Flow-based Capacity Calculation

Coordinated Capacity Calculation across Day-ahead, Intraday, Long-Term and Balancing timeframes.

This webpage provides information on the Nordic Flow‑based Capacity Calculation used in the Nordic electricity markets. Flow‑based Capacity Calculation determines the available cross‑zonal transmission capacity by taking into account the physical characteristics of the power system and the interdependencies between bidding zones. The webpage covers both the Flow‑based Methodology itself and its implementation across different timeframes including Day-ahead, Intraday, Long-Term and in the future also Balancing timeframe.

The Nordic TSOs aim to ensure transparency in capacity calculation across all timeframes. This webpage serves as a central information source for market participants and stakeholders, supporting a consistent understanding of how Flow‑based Capacity Calculation is applied in the Nordic power system.

Nordic Flow-based Programme

In the Nordics, TSOs (Energinet, Fingrid, Statnett and Svenska Kraftnät) have together with the Nordic Regional Coordination Center (RCC) introduced a coordinated initiative called Nordic Flow-based Programme for further develop Flow‑based Capacity Calculation in the Nordic electricity markets. The programme brings together methodology development, technical implementation, and operational readiness under a common governance structure. Programme coordinates also stakeholder communication and updates of these webpages.

Main goals of the programme:

Ensure secure and efficient capacity calculation
Support efficient market functioning
Implement flow‑based methodology across relevant market timeframes
Ensure harmonised Nordic implementation
Promote transparency for market participants
Enable continuous development and compliance

Contact details

All questions and queries can be sent to mail address flow-based@nordic-rcc.net (old ccm@nordic-rcc.net still works)

News

19 May 2026: Statnett to implement UPDATED FRM values & iMPROVED METHOD FOR fMAX in the Da cAPACITY CALCULATION

Statnett plans to implement updated Flow Reliability Margin (FRM) values and an improved method for calculating transmission limits (Fmax) in the Day-ahead capacity calculation from Energy Delivery Day 19/06/2026.

Read the news here

UPCOMING stakeholder event

Online stakeholder event, September 3, 2026, 09:00 – 10:45 CET

The Nordic TSOs invite stakeholders to join an online stakeholder event.

The event covers topics on:

Long-term Capacity Calculation and NUCS
Status of Flow-based IDA (Intraday Auctions)
TSO reflections on specific case studies