ENhanced   Geothermal
Innovative Network
for Europe

Hosted by :
  ENGINE Decision Support System


As part of ENGINE techno-economic performance assessment model for deep geothermal projects have been developed. The models have been implemented in EXCEL and as part of dedicated decision support system, using best practices for asset evaluation from the Oil&Gas industry. This approach allows to take into account natural uncertainties and decision trees to evaluate sensitivities and different scenarios.

In the model approach Fast model calculations for the techno-economic evaluation are used to calculate the performance of the geothermal systems, investigating sensitivities of the performance due to both natural uncertainties beyond control (e.g. flow characteristics, subsurface temperatures), engineering options (bore layout and surface facilities options) and economic uncertainties (e.g. electricity price, tax regimes). fast models for the temperature evolution of the water in the well and fractures are based on fast analytical solutions, based on streamline approximations. This allows to calculate in a matter of seconds the performance and its sensitivity to uncertainties and the effect of various engineering options.

The tools are distributed as
- an excel performance assessment spreadsheet: enginePA.xls (2.8 Mo),
- a probabilistic Decision Support System tool: engineDSS.zip (54.6 Mo),
- a methodology and use description detailed in a separate document: enginePA.pdf (4.5 Mo).

BRGM - 3, avenue Claude Guillemin - BP 6009 - 45060 Orléans cedex 2 - France