Source - Svk Driftstörningar 8 Juni 2026

Source: Svenska kraftnät news release, “Svenska kraftnät hanterade större driftstörningar”, published 2026-06-10. URL: https://www.svk.se/press-och-nyheter/nyheter/allmanna-nyheter/2026/svenska-kraftnat-hanterade-storre-driftstorningar/ Clipping: Raw/Clippings/Svenska kraftnät hanterade större driftstörningar.md Spokesperson: Pontus de Maré, driftchef (head of operations), Svenska kraftnät.

A short operational account of a two-fault grid disturbance on Monday 8 June 2026 in which the Nordic balancing reserves in SE3/SE4 were activated to exhaustion — a rare, quantified real-world scarcity event. Valuable as empirical evidence for the missing-reserve thesis and as a concrete mFRR illustration.

What happened

Two independent, simultaneous faults in the afternoon of 8 June 2026:

1. SE2↔SE3 transfer reduced — a transmission line was disconnected for personal-safety reasons (people were climbing a transmission tower; Svk’s standard procedure is to de-energise on credible reports).
2. −500 MW import lost on the Swe-Pol Link (SE4↔Poland) in parallel.

Combined effect: system frequency fell to a low of 49.80 Hz (below the 49.9–50.1 Hz normal band — FCR-D activation territory).

The response

To restore frequency and manage stamnät overloads, Svk:

• Activated ancillary services (mFRR) so heavily that every bid in SE3 and SE4 was exhausted — and then had to start four gas turbines on top.
• mFRR activation, quarter 15:30–15:45: 701 MW in SE3 + 255 MW in SE4; smaller activations followed in the next three quarters.
• Exported more to Finland to shed the overloads created by disconnecting the line; received 200 MW each from Lithuania and Norway.

Price aftermath — the imbalance-protection principle

The large mFRR activations produced high mFRR and imbalance (obalans) prices in SE3 and SE4. Svk stated the prices are being investigated per standard routine and are likely to be adjusted down, on an explicit principle:

“Större nätincidenter som denna inte ska drabba de balansansvariga ekonomiskt.” — larger grid incidents like this should not economically harm the BRPs.

This is a concrete instance of ex-post imbalance-price correction, the settlement-layer mechanic administered through eSett (see BSP and BRP Roles).

Key claims

• 8 June 2026: two independent simultaneous faults (SE2↔SE3 line trip from tower-climbers; −500 MW Swe-Pol Link loss); frequency dipped to 49.80 Hz.
• mFRR reserves in SE3 and SE4 were activated to exhaustion (“alla bud tog slut”) → four gas turbines started as the fallback; 200 MW each from Lithuania and Norway.
• mFRR activation 15:30–15:45: 701 MW SE3, 255 MW SE4.
• High mFRR/imbalance prices in SE3/SE4 to be adjusted down; Svk principle that BRPs should not bear the cost of major grid incidents.

Relevance to existing wiki topics