The main objective of given subject to sniff out all sorts of coherence problems of electrical power system which never been implicated since last decade by implementing new emerging technology. This has been comprehended from all demesne of electrical system operation from generation to end users of power system. In addition, it also expatiate the existing facilities of transmission & distribution how have been worked out. Somehow, the said subject also would suggest the management to review the existing policies and procedures, which need to be updated as per today’s technology requirements. Furthermore it will endure the immense details for operating and managing staffs how to get the rid of any problems which are difficult to asses the criterion because of lack of instrumental tools whether it relate to work force or any technical hitches. This compendium has been accent to bring real problems for management acknowledgement for quality operation, reliability assurance & cost reduction factors. Insofar is will provide right direction to take effectualness action to obdurate any unnecessary unpredicted down time of the any transmission or distribution system. It will also render us with ample theoretically details with phenomenal principally undergo any research and development. In additionally, we have accentuated all relevant information to develop generation, transmission & distributions clampdown or restrains, which are normally averting to get quality operation. This is our great pleasure to do constructive work for our esteem nation enthusiastically and potentially for facilities improvement and cheapest power delivery without any sorts of transit. Probably, FACTS is stand for the Flexible Alternate current transmission system. This system has been developed from last decade in electrical power engineering & technology with fostering accomplishments. FACTS devices have been elaborated successfully in power transmission/distribution business with high reliability to prevent any operational constraints/contingencies.