Geothermal energy refers to the heat stored naturally beneath the Earth’s surface. This heat can be accessed using deep boreholes and used to provide low-carbon heating for buildings, industry, and infrastructure.
Star Energy will look to develop the most suitable system to match the availability and demand. However our core skills are in deep geothermal doublet systems, which involve drilling two deep wells (usually up to 5km) into underground reservoirs to extract heat via hot brine and reinject the cooled fluid after use.
Geothermal heat is particularly suited to district heating networks, hospitals, universities, housing schemes, and industrial parks. It is ideal for providing consistent, high-volume heat in areas with sustained demand.
Our wells typically range from 2,000 to 5,000 metres deep, depending on the geology and temperature gradient of the site.
Temperatures from deep geothermal wells in the UK typically range from 70°C to over 120°C, depending on depth and regional geology.
A full end-to-end geothermal project—from feasibility through to commissioning—typically takes 3 to 4 years, depending on complexity, permitting timelines, and local infrastructure readiness.
We offer a complete turnkey solution including feasibility studies, geological modelling, planning and consents, well design, drilling, surface system design, construction management, installation, commissioning, operations and maintenance, and performance monitoring.
We begin with geological scoping and heat demand analysis, followed by staged feasibility assessments including subsurface modelling, thermodynamic simulation, infrastructure planning, and commercial viability studies.
Yes. Our geothermal systems are designed to integrate with both existing and new district heating infrastructure, and can also operate in hybrid systems alongside other heat sources.
A range of consents are typically required, including environmental permits for abstraction and reinjection, planning permissions, waste management licences, and Groundwater Investigation Consents. Star Energy manages all permitting as part of the delivery programme.
Yes. Geothermal heat is a continuously available natural resource. When systems are designed properly with reinjection and long-term pressure balancing, they are both renewable and sustainable.
Depending on the size of the installation and the carbon intensity of the electricity used for pump, geothermal systems can reduce emissions by up to 90% compared to conventional gas-based heating.
Geothermal systems provide a stable, base-load heat source. Unlike solar or wind, geothermal heat is not weather dependent, making it one of the most reliable sources of renewable heat.
Yes. We manage the full drilling programme, including well design, procurement, rig mobilisation, casing, logging, and testing. Our experience in onshore energy production allows us to deliver technically robust and regulatory-compliant wells.
Yes. We design, build, and operate geothermal plants across their entire lifecycle, providing long-term maintenance, optimisation, and performance monitoring to ensure consistent delivery of heat.
A geothermal doublet is a pair of deep wells. One is used to extract hot water (brine) from an underground reservoir, and the other is used to return the cooled water back underground after the heat has been extracted.
The brine passes through a heat exchanger at the surface, where it transfers heat to a secondary water circuit used in the building or district heating system. The brine itself never mixes with the surface system water.
Geothermal plants require routine inspections of pumps, heat exchangers, control systems, and reinjection performance. We provide full operations and maintenance packages tailored to the site.
There are various government support schemes and grant programmes that may apply to geothermal projects. Star Energy advises clients on potential funding opportunities during the feasibility stage.
The first step is to contact our team for a preliminary assessment. We can carry out early-stage desktop studies to evaluate technical potential and discuss a roadmap to development.