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Across Europe, the subsurface is increasingly being recognised as a strategic asset that is critical for energy transition, resource security and environmental resilience. At the heart of efforts to harness this potential is the (GSEU), a major pan-European initiative working closely with national geological surveys such as ���ճԹ�. Together, we are reshaping how geological knowledge is generated, shared and applied for societal benefit.

A shared European vision beneath our feet

Launched in 2022 under Horizon Europe, GSEU aims to establish a permanent geological service for Europe. Its core premise is simple yet transformative: geological challenges do not stop at national borders and therefore must be addressed through harmonised data and collaboration.

Through a partnership of nearly 50 organisations across more than 35 countries, GSEU is developing integrated pan-European datasets and services that address Europe’s most pressing challenges, such as:

• securing the critical raw materials needed for green technologies
• managing groundwater resources under increasing climate pressure
• expanding renewable energy solutions, including geothermal
• planning subsurface use
• coastal management to avoid conflicts between infrastructure, storage and environmental protection

Rather than treating these domains separately, GSEU recognises that they interact within a complex and interconnected subsurface system that requires a holistic and coordinated approach to support policymaking, environmental protection and the transition to a low-carbon economy. Through shared standards, interoperable data models and coordinated research agendas, GSEU aims to create a unified geological knowledge base capable of supporting these goals.

From data to knowledge: the power of publications

One of the most tangible outputs of GSEU is its growing body of open-access publications that translate complex geoscientific work into actionable knowledge. The showcases a diverse range of outputs, such as scientific papers, factsheets and strategic position papers.

Recent highlights include:

• a , emphasising the need for coordinated approaches to achieve resilience and strategic autonomy
• scientific studies advancing the understanding of , including deposit mapping and predictive modelling approaches
• practical factsheets on and , supporting evidence-based environmental management
• the , a strategic roadmap outlining the long-term vision for a sustainable geological service across Europe
• the Geo-Assessment Matrix, a pan-European catalogue of key parameters for offshore wind farm siting

These publications form part of a broader effort to move beyond isolated datasets and towards the integrated (EGDI), a platform that makes harmonised geological data accessible for research, policy and industry.

The role of ���ճԹ�

As the UK’s national geological survey, ���ճԹ� is a key contributor to GSEU. Our involvement reflects a longstanding commitment to international collaboration and data sharing. Through GSEU, our scientists contribute expertise in areas such as:

• critical raw materials and resource assessment
• groundwater systems, including leadership in groundwater drought and trend analysis
• geothermal energy and geoenergy systems
• subsurface storage
• coastal vulnerability assessment
• offshore renewable energy, including task leadership in developing pan-European geological datasets and methodologies for offshore windfarm siting, stability assessment and marine spatial planning
• geological data harmonisation and modelling

This breadth of involvement ensures that UK expertise is embedded within the development of interoperable, pan-European datasets and services.

Another example of ���ճԹ�’s contribution is the European CO₂ Storage Atlas, which was developed through GSEU and launched in May 2025. By integrating geological datasets and subsurface characterisation from across Europe, the atlas provides a harmonised assessment of carbon dioxide (CO₂) storage capacity and injectivity potential, demonstrating how detailed national expertise, including petrophysical and rock physics insights, can be translated into a coherent framework to support carbon capture and storage deployment at European scale.

���ճԹ� played a key role through its leadership in UK storage assessments and is continuing this work through the recently launched , funded by the European Union. Over the next three years, CO2SITE will develop an open-access atlas of CO₂ storage opportunities across Europe, bringing together the geological, regulatory and other data needed to help advance projects towards implementation. As a key project partner, ���ճԹ� will develop the database underpinning the CO2SITE atlas, providing an important resource for researchers, policymakers and investors to support informed decision making on geological CO₂ storage.

More broadly, ���ճԹ� continues to deliver high-impact science that feeds into international initiatives, such as new findings on the formation timeline of the Giant’s Causeway, and developments in national geothermal data resources. Together, these contributions reinforce ���ճԹ�’s role as a trusted provider of high-quality geoscientific knowledge.

Initiatives like GSEU are essential, because geology does not stop at borders. By understanding that continuity is key to tackling shared challenges and building a common knowledge base, we can support decisions that balance energy needs, environmental protection and long-term sustainability across Europe.

Audrey Ougier-Simonin, project lead at ���ճԹ�.

Collaboration in action

Beyond data integration, the project is actively strengthening professional networks, firstly by bringing together all Europe’s national geological surveys through and now enabling new forms of collaboration.

These include:

• research exchanges and short-term visits, such as collaboration with TNO (Netherlands) researchers
• student placements, including visiting researchers from organisations such as IGME (Spain)
• development of joint proposals and future research initiatives, building on new relationships formed through GSEU

Looking ahead

As Europe navigates the complexities of the energy transition and environmental change, initiatives like GSEU will be indispensable. By transforming fragmented geological data into a coherent, accessible and actionable resource, they are enabling better decisions at every level, from local land-use planning to EU-wide policy.

The message emerging from both GSEU publications and community engagement is clear: understanding the subsurface is key to building a resilient and sustainable future. Through continued collaboration, innovation and knowledge sharing, Europe is steadily bringing that future into focus.