In Eastern Europe, Energy Attribute Certificate (EAC) infrastructure and market participation are gaining momentum, opening new opportunities for both renewable producers and corporate buyers. Regulatory frameworks are increasingly aligned with EU standards, and national Guarantees of Origin (GO) registries are becoming more robust and interconnected. A recent example is the introduction of a fully electronic GO registry in Moldova, replacing a manual system and enabling transparent issuance and cross-border transfers. Such developments strengthen market integrity, increase liquidity, and improve access to broader European renewable certificate markets, supporting both decarbonisation objectives and regional investment. 

Several Central and Eastern European countries (Austria, Croatia, Czech Republic, Hungary, Poland, Slovakia, and Slovenia) operate established GO systems that are particularly relevant to organisations active in the region. In the Czech Republic, Guarantees of Origin are issued through the Registry of Guarantees of Origin (EZP), managed by the national market operator OTE, a.s. The system is fully electronic and tracks GOs throughout their lifecycle, from issuance to cancellation, allowing certificates to be transferred domestically and internationally in line with European standards.  

Market statistics further demonstrate the growth and dynamism of the Czech GO market. In 2024, over 6.5 million GOs were issued, marking a 32% increase over the previous year, with cross-border transfers expanding significantly: incoming transfers up 44% and outgoing transfers up 98%. In 2025, the Czech GO market continued to grow in absolute terms, with total issuance increasing further; however, this growth was primarily driven by the issuance of nuclear guarantees of origin, rather than renewable electricity GOs. OTE highlights that “guarantees of origin serve to prove the origin of the energy produced and delivered to the end customer and allow, among other things, to assess and prove the degree of impact of companies or citizens on the environment.” 

The Czech GO system is also expanding beyond electricity. OTE recently joined the AIB’s Gas Scheme Group, enabling the international transfer of biomethane guarantees of origin.  According to OTE, “a guarantee of origin can be issued for electricity, biomethane, heat or hydrogen,” and the system is harmonised with other countries through the Association of Issuing Bodies (AIB), enabling cross-border transfers of renewable attributes. 

For organisations in Eastern Europe, understanding how national GO systems like the Czech Republic’s operate and interconnect with pan-European markets is crucial. These systems support credible renewable energy claims, enable corporate decarbonisation strategies, and create access to active and transparent attribute markets. Engaging with EAC frameworks can provide a strategic advantage for energy producers and corporates alike.  

RECS works to ensure that GO systems and markets are as efficient and effective as possible. For example, RECS is supporting our Czech members in their calls for allowing all market participants to cancel GOs in the national registry and for issuance and transfer fees in line with other European registries. By participating in the RECS Market Meeting 2026 (Prague, 2–3 June), you can hear more about RECS’ work and learn in detail how GO systems and markets function in practice. Attendees will gain insight into market mechanics, connect with regional and international peers, and develop the knowledge needed to navigate the evolving renewable energy attribute landscape effectively.