Classically, the aim of the electric power system is to generate electrical energy and to deliver this energy to the end-user equipment at an acceptable voltage. As nonlinear loads draw harmonic and reactive power components of current from ac mains, the quality of power deteriorates. This paper presents a review of the main power quality (PQ) problems with their associated causes and solutions with codes and standards. This paper concludes with some solutions to mitigate the Power Quality problems are presented.