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Assessment of the Costs of Geothermal Power Generation in New Zealand Mokai I (59MW), Mokai II (39 MW) and Mokai 1A (expansion which involves a retrofit of a larger non condensing steam turbine at the Mokai I plant) The Mokai II plant was committed in 2003 at a cost of NZD 90 million for the power plant and steamfield piping requirements (equal to USD 52 million at the exchange rate prevailing at that time) for a gross output of 40 MW18. This gives a specific capital cost of about NZD 2,200. kW-1 after correction for inflation and exchange rate changes. Rotokawa I Plant This 24 MW GCCU plant was commissioned in 1996 at a cost of USD 34 million which included supply and installation of both steamfield piping plus power plant. Assuming an annual cost increase of 2.5% per annum from 1996 to 2007 (10 years) and converting the adjusted USD to NZD at an exchange rate of 0.70 indicates a similar size development in 2007 would cost about NZD 6319 million, representing an installed cost of about NZD 2,600.kW-1. For the purposes of the present study costs for hybrid steam + binary cycle plant are assessed as follows, supplied under an EPC contract, the scope of which is comparable to the other cycles considered. Provision for major spare parts is included in the EPC price: Table 6-6 Plant Size Estimated Costs for Hybrid Steam + Binary Cycle Power Plant (2007) 20 MW 50 MW Estimated Total Cost NZD per kW installed 2,600 2,200 Estimated Total Cost USD per kW installed (E/R 0.70) 1,820 1,610 Local Cost Component NZD M 10.4 23.0 Overseas Cost Component USD M (E/R 0.70) 29.1 64.4 6.5 Transmission Interconnection Costs The geothermal power plant is assumed to be located in the vicinity of the national 220 kV transmission network. Transmission of 20 to 50 MW at 110 kV is technically and economically feasible, but consideration of this would not provide a sufficiently conservative cost. A reliable arrangement for the interconnection of a power plant to an existing transmission line is through the deviation of the transmission line into the power plant switchyard. The cost of a 20 km 18 NZ Herald, 11 August 2003 19 =34*(1.025)^10/0.70 Sinclair Knight Merz SKM Cost of Geothermal Power Report (2007 Cost Basis)R1.doc PAGE 32PDF Image | Current Costs of Geothermal Power Generation in New Zealand
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