Becoming part of the European energy market

There are two separate integrations. One is physical: operating at the same frequency, connected by transmission lines. The other is commercial: trading in the same market on the same timetable and rules. The first was completed on an emergency basis; the second is still under way.

What market coupling means

That the day-ahead auctions in connected markets are cleared together by a common algorithm, which allocates cross-border capacity implicitly to whichever trades create the most value.

Without coupling, capacity is auctioned separately and traders guess at the price difference. With coupling, electricity flows from the cheaper market to the dearer one automatically, up to the physical limit.

What it requires

Compatible market design: the same gate closure times, the same product definitions, the same balancing rules.

A power exchange operating on accepted terms, with clearing and collateral arrangements counterparties trust.

A regulator whose decisions are recognised by neighbouring regulators.

Why it is worth completing

Coupled markets use interconnection far more efficiently, which means the same physical lines deliver more value. That is a direct gain to consumers on both sides and it requires no new construction.

The strategic layer

A country whose electricity market is technically and commercially integrated is very difficult to isolate. That is a security property produced by market rules rather than by defences, and it is one of the better arguments for the whole exercise.

The physical connection is the visible work; the long work is becoming able to trade on the same rules. I have watched the same thing at customs: opening the crossing takes a day, getting both sides to read the same declaration the same way takes years. Market integration is precisely that second part, and until it is finished the connection stays half made.