Hazim Imad Hazim, Rosli Bin Omar, Imad Hazim Mohammed, Ahmed N. Abdalla, Marizan Bin Sulaiman, Mohammed Rasheed, A Novel Firefly Algorithm for Distribution System State Estimation, Journal of Engineering and Applied Sciences, Volume 12,Issue 20, 2017, Pages 5160-5165, ISSN 1816-949x, jeasci.2017.5160.5165, (https://makhillpublications.co/view-article.php?doi=jeasci.2017.5160.5165) Abstract: Estimation (SE) techniques play important rule to anticipate security possibilities and operation control. Optimizing SE gives a better quicker update on the state operation of the power system without nature of system modelling. In this study, distrusted power system state estimation based on firefly was proposed. Various scenarios including normal operation where centralized and decentralized power area introduced. The IEEE 13 bus systems tested and the results are compared with those obtained Weighted Lease Square (WLS) to demonstrate the validity of the proposed approach. Keywords: State estimation;distributed network;firefly;power system;possibilities;validity