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Mokai Geothermal Power Plant

Notice to proceed, 60MW plant

February 1998

Delivery of 60MW turbine-generator

February 1999

60MW turbine commissioned

December 1999

40MW expansion

Completion expected April 2005


60MW expanded to 100MW

Plant type



Mokai, around 25km NW of Taupo

Estimated investment

$40 million for 60MW to 100MW expansion


Tuaropaki Trust


Tuaropaki Power Company

Turnkey contractor and equipment supplier

ORMAT group of companies


Westpac Banking Corporation

Well drilling and testing

Century Drilling

Mokai geothermal structures

Fletcher Construction (FCC)

Operation and maintenance

Mighty River Power

60MW Level 1 Steam turbine and generator

Steam turbine type GE multi stage, single cylinder reaction

60MW steam units

Steam inlet pressure 18.6bar(a), steam outlet pressure 1.3bar(a), speed 3,000rpm

60MW generators

Rated output 32MW

Level II Ormat Energy Converter

2-stage organic vapour turbine (motive fluid pentane), impulse speed 1,500rpm, efficiency 97%


11kV, 3 phase, 50Hz, power factor 0.85 (lagging), 97.5% efficient

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