A total of 312,171 guarantees of origin were sold through six auctions on the CROPEX trading platform. One guarantee generally represents 1 MWh of qualifying electricity, so the transactions covered environmental attributes attached to more than 312 GWh of renewable generation.
The largest volume came from Croatian energy-market operator HROTE, which offered 244,413 wind guarantees. The certificates, covering electricity produced during the second quarter of 2026, cleared at €1.42 per GO.
In the same auction set, HROTE sold 39,366 biomass guarantees at €1.33 per GO. Combined, the two HROTE sales accounted for almost 91% of the total volume offered in the disclosed auctions.
Croatian and German wind, plus smaller solar and biogas volumes
ENNA Next sold 22,698 Croatian wind guarantees covering generation from March through May at €1.33 per GO. The company also sold 2,669 guarantees linked to German wind plants at €1.46, the highest clearing price among the categories disclosed.
Smaller transactions included 1,174 solar guarantees clearing at €1.36. The same auction set included 1,012 biomass guarantees at €1.31, and 136 biogas guarantees at €1.12.
Koer sold an additional 703 solar guarantees covering June generation at €1.31. Across the disclosed categories, prices generally ranged between €1.31 and €1.46/MWh.
The clearing outcomes show German wind certificates trading slightly above Croatian wind, while solar cleared close to the main wind and biomass products. At these levels, guarantees of origin function as supplementary revenue rather than a central project-economics input for eligible producers.
A wind project selling certificates at €1.42/MWh would earn about €142,000 for every 100 GWh of eligible annual production. The certificate income can support operating margins but remains small relative to wholesale power revenues and does not offset sustained price cannibalisation or curtailment.
Paks derating after Danube low levels lifts Hungary’s near-term prices
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Paks unit 1 cut by about 254 MW after Danube fell to -106 cm at Paks
MVM reduced output at Hungary’s Paks nuclear power plant after the Danube reached an exceptionally low level, creating a supply constraint in a market already affected by summer cooling demand and reliance on cross-border imports. The operator cut Paks unit 1 by approximately 254 MW, equivalent to about half of the unit’s capacity and roughly 13% of total plant output.
The action followed a reported Danube level of -106 centimetres at Paks, described as the lowest recorded at the site. Paks is Hungary’s only nuclear power station and normally supplies close to half of domestic electricity generation, so even partial derating affects residual demand, import needs and short-term wholesale prices.
Cooling-water temperature limits and drought-linked demand pressure
The reduction was implemented to meet environmental requirements governing the temperature of water returned to the Danube. Nuclear units use river water for cooling, and during periods of low flow combined with higher ambient temperatures, discharged water can raise river temperatures beyond permitted or environmentally sustainable levels.
A similar pattern had already occurred during June and July, but the latest intervention is described as more significant because it coincides with worsening drought and rising regional electricity demand. Hungarian consumption was forecast at approximately 4,569 MW for 29 July, while domestic generation remained insufficient to cover demand.
Nuclear output drop lifts imports; day-ahead HUPX rises
The impact appeared in regional production data as Hungarian nuclear output fell from an average of 1,834 MW to 1,577 MW. The reduction aligns broadly with the derating applied to unit 1.
