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Assessment of the Costs of Geothermal Power Generation in New Zealand 9. Summary and Conclusions There are a number of general conclusions that can be made from this study with regard to the applicability of the various power cycle types for various reservoir conditions, cost efficiencies and thermal performance, as follows: at each reservoir temperature, the required real electricity tariff of single flash, double flash and hybrid cycle plants of both 20 and 50 MW capacity are within 0.8 NZc.kWh-1 of one another for the high and low well productivity envelopes, but the ORC options are approximately 0.8 to 1.8 NZc.kWh-1 above this range at reservoir temperatures around 230 oC and high well productivity, the gap between the ORC option and the other three options still exists, but has reduced to approximately 0.7 NZc.kWh-1. From the modelling studies undertaken herein, and importantly, based on the assumptions made for reservoir and well flow characteristics and the various commercial parameters used in the financial modelling (notably interest rate, loan term, debt to equity, discount rate and inflation rate), it is concluded that the geothermal developments in New Zealand in 2007 could have been undertaken within the following envelopes for capital costs and Year 0 electricity tariffs: 300 oC / 50MW plant size: – cost of single flash plant < hybrid = double flash << ORC – mean capital cost estimations (and specific capital costs) vary from NZD 188 M (3,750 per kW) for a single flash steam plant to NZD 198 M (4,000 per kW) for a double flash steam plant to NZD 204 M (4,050 per kW) for a hybrid plant and to NZD 241 M (4,850 per kW) for a standalone ORC plant. Mean values for the double flash plant and hybrid options are very similar – Year 0 required electricity tariff. High productivity: 7.3 to 8.0 NZc.kWh-1 for single flash, double flash and hybrid, 9.6 NZc.kWh-1 for ORC. Low productivity: 8.5 to 9.5 NZc.kWh-1 for single flash, double flash and hybrid, 11.1 NZc.kWh-1 for ORC. 260 oC / 50MW plant size: – cost of single flash < hybrid = double flash << ORC – mean capital cost estimations (and specific capital costs) vary from NZD 215 M (4,300 per kW) for a single flash steam plant to NZD 222 M (4,450 per kW) for a hybrid plant to NZD 227 M (4,550 per kW) for a double flash steam plant and to NZD 264 M (5,300 per kW) for a standalone ORC plant. Mean values for the double flash plant and hybrid options are very similar Sinclair Knight Merz. SKM Cost of Geothermal Power Report (2007 Cost Basis)R1.doc PAGE 62PDF Image | Current Costs of Geothermal Power Generation in New Zealand
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