Bidding zone
A bidding zone (pakkumispiirkond) is the largest geographic area within which market participants can exchange energy without the cross-border-capacity constraint becoming a price boundary. Estonia is the EE bidding zone — a single nationwide day-ahead clearing price. Cross-border allocation with FI, LV and SE4 is implicit, handled by the SDAC algorithm clearing all coupled zones simultaneously.
A bidding zone (pakkumispiirkond) is the largest geographic area within which market participants can exchange energy without the cross-border-capacity constraint becoming a price boundary. Inside a single zone the day-ahead clearing price is uniform; between zones, prices diverge whenever the interconnector cannot transport enough power from the cheaper to the more expensive side. The construct is defined in CACM Regulation (EU) 2015/1222 Article 2.
Estonia is one zone
Estonia is the EE bidding zone — a single nationwide day-ahead clearing price for every hour. The neighbouring zones are FI, LV, SE4 (south-Sweden) and a synchronous link to the Continental European set since 9 February 2025. Cross-border allocation is implicit: the SDAC algorithm clears all coupled zones simultaneously and capacity flows from the cheap zone to the expensive one until either prices converge or the interconnector hits its limit.
When EE prices diverge from FI
The Estonia–Finland interconnection (Estlink 1 + Estlink 2 = 1 000 MW HVDC, when both operational) is the most economically active bidding-zone boundary for Estonia. When EE wind production peaks while FI demand is moderate, Estonia exports and prices converge. When Estlink 2 is out for maintenance or damaged (e.g., the December 2024 Eagle S incident, repaired by June 2025) the spread widens, sometimes to several hundred euros per MWh. This is the spread that makes BESS arbitrage profitable in Estonia.
Dažniausiai užduodami klausimai
- What is a bidding zone?
- A bidding zone is the largest geographic area within which market participants can exchange energy without the cross-border-capacity constraint becoming a price boundary. Inside a bidding zone, the day-ahead price is single — every generator and consumer faces the same hourly (now 15-minute) clearing price. Cross-zone differences are managed implicitly by the EU market-coupling algorithm.
- What bidding zone is Estonia in?
- Estonia is its own bidding zone, designated EE. There's a single nationwide day-ahead clearing price; geography matters only via cross-border interconnections (EstLink to FI, synchronous lines to LV). Latvia (LV) and Lithuania (LT) are each their own bidding zones; Sweden has four (SE1–SE4), with SE4 connected to Lithuania via NordBalt.
- How are bidding zones decided?
- Article 14 of CACM Regulation (EU) 2015/1222 sets out the methodology. Member States designate zones; the structure is reviewed periodically by ENTSO-E. Smaller zones reflect more accurately where congestion occurs internally but are operationally complex. Larger zones simplify the market but can hide congestion. EU-level reviews periodically propose splitting countries (the "bidding-zone review") — Germany was a candidate in the 2018–2024 round.
- What's the difference between a bidding zone and an LFC area?
- A bidding zone is a market construct — where one day-ahead price clears. An LFC area is a physical / control construct — where one TSO controls frequency. The two often coincide (Estonia: one bidding zone = one LFC area = one TSO control area), but they don't have to. Some countries have multiple bidding zones with one LFC area; some have multiple LFC areas combined into one bidding zone.
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