• Tuesday, June 18, 2024
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Gas, faulty infrastructure limit power generation – TCN

The power sector conundrum

The Transmission Company of Nigeria (TCN) on Tuesday said gas constraints and faulty power plants have led to the persistent low generation and load allocation to distribution companies (DisCos) nationwide.

Speaking on the current load shedding being experienced nationwide, Ndidi Mbah, the general manager, public affairs division of the TCN, said the company can only transmit what is being generated by generation companies which, according to her, is currently below capacity.

“TCN does not generate electricity and, therefore, can only transport cumulative generation from all the generation companies to distribution load centres.

“The distribution companies are responsible for end-user consumption. TCN allocates power to distribution companies based on an approved percentage (formula approved by NERC), of the total generation available per hour or on the day-ahead nomination.

“Presently, the cumulative generation nationwide is low and generation companies have attributed this to several factors including poor gas supply, fault in generating units of generating companies, scheduled and unscheduled maintenance, all of which have caused most power generating companies to limit their generation, and sometimes not generate at all,” she said.

According to her, a summary of the power generating profiles in the last two months shows that fourteen (14) gas-powered generating stations were either not generating at all or had limited generation at various times within the period which further depleted the quantum of power generation available for transmission into the grid on a daily basis.

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Power generating stations in this category include; Omotosho units 5 & 6, Olorunsogo units 3, 4 & 6, Omoku units 3 & 6, Omotosho NIPP units 3 & 4, Delta units 15, 17, and 18, Afam VI units 11 & 12, Olorunsogo NIPP unit 3, Ihovbor NIPP unit 2, Sapele Steam unit 3, Sapele NIPP unit 1, Odukpani NIPP units 1 & 3, and Okpai units 11, 12 & 18.

She also noted that within the same period, Jebba Hydro and Shiroro Power Generating Stations were either out or had limited generation, causing additional loss of 232MW from the grid.

“Other power generating plants such as Omotosho units 3&4, Olorunsogo units 1, Delta units 10 &20, Afam VI unit 13, Ihovbor NIPP units 4, Geregu NIPP units 22&23 and Odukpani NIPP units 2, 4 & 5, have also been out either on fault or for scheduled maintenance, causing a further loss of about 3,180MW from the grid.

“A combination of the above scenarios has persisted and the total effect on the grid is persistent low generation, which TCN operators have had to strive to dispatch in a way that will not jeopardise the stability of the grid.

“From March 1- 4, 2022, there was generation shortfall due to water management in Shiroro and Jebba hydro with the loss of 307MW and 125MW respectively from both stations. Within the same period, there were fault and technical problems in Egbin, causing 514MW shortfall and in Geregu causing 230MW shortfall, while reported fault at Alaoji NIPP reduced generation from the substation by 263MW.

“Gas constraint alone in Olorunsogo gas generating plant reduced generation from the station by 104MW. In the same vein, Omotosho gas lost 102MW and Sapele NIPP lost 263MW. In Omotosho NIPP, there was a generation shortfall of 233MW and in Omoku a shortfall of 112MW. Two units in Okpai have limited generation due to technical problems causing a 204MW drop in generation and in Afam VI 511MW drop in generation.

“Gas constraint and fault in Olorunsogo NIPP reduced generation by 240MW, Geregu NIPP by 435MW, and Ihovbor by 142MW. Also, due to gas pipeline pigging, Odukpani NIPP was SHUT DOWN which caused a reduction of generation by 575MW,” she said.

She further noted that except cumulative power generation increases considerably for TCN to transmit to distribution companies nationwide, TCN will be left with no choice but to continue to load shed.