Abstract: The blackouts occurring in a power system is one of the most significant problems which is dealt by the supply utilities in today’s power system networks. A lot of factors lead to the occurrence of blackouts; overloading of transmission lines, ice coating on them, protection and control system failures being the most prominent ones. Adoption of certain control strategies like N-1 contingency, maintaining load generation balance and cascade to more fault contingencies can be very effective to reduce power system blackouts. The following paper puts forward a review study about blackouts from different countries, their causes and their solutions. The following paper can provide important references to grid protection strategies.