About us
Green Sustainable Solutions d.o.o. is a leading Croatian consulting and project development company dedicated to fostering a sustainable, circular and climate-resilient future in Europe. We excel in developing and coordinating EU-funded projects in the energy sector, focusing on sustainable hydrogen, biomass, biogas and other renewable energy sources. Additionally, we specialize in sustainability in waste management, circular economy, bioeconomy and urban mobility.
With extensive experience in EU programs like Horizon Europe, LIFE, Interreg, and national co-financing schemes, we offer comprehensive support throughout the project lifecycle—from idea generation and proposal writing to technical implementation, stakeholder engagement and impact dissemination.
CEO: Dinko Đurđević
Dinko Đurđević, CEO of Green Sustainable Solutions d.o.o., brings over a decade of leadership in EU project management and sustainable development. With a strong foundation in environmental engineering and international cooperation, he has directed numerous cross-border and interdisciplinary initiatives in renewable energy, regional development and innovation ecosystems. Dinko is known for bridging technical excellence with strategic foresight and local impact, as well as communication and collaboration with relevant scientific and industrial stakeholders.
Strategic Collaboration Partners
Technologiezentrum Energie
An applied research and development centre specializing in renewable energy systems, biogas technologies, hydrogen integration and smart energy infrastructure. (Germany)
Energie Institut at Johannes Kepler University Linz
A pioneering research institution in the field of climate, energy systems and sustainability economics. (Austria)
Energy Institute Hrvoje Požar
A nationally recognized energy research and consultancy institution, providing expert support in energy policy, strategic energy planning, renewable energy integration and implementation of EU energy directives. (Croatia)
Inderloop
A technology-driven company focused on circular economy and waste management solutions, offering cutting-edge innovations in material recovery, digital traceability and smart sorting systems. (Croatia)
Hydrogen Europe
Europe’s leading hydrogen association promoting research, policy alignment and cross-sectoral collaboration for building a competitive and sustainable hydrogen economy. (Belgium)
These collaborations enhance our capacity to deliver science-based,
applied solutions in line with the European Green Deal and Fit for 55 objectives.
What others think about us
Zvonimir Perko
“From consortium building to final submission, GSS ensured coherence across partners, disciplines, and work packages, significantly reducing proposal preparation risks.”
Jorgo Chatzimarkakis
“GSS operates like an embedded extension of the team—fast onboarding, sharp stakeholder coordination and crisp documentation that holds up under audit and reporting requirements.”
Mersiha Babić
“A high-impact partner for sustainability and energy projects: strong technical depth, pragmatic project management and consistently investor- and evaluator-ready outputs.”
Petros Samaras
“A dependable lead on work packages and deliverables—proactive risk management, strong communication and measurable progress without constant follow-up.”
Ivana Dubravec
“Their networking capacity is a major asset—GSS effectively connected relevant stakeholders, research bodies and industry partners to form balanced, delivery-ready consortiums.”
Inmaculada Ranera
“Green Sustainable Solutions d.o.o. brought structure and pace to our EU funding workstream - clear timelines, zero ambiguity and reliable delivery across proposal and implementation phases.”
Jozsef Szuper
“Their ability to translate complex topics (hydrogen, renewables, circular economy) into fundable, bankable project logic is a real differentiator. Outcome-focused and execution-driven.”
Gordana Lalić
“GSS combines proposal-writing excellence with real technical depth. Their inputs on energy, hydrogen and sustainability translated directly into credible, high-scoring applications.”