Deep geothermal potential of Møre and Romsdal

Abstract

This study presents an evaluation of the deep geothermal energy potential of Møre & Romsdal County based on an integrated analysis of geological, geophysical, and thermal datasets. The research integrates borehole temperature logs, laboratory-measured rock properties, heat flow density estimates, and regional tectonic features to perform a 3D thermal modelling. The results indicate that temperatures increase from inland areas toward the coast and offshore regions, where sedimentary insulation enhances the geothermal gradient. Key controlling factors include lithospheric thickness, crustal radiogenic heat production, groundwater flow dynamics, and the insulating effect of low-conductivity sediments. Offshore areas exhibit the highest geothermal potential, with temperatures at 5 km depth reaching ~150°C, sufficient for electricity generation. In contrast, mainland temperatures at similar depths remain lower (~124°C at 5 km), making them more suitable for direct heat applications rather than power production. The study also identifies structural complexities as a critical issue for accurate thermal modelling. The results support the possibility of deep geothermal energy as a sustainable alternative to fossil fuels, particularly near coastal urban areas and offshore hydrocarbon platforms. Future work should refine the 3D thermal model with higher-resolution data and assess fluid flow dynamics to optimize geothermal resources assessment. This research contributes to regional and national energy strategies, supporting Norway’s transition toward renewable energy with future reducing greenhouse gas emissions.