This paper presents a proposed procedure depends on the multi-objective fuzzy linear programming (MFLP) technique to obtain the optimal reactive power reserve for generators and static switchable VAr sources, as a preventive control action to overcome any emergency condition. The proposed procedure is very significant to eliminate violation constraints and give an optimal reactive power reserve for multioperating conditions. The proposed multi-objective functions are: minimizing the real transmission losses, maximizing the reactive power reserve at certain generator, maximizing the reactive power reserve at all generation system and/or switchable VAr devices. The proposed MFLP is applied to a 5-bus test system and the West Delta region system as a part of the Egyptian Unified network. The numerical results show
that the proposed MFLP technique achieves a feasible real power loss with maximal reactive reserve for power systems.