Many modern power management concepts involve Active Power Filters and Energy Storage Systems; the former focuses on improving power quality while the latter aims at power balance management through storing energy. Active Power Filters complement and are somewhere lower in hierarchy compared to energy storage systems which help maintain integrity of electrical systems by eliminating harmonics and stabilizing voltage levels. The latter (Energy Storage Systems) aids in the ability to meet the supply and demand requirement, storing energy for later which is optimal for integrating renewable energy systems. It is important for energy sector players to appreciate the differences and uses of these technologies as it will facilitate effective operational decision making in line with sustainability targets.