The frequency was free: what the Baltics actually bought when they left BRELL

Nine Minutes Past Nine

At 09:09 on Saturday 8 February 2025, Lithuania opened its last live circuit to Belarus. Latvia followed within minutes; Estonia was last. Nine connections to Russia and Belarus, the physical residue of an agreement among five parties renewed in 2001, went open-circuit on a winter morning and stayed that way. In central Vilnius a purpose-built clock nine metres tall counted down the final seconds, which tells you how the day was being staged: not as a switching procedure but as a departure.

What happened at that instant is less photogenic and a good deal more interesting. Three national grids, something over 13 GW of installed capacity between them, serving about six million people, became an electrical island: every watt consumed anywhere in the Baltics now had to be generated inside the Baltics at that instant, and the fifty cycles per second on which every motor and protection relay depends became a purely local variable with purely local consequences. For the first time in their history, the three Baltic system operators had to hold 50 hertz themselves, with nothing outside to lean on.

Here is the number that makes the morning legible. Under BRELL, the entire contractual reserve obligation of the Baltic transmission system operators was 100 MW of normative emergency reserve capacity. And not each. One hundred megawatts, held mutually across all five BRELL parties. Latvia's AST and Estonia's Elering had procured no balancing capacity at all before synchronisation: not a small amount, not a token amount. None. Only Lithuania's Litgrid ran a real product: 350 MW of upward mFRR, bought each morning in a day-ahead auction. For 2026, the Baltic load-frequency control block's balancing capacity demand is roughly 1,600 MW.