The price of carbon allowances and volume traded at this price on the auctions of the primary market of the EU Emissions Trading Scheme (EU ETS).
A defined volume of emission allowances is allocated per year to each Member State. The states award a part of the allowances to certain companies for free and organise auctions (occurring every couple of days) for the remainder, with earnings from the sales of the allowances fuelling the state funds.
Among others, the companies dealing with energy generation or industrial production are obliged to present an appropriate volume of the allowances by the end of each year.