Geothermal Energy Feasibility Studies

At Star Energy, we specialise in delivering structured, evidence-led geothermal feasibility studies for organisations considering deep geothermal heating as part of their energy strategy. Our service is designed to assess whether a geothermal resource exists beneath a given site, determine its technical viability, and evaluate whether it can be developed into a secure and commercially competitive long-term heat supply.

Our Energy Feasibility Studies

Geothermal heat has the potential to provide large-scale, stable, and low-carbon energy for decades. However, confirming whether a site can support a viable system requires detailed analysis of subsurface conditions, surface infrastructure needs, planning and regulatory requirements, and long-term economic performance. Our feasibility studies are designed to give clients a clear, risk-managed pathway from concept through to potential construction. We follow a phased development model based on established subsurface energy workflows, adapted to suit the needs of our clients in the public and private sectors. Our methodology is divided into distinct stages: Scoping, Feasibility (Select), Design, Finalise, and Execute, allowing projects to move forward in manageable steps, with each stage providing the evidence needed to justify the next.

Phase 1: Scoping

The Scoping phase lays the groundwork for assessing geothermal potential. Using available geological records, we carry out a high-level assessment of the local subsurface environment. This includes mapping geological formations, identifying known offset wells and legacy seismic data, and modelling regional thermal gradients. These inputs allow us to estimate the likely depth, temperature, and physical properties of potential geothermal reservoirs. In parallel, we review the client’s site-specific heat demand. This includes analysing heat usage patterns and seasonal load profiles to understand how a geothermal source could integrate into existing systems. A preliminary matching exercise is then carried out to estimate how much of the site’s heat demand could be met by the proposed system.

An early-stage commercial analysis is also developed. This includes indicative capital and operational cost assumptions, alongside an outline cost of heat under a long-term supply agreement. This helps clients establish whether geothermal energy is likely to be technically and commercially viable before committing further resources.

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Phase 2: Feasibility (Select Stage)

The Feasibility, or Select, phase builds on the scoping results and involves more detailed technical, planning, regulatory and commercial work. If required, we will carry out a new seismic acquisition survey and reprocess historic seismic data to produce a high-resolution 2D or 3D geological model. This model helps confirm the presence and structure of target geothermal horizons, identify fault and fracture systems, and refine expectations around flow rates and temperatures.

We then produce a conceptual well design, considering expected depths, casing requirements, pump specifications and surface footprint. This is paired with an initial design for the surface energy centre and connections to existing infrastructure. Heat delivery methods, system integration, resilience options and performance under varying operating conditions are all considered at this stage. At the same time, we initiate early engagement with the local planning authority and the Environment Agency. We submit pre-application documents to seek feedback and understand what will be required in the full planning and permitting process. This is critical for identifying potential obstacles and building a realistic timeline for future stages.

The commercial element of the feasibility stage involves the development of a full techno-economic model. This includes detailed inputs from the technical assessments and uses simulation tools to test a range of pricing outcomes under different grant funding assumptions and operating scenarios. Where applicable, we work with clients to identify and prepare for grant applications, such as to the Green Heat Network Fund.

Outputs from a Feasibility Study

At the end of the feasibility stage, clients receive a comprehensive package of technical, planning, and commercial outputs that support confident decision-making. Technically, the study will confirm whether a viable geothermal resource is present at the site and what the expected thermal performance would be. It will detail the location, depth and extent of the geothermal horizon and provide a conceptual well design tailored to the site’s geology. The associated surface infrastructure, such as the energy centre, pipework, and connection to the client’s existing heat system, is also outlined with early engineering design considerations included.

From a regulatory and planning perspective, the feasibility study will clarify the likely consenting pathway. It will include findings from pre-application discussions with planning authorities and environmental regulators, highlight any expected requirements such as ecological or heritage surveys, and outline a clear roadmap to secure permissions for drilling, construction and operation. On the commercial side, the study will provide an indicative offer for the supply of geothermal heat under a long-term Thermal Purchase Agreement. This offer will include the expected cost of heat, the structure of the agreement, and any dependencies, such as grant funding or infrastructure upgrades. The economic analysis will include sensitivity modelling to account for uncertainties in drilling depth, flow rate and temperature, giving the client a realistic view of risk and value.

Finally, the study will set out a recommended plan for the next phase of the project, including timescales, resource requirements, and decision points. This enables the client to make an informed board-level decision on whether to proceed to detailed design and permitting.

Why Choose Star Energy?

Star Energy is one of the UK’s most experienced developers of deep geothermal systems.

Our in-house capabilities span geophysics, subsurface engineering, planning and permitting, and commercial modelling. We have worked with NHS Trusts, public sector organisations, and energy-intensive clients to assess and develop long-term geothermal heat projects. Our approach is evidence-led and focused on reducing risk at each stage. We bring knowledge from decades of experience in subsurface development and apply it to help clients navigate the unique technical and regulatory challenges associated with geothermal energy. Whether you’re looking to decarbonise your estate, reduce exposure to fossil fuel prices, or meet long-term carbon targets, our feasibility study service provides the first essential step.

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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

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