Science and Education Publishing American Journal of Electrical and Electronic Engineering 2 1 2014 01 10 (Lantool) Power Generation Cost Minimization Software Application 21 26 EN Anireh V.I.E. Department of Electrical/Computer Engineering, Rivers State University of Science and Technology, Rivers State, Nigeria John Tarilanyo Afa AJEEE2014215 10.12691/ajeee-2-1-5 2013 09 29 2013 12 25 2014 01 10 Managers of large scale industry like the electricity generation are challenged at many fronts because the tasks involved are complex, influenced by unexpected events and evolve in time. Currently the application of computer methods in this industry has produced tremendous positive results. In this regard, the study presents an effort developed to solve optimal power flow (economic dispatch) problem by minimizing the cost of generation using the lagrangian multiplier method. A decision support system "Lantool" is presented. The approach is validated by lagrangian method found in technical literatures. The system will assist operators in thermal power plants with the task of planning generation in the most economic way. A result obtained from the application explains the important role decision support systems can play in the management of the electricity generation industry.