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Martyn River Power Station is a hydroelectric power station owned by Trustpower. The power is generated at 400V and then stepped up to 11kV at the power station and it has a 66kV transmission line between the 11/66kV step up substation across Martyn river and Transpower's Royal Oak GXP that has 4 66/11kV transformer banks located behind the building containing 2 110/33kV transformers.
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