About SO

System Operation (SO) being a semi-autonomous sector under the Transmission Company of Nigeria (TCN) is responsible for operating the transmission system in a safe and reliable manner. The TCN network spreads to all parts of the country and across the border to several neighbouring countries, and Nigeria is a net exporter of power.
The transmission system in Nigeria comprises 330 kV and 132 kV circuits and substations. The thermal generation is located in the south of the country, generally near to the sources of gas, while the hydro generation is located further north at Jebba, Kainji and Shiroro. Distribution is split into 11 zones and the distribution networks comprise 33 kV, 11 kV and low voltage circuits. System nominal frequency is 50 Hz.

Our Connectivity

The transmission system in Nigeria comprises 330 kV and 132 kV circuits and substations.

Core Functions

  • Monitoring system parameters while identifying the requirements for maintaining system reliability and stability
  • Maintaining and enhancing system reliability, stability and security
  • Ensure a stable frequency within the operational limits of 50Hz± - 0.4% with guaranteed quality voltage at all levels and uninterruptible power supply with minimal loss.
  • Conduct system studies, fault analysis, load flow analysis and planning of the power system (real time and future)

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ISO Newsletter

SEP 05
Independent System Operator publishes newsletters on a regular basis to give readers insight and information on the ISO's operations

View Grid Performance

System Performance

Highest Frequency 51.50 Hz
Lowest Frequency 48.79 Hz
Peak Generation 3,970.20 MW
Lowest Generation 3,305.90 MW
Total Energy Sent Out 84,526.70 MWH



Top News

OCT 17
TCN Enlightens Visitors At The Power Nigeria Exhibition

Transmission Company of Nigeria, TCN, participated actively in the recently concluded Power Nigeria Conference and Exhibition which took place at the Eko Hotels, Lagos Island, Lagos State.

AUG 22
Market Operation (MO) Gets Acting Executive Director

Mr. Moshood Ayinde Saleeman has been appointed the Acting Executive Director (Market Operation) in the Independent System Operation, ISO...

AUG 22
ISO Gets An Acting Managing Director

Engr. Musa Musa Gumel has been appointed the Acting Managing Director of the Independent System Operation (ISO), a Business Unit of the Transmission Company of Nigeria (TCN)

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