Geothermal drilling is by far the major element of cost in any geothermal project. This is particularly true for deep Engineered Geothermal Systems (EGS) in hot dry rocks where the costs increase due to increased drilling distances, tripping times and harsher environments. According to an estimate, drillings costs alone can contribute to about 30-70% of the overall project development expenditure for a deep geothermal project — costs associated with use of expensive drilling rigs, drilling times including time spent to tackle drilling wear and trouble-shooting.
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