Power supply to Abuja, Lagos and several northern states has dropped following a series of transmission line failures that disrupted electricity distribution across parts of the country.
The Nigerian Independent System Operator (NISO) said the disruptions were caused by multiple faults on critical transmission lines, forcing the system operator to reduce allocations to electricity distribution companies to maintain the stability of the national grid.
According to NISO, the Shiroro-Mararaba transmission line was unavailable between August 24 and 26, affecting a major electricity supply route serving Abuja and northern parts of the country.
The operator said the Shiroro-Mando and Mando-Jos transmission lines also tripped during the period, further weakening the network.
NISO explained that the backup circuits connecting Apir and Lafia had already been out of service for an extended period due to faults, leaving Jos and parts of the North-East with severely limited transmission supply.
The situation was further compounded by a bus separation at the Mando substation, which disrupted electricity supply to Kano, Kaduna, Jos, Yola and other northern areas.
The system operator said it was responding by re-dispatching available generation and adjusting allocations to distribution companies to prevent further instability on the national grid.
NISO assured electricity consumers that it would continue taking operational measures to protect the grid from wider disturbances while efforts are made to restore affected transmission facilities.
