Geoffrey joined NREL in October 2023 and is a Geoscience researcher in the Thermal Energy Science and Technologies Group. He has 13 years of experience in the geothermal industry working in borehole geology, geothermal exploration, conceptual modeling, and well targeting. He earned his doctorate from the University of Iceland, focusing on petrology, geochemistry, and volcanology. Previously, he worked as a geologist for the Geothermal Development Company in Kenya.
Research Interests
Geothermal resource conceptual modeling
Geothermal reservoir assessment
Techno-economic analysis
Geothermal energy development
Geothermal data analysis
Play fairway analysis
Geochemistry of geothermal fluids
Deep drilling research
Education
Ph.D., Geology, University of Iceland
M.S., Geology, University of Nairobi
B.S., University of Nairobi
Professional Experience
Scientist, Deep-Sea Geophysical research project, University of Iceland, and University of Hawaii joint project (2019)
Geothermal Training Instructor, Geothermal Development Company and UNU-GTP (2017-2022)
Conceptual Modeling and Well Site Targeting Geologist, Geothermal Development Company (2014-2023)
Lead Geologist, Ngozi Geothermal Project, Geothermal Development Company (2014-2016)
Borehole Geologist, Paka and Menengai Geothermal Drilling Project, Geothermal Development Company (2010-2023)
Exploration Geologist, Paka-Korosi Geothermal Project, Geothermal Development Company (2010-2023)
Associations and Memberships
Geothermal Association of Kenya (GAK)
Fellow, United Nations University Geothermal Training Program (UNU-GTP)
Geological Society of Kenya
Featured Work
DE-Risking Exploration for geothermal Plays in magmatic ENvironments (DEEPEN): Conceptual Models and Indicators of Superhot Geothermal Systems in Magmatic Settings, NREL Technical Report (in preparation)
Rapid shifting of a deep magmatic source at Fagradalsfjall volcano, Iceland, Nature (2022)
Reservoir Characterization of the Paka Geothermal System in Kenya: Insights From Borehole PK-01, Geothermics (2021)
Eruptive history and volcano-tectonic evolution of Paka volcanic complex in the northern Kenya rift: Insights into the geothermal heat source, Journal of African Earth Sciences (2021)
Continental rifting at magmatic centres: structural implications from the Late Quaternary Menengai Caldera, central Kenya Rift, Journal of the Geological Society (2020)
An updated geothermal model, power capacity estimates and financial model for resource development in Paka geothermal field, First EAGE Workshop on Geothermal Energy and Hydropower in Africa (2020)
The Use of Leapfrog Software in Geothermal Conceptual Modelling; Case Study of Menengai Geothermal Field, Geothermal Resource Council Transactions (2017)
Bentonite deposits in Kenya as drilling mud, Geothermal Resource Council Transactions (2011)
Awards and Honors
Ph.D. Fellowship Award, United Nations University Geothermal Training Program (2017)
Best Presentation Award, Geothermal Resource Council (2017)
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