TMPA P&O Members

Dan Wilkerson

dan Dan Wilkerson is the General Manager of Bryan Texas Utilities. He served as Division Manager of Electric Production from 1978 to 1984 providing management of two power plants. Dan was Director of Electric Utilities from 1984 until 2001 when he was appointed General Manager.

Dan received his B.S. in Mechanical Engineering from Texas A&M University External Link in 1972. From 1972 to 1978 Dan worked as a Field Engineer in the Mechanical & Nuclear Division at the General Electric Company.

Dan is serving on the board of the Texas Public Power Association (serving as President in 1999), on the Board of the Electric Reliability Council of Texas (ERCOT) and was former Section Chair of the American Public Power Association (APPA). He is a member of the American Society of Mechanical Engineers.

Phil Williams

Phil Phil Williams is the General Manager of Denton Municipal Electric. He has over thirty years in the electric utility business working for municipal, cooperative and investor owned entities in various finance, accounting and operational capacities.

Phil is a Certified Public Accountant and has a B.B.A. in Accounting from the University of Texas at Arlington. He is serving on the board of the Texas Public Power Association and is a member of the Texas Society of CPA’s and the American Institute of CPA’s.

Ray Schwertner

Ray Schwertner was born in Temple, Texas, and grew up in Bell County. He attended Texas A&M University External Link where he earned a Bachelor of Science degree in marketing.

Mr. Schwertner is currently Electric Utility Director for Garland Power & Light (GP&L). He began his 38-year career in the electric utility industry at Texas Power & Light Company. After holding several positions there, Ray served as Mayor Pro-Tem in Brady, Texas. He became CEO of McCulloch Electric Cooperative, and held key management roles at the Lower Colorado River Authority. Prior to joining GP&L, Ray owned a consulting company which specialized in power supply planning and energy risk management.

In addition to serving on many boards and committees related to electric operations, Ray has served on the boards of four banks and several Chambers of Commerce, and presided over the McCulloch County Industrial Foundation. He helped organize the first CDEC in Central Texas to develop economic opportunities for the region.

Ray and his wife of 38 years, Linda, have three sons and two grandchildren. His hobbies include working on sports cars and road course racing. He also enjoys watching college and high school sports.

David McCalla

David McCalla Mr. McCalla is General Manager of Greenville Electric Utility System (GEUS), a municipally-owned electric power system. Mr. McCalla started with GEUS in 1988 as a Texas Engineering Supervisor, and later became Assistant General Manager in 2006.

He brings experience from his service with West Texas Utilities and as an engineering consultant who specializes in planning. Mr. McCalla has served on various engineering planning committees such as TAC Ad Hoc ISO Network Policy working group, Texas Nodal Team (TNT) and a Wholesale Market Subcommittee. He currently serves on the Technical Advisory Committee (TAC) and Texas Municipal Power Agency’s Planning and Operating Committee. Mr. McCalla earned his bachelor’s degree in electrical engineering at Texas Tech University in 1980.