On 30th January 2025 in the article ‘Interconnector intricacies: double and triple auto-clamping of pesky negative residues’ an illustration was provided of counter-price flow.
i.e. Normally, one would expect inter-regional interconnectors to flow power from cheap regions to more expensive regions (this happens most of the time).
However on occasion the form of constraint equations operating (or ‘invoked’) at the time means that power flows in the inverse direction. That’s what is meant by counter-priced flows.
There are a series of articles tagged with ‘counter-price flow’.