ANCILLARY SERVICES MARKET

The Ancillary Services Market is the venue where Terna S.p.A. procures the resources that it requires for managing, operating, monitoring and controlling the power system (relief of intra-zonal congestions, creation of energy reserve, real-time balancing). In the Ancillary Services Market, Terna acts as a central counterparty and accepted offers/bids are valued at the offered price (pay-as-bid).
The Ancillary Services Market consists of a scheduling stage (ex-ante Ancillary Services Market) and of the Balancing Market (BM). The BM takes place in multiple sessions, as provided in the dispatching rules.
The ex-ante Ancillary Services Market takes place in a single session on the day before the day of delivery. The sitting for offer/bid submissions into the ex-ante ASM opens at 3:30 p.m. on the day before the day of delivery and closes at 5:00 p.m. on the day before the day of delivery. The results of the ex-ante ASM are made known by 9:00 p.m. on the day before the day of delivery. In the ex-ante Ancillary Services Market, Terna accepts energy demand bids and supply offers in order to procure reserve, relieve congestions and balance energy injections and withdrawals into/from the grid.
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