Auction types

An ascending, multi-round auction in which an opening price and the price step between the auction rounds are set. Participants in such an auction enter, in each auction round, the required quantity in MWh or the required number of SBU (units expressing an aggregate package of storage capacity and withdrawal/injection capacities). If the required quantity exceeds supply, there is another auction round in which the price is raised by the price step. The auction ends when the required quantity is the same as, or less than, that offered.

A time-limited auction with ascending or descending price. Participants enter their bids, while it is not possible to enter a bid that is the same as one already entered by a different participant. After the time limit expires, the auction ends and the participant with the last entered bid obtains all the offered storage capacity and allocated capacities. The auction announcer may set a protection zone (e.g. the last two minutes) for the end of the time limit, in which the auction will be extended (e.g. by another two minutes) if a new bid is made.

An extended ERMMA auction in which participants also enter, in addition to bids, required quantities or numbers of SBU. During such an auction, the participants see the quantity/number of SBU they will get at the offered price.