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Aaron W. Worthman

Partner, CPA
512 975 7281

Aaron Worthman, partner on the energy and utilities team, has been with Baker Tilly Virchow Krause, LLP since 1998. He specializes in serving municipal utilities and joint action agencies. His experience includes performing financial audits and agreed upon procedure reviews as well as preparing rate studies, cost of service studies, rate designs and financial forecasts.


  • Manages financial audits of numerous municipal electric, water, sewer and stormwater utilities as well as joint action agencies
  • Provides OMB Uniform Guidance compliance audits of federally funded programs
  • Reviews and tests internal controls of the administration of grant programs
  • Analyzes the financial impact of construction projects on utility customer rates, borrowing needs and operational results
  • Prepares electric, water, sewer and stormwater rate filings, cost of service studies and rate design
  • Testifies as an expert witness before regulating agencies and local governing bodies to support utility rate adjustments
  • Prepares annual budgets and long-range financial forecasts for municipal utilities
  • Assists with negotiation of retail utility service agreements related to large industrial developments and intergovernmental agreements


  • American Institute of Certified Public Accountants (AICPA)
  • American Public Power Association (APPA)
  • Northwest Public Power Association
  • Texas Public Power Association
  • Texas Society of Certified Public Accountants Austin Chapter
  • Wisconsin Institute of Certified Public Accountants (WICPA)

Thought Leadership

  • Speaks on accounting and financial reporting topics at national and regional conferences as well as at Baker Tilly sponsored seminars
  • Teaches utility education courses for the APPA
  • Authors nationally and regionally published articles on utility regulation and accounting issues


University of Wisconsin ‒ Eau Claire
Bachelor of Business Administration

Continuing Education

  • AICPA, national governmental and not-for-profit training session
  • Baker Tilly, Electric cost of service and rate design
  • Baker Tilly, Single audit training sessions
  • Baker Tilly, Utility re-engineering audit update
  • Baker Tilly, Utility training seminar
  • WICPA, Governmental Financial Management Update
  • Wisconsin Rural Water Association, The business of running your utility