Closer look

Better understanding

The flow-based coupling method

Flow-based coupling within the CWE region went live on 21 May 2015.

Prior to that, these four bidding zones were coupled on a Net Transfer Capacities (NTC) basis, meaning that limitations on exchanges were set bilaterally for each border (one constraint per border and per direction, implicitly taking into account the state of the network).
Constraints now explicitly take into account the physical network infrastructure in the five countries. Cross-border exchanges are thus optimised to reflect the actual physical capacities of networks as accurately as possible. This requires very close coordination between transmission system operators in CWE countries.
In sum, it is no longer possible to consider borders separately, and indicators previously used for the France-Belgium and France-Germany borders have been replaced by France-CWE region indicators.

France was once again a net exporter to CWE


France was once again a net exporter to CWE, with a balance of 2.7 TWh. The balance was nonetheless lower than in 2018, chiefly owing to increased availability of nuclear power plants in Belgium, leading that country to import less electricity from France. Belgium ended the year with a net export balance (taking all borders together).

Closer look

Better understanding

Rise in price convergence within the CWE region


Cases of price convergence within the CWE rose sharply to 42% from 33% in 2018. This was the highest level on record since markets were first coupled. The rise was driven by much more homogeneous market conditions in the different CWE countries and by the additional interconnection capacity available.

Closer look

Better understanding