ENDEF ENGINEERING SL

Their core work

ENDEF is a Spanish engineering SME based in Zaragoza that develops hybrid solar energy systems and energy storage solutions for buildings and industry. They specialize in thermal and electrical energy storage technologies, including phase-change materials, thermochemical storage, and redox flow batteries. Their work spans from capturing low-grade residual and renewable heat to integrating storage systems into residential and industrial settings. They also developed ECOMESH, a hybrid solar panel combining heat capture and electricity generation.

What they specialise in

How they've shifted over time

ENDEF started in 2016-2018 focused on low-grade heat recovery and hybrid solar panels for buildings and industry, with keywords like heating, cooling, residual energy, and PVT panels. From 2019 onward, their focus shifted decisively toward energy storage — thermochemical materials, phase-change materials, electrical storage, and redox flow batteries. The trajectory shows a company moving from energy capture and upgrading toward energy storage and grid integration, a natural progression along the energy value chain.

ENDEF is moving from thermal energy capture toward integrated storage solutions (thermal + electrical + batteries), positioning themselves at the intersection of renewable generation and grid-scale storage.

How they like to work

ENDEF primarily joins consortia as a participant (4 out of 5 projects), contributing specialized engineering know-how rather than leading large research efforts. They coordinated one project (ECOMESH), which was a small SME Instrument Phase 1 feasibility study, suggesting they are comfortable leading focused innovation sprints around their own products. With 73 unique partners across 20 countries, they are well-connected for a small company and bring a broad European network to any consortium.

Despite being a small SME, ENDEF has built a remarkably wide network of 73 consortium partners across 20 countries, indicating they are a trusted and sought-after technical partner in energy projects across Europe.

What sets them apart

ENDEF bridges the gap between solar energy generation and storage — few SMEs combine expertise in hybrid solar panels (PVT), thermal storage materials, and flow battery integration. Their engineering background means they focus on real-world installation and system integration, not just lab-scale research. For consortium builders, they offer a rare combination: a hands-on engineering SME that can contribute both thermal and electrical storage expertise with proven product development experience (ECOMESH).

Highlights from their portfolio

• ECOMESH
  Their only coordinated project — an SME Instrument Phase 1 developing their own hybrid solar panel product, revealing their core commercial ambition.
• MiniStor
  Largest funding (EUR 438,550) and longest project (2019-2025), focused on compact residential energy storage combining thermal and electrical technologies.
• CUBER
  Marks their expansion into flow battery technology for renewable grid integration, signaling a strategic move into electrochemical storage.