Croatia is preparing auctions for more than 311,000 renewable guarantees of origin, with an offer of at least 311,468 certificates scheduled for 28 July 2026. The sales will add new wind, solar, biomass and biogas certificates to the regional market for documented renewable electricity. Each guarantee normally corresponds to 1 MWh of electricity generated from a specified source.
As a result, the announced volumes correspond to more than 311 GWh of renewable production. The auctions are being organised by HROTE, ENNA Next and CROPEX. The certificate volumes cover multiple technologies and production periods.
Certificate volumes and production windows in the 28 July 2026 auctions
HROTE will offer 283,779 guarantees of origin 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. Including German certificates provides buyers a choice between domestic and imported renewable attributes.
The commercial value of those attributes may differ depending on customer requirements. That structure links certificate eligibility to both the technology mix and the stated production months. It also separates Croatian-supported incentive coverage from other included supply.
How guarantees of origin are used by market participants
The auctions take place as guarantees of origin become more important for Croatian suppliers and industrial consumers. Electricity retailers use guarantees 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, according to factors including technology, country of origin, production month, support status and buyer preference. Croatian wind certificates may attract a premium from domestic companies seeking geographically matched claims. 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 processes or negotiating renewable power-purchase agreements.
Auction role in trading structures and certificate pricing dynamics
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 demand better data integration than annual certificate reconciliation traditionally used by suppliers.
The auction is also expected to provide a price signal for the Croatian renewable market. More than 283,000 certificates entering in one event could pressure clearing prices 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, selling certificates creates 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 provides a transparent trading platform and a formal settlement mechanism.
The volume is modest relative to Croatia’s total electricity consumption but is 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 evidence that covers source, location, production period and certificate ownership.
