Document Type : Research Note


Faculty of Engineering, University of Mohaghegh Ardabili, P. O. Box: 56199-13131, Ardabil, Ardabil, Iran


Geothermal energy is a non-carbon renewable source from the earth's internal energy. This energy is considered reliable today and has a high potential to reduce the threat of climate change. The main factor that any investor wants to invest in any natural energy source is the resulting economy. In the case of geothermal energy, factors that increase the risk of investing in this sector include higher investment costs, longer payback times than other renewable power plants, and the uncertainty of the size and quality of the resources before the completion of the well drilling operation. The average payback time in geothermal energy systems is 5.7 years, longer than wind and solar energy. According to these factors, the risk of investing in geothermal technology increases. On the other hand, due to its independence from oil and gas, it increases a country's energy security, helps to create direct, indirect, and induced employment, and affects other economic sectors. Also, unlike renewable wind and solar energies, it is not dependent on climate change; therefore, it has higher reliability than other renewable energies. Also, by combining this energy with other renewable energies, its performance can be optimized. For example, in an optimal geothermal-solar hybrid power plant, solar energy provides 48 % of the total energy. In this case, the Levelized Cost of Energy (LCOE) is reduced from 225 $ per MWh (only with geothermal source) to 165 $ per MWh. In this study, while studying the economic effects of geothermal systems, an attempt has been made to address the challenges in this field and present the policies implemented in some countries. It is implied that by providing incentive policies and an appropriate roadmap, it is possible to help attract investment in the operation of geothermal systems.


Main Subjects

  1. Wang, H., "International Energy Agency, World Energy Outlook (IEA WEO) Peer review panel global energy & petrochemical investment cost reviews commentaries to the IEA WEO Team in IEA HQ in January 2014", IEA HQ, Paris, France, (2014). (
  2. Haghighi, A., Pakatchian, M.R., Assad, M.E.H., Duy, V.N. and Alhuyi Nazari, M., "A review on geothermal Organic Rankine cycles: Modeling and optimization", Journal of Thermal Analysis and Calorimetry, Vol. 144, No. 5, (2021), 1799-1814. (
  3. Johansson, T.B. and Goldemberg, J., "Energy for sustainable development: A policy agenda", United Nations Publications, (2002), 219. (
  4. Wolf, C., Klein, D., Richter, K. and Weber-Blaschke, G., "Environmental effects of shifts in a regional heating mix through variations in the utilization of solid biofuels", Journal of Environmental Management, Vol. 177, (2016), 177-191. (
  5. Günther, M. and Hellmann, T., "International environmental agreements for local and global pollution", Journal of Environmental Economics and Management, Vol. 81, (2017), 38-58. (
  6. Soltani, M., Kashkooli, F.M., Dehghani-Sanij, A., Kazemi, A., Bordbar, N., Farshchi, M., Elmi, M., Gharali, K. and Dusseault, M.B., "A comprehensive study of geothermal heating and cooling systems", Sustainable Cities and Society, Vol. 44, (2019), 793-818. (
  7. Pan, S.-Y., Gao, M., Shah, K.J., Zheng, J., Pei, S.L. and Chiang, P.C., "Establishment of enhanced geothermal energy utilization plans: Barriers and strategies", Renewable Energy, Vol. 132, (2019), 19-32. (
  8. El Haj Assad, M., Aryanfar, Y., Javaherian, A., Khosravi, A., Aghaei, K., Hosseinzadeh, S., Pabon, J. and Mahmoudi, S.M.S., "Energy, exergy, economic and exergoenvironmental analyses of transcritical CO2 cycle powered by single flash geothermal power plant", International Journal of Low-Carbon Technologies, Vol. 16, No. 4, (2021), 1504-1518. (
  9. Khosravi, A., Syri, S., Zhao, X. and El Haj Assad, M., "An artificial intelligence approach for thermodynamic modeling of geothermal based-organic Rankine cycle equipped with solar system", Geothermics, Vol. 80, (2019), 138-154. (
  10. El Haj Assad, M., Ahmadi, M.H., Sadeghzadeh, M., Yassin, A. and Issakhov, A., "Renewable hybrid energy systems using geothermal energy: Hybrid solar thermal–geothermal power plant", International Journal of Low-Carbon Technologies, Vol. 16, No. 2, (2021), 518-530. (
  11. El Haj Assad, M., Aryanfar, Y., Radman, S., Yousef, B. and Pakatchian, M., "Energy and exergy analyses of single flash geothermal power plant at optimum separator temperature", International Journal of Low Carbon Technology, (2021). (
  12. El Haj Assad, M., Sadeghzadeh, M., Ahmadi, M.H., Al‐Shabi, M., Albawab, M., Anvari‐Moghaddam, A. and Bani Hani, E., "Space cooling using geothermal single‐effect water/lithium bromide absorption chiller", Energy Science & Engineering, Vol. 9, No. 10, (2021), 1747-1760. (
  13. Gunnarsson, G. and Aradottir, E.S.P., "The deep roots of geothermal systems in volcanic areas: Boundary conditions and heat sources in reservoir modeling", Journal Transport in Porous Media, Vol. 108, (2015), 43-59. (
  14. Anderson, A. and Rezaie B., "Geothermal technology: Trends and potential role in a sustainable future", Applied Energy, Vol. 248, (2019), 18-34. (
  15. Dowling, A.W., Zheng, T. and Zavala, V.M., "Economic assessment of concentrated solar power technologies: A review", Renewable and Sustainable Energy Reviewers, Vol. 72, No. 10, (2017), 19-32. (
  16. Sheu, E.J., Mitsos, A., Eter, A.A., Mokheimer, E.M.A., Habib, M.A. and Al-Qutub, A., "A review of hybrid solar-fossil fuel power generation systems and performance metrics", Journal of Solar Energy Engineering, Vol. 134, No. 4, (2012). (
  17. Stefansson, V., "Investment cost for geothermal power plants", Geothermics, Vol. 31, (2002), 263-272. (
  18. Goh, Y.M.F, Kong, H.L. and Wang, C.H., "Simulation of the delivery of doxorubicin to hepatoma", Pharmaceutical Research, Vol. 18, (2001), 761-770. (
  19. Williamson, J.I., "The future of US geothermal development: Alternative energy or green pipe dream", Texas Journal of Oil, Gas, and Energy Law, Vol. 7, No. 1, (2011). (
  20. Lukawski, M.Z., Anderson, B.J., Augustine, C., Capuano Jr., L.E., Beckers, K.F., Livesay, B. and Tester, J.W., "Cost analysis of oil, gas, and geothermal well drilling", Journal of Petroleum Science and Engineering, Vol. 118, (2014), 1-14. (
  21. Yost, K., Valentin, A. and Einstein, H.H., "Estimating cost and time of wellbore drilling for Engineered Geothermal Systems (EGS)–Considering uncertainties", Geothermics, Vol. 53, (2015), 85-99. (
  22. Hance, C.N., "Factors affecting costs of geothermal power development", Geothermal Energy Association, Department of Energy, USA, (2005). (
  23. IRENA | International Renewable Energy Agency, "Renewable power generation costs in 2017", (2017). (
  24. Li, K., Bian, H., Liu, C., Zhang, D. and Yang, Y., "Comparison of geothermal with solar and wind power generation systems", Renewable and Sustainanbe Energy Reviewers, Vol. 42, (2015), 1464-1474. (
  25. Zhou, C., Doroodchi, E. and Moghtaderi, B., "An in-depth assessment of hybrid solar–geothermal power generation", Energy Conversion and Management, Vol. 74, (2013), 88-101. (
  26. Alaica, A.A. and Dworkin, S.B., "Characterizing the effect of an off-peak ground pre-cool control strategy on hybrid ground source heat pump systems
    ", Energy and Buildings, Vol. 137, (2017), 46-59. (
  27. Toselli, D., Heberle, F. and Brüggemann, D., "Techno-economic analysis of hybrid binary cycles with geothermal energy and biogas waste heat recovery", Energies, Vol. 12, (2019), 19-69. (
  28. Gehringer, M. and Loksha, V., "Geothermal handbook: Planning and financing power generation, A pre-launch", (2012). (
  29. Speer, B., Economy, R., Lowder, T., Schwabe, P. and Regenthal, S., "Geothermal exploration policy mechanisms: Lessons for the United States from international applications", National Renewable Energy Laboratory (NREL), United States, (2014). (
  30. Ziagos, J., Phillips, B.R., Boyd, L., Jelacic, A., Stillman, G. and Hass, E., "A technology roadmap for strategic development of enhanced geothermal systems", Proceedings of the 38th Workshop on Geothermal Reservoir Engineering, Stanford, CA, Citeseer, (2013), 11-13. (
  31. Beerepoot, M., "Technology roadmap: Geothermal heat and power", Renewable Energy Division, International Energy Agency, OECD/IEA, Paris, (2011), (
  32. Nitsch, J., Pregger, T., Naegler, T., Heide, D., de Tena, D.L., Trieb, F., Scholz, Y., Nienhaus, K., Gerhardt, N. and Sterner, M., "Langfristszenarien und strategien für den ausbau der erneuerbaren energien in Deutschland bei berücksichtigung der entwicklung in Europa und global", Schlussbericht im Auftragdes BMU, bearbeitet von DLR (Stuttgart), Fraunhofer IWES (Kassel) und IfNE (Teltow), (2012), 345. (
  33. Agemar, T., Weber, J. and Schulz, R., "Deep geothermal energy production in Germany", Energies, Vol. 7, (2014), 4397-4416. (
  34. Evans, K., Wieland, U., Wiemer, S. and Giardini, D., "Deep Geothermal Energy R&D Roadmap for Switzerland, 2014", Economic Modelling, Vol. 16, No. 7, (2014). (
  35. Cataldi, R., Grassi, W. and Passaleva, G., "Outlook on geothermal power development in Italy by 2050: Up or down?", (2015). (
  36. Manzella, A., Donato, A., Gola, G., Santilano, A. and Trumpy, E., "The Italian challenge for geothermal energy", Perspectives for Geothermal Energy in Europe, World Scientific, (2017), 127-155. (
  37. Dumas, P., "Policy and regulatory aspects of geothermal energy: A European perspective", Manzella, A., Allansdottir, A. and Pellizzone, A. (eds.), Geothermal energy and society, Lecture notes in energy, Vol 67., Springer, (2019), 19-37. (
  38. Manzella, A., Allansdottir, A. and Pellizzone, A., Geothermal energy and society, Lecture notes in energy, Vol 67., Springer, (2019). (
  39. Zhu, J., Hu, K., Lu, X., Huang, X., Liu, K. and Wu, X., "A review of geothermal energy resources, development, and applications in China: Current status and prospects", Energy, Vol. 93, (2015), 466-483. (
  40. Nouraliee, J., Satkin, M., Bina, F.A., Ebrahimi, D. and Sheikholeslami, F., "Introducing the second version (2020) of geothermal potential map of Iran", Proceedings of World Geothermal Congress, (2020). (
  41. Nouraliee, J., Ebrahimi, D., Dashti, A., Korzani, M.G. and Sangin, S., "Appraising Mahallat geothermal region using thermal surveying data accompanied by the geological, geochemical and gravity analyses", Scientific Reports, Vol. 11, No. 1, (2021), 1-14. (
  42. Noorollahi, Y., Shabbir, M.S., Siddiqi, A.F., Ilyashenko, L.K. and Ahmadi, E., "Review of two decade geothermal energy development in Iran, benefits, challenges, and future policy", Geothermics, Vol. 77, (2019), 257-266. (
  43. Behnam, S. and Khalajmasoumi. M., "A futuristic review for evaluation of geothermal potentials using fuzzy logic and binary index overlay in GIS environment", Renewable and Sustainable Energy Reviews, Vol. 43, (2015), 818-831. (
  44. Noorollahi, Y., Fotouh, M. and Barnett, P., "Geothermal energy in Iran", GRC Bulletin, (2000). (
  45. Saffarzadeh, A. and Noorollahi, Y., "Geothermal development in Iran: A country update", Proceedings of World Geothermal Congress, (2005). (
  46. Yousefi, H., Ehara, S. and Noorollahi, Y., "Geothermal potential site selection using GIS in Iran", Proceedings of the 32nd Workshop on Geothermal Reservoir Engineering, Stanford University, Stanford, California, (2007), 174-182. (
  47. Yousefi, H. and Ehara, S., "Geothermal power plant site selection using gis in Sabalan area, NW Iran", Department of Earth Resources Engineering, Kyushu University, (2007), 819. (
  48. Noorollahi, Y., Yousefi, H., Itoi, R. and Ehara, S., "Geothermal energy resources and development in Iran", Renewable and Sustainable Energy Reviews, Vol. 13, (2009), 1127-1132. (
  49. Najafi, G. and Ghobadian, B., "Geothermal resources in Iran: The sustainable future", Renewable and Sustainable Energy Reviews, Vol. 15, (2011), 3946-3951. (
  50. Tofigh, A.A. and Abedian, M., "Analysis of energy status in Iran for designing sustainable energy roadmap", Renewable and Sustainable Energy Reviews, Vol. 57, (2016), 1296-1306. (
  51. Seyedrahimi-Niaraq, M., Ardejani, F.D., Noorollahi, Y. and Porkhial, S., "Development of an updated geothermal reservoir conceptual model for NW Sabalan geothermal field, Iran", Geothermal Energy, Vol. 5, No. 14, (2017), 1-22. (
  52. Seyedrahimi-Niaraq, M., Ardejani, F.D., Noorollahi, Y., Porkhial, S., Itoi, R. and Nasrabadi, S.J., "A three-dimensional numerical model to simulate Iranian NW Sabalan geothermal system", Geothermics, Vol. 77, (2019), 42-61. (
  53. Seyedrahimi-Niaraq, M., Ardejani, F.D., Noorollahi, Y., Nasrabadi, S.J. and Hekmatnejad, A., "An unsaturated three-dimensional model of fluid flow and heat transfer in NW Sabalan geothermal reservoir", Geothermics, Vol. 77, (2021), 1-19. (
  54. Seyedrahimi-Niaraq, M., Bina, S.M. and Itoi, R., "Numerical and thermodynamic modeling for estimating production capacity of NW Sabalan geothermal field, Iran", Geothermics, Vol. 90, (2021), 1-21. (
  55. SATBA | Renewable Energy and Energy Efficiency Organization, Renewable Energy in Iran, (2018), (Retrieved: 15 May 2018). (
  56. Song, Y. and Lee, T.J., "Geothermal development in the Republic of Korea: Country update 2010-2014", Proceedings of World Geothermal Congress, (2015), 19-25. (
  57. KETEP | Korea Institute of Energy Technology Evaluation and Planning, Strategic roadmap for greenhouse gas reduction technology – Geothermal, Ministry of Knowledge Economy, (in Korean), (2017). (
  58. Kato, Y., Koyama, M., Fukushima, Y. and Nakagaki, T., Energy technology roadmaps of Japan, (2016). (
  59. Pambudi, N.A., "Geothermal power generation in Indonesia, a country within the ring of fire: Current status, future development and policy", Renewable and Sustainable Energy Reviews, Vol. 81, (2018), 2893-2901. (