Breakthrough Technologies
for Energy Systems

Water Electrolysis, Heat Pumps and more.

About Voltera Our Technology

Disruptive Deep Tech Innovation for Cleantech

Voltera Bulgaria is a deep-tech startup focused on developing transformative energy system innovations. We specialize in advanced technologies for heat pumps, hydrogen production, and desalination.


  • ✓ High-temperature sealed electrolyzers
  • ✓ Refrigerant-free thermal management systems
  • ✓ Next-generation industrial & automotive integration
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Our Core Technologies

We work on transformative energy system innovations in heat pumps, hydrogen production and desalination.

H₂

VolteraH2

Reducing energy requirements for hydrogen production using low-grade water sources including seawater.

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❄️

ColteraTREC

Innovative heat pump technology eliminating noxious refrigerants and achieving maximum theoretical efficiency. Specifically designed for automotive and data center HVAC & thermal management.

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The Voltera BG Team

Meet our team of scientists, engineers and visionaries with decades of experience in business and technology development, all over the globe.

Dr. Krassen Dimitrov

Founder, Chief Scientific Officer
PhD, Biochemistry

Eleonora Rangelova

Chief Administrative Officer

Dr. Angel Giancarlo Miranda

R&D Engineer
PhD, Mechatronics

Anelia Vasileva

R&D Engineer
PhD candidate, Electrochemistry

Mihail Videnov

R&D Engineer
MSc, Hydraulics

Petar Yotov

R&D Engineer
BSc, Mechatronics

News & Updates

Developments from the forefront of Cleantech innovation

November 3, 2025

ColteraTREC Project Officially Launched with Kick-off Meeting in Sofia

The ColteraTREC consortium partners gathered in Sofia, Bulgaria, to establish the technical vision and collaborative framework for the hybrid energy project.

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November 28, 2025

ColteraTREC Participates in the EIC Clean & Efficient Cooling Annual Portfolio Meeting

The ColteraTREC consortium joined fellow EIC innovators at Delft University of Technology to share insights and build synergies for sustainable cooling.

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December 12, 2025

ColteraTREC Official Announcement: December 2025

Official publication regarding the latest project milestones and strategic developments for the 2026 roadmap.

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ColteraTREC Participates in the EIC Clean & Efficient Cooling Annual Portfolio Meeting

November 28th, 2025 | Delft University of Technology, Netherlands
EIC Clean & Efficient Cooling Meeting

We are pleased to share that ColteraTREC took part in the EIC Clean and Efficient Cooling Annual Portfolio Meeting on 19 November at Delft University of Technology in the Netherlands. Our Founder and Chief Scientific Officer, Dr. Krassen Dimitrov, presented the technology and business and use case in front of other founders and engineers.

The meeting stands as a key gathering of innovative projects funded by the European Innovation Council (EIC). This event brought together leading researchers, innovators, and technology developers working to advance breakthrough solutions for the future of clean and efficient cooling.

The meeting aimed to foster collaboration, share knowledge, and build strong synergies across the EIC community. Guided by the EIC, the event offered a dynamic platform to:

  • Exchange insights on cutting-edge research methodologies and project results
  • Identify opportunities for joint activities, shared resources, and cross-project innovation
  • Discuss strategies for market deployment, communication, and exploitation of project outcomes
  • Strengthen ties across Europe’s growing innovation ecosystem

Our project, ColteraTREC, was proud to present our vision, share progress, and engage in meaningful discussions with fellow EIC projects. The exchange of ideas and best practices was inspiring and reinforced our commitment to pushing forward innovative thermal energy recovery solutions.

We would like to thank EIC – European Innovation Council for the excellent organization and hospitality, and to all participating teams for their valuable contributions and collaborative spirit.

We look forward to building on the connections and opportunities initiated during the meeting.

Stay tuned for more updates from the ColteraTREC project!

EIC Portfolio Meeting Additional Image 1
EIC Portfolio Meeting Additional Image 2

Partnership Opportunities

Collaborative innovation is at the heart of our mission. Connect with us to explore synergies in clean cooling technology.

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ColteraTREC Kick-off Meeting in Sofia

November 3rd, 2025 | Sofia, Bulgaria
ColteraTREC Kick-off Meeting

The ColteraTREC project officially launched with its Kick-off Meeting (KOM) held in Sofia, Bulgaria, on 17–18 October 2025, hosted by Voltera-BG, Ltd. The meeting brought together all consortium partners to establish a shared understanding of the project’s structure, goals, and planned activities.

Over the course of two days, partners engaged in in-depth discussions about the research methodology, system development, modeling approaches, sustainability assessments, and strategies for project dissemination. These conversations were crucial for aligning expectations, clarifying timelines, and identifying the interconnections between the various work packages that will drive the project forward.

The KOM also provided a valuable opportunity to outline the technical vision of ColteraTREC. The project aims to design, simulate, and model a hybrid energy system that combines an energy-harvesting module—capable of generating electricity from waste heat—with a heat pump module for active cooling of ambient air. The meeting served as a catalyst for the initial steps toward achieving these objectives, fostering collaboration and innovation among the partners.

We were pleased to welcome representatives from the European Innovation Council (EIC), who provided guidance on project obligations and highlighted potential synergies within the broader European innovation landscape. Their insights offered valuable perspective on how ColteraTREC can maximize impact and align with ongoing portfolio activities.

A special thank-you goes to Voltera Bulgaria. for their excellent organization and warm hospitality. We are also grateful to all project partners for their active participation and collaborative spirit, including Leibniz Universität Hannover, Technische Universität Clausthal, Dias Media Group, and University of West Attica.

With the project now officially underway, the consortium is ready to take the first steps toward advancing sustainable energy solutions and exploring innovative technologies that harness waste heat while providing efficient cooling. The ColteraTREC project promises to be an exciting journey of collaboration, research, and impact.

Partnership Opportunities

As the ColteraTREC project enters its primary R&D phase, we are open to discussions with industrial stakeholders interested in waste-heat recovery applications.

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VolteraH2

Advanced Water Electrolysis Technology

VolteraH2’s proprietary sealed electrolysis technology delivers numerous advantages over existing state-of-the-art solutions.

We’ve engineered a proprietary sealed electrolysis (SE) cell, an environment where the electrolysis process occurs.

Our sealed cell offers superior energy efficiency, safety and cost-effectiveness, ensuring optimal operational parameters are maintained, especially with intermittent sources of electricity.

VolteraH2 Technology Detail

Key Advantages

Our SE cell technology provides a competitive edge through clever engineering and process optimization.

Energy Efficiency

By improving the electrical efficiency of the process and simplifying the balance-of-plant systems, the Sealed Electrolyzer substantially lowers the overall cost of hydrogen production.

No Water Purification Requirement

In SE electrolyte and electrodes are sealed and separated from the water feedstock and the electrolysis reaction is supplied by water vapor crossing interfaces. This allows SE to work with low quality water feedstock, even seawater, which has been considered a “holy grail” in the field.

Avoids Expensive and Rare Metals

Unlike traditional systems, SE doesn’t rely on Platinum Group Metals (PGMs), or other rare materials. Our sealed design protects metal components from corrosive KOH, permitting construction from affordable stainless steel.

Pressurized Hydrogen Production

Our electrolysis system operates under pressure, generating hydrogen that is already compressed. This reduces the need for hydrogen compression, saving energy and further reducing costs.

Interested in sustainable hydrogen production?

Learn how VolteraH2 can integrate with your renewable energy projects to provide efficient and cost-effective hydrogen feedstock.

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ColteraTREC

Refrigerant-Free Thermal Management

ColteraTREC is a breakthrough cooling technology, which will radically change the way cooling is accomplished.

By eliminating the use of vapor-compression cycles, noxious refrigerants, and achieving energy efficiencies close to the theoretical maximum.

ColteraTREC systems are lightweight, built from low-cost materials, and do not rely on any critical raw materials.

ColteraTREC Overview
ColteraTREC Application

The dual functionality of ColteraTREC can efficiently provide EV cabin comfort in any weather conditions, holds immense significance for the electric vehicle industry. Its ability to significantly reduce electricity consumption for AC ensures that more energy is dedicated to propulsion, extending the vehicle's range and further promoting its eco-friendliness.

А 3-stack configuration of ColteraTREC technology can be applied to data centers temperature management systems, where waste heat from the servers can be harvested for direct electricity generation, and heat-pump stacks can be used to condition the center temperature to its optimum.

Ready to optimize your thermal systems?

Discover how ColteraTREC can be customized for your specific electric vehicle or data center requirements. Our team is ready to help you implement the next generation of cooling technology.

Contact Our Engineers