EUA carbon settled €80.73/tonne on 25 June, its first clean break above €80 1. An EUA is one permit to emit a tonne of CO2 under the EU Emissions Trading System, and every gas plant must buy them: a combined-cycle turbine pays for gas plus roughly 0.2 tonnes of carbon for each MWh it generates. The same day, the Dutch gas benchmark TTF sagged to €40.75/MWh 2, so the two legs of generation cost pulled apart, carbon up and gas down.
Carbon now sets a hard floor under gas-fired power. At €80.73 the carbon leg alone lifts a German plant's marginal cost to roughly €98/MWh even with gas this soft. That €98 floor is the carbon component of the spark spread the heatwave blew out in the lead: when German day-ahead ran to its peak it was the gap above €98 that made the margin, and it is the same floor plants will defend once the weather premium drains.
EUA had already clawed back to €78.22 on 4 June , reversing the sell-off that followed the Commission's May ETS-benchmark revision, and the 25 June break extended that recovery on supply grounds. The annual cap falls about 180 Mt this year and CBAM keeps withdrawing free allocation, so the bid is structural rather than gas-driven. Optimism on US-Iran de-escalation and the UK-EU summit added risk appetite on top.
