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Table 1.
Key financial and pumping model assumptions (adapted from Wang et al. [6]).
| Key financial assumptions | |
| Project lifetime | 20–30 years |
| Cost of capital (nominal) | 8% |
| Inflation rate based on current Australia CPI | 2.7% |
| Corporate tax rate based on current Australia taxation scheme | 30% |
| Depreciation | Straight line, no residual value |
| Federal government funding for proof of concept | 50% of well costs capped at $7 Million AUD, up front12. |
| State government funding implemented over 5 years’ time | $1 matches every $3 project expenditure capped at $5.4 M13. |
| Projected electricity price increase | 2.7% |
| Carbon tax based on current Australian taxation office | $23 / tonne CO2 |
| Carbon price increase | 4% per year |
| Make-up water price increase | 16% in 2012 14% in 2013 10% in 2014 and 5% onwards |
| Drainage water price increase | 1.8% per year |
| Pumping model assumptions | |
| Yarragadee aquifer permeability | 0.1–0.7 Darcy |
| Temperature gradient | 25 °C per km |
| Geothermal well screen height | 200 m |
| Injection pump efficiency | 80% |
| Submersible pump efficiency for the production well | 65% |
| Distance between production and injection wells | 800 m |
| Well diameter | 250 mm |
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