The Transmission Company (TCN), said the National grid has experienced a total system collapse recorded on September 28, at 8.03pm, which was said to be triggered by the tripping of Egbin power plants Units ST4, ST6 and ST5.
According to a statement released by the TCN’s management on Friday in Abuja, reports obtained from power station and sequence of events generated by the Supervisory Council and Data Acquisition (SCDA) , states that a postmodern analysis of the issue indicated that grid generation was curtailed to about 4,262.7Mega watts(7MW) before the disturbance.
It said the system became vulnerable after the capacity under-utilisation and operational capability required to maintain grid stability had waned.
It further revealed that the analysis conducted clearly showed that there was insufficient level of rotating reserve provided by grid-connected generation companies arising from low tariffs for providing ancillary services.
It said TCN had filed an application to the Nigerian Electricity Regulatory Commission (NERC) for an extraordinary tariff review to avert another occurrence of such incident.
It said the proposal for a tariff review would ensure that Generation Companies (GENCOS) were given the necessary incentives to provide sufficient spinning reserves and other ancillary services critical for managing the national grid.
“TCN hereby solicits for the understanding of all Nigerians as it continues with efforts to provide the electricity industry with a world-class national grid.
“It will strive to ensure that the stride attained recently in frequency control is sustained in line with world industry standards and codes,“ the statement further stated.
It, however, said that restoration of a grid system had also commenced at 8.227pm on September 28, 2017.