Denmark's Green Therma has teamed up with a pipe manufacturer Tenaris to accelerate next-generation geothermal solutions in Europe and reduce the continent's reliance on imported energy.
The collaboration will bring together Tenaris' TenarisHydril premium pipe couplings and connections with Green Therma's closed-loop Heat4Ever solution – a vacuum-insulated pipe system engineered to minimise heat loss and maintain consistent thermal performance.
The partnership reflects a shared commitment to contributing to Europe's energy transition by enabling clean, locally produced heat and reducing reliance on imported energy sources.
"Scaling geothermal requires both strong technology and the right industrial partnerships. With Tenaris, we gain a partner with the capabilities and global reach needed to support the next phase of Heat4Ever development as a competitive and scalable geothermal energy solution," says Jørgen Peter Rasmussen, CEO of Green Therma.
Heat4Ever works by circulating water in a completely closed pipe system installed in hot rock deep underground. This energy is brought back to the surface with the innovative DualVac technology which creates a continuous vacuum over the entire pipe-string that insulates the hot and cold sections of the pipe.
The Hea4Ever technology was demonstrated successfully in 2024 at the Ullrigg test facility at NORCE in Stavanger, Norway, and will be used for the first time in a first full-scale geothermal demonstration plant in Northern Jutland, Denmark. The project involves drilling a geothermal well with a 4km vertical section and a 3km horizontal section to supply geothermal heat to homes in Aalborg.
Tenaris Commercial VP Alessandro D'Angelo says the joining of two advanced technologies for geothermal application aims aims "to reduce reliance on imported energy and strengthen Europe's energy independence and resilience".
Tenaris has a range of insulated pipes and couplings specifically designed for the nascent geothermal energy market. Its TernarisHydril range includes the Wedge Series, an engineered interlocking thread profile for high torque, high compression applications such as multi-fractured horizontal shale wells.
