Transmission Outages Force Power Cuts in Lagos, Abuja, North — NISO


The Nigerian Independent System Operator (NISO) has attributed recent reductions in electricity allocations to Distribution Companies (DisCos) serving Lagos, Abuja and parts of Northern Nigeria to multiple transmission line outages and network constraints.

NISO said the adjustments were necessary to keep the national grid operating within secure limits, stressing that the availability of electricity generation does not automatically guarantee that power can be transmitted to areas where it is needed.

In a clarification issued on Sunday, the system operator explained that power transfers depended largely on the availability, capacity and configuration of transmission infrastructure.

According to NISO, the Lagos axis suffered a major reduction in transmission capacity following successive outages on the Olorunsogo–Ayede 330kV Line 1, Benin–Egbin 330kV Line 1 and Benin–Omotosho 330kV Line 1, as well as the prolonged outage of the Osogbo–Ikeja West circuit.

The development, it said, forced a review and curtailment of power allocations to the Eko Electricity Distribution Company (EKEDC), Ikeja Electric and the Sakete international supply.

NISO said the Northern corridor also came under severe pressure following the tripping of the Shiroro–Mararaba 330kV Line 1 between August 24 and 26, which affected power supply to Abuja and other parts of the North.

The situation worsened on August 27 when the Shiroro–Mando 330kV Line 2 and Mando–Jos 330kV Line 1 reportedly tripped simultaneously.

The Mando–Jos line was, at the time, the only available transmission circuit serving Jos and the North-East, as the Apir–Lafia 330kV Lines 1 and 2 had remained out of service due to faults.

NISO said the simultaneous outages significantly reduced power supply to Jos and the North-East, while the separation of a bus at the Mando Transmission Substation further altered the network configuration.

Consequently, allocations to Kano, Kaduna, Jos, Yola and other affected areas were curtailed to prevent wider disturbances on the national grid.

The Abuja axis was similarly affected on August 29 when the Shiroro–Katampe 330kV Line 1 and Gwagwalada–Katampe 330kV Line 1 tripped simultaneously at about 3:55 a.m.

However, NISO said both circuits were restored shortly after 7 a.m., allowing transmission capacity to the Federal Capital Territory to recover.

The operator maintained that the recent changes in electricity allocations were caused by transmission constraints rather than inadequate generation.

It said: “Generation availability does not automatically translate into deliverable power to Distribution Companies. Adequate transmission capacity and a secure network configuration are equally essential.”

NISO explained that it could be compelled to redispatch generation, curtail load or revise allocations to DisCos whenever transmission constraints threaten the stability of the interconnected electricity network.

The operator said the clarification had become necessary to set the records straight and give Nigerians a clearer understanding of the circumstances behind the recent changes in electricity supply across the affected corridors.

This is contained in a statement issued and signed by the management of NISO

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