ENERVIA benefits & solutions
Comprehensive expertise for reliable PTES systems
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.
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.
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Case studies
Decarbonizing district heating with pit thermal energy storage in Meldorf
Germany’s first large commercial pit thermal storage in Meldorf shows how district heating can be decarbonized. GSE® HDH, GSE HD liners and FABRINET® protection layers enable safe high-temperature storage, reducing CO₂ emissions by 90 percent and store 1,500 MWh annually.
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Case studies
Seasonal pit thermal energy storage drives fossil-free heating in Bracht
In Bracht, Germany, a pit thermal storage system integrated with solar collectors (71 percent from sun), heat pumps (6 percent green electricity), and biomass (23 percent) supplies a renewable heat solution according to the simulation of the University Kassel. Solmax geomembranes ensure long-term containment, enabling near-zero emissions and stable heating for 180 households.
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Case studies
Seasonal solar storage brings fossil-free heating to Tibet
On the Tibetan Plateau at 4,600 m ASL, Solmax geosynthetics enabled Tibet’s first large solar thermal district heating system. A 15,000 m³ pit thermal energy storage stores 700 MWh of heat, meeting 90 percent of Langkazi’s demand.
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