Baltic CCR (Capacity Calculation Region)

A Capacity Calculation Region (CCR) is a set of bidding-zone borders on which TSOs perform coordinated cross-zonal capacity calculation. CCRs are established under Article 15 of CACM Regulation (EU) 2015/1222 by ACER decision; the original list of ten CCRs was adopted by ACER Decision 06/2016. The Baltic CCR groups the borders of the three Baltic bidding zones.

Borders covered

The Baltic CCR covers EE–LV (Elering / AST), LV–LT (AST / Litgrid), EE–FI on EstLink (Elering / Fingrid), LT–SE4 on NordBalt (Litgrid / Svenska kraftnät) and LT–PL on LitPol Link (Litgrid / PSE). Some borders also matter to neighbouring CCRs for cross-CCR coordination — EE–FI to Hansa, LT–SE4 to Nordic, LT–PL to Core.

Methodology

Capacity calculation in the Baltic CCR uses coordinated NTC for both day-ahead and intraday timeframes, with the Transmission Reliability Margin capped at 30% of TTC. The latest Baltic DA/ID Capacity Calculation Methodology was approved on 21 November 2024. The TSOs argued that flow-based — used in Core and Nordic CCRs — adds no value in a radially connected system without parallel paths.

Coordination

Operational coordination is handled by the Baltic Regional Coordination Centre (Baltic RCC), a Tallinn-based joint venture of Elering, AST and Litgrid established under the Clean Energy Package and operational since 2022. Baltic RCC performs day-ahead capacity calculation, security analyses and outage coordination on behalf of the three TSOs.

Sources

CACM Article 15 · ENTSO-E: Capacity Calculation Regions · Baltic DA/ID CCM (21 Nov 2024)