The European Union auctioned 3.5 million spot carbon permits at the biggest discount to spot market prices in more than three weeks.
The sale, held by the European Energy Exchange AG, cleared at 4.19 euros ($5.61) a metric ton, according to bourse data.
The sale’s closing price was 10 euro cents below the mid-point of prevailing bids and offers for day-ahead futures on the ICE Futures Europe exchange at 10 a.m. London time, according to data compiled by Bloomberg. Prices for December futures dropped as much as 5.5 percent to 4.30 euros a ton immediately after the auction ended.
The exchange had bids totaling 8.1 million tons, giving a so-called bid ratio of 2.3, the lowest for any carbon auction since Feb. 1 when Germany offered 5 million allowances, according to EEX data.
The EU sells permits every Monday, Tuesday and Thursday. Germany offers allowances every Friday and the U.K. sells permits every second Wednesday.