Dr. Charles A. Stigers, P.E.

Principal Power Systems Engineer

Academic Background

  • Taught undergraduate Physics 1969-1973
  • Ph.D. (Physics), University of Arkansas; Fayetteville, AR, 1970
  • MS (Physics), University of Arkansas; Fayetteville, AR, 1967
  • BA (Mathematics), William Jewell College; Liberty, MO, 1964 

Professional Experience

Dr. Charles Stigers is an engineering professional with a strong technical background and a deep understanding of the electrical utility industry. Dr. Stigers has over 40 years of experience in power system engineering including: distribution feeder analysis, sub-regional transmission analysis, large scale transmission power flow analysis, large scale transmission stability analysis, Sub-Synchronous Resonance (SSR) analysis, transient switching analysis, Special Protection System (SPS) development, and application development including writing some code. Dr. Stigers joined Utility System Efficiencies, Inc. (USE) in July 2011. At USE, Dr. Stigers has completed a variety of power flow and transient switching analysis studies using PSSE.

While employed at Northwestern Energy (NWE) Dr. Stigers conducted the following programming work:

  • From 2001 through 2011 participated in many Generator Interconnection study efforts. Some of these were performed by Dr. Stigers, and others involved supervising or consulting as others performed the actual study work.
  • Self-taught FORTRAN programmer. He also has written applications in several other languages.
  • In 1974 wrote a program capable producing a Bill-of-Materials for distribution feeders that Montana Power used for budget estimates.
  • In 1983 re-wrote a widely available program for computing Steady State Sub-Synchronous Resonance Frequency Response to expand the capabilities of this program. He then used his modified version of that program to perform studies on the Colstrip transmission system.
  • Has written (or re-written) a number other FORTRAN programs for the preparation of power-flow data as needed by MPC over the years.
  • Has written several command-language programs, using various languages including the C-shell language (often used on UNIX computers). Presently writes C-shell programs to automate studies.