Business
National Electricity Grid Suffers System Collapse
The Transmission Company of Nigeria (TCN) says a total system collapse of the national electricity grid was recorded on September 28 at 8:03 p.m., resulting in temporary loss of electricity generation for the nation’s power grid.
A statement from TCN’s management in Abuja said that reports obtained from power stations and the sequence of events generated by the Supervisory Control and Data Acquisition (SCADA) had revealed the cause of the collapse.
It said the SCADA system report indicated that the system collapse was triggered by the tripping of Egbin power plants Units ST4, ST6 and ST5.
It however said that restoration of grid system had also commenced at 8:22 p.m. on September 28.
According to the statement, a post mortem analysis of the issue indicated that grid generation was curtailed to about 4,262.7 Mega Watts (MW) before the disturbance.
It explained that the capacity under-utilisation and the operational capability required to maintain grid stability, which had waned made the grid system vulnerable.
It said the vulnerability and disturbance of the system resulted in severe system frequency dip that culminated in the system collapse.
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 further 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.
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