Arapuni Power Station is a hydroelectric power station on the Waikato River, in the North Island of New Zealand. It is the seventh and penultimate hydroelectric power station on the Waikato River. It is also the oldest currently generating, the first government-built, and the largest single hydroelectric power station on the Waikato River.
Arapuni, due to its proximity to Hamilton, plays an important part in voltage support and frequency keeping in the city and the wider Waikato River. Even though it is 80 years old, continuous improvement and refurbishment of the station's generation equipment ensures Arapuni remains efficient.
The powerhouse and dam at Arapuni are under protection of the Historic Places Trust, becoming Category I Historic Places in November 1987 and August 1991 respectively. It is one of the few generating power stations in New Zealand to be listed on the register.
Arapuni is operated by the publicly listed company Mighty River Power, who is predominately an electricity generation company.
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