This paper presents the development of the Satigny 2&3 geothermal doublet, part of Geneva’s GEothermies program led by the Canton of Geneva and Services Industriels de Genève (SIG). Located in a key industrial zone, this is the first industrial-scale geothermal installation in the region targeting medium-depth aquifers. Designed for integration with the GeniTerre district heating network, the system will deliver 7 MW of thermal output — 2 MW through the direct use of geothermal heat via a primary heat exchanger, and 5 MW via a heat pump system connected to a secondary exchanger. The project also explores the potential for seasonal thermal storage, whereby excess summer heat could be injected into the reservoir and recovered during winter to enhance efficiency. With construction scheduled to begin in 2026 and commissioning expected in 2029, the Satigny doublet marks a major step in Geneva’s renewable energy strategy and offers a replicable model for sustainable geothermal development in urban settings.