Wairakei Power Station – New Zealand. Plant Modifications arising from Operational Deficiencies, Technology Advances and Life Extension Studies

Abstract

The Wairakei Geothermal Power Station has had a remarkable generation history since machine commissioning through the period 1958 to 1963. The paper discusses some of the plant design constraints, the early reputation of the plant and learning experiences from over 50 years of operation. Plant deficiencies have been identified and analysed, plant maintenance processes have changed, life extension studies have been completed and technology advances have occurred through the decades. Modifications to the plant and maintenance practices have been made enabling the Wairakei steam turbine plant to achieve high availability, low forced outage factors, high plant load factors and an enviable 50 years of production service from the original plant. The paper discusses selected aspects and modifications to the plant that have contributed to 50 years of outstanding service from the Wairakei Geothermal Power Station.