| Title | Harnessing Geothermal Energy in Antsirabe, Madagascar: A Path Towards Sustainable Development |
|---|---|
| Authors | Claire Bossennec |
| Year | 2026 |
| Conference | World Geothermal Congress |
| Keywords | Geothermal energy, Antsirabe basin, Ankaratra volcanic system, energy transition, sustainable development, Madagascar |
| Abstract | Madagascar hosts ten geothermal regions, categorized into volcanic terrains, fault zones, and sedimentary basins. Among them, the Antsirabe region stands out due to its complex geological setting, where permeable volcanics rocks and fractured sedimentary formations controlled by networks of tectonics fault create favorable conditions for the migration of geothermal fluid. The geothermal reservoir has temperatures between 75°C to 152°C, corresponding to an estimated depth of between 2,4 and 5,5 km . Despite this potential, geothermal resources in Antsirabe remain largely under-exploited with current exploitation limited mainly to direct use of heating applications such as therapeutic baths. This study integrates geological mapping, fracture and fault networks analysis, and hydrothermal investigations to assess the geothermal potential of the Antsirabe basin. The area is shaped by Strombolian volcanic features, basaltic flows, and tectonic structures, especially within the Ankaratra volcanic system. By identifying fluid circulation pathways, reservoir characteristics, and subsurface heat sources, the research aims to develop a comprehensive understanding of the region’s geothermal dynamics. Beyond the geological perspective, this work adopts a multidisciplinary approach by evaluating economic viability and environmental impact. The objective is to propose sustainable models for geothermal development that align with Madagascar's energy needs and climate goals. As the country faces growing challenges from fossil fuel dependency and energy insecurity, the transition toward geothermal energy could play a transformative role in national energy policy. The findings from this study have the potential to catalyse more structured geothermal exploration in the region, contributing to both local and regional sustainable development efforts. |