The company owns and operates the hydroelectric generating stations on the Waikato River as well as geothermal plants in the Taupo area, the gas fired (combined cycle) Southdown plant in south Auckland and the largely unused plant (Marsden A and Marsden B) at Marsden Point near Whangarei.
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Atiamuri Power Station is a hydroelectric power station on the Waikato River owned by Mighty River Power.
Southdown is also extensively used during dry periods, when there is insufficient water to run Mighty River Power's eight hydroelectric power stations on the Waikato River at full capacity.