Dutch SME developing Reverse Electro-Dialysis membrane technology for clean energy generation and low-energy water treatment.
REDstack is a Dutch technology SME specializing in membrane-based electrodialysis systems, particularly Reverse Electro-Dialysis (RED) for converting salinity gradients into electricity and conventional electrodialysis for low-energy water desalination. They develop and commercialize membrane stack technology that sits at the intersection of clean energy generation and advanced water treatment. Their work spans from harvesting low-grade heat as electricity to enabling zero liquid discharge in industrial water processes, making them a practical technology provider for projects requiring membrane expertise.
Core technology across all three projects — RED-Heat-to-Power focused on RED for energy, REvivED water combined RED with ED, and intelWATT applies RED for simultaneous energy production in water treatment.
REvivED water specifically targeted revival of electrodialysis for low-energy drinking water production; intelWATT continues membrane technology work for water treatment.
RED-Heat-to-Power focused on converting low-grade waste heat to electrical power through closed-loop RED systems.
intelWATT (2020-2024) explicitly targets zero liquid discharge and circular economy in water treatment, marking a newer direction.
REDstack's trajectory shows a clear shift from energy-focused applications toward integrated water-energy solutions. Their earliest project (RED-Heat-to-Power, 2015) was purely about energy — converting waste heat to power via RED membranes. By 2016-2020, REvivED water pivoted the same membrane expertise toward drinking water desalination. Their most recent project (intelWATT, 2020-2024) merges both streams: water treatment combined with simultaneous energy production, framed within circular economy and zero liquid discharge goals.
REDstack is moving from standalone RED energy technology toward integrated water treatment solutions where energy recovery is a built-in feature — positioning them for industrial circular economy applications.
REDstack consistently participates as a specialist partner rather than leading consortia, contributing their membrane technology expertise to larger teams. Across three projects they have worked with 36 unique partners in 11 countries, indicating they are a sought-after technology contributor rather than a project driver. Their consistent participant role and broad partner network suggest they are easy to integrate into consortia and bring focused, well-defined technical contributions.
REDstack has built a broad European network of 36 unique consortium partners across 11 countries through just three projects, suggesting they work within large, multi-partner consortia. Their base in the Netherlands gives them strong connections across Western and Southern Europe.
REDstack occupies a rare niche as one of very few companies commercially developing Reverse Electro-Dialysis technology — a membrane process that generates electricity from salinity differences. This dual water-energy capability makes them uniquely valuable for projects that need to address both water treatment and energy efficiency in a single solution. For consortium builders, they bring a specific, hard-to-replace membrane technology competence that bridges the energy and water sectors.
