Mobilising a Time-Critical Open Loop Geothermal Scheme for an NHS Estate

This project is being mobilised for an NHS Trust in Southeast London, where an open loop geothermal system is being developed to support estate decarbonisation.

For NHS estates, decarbonisation projects like this sit at the intersection of operational pressure, public accountability and fixed funding timelines. Solutions need to be viable, deliverable and clearly understood - not just in design, but in how they will be installed and managed within a live healthcare environment.

Delivering Decarbonisation Under Real-World Constraints

Drift was brought into a project on an NHS estate in London at a critical stage.  

The scheme had previously been awarded to another contractor, but concerns around planning, communication and design led the Trust to retender. That decision created immediate time pressure, with funding deadlines already in place.

Restoring Confidence and Programme Certainty

The immediate priority was to stabilise the project and move it forward with clarity.

Working alongside the NHS Trust, its consultants and the Principal Contractor, Drift helped redefine the scope and delivery strategy for Phase 1.

The first phase comprises:

• One abstraction borehole
• One reinjection borehole
• Two shallow groundwater monitoring wells

The objective is to prove the performance of the chalk aquifer and provide the technical evidence required to support Phase 2, which has the potential to deliver a significantly larger open loop geothermal system capable of replacing gas-based heating across the estate.

Delivering Against Tight Funding Deadlines

The challenge on this project extends well beyond drilling boreholes.

Design development, planning approvals and mobilisation have all been progressed in parallel to maintain programme momentum and protect funding deadlines. Maintaining that pace while preserving engineering quality has been central to the project's success.

For publicly funded infrastructure projects, programme certainty is often just as important as technical delivery.

Managing a Live NHS Estate and Public Environment

The site itself presents further complexity.

Located adjacent to a busy public park, Ladywell Fields, the works require careful management of public access, stakeholder engagement and local impact throughout construction.

This has included:

• Public engagement meetings to address community concerns.
• Coordination with park users and local stakeholders.
• Ongoing communication with neighbouring businesses, including a café operating within the park.
• Traffic management designed to minimise disruption while maintaining safe and efficient site operations.

Delivering infrastructure in this type of environment demands careful planning long before drilling begins.

Engineering Within a Framework of Governance

Like many NHS decarbonisation projects, the scheme operates within a framework of funding governance, regulatory oversight and multiple project stakeholders.

That requires communication, coordination and programme control beyond standard construction delivery, ensuring the Trust, consultants, Principal Contractor and delivery team remain aligned throughout the project.

Proving the Resource

Drilling is now underway, with the immediate objective of generating the hydrogeological data required to confirm the site's suitability for open loop geothermal.

If Phase 1 performs as expected, Phase 2 will expand the system significantly, forming a key part of the Trust's long-term strategy to decarbonise its heating infrastructure.

More Than a Drilling Contractor

This project demonstrates Drift's ability to step into a live scheme, restore confidence and quickly move from uncertainty to structured delivery.

By combining hydrogeological expertise, programme management and practical engineering, we have helped keep a time-critical NHS decarbonisation project on track while successfully managing funding constraints, public interface and technical delivery simultaneously.

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