About Star Energy - Geothermal

At Star Energy, we are building a new chapter in UK energy by applying our proven expertise in subsurface engineering and onshore operations to deliver scalable, low-carbon geothermal solutions. While our foundations lie in decades of oil and gas production, our long-term direction is focused on developing and operating commercial geothermal heat infrastructure that supports the UK’s net zero ambitions.

A Track Record in Subsurface Energy Delivery

For over thirty years, Star Energy has played a critical role in the UK’s onshore energy production. Our technical and operational teams have safely explored, developed, and managed oil and gas assets across England, working with a commitment to regulatory compliance, environmental stewardship, and community engagement. Most of our staff live and work within the areas we operate, ensuring that local accountability remains at the heart of our approach. This extensive operational history has equipped us with a deep understanding of subsurface geology, reservoir management, well engineering, and infrastructure delivery. It is these skills—refined through decades of complex oil and gas projects—that now underpin our transition into the geothermal sector.

Transitioning to Geothermal Energy

Geothermal energy is central to Star Energy’s strategic future. In 2020, we acquired GT Energy, a UK-based geothermal development company, to establish a platform for long-term growth in this sector. Since then, we have been focused on developing technically sound, commercially viable geothermal projects across the UK, targeting areas with high heat demand and suitable geological conditions.

Our approach is based on delivering full-cycle geothermal systems, from feasibility and planning through to drilling, installation, and long-term operations. Each project is supported by our in-house engineering and project delivery teams, enabling us to provide an end-to-end service with single-point responsibility.

In August 2023 Star Energy made its first overseas geothermal investment through an acquisition of 51% of A14 Energy Limited (increased to 71% in January 2025) that owns the Ernestinovo exploration licence in the Pannonian Basin in Northern Croatia. The Croatian subsidiary, IGeoPen d.o.o, was then awarded a further two exploration licences at Sječe and Pčelić in October 2023. The exploration licences are based in the Drava depression geological region, which is in the southwestern area of the Pannonian basin.

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Why Geothermal?

The UK has significant untapped geothermal potential. Current estimates suggest that over 360 deep geothermal heating systems could be developed by 2050, providing clean, secure, and baseload thermal energy to homes, hospitals, universities, and industrial estates. Geothermal energy is highly suitable for district heating networks and large-scale users because it delivers continuous thermal output without the intermittency associated with other renewables. When correctly engineered, geothermal systems operate with high capacity factors and require minimal land footprint, offering a stable and long-term heat supply that complements electrification strategies.

Our Geothermal Technology

Star Energy’s geothermal systems are typically based on  a pair of wells or doublet configuration. These systems consist of two wells drilled into saline aquifers at depths of up to 5,000 metres. One well is used to extract hot brine from the subsurface, while the second well reinjects the cooled brine back into the reservoir after its heat has been extracted via a closed-loop heat exchanger at surface.

This configuration provides a sustainable, circular system that preserves reservoir pressure and avoids surface disposal of fluids. The extracted heat is transferred to a secondary water loop, which is then distributed through a heat network to public and private sector consumers. This system can be integrated with other heat sources, thermal stores, or back-up boilers, enabling responsive and resilient heat provision.

Our geothermal wells and surface infrastructure are designed to the highest standards, including compliance with the Borehole Site and Operation Regulations (1995) (BSOR) and relevant guidance from the Environment Agency, the Department for Energy Security and Net Zero (DESNZ), and local planning authorities.

Scalable Project Delivery

Each geothermal project begins with a rigorous assessment and feasibility study to confirm geological viability and economic performance. This includes subsurface modelling, surface heat demand analysis, regulatory engagement, risk assessment, and preliminary infrastructure design. Once feasibility is confirmed, Star Energy leads the consenting process, including securing planning permission, environmental permits, abstraction/reinjection consents, and waste management authorisations. Our team has experience managing these applications under the Town and Country Planning Act, the Environmental Permitting Regulations, and the Water Resources Act.

From there, we deliver the project through detailed engineering, procurement, drilling, and construction management. Our well engineering and construction management teams work in close coordination with regulators and supply chain partners to ensure safe, timely, and cost-effective project delivery. Throughout the project lifecycle, we apply robust quality assurance and health and safety protocols, consistent with our legacy in oil and gas.

Operations and Long-Term Commitment

Star Energy does not simply build geothermal systems; we operate and maintain them over their full lifecycle. This includes equipment commissioning, performance monitoring, asset optimisation, and long-term maintenance planning.

Our operational model is based on performance metrics and service-level agreements to guarantee heat delivery, availability, and safety. We monitor key operating parameters in real time using remote telemetry, and our field teams respond rapidly to maintenance requirements to avoid downtime. As a long-term asset owner and operator, we take responsibility for reservoir performance, equipment longevity, and customer satisfaction. This gives our clients assurance that their geothermal system will continue to deliver consistent value over decades.

Integrated Energy Expertise

While geothermal is our future, Star Energy continues to manage oil and gas assets in line with UK regulations and environmental targets. These legacy assets provide a source of cashflow and operational continuity that supports our investment into renewables.

Our ability to integrate geothermal alongside legacy energy assets is part of what sets Star Energy apart. We apply the same project discipline, technical competence, and regulatory knowledge across both sectors, allowing for a smoother transition and more robust delivery model.

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Looking Ahead

Star Energy’s goal is to become the leading geothermal heat developer and operator in the UK.

With a strong pipeline of opportunities and a proven delivery team, we are well-positioned to support local authorities, NHS trusts, housing developers, and commercial heat users with low-carbon heat solutions that are technically sound, commercially feasible, and environmentally responsible. As the UK decarbonises its heat sector and moves towards net zero, Star Energy is ready to provide a practical, engineered solution that meets today’s heat demands and tomorrow’s climate goals.

A depth of knowledge & experience in the Geothermal arena gives us the edge over competitors

Ross Glover, Chief Executive

Our strategy is to create value for shareholders, employees and communities by being a leading operator of oil and gas assets, renowned for operational excellence and strong safety standards.

Ross Glover, Chief Executive

Geothermal energy is an ideal solution to the urban deployment of renewable energy, geothermal energy.

Ross Glover, Chief Executive

Our Projects - Geothermal

Manchester University NHS Foundation Trust

The Carbon Energy Fund released a tender to select Innovation Partners to work with NHS Trusts across the UK to identify Low Carbon Heat opportunities. We were selected as preferred Partner by the CEF and Manchester University NHS Foundation Trust for the Wythenshawe Hospital.

Manchester Therme Group

Feasibility work for an innovative geothermal geo-exchange solution for the Therme Wellbeing Resort in Trafford Park, Manchester. A trial borehole was drilled and thermal response testing carried out to determine the potential capacity for heat and cooling supplies to the development. This work identified that the Trafford Park area has amongst the highest capacity in the country.

Salisbury NHS Foundation Trust

The Carbon Energy Fund released a tender to select Innovation Partners to work with NHS Trusts across the UK to identify Low Carbon Heat opportunities. We were selected as preferred Partner by the CEF and Salisbury NHS Foundation Trust for the Salisbury Hospital.

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