Mokai Geothermal Power Plant, New Zealand
Key Data:
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
Output
60MW expanded to 100MW
Plant type
Geothermal
Location
Mokai, around 25km NW of Taupo
Estimated investment
$40 million for 60MW to 100MW expansion
Key Players:
Owner
Tuaropaki Trust
Operator
Tuaropaki Power Company
Turnkey contractor and equipment supplier
ORMAT group of companies
Financing
Westpac Banking Corporation
Well drilling and testing
Century Drilling
Mokai geothermal structures
Fletcher Construction (FCC)
Operation and maintenance
Mighty River Power
Plant Details:
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%
Output
11kV, 3 phase, 50Hz, power factor 0.85 (lagging), 97.5% efficient
