Navajo Tribal Utility Authority – an enterprise of the Navajo Nation


NTUA Board Chairperson
Sidney B. Dietz II, Berkeley, California

Mr. Dietz is a regulatory lobbyist for Pacific Gas & Electric in San Francisco specializing in energy efficiency, natural gas, and public purpose programs. He is a doctoral candidate in Energy and Resources at the University of California at Berkeley. He has a Master of Science Degree in Energy and Resources, and a Bachelor's Degree in Physics from UC Berkeley. Chairman Dietz was formerly manager of the Navajo Nation Air Quality Control Program where he led the development of the major source regulations and the creation of a certified air quality monitoring system, a first for the Navajo Nation.
William H. Clagett, Lone Tree, Colorado

Mr. Clagett brings to the NTUA Board a wealth of experience in the utility industry. He was the Administrator with the Western Area Power Administration and served as a past Assistant Administrator for the Bonneville Power Administration office in state of Washington. He also served as chairman of the North American Electric Reliability Council and as chairman of Western Systems Coordination Council. Currently, Mr. Clagett is the president of A1 Mat, Inc., a consulting firm in Colorado. His field of expertise includes transmission system studies, wholesale customer service engineering design, power contract negotiations, and transmission design standards.
Wynette R. Arviso

Ms. Wynette R. Arviso brings to NTUA more than 25 years of experience in management consulting, including organizational leadership, project management, and effective communications. She has provided professional management services to community and organizational development, with expertise in land planning and geospatial analysis. She currently owns and manages her own consulting firm. She attended and graduated from the University of Oklahoma with a Bachelor’s of Science in petroleum engineering, and a Master’s of Science in Industrial Engineering. She also holds a Master’s of Advanced Studies in Geographical Information Systems from Arizona State University.
Belinda P. Eriacho,Tempe, Arizona

Ms. Eriacho has more than 26 years of experience in environmental, health and safety management. She is employed with Pinnacle West Capital Corporation in Phoenix where she serves as the Environmental, Health, and Safety Audit Leader. Her job focuses on compliance with federal, state, and local environmental, health, safety and Department of Transportation laws and regulations, advising the company on its scope of responsibility. She holds a Bachelor of Science Degree in Health Sciences, a Master's Degree in Technology, and a Master's Degree in Public Health.
Robert (Bob) Roessel

Mr. Robert (Bob) Roessel, a Professional Engineer, is originally from Round Rock, Arizona, and was appointed to the NTUA board with nearly 35 years of utility experience having worked with the Salt River Project based in Tempe, Arizona. He brings to NTUA his knowledge in Governmental Relations/Intergovernmental Affairs, including Transmission and Distribution Capital Project Implementation and Engineering/Construction Project Management. He is a graduate of the University of New Mexico with a Bachelor’s of Science in Civil Engineering. As member of the Navajo Nation, he hopes to use his expertise to help the Nation become more self-sufficient.
Raymond Holgate

Raymond Holgate is originally from the Shonto area. He joins the NTUA Management Board bringing his expertise and background in electrical engineering. He is a graduate of Northern Arizona University with a Bachelor of Science degree in electrical engineering. Currently he is supervising the Electrical Engineering Department at the Navajo Generating Station (NGS) in Page, Arizona. His department provides technical support to the Operation and Maintenance of NGS. His department oversees plant improvements and develops ten year plans to maintain plant reliability. He has also worked with the Salt River Project as a Senior Engineer, providing technical direction and engineering support. He is of the Lok'aa'dine'e (Reed People clan) and born for the Todich'ii'nii (the Bitter Water clan). His maternal grandparent clan is Tabaaha (the Water's Edge clan) and his paternal grandfather clan is Tachii'nii (the Red Running into the Water people clan).
Alton Joe Shepherd

Alton Joe Shepherd is a Navajo Nation Council Delegate and is a member of the 23nd Navajo Nation Council. He was appointed to the NTUA Management Board by the NN Council Resources and Development Committee of the Navajo Nation Council. He serves as Chairman of the NN Resources and Development Committee. He represents chapters in the Fort Defiance agency, including Jeddito, Cornfields, Ganado, Kinlichee, and Steamboat chapters. Chairman Shepherd originally from Steamboat, AZ . His Navajo clans are: Tábąąhá (maternal) and born for Tséńjíkiní (paternal clan); his maternal grandfather’s clan is Mąˊii deeshgiizhinni and his paternal grandfather’s clan is Tłˊízí lání.