Current Costs of Geothermal Power Generation in New Zealand

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Current Costs of Geothermal Power Generation in New Zealand ( current-costs-geothermal-power-generation-new-zealand )

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Assessment of the Costs of Geothermal Power Generation in New Zealand For geothermal developments in the size range of 20 to 50 MW in an otherwise undeveloped field, annual production well decline rates of 3% are typical. This value has been assumed in this study to predict M&R requirements. An example of a decline analysis is given in Figure 5-2 for development Option # 19 from Table 5-2 with 5 production wells initially required at start up. A further 6 M& R wells are predicted to be required throughout the 30 year production life with the timing of individual wells as indicated. This M&R well sequence for Option # 19 would allow for production from the field to be maintained at 10% above the power plant requirement from Operational Year 1 to Year 30, providing a buffer should a production well require to be taken offline for maintenance purposes. 30.0 25.0 20.0 15.0 10.0 5.0 M& R Well Requirment for 20MWe Option # 19 10% production margin maintained up to year 30 4 M&R production wells plus 3 M&R reinjection wells (total 9 production wells and 6 reinjection wells throughout the project life) ` - 1 6 11 16 21 26 31 36 Operational Years Figure 5-2 Example of Harmonic Decline Analysis Sinclair Knight Merz SKM Cost of Geothermal Power Report (2007 Cost Basis)R1.doc PAGE 24 Field Output (MW)

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