy and energy efficiency programs. He was promoted to Vice President in 2019. Dallas is a Certified Public Accountant and earned a bachelor’s degree in accounting from Indiana University and an MBA from Anderson University.
Cynthia Garcia — Senior Vice President and Chief Operating Officer
Cynthia oversees all generation, transmission and distribution operations at Tucson Electric Power. Cynthia worked as the division controller for a software development company before joining TEP in 2000. After starting as a Lead Accountant, she became a T&D supervisor and project manager, leading teams that delivered large-scale line construction projects. She advanced through T&D leadership roles that expanded her responsibilities before being promoted to Vice President of Energy Delivery in January 2020. She was appointed to Chief Information Officer and Vice President of Engineering and Safety in May 2022 and then to Chief Information Officer and Vice President of Energy Delivery and Safety in July 2023. Cynthia earned a bachelor’s degree in accounting and finance from the University of Arizona.
Erik Keller — Vice President, Chief Information Officer
Erik joined TEP in 2025 with more than three decades as an IT executive, team builder, and inspirational leader with global experience in IT transformation across multiple industries, from energy to banking and aviation. Before joining TEP, he served as Senior Vice President and Chief Information Officer for Black Hills Energy in Rapid City, South Dakota. Erik, who holds a bachelor’s degree in Systems Analysis from Miami University, has led several multi-year efforts to transform IT service delivery, implement comprehensive cloud strategies, and deliver critical new, innovative capabilities through modernized applications.
Frank P. Marino — Senior Vice President of Finance
Frank became Senior Vice President in 2019, having previously served as Vice President and Chief Financial Officer. Before joining TEP in 2013, Frank was a Vice President and Chief Financial Officer of the wind and solar businesses of the AES Corporation, a global power company. Frank is a Certified Public Accountant and has a bachelor’s degree in accounting from the State University of New York and an MBA from Fairleigh Dickinson University.
Terry Nay — Vice President of Energy Resources
Terry oversees power generation as part of our work to provide safe, reliable service. Recognized as a collaborative and results-oriented leader with a strong strategic focus, Terry joined the company in 2008 as Manager of Corporate Safety. He was appointed to Senior Director of UNS Electric and Corporate Safety in 2012. Terry assumed leadership of TEP Field Operations and UniSource Energy Services in 2021. Terry was appointed to Vice President of Field Operations in May 2022 and to his current role as Vice President of Energy Resources in July 2023. He holds a master’s degree in business administration.
Chris Norman — Vice President of Public Policy
Chris joined TEP in 2001 as a Senior Analyst, assuming increasingly complex roles in Investor Relations and Regulatory Services. He served as Director of Regulatory Services and Chief of Staff to the Chief Executive Officer from 2017 to 2019, before being promoted to Senior Director in 2020 and Vice President in 2022. He as a bachelor’s degree in finance from the University of Nebraska and holds an MBA from the University of Arizona.
Jason Rademacher — Vice President of Finance and Rates
Jason was named Vice President of Finance and Rates in 2025, bringing more than 20 years of experience at TEP and deep expertise in ratemaking concepts, tax law, and accounting. His strategic leadership is grounded in a strong technical foundation as well as a consistent focus on delivering value to both customers and employees. Jason holds a bachelor’s degree in Accounting from the State University of New York and is a Certified Public Accountant.
Michael Sheehan — Vice President of Fuels and Resource Planning
Mike came to TEP in 1993 as an Information Services Specialist. He transitioned to Energy Settlements in 1998, where he worked as an analyst before being promoted to Manager of Resource Planning in 2001. Mike was promoted to Director of Resource Planning in 2010, and then to Senior Director of Fuels and Resource Planning in 2015. He holds a bachelor’s degree in Management Information Systems from the University of Arizona.
Amy Welander — Vice President, General Counsel, Chief Compliance Officer and Corporate Secretary
Amy joined TEP in 2008 as in-house regulatory counsel, focusing on a variety of federal regulatory matters and transactions, including compliance with Federal Energy Regulatory Commission (FERC) regulation. She became Assistant General Counsel, Federal Regulation & Compliance in 2014 and was promoted to Senior Director and Assistant Corporate Secretary for UNS Energy Corporation in 2020. Amy earned both a bachelor’s degree in Business Administration, Finance from the University of Arizona and a juris doctorate from the Arizona State University. She worked as an associate at Lewis & Roca before joining TEP.
Gail Zody-Serbia — Vice President of Human Resources
Gail was named Vice President of Human Resources in 2022. She previously served as Human Resources Director for Southwest Gas and held leadership roles at Sierra Nevada Corporation, L3 Technologies and Securitas Security Services. She holds an MBA from Western International University in Phoenix and a bachelor’s degree in Sociology/Political Science from Northern Arizona University.
Martha B. Pritz — Treasurer
Since joining TEP in 1999, Martha has held various leadership roles in financial planning, treasury services and capital resources before assuming her current role as Senior Director of Financial Planning and Analysis. She previously held positions with Huck International, Inc. and Total Petroleum, Inc. Martha is a CFA charterholder with a bachelor’s degree in communications from the University of Colorado-Boulder and a master’s in finance from the University of Colorado-Denver.
About Fortis
Like UNS Energy, Fortis was established as the publicly traded corporate parent of a local utility – Newfoundland Power – that has provided electric service since the late 1800s. As the company has expanded through a series of acquisitions, it has retained its commitment to disciplined, patient growth through continued focus on operational excellence.
Today, Fortis is the largest investor-owned gas and electric utility in Canada, providing gas and electric service to more than 3 million customers. Its regulated holdings include gas and electric utilities in five Canadian provinces, New York and two Caribbean countries.
Sustainability Performance
UNS Energy has worked with the Edison Electric Institute, the American Gas Association, investors and other member utilities to develop reporting metrics that allow investors to assess environmental, social, and governance risks for each reporting utility. Customers, investors and other stakeholders can view information about our sustainability performance.