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Assessment of the Costs of Geothermal Power Generation in New Zealand 4. Geothermal Development Scenarios and Assumptions A number of generic geothermal development scenarios, typical of the New Zealand geothermal environment, are developed for this study, based on the following considerations. 4.1 Resource Characteristics A number of physical characteristics of developed and undeveloped geothermal resources which may be available for development in New Zealand are given in Table 4.1. These data show that, for fields likely to be developed, maximum resource temperatures at currently drilled depths in the natural state range from 230 to 330oC with an average value of around 280oC. Table 4-1 Field Ngatamariki Summary of Key Resource Parameters, NZ Geothermal Fields Total area of resource km2 12 20 40 8 16 18 9 Rotoma 5 Maximum temperature oC# 280 280 315 250 326 300 230 240 280 307 330 271 300 Number of deep wells 7 0 54 4 ~20 16 1 1 0 ~62 8 >50 8 Maximum Stored Installed drilled Heat Capacity depth Potential m MWe* MWe 2700 120 0 ~100 200 0 2500 450 132 3000 45 0 ~2500 140 111 2255 160 25 1338 40 0 1450 35 0 ~200 240 0 2418 130 92 3000 300 165 2255 510 230 ~2500 320 0 Totals 2690 755 Tokaanu‐ Waihi Kawerau Mangakino Mokai Ngawha Reporoa Tikitere‐ Taheke Ohaaki 35 Rotokawa Wairakei Tauhara * at 90% load factor over 50 years # values in italics are inferred 10 20 25 35 Areas and stored heat estimates in Table 4.1 are derived from the estimates in Lawless (2005) with the exception of the stored heat estimate for Ngawha which has been updated to better reflect the actual binary-only power scheme there (which means the basis is not exactly the same as the other fields). Following Lawless (2005), the stored heat capacities take no account of possible Sinclair Knight Merz SKM Cost of Geothermal Power Report (2007 Cost Basis)R1.doc PAGE 12PDF Image | Current Costs of Geothermal Power Generation in New Zealand
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