Nigeria’s Power Grid Expands As TCN Network Reaches 18,600km Transmission Line Length
Nigeria’s electricity transmission infrastructure continues to expand, with the latest data from the Transmission Company of Nigeria (TCN) showing significant growth in the national grid’s capacity and network coverage as of May 2026.
Updated transmission figures indicate that TCN now operates 57 transmission substations at 330kV and 186 substations at 132kV, supported by 496 power transformers nationwide.
The company’s installed transformer capacity stands at 17,636MVA on the 330kV network and 22,820.5MVA on the 132kV network.
The transmission network comprises 92 transmission line circuits at 330kV and 215 circuits at 132kV, with a combined transmission line length of over 18,667 kilometres.
The 330kV network spans 9,946.81km with a wheeling capacity of 64,995MW, while the 132kV network covers 8,721km with a capacity of 17,215.25MW.
The data further reveals that TCN operates through 10 regional offices, 31 sub-regions and 10 work centres across the country, underscoring the scale of Nigeria’s transmission infrastructure.
The updated figures complement recent industry reports highlighting efforts to strengthen the national grid, reduce transmission losses and improve power delivery across the Nigerian Electricity Supply Industry (NESI).
Recent regulatory directives have also tasked TCN with further improving transmission efficiency by the end of 2026.
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