Bioenergy, Geothermal

Geothermal Power Plant for New Zealand

ORMAT is proceeding with the design, supply and construction of a second power plant with the capacity of 42 MW and a value of approximately US$44 million in the Mokai Geothermal Field, New Zealand.

Sparks, Nevada – July 11, 2003 [SolarAccess.com] The agreements, signed in August 2002, became effective following completion of the financing arrangements by the project owners. The supply and construction of the Mokai II power plant is planned for completion by April 2005, 22 months after the Notice to Proceed. The 42 MW Mokai II Geothermal Plant is the seventh geothermal power plant designed and constructed by ORMAT in New Zealand and is the second phase at Mokai following the 60 MW Mokai I Plant. Both plants are owned by the Tuaropaki Trust in Taupo, New Zealand.The Mokai I power plant was synchronized to the grid in October 1999 and has been in full commercial operation since February, 2000. The new 42 MW ORMAT Integrated Geothermal Power Plant is to be comprised of one 34 MW ORMAT Combined Cycle module, operating on geothermal steam, and one 8 MW ORMAT Energy Converter unit operating on geothermal brine. This plant will optimize the use of the energy available in the geothermal fluid, by high efficiency utilization of both the high pressure steam and the brine. Efficiency of the Mokai II Plant is projected to be 21 percent, achieved by employing high-efficiency organic vapor turbines, recently developed by ORMAT for geothermal and waste heat recovery applications. The Mokai II Plant is the third ORMAT plant in New Zealand. The others are the 60 MW Mokai I plant and the 27 MW Rotokawa plant, following on the 30 MW Puna, Hawaii and the 130 MW Upper Mahiao, Philippines Geothermal Combined Cycle Unit plants, the latter two plants commissioned in 1992 and 1996 respectively. The two Mokai power plants are the first stages of a modular, phased development, and use approximately 40 percent of the available geothermal resource. The plants operate from a single central control room at the Mokai I plant, creating an integrated project of 102 MW capacity. Both the Mokai I and Mokai II power plants use air-cooled condensers to achieve 100 percent geothermal fluid re-injection, which sustains the reservoir and produces electrical power with virtually no environmental impact.