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Energy produced from the generating stations is transmitted to VRA power sale customers through an interconnected transmission network at 69, 161 and 225kV voltage levels. The existing transmission network comprises:
The transmission grid comprises a matrix of substations and transmission lines. It includes over 4,000 kilometers of high voltage transmission lines operating at 161kV and 69kV and the interconnection to Cote d'Ivoire at 225kV.
The on-going implementation of 330kV projects will see 330kV replacing 161kV as the primary transmission voltage. The transmission lines are linked to 43 primary substations (transformation and switching substations) with total installed transformer capacity of 2,630MVA. Electricity supply voltage is reduced at these substations to 34.5kV, 11.5kV, 6.6kV, etc., for supply to bulk supply customers and/or for onward distribution to end-users.
The Ghana power network is also interconnected with the power grids of neighbouring Cote d'Ivoire (CIE), Togo and Benin (CEB). A Map of the transmission grid is shown below:
|330 kV||429 km|
|161 kV||4,193.36 km|
|225 kV||74.3 km|
|69 kV||138.8 km|
|No. of Transformers||103|
|Transformer Capacity||3,870.86 MVA|
|No. of Transformer/Switching Substations||53|
|Largest switching Substation is Volta substation||Tema|
|Transformer Substations||330/161kV 161/69kV 161/34.5kV 161/11.5kV Stations|