Colombia Approves Exploratory Phase of Ecopetrol-Led Nereidas Geothermal Project in Caldas Province

Colombia's environment ministry has approved the environmental viability of the exploratory phase of the Nereidas geothermal project, led by state oil company Ecopetrol alongside Baker Hughes and utility CHEC, in a milestone that could establish geothermal energy as a new source of round-the-clock renewable power in the Andean country. The project is located in the Ruiz volcanic massif in Caldas province and represents Colombia's first large-scale geothermal exploration initiative, with a potential generation capacity of between 50 and 100 megawatts that could serve more than 250,000 families. The ministry also issued new environmental terms of reference for geothermal exploration and exploitation projects, setting out technical, environmental and social requirements for the sector.

 

The Strategic Case for Geothermal in Colombia

 

Colombia currently relies on hydropower for roughly two-thirds to 70 percent of its electricity generation, a dependence that creates structural vulnerability to rainfall variability and increasingly to climate-driven drought conditions. Geothermal energy offers a low-emissions source of baseload electricity with a generation profile that is entirely independent of precipitation, providing system reliability that hydropower alone cannot guarantee during prolonged dry spells. For a country that has experienced significant power supply stress during drought years, the development of a geothermal resource would fundamentally improve the resilience of the national electricity system.

The Ruiz volcanic massif provides Colombia with one of the most promising geothermal resources in South America, given the heat flows associated with the region's active volcanic geology. Ecopetrol's participation brings extensive subsurface drilling expertise from its oil and gas operations, while Baker Hughes contributes drilling technology capabilities and CHEC provides power sector integration and distribution experience. This combination of technical disciplines across the partnership addresses the interdisciplinary challenges of geothermal development, which requires deep well drilling, reservoir characterisation and power generation integration.

 

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Environmental Approvals and Land Use Conditions

 

The environment ministry granted a partial and conditional carve-out from a protected forest reserve area outside national parks, limited specifically to exploration work and subject to environmental safeguards, ecological restoration and water management requirements. The conditionality of the approval reflects the sensitivity of the Ruiz volcanic massif as an ecologically significant area requiring careful management alongside geothermal development activities. By restricting the initial approval to the exploration phase and attaching specific environmental and social requirements, the ministry has established a framework that allows the project to proceed while preserving the ability to impose additional conditions or restrictions at the exploitation stage.

The simultaneous issuance of new sectoral environmental terms of reference for geothermal projects is significant beyond the Nereidas approval itself. By establishing clear technical, environmental and social requirements applicable across the sector, the ministry has provided a regulatory framework that can support additional geothermal exploration applications from other developers. This policy development transforms the Nereidas approval from an isolated decision into the foundation of a broader geothermal sector regulatory framework for Colombia.

 

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Outlook for Colombian Geothermal Development

 

The Nereidas exploration approval marks the beginning of a multi-year development pathway that will require drilling, reservoir testing and feasibility assessment before any decision on commercial exploitation can be made. If the exploration phase confirms commercially viable geothermal resources within the expected capacity range of 50 to 100 megawatts, Nereidas could become the first geothermal power plant in Colombia and a reference case for further development across the country's volcanic resource base. The exploration results will be closely watched by other energy developers, investors and policymakers evaluating the long-term potential of geothermal in Colombia's energy mix.

The broader significance of the project extends beyond its direct generating capacity to the precedent it sets for diversifying Colombia's renewable energy portfolio beyond hydropower and the rapidly growing solar and wind segments. Round-the-clock firm renewable power is increasingly valued as variable renewable penetration rises, and geothermal is one of the few technologies capable of providing this without storage. Sustained progress on the Nereidas project could catalyse further geothermal investment across Colombia and potentially across the broader Andean region where volcanic geology offers similar resource potential.