Croatia is preparing auctions for more than 311,000 renewable guarantees of origin, with the scheduled sale set for 28 July 2026. The planned offering is at least 311,468 guarantees of origin, covering new wind, solar, biomass and biogas certificates for documented renewable electricity. The volumes correspond to more than 311 GWh of renewable production based on the standard representation of each guarantee.
The auctions will be organised by HROTE, ENNA Next and CROPEX. Each guarantee normally represents 1 MWh of electricity generated from a specified source. This structure links the auctioned certificates to defined generation attributes.
Certificate volumes and technology coverage for 28 July 2026
HROTE will offer 283,779 certificates associated with electricity supported through Croatia’s incentive system. The portfolio covers wind and biomass generation produced during the second quarter of 2026. These volumes account for approximately 91% of the announced supply.
ENNA Next will sell an additional 27,689 certificates covering Croatian wind, solar, biomass and biogas production from March to May. The package also includes certificates from German wind farms produced during April and May. The German inclusion provides buyers a choice between domestic and imported renewable attributes, with commercial value potentially varying by customer requirements.
Role of guarantees of origin in corporate and industrial use
The auctions come as guarantees of origin are becoming more important for Croatian suppliers and industrial consumers. Electricity retailers use them to substantiate renewable products. Exporters increasingly require auditable electricity information for corporate reporting, supply-chain questionnaires and carbon-related commercial agreements.
Not all guarantees carry the same value in trading. Technology, country of origin, production month, support status and buyer preference can lead to substantial price differences. Croatian wind certificates may attract a premium from domestic companies seeking geographically matched claims, while biomass and biogas certificates may appeal to buyers looking for controllable renewable generation rather than intermittent supply.
For industrial companies, certificates function as documentation instruments rather than physical delivery arrangements. A company can purchase guarantees equal to its annual electricity consumption without changing its hourly power supply. This distinction is relevant for businesses developing carbon accounting approaches or negotiating renewable power-purchase agreements.
Auction design, settlement mechanics and market pricing signals
The stronger commercial model combines metered electricity consumption, supply contracts, guarantees of origin and a clear cancellation process. Large exporters may also require hourly or monthly matching to demonstrate a closer relationship between consumption and renewable generation. Such structures require better data integration than the annual certificate reconciliation traditionally used by suppliers.
The auction is also expected to provide a price signal for the Croatian renewable market. With more than 283,000 certificates entering in one event, clearing prices could face pressure where supply exceeds immediate compliance or voluntary demand. Technology-specific auction design may limit direct competition between wind, biomass and other sources.
For generators receiving regulated support, certificate sales create an additional value stream for the incentive system. For ENNA Next, the multi-technology portfolio provides flexibility to serve different buyer preferences. CROPEX’s role supports a transparent trading platform and a formal settlement mechanism.
The overall volume is modest relative to Croatia’s total electricity consumption, but it remains commercially relevant for corporate buyers preparing renewable-procurement strategies for the second half of 2026. The market is moving from generic “green electricity” claims toward more detailed evidence covering source, location, production period and certificate ownership.
