Nigeria’s electricity sector was down to zero power
transmission across the country as at Thursday evening at 8.03 pm due to
tripping of Egbin Units ST4, ST6 and ST5, respectively.
According to a statement, Friday, by the management of
Transmission Company of Nigeria, TCN: “Reports obtained from Stations and the
sequence of events generated by the SCADA system indicated that the system
collapse was triggered by the tripping of Egbin Units ST4, ST6 and ST5 at
‘20:03:15, 20:03:32 and 20:03:34’ respectively.
“By this incident, the Nigerian electric power grid lost
generation completely before restoration commenced at 20:22Hrs.
“A post mortem analysis of the event indicated that grid
generation was curtailed (to about 4,262.7MW) prior to the inception of the
disturbance due to capacity under-utilization and the operational capability
required to maintain grid stability had waned, leaving the system vulnerable to
the extent that perturbations of this magnitude resulted in severe system
frequency dip that culminated in system collapse.
“The analysis clearly indicated that there was insufficient
level of spinning reserve provided by grid-connected generation companies
arising from low tariffs for providing ancillary services.
“In order to avert such incidence on a sustainable basis,
the Transmission Company of Nigeria Plc has filed an application to the
Nigerian Electricity Regulatory Commission for an extraordinary tariff review
as a means of ensuring that generation companies are incentivized to provide
sufficient spinning reserves and other ancillary services that are critical for
managing the national grid.
“The Transmission Company of Nigeria Plc hereby solicits for
the understanding of all Nigerians as we continue with our efforts to provide
the electricity industry with a world class national grid. “On our part, we
will strive to ensure that the stride attained recently in frequency control is
sustained in line with world industry standards and codes.”
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