STEM Summary - History
The Short Term Energy Market (STEM) is an energy-only forward market operated by the IMO on the Scheduling Day to facilitate trading around bilateral contract positions. The STEM is run for every Trading Interval of the Trading Day, and determines a single clearing price for each Trading Interval as well as the quantities that sellers will sell to the IMO and that buyers will purchase from the IMO. The auction is designed so that the IMO purchases the same amount of energy it sells, and so has no net exposure.
The IMO must make the following values available from the Market Web-Site for each Trading Interval in each completed Trading Day in the previous 12 calendar months:
- The total STEM Offer quantity. A STEM Offer is an offer to provide energy through the STEM Auction for a Trading Interval determined by the IMO in accordance with clause 6.9.3. The total STEM Offer quantity is the total quantity offered by all Participants.
- The total STEM Bid quantity. A STEM Bid is a bid to purchase energy from the IMO via the STEM Auction for a Trading Interval. The total STEM Bid quantity is the total quantity bid by all Participants.
- Whether the STEM was suspended in relation to the relevant Trading Interval.
- Where the STEM was not suspended, the STEM quantity purchased by the IMO. This is the STEM Clearing Quantity which has the meaning given in clause 6.9.8.
- Where the STEM was not suspended, the STEM Clearing Price. The STEM Clearing Price has the meaning given in clause 6.9.7.