This paper presents a review on common sources of inaccuracy related to solving the non-convex economic
dispatch problem. The inaccuracies originate from using invalidated cost function, inaccurate
calculation of transmission losses, violating equality or inequality constraints, comparing the performance
of different algorithms based on different modeling equations, and comparing the results with
different variants of benchmark systems. Numerous observations of unintended inaccuracies reported in
previous published research work are used to illustrate the each argument; however, only few variants
of benchmark test systems were sufficient to demonstrate and explain the existence of inaccuracies. The
observed inaccuracies presented in this paper are explained, and the corresponding accurate results are
presented to be used as standards in the future research.