From 20 to 22 May 2026, Opatija will spend three days in the rhythm of energy. A city of European encounters and a renowned tourism and congress destination, it will host Dani OIE 2026 (RES Days 2026), the largest national conference dedicated to renewable energy.

At a time when Europe is increasingly seeking stable and domestic energy sources, the discussion on energy is no longer just about technology or climate goals. It is becoming closely linked to security of supply, economic competitiveness, and affordable energy prices for households and businesses.

Dani OIE 2025 in Split brought together more than 400 participants from 19 countries, representing 115 companies and 30 institutions. An even broader international response and stronger interest from both the professional and business community are expected in Opatija.

Dani OIE 2026 are conceived as a meeting point for ideas, experience and investment – a place where the conversation on energy is open, practical and focused on what lies ahead for Croatia and Europe in the years to come.