ENERVIA benefits
& solutions
Comprehensive expertise for reliable PTES systems
Pit Thermal Energy Storage (PTES) is a large, insulated, water-filled heat storage system built below ground, capturing surplus heat from renewable sources such as solar thermal plants or industrial processes and storing it for when required, both in the short or long-term.
ENERVIA™ unites Solmax’s experience in material science, engineering, and installation into one complete solution for heat storage. Every PTES system is unique — but the goal is always the same: safe, durable, and efficient operation for decades. By combining proven geosynthetic technologies with specialized installation expertise, Solmax delivers storage systems that meet the highest performance standards and make it possible to build a 100% fossil free solution.
Key benefits of ENERVIA PTES solutions
1
Long-term reliability through high quality geosynthetic materials that resist heat, pressure, and long-term contact with the sub-grade.
2
Operational efficiency by minimizing heat loss and ensuring stable performance over time
3
Cost effectiveness through fast and optimized installation methods and long service life
4
Environmental sustainability by reducing fossil fuel use and enabling large scale heating from renewable and surplus heat sources.
5
Integrated delivery from design support to on-site construction, ensuring consistent quality and accountability
High-performance material solutions by Solmax
Solmax products form the core of every ENERVIA system. They were developed to withstand the demanding conditions inside a PTES — high temperatures, hydrostatic pressure and long-term exposure to water, soil and weather conditions.
GSE HDH
A high-temperature resistant geomembrane that provides watertight sealing of the storage and maintains its integrity up to 90 °C.
FABRINET BP-H Base Protect
A robust protective and drainage layer that safeguards the subgrade and ensures the long-term stability of the geomembrane at high operating temperatures.
FABRINET BP-H
A complementary product used as a protective, drainage, venting and ventilation layer to ensure the functionality and stability of the floating storage lid.
Both as a high-temperature-resistant variant on the floating high-temperature-resistant geomembrane, which is directly exposed to the high temperatures in the upper storage area, and as a standard variant in the upper layers of the floating lid, which are exposed to lower temperatures due to the thermal insulation beneath them.
Prefabrication
Using geosynthetics, Solmax can prefabricate many components of the system including inlets and outlets, access shafts, inspection shafts, de-gassing and ventilation openings according to required specifications.
Technical advice
Solmax provides advice on thermal insulation materials and improve the overall efficiency of storage.
From design to implementation
The Solmax technical team provides support throughout every phase of a PTES project - initial pre-feasibilty study and technical calculations to material selection and installation. Our specialized teams are trained specifically in the handling of Solmax materials and PTES construction methods, ensuring safe and precise installation on site.
With decades of experience in lining systems and a global presence, Solmax ensures that every ENERVIA project is built to last - enabling our partners to deliver clean, reliable heat for generations.
