Energimyndigheten Sveriges Energiläge Weekly Series (2026)

The September 2026 editions of Energimyndigheten’s weekly national situation report (Sveriges energiläge, 4 pages each, published on Wednesdays): 2 September (week 36), 9 September (37), 16 September (38), 23 September (39) and 30 September (40), fetched from the agency’s listing page, which links all weekly PDFs back to 20 May 2026. The 7 October edition is on Source - Energimyndigheten Sveriges Energiläge v. 41 (2026-10-07). The figures feed Winter 2026-27 Supply Situation. All five were read in full; the footnoted sources (Nord Pool UMM notices, Energiföretagen, NVE, AGSI, Reuters) were not re-checked.

What changed week by week

• 2 Sep: electricity supply “stable”; no price-risk statement. Reservoirs (week 34) Sweden 73.2 % (mean 80.7), Norway 64.0 % (median 79.5); Nordic hydrological balance −20.9 TWh. Outages: Ringhals 3 to 31 Oct, Ringhals 4 to 15 Oct, Forsmark 1 from 6 Sep to 17 Nov, Olkiluoto 3 from 10 Sep to 29 Oct. Baltic Cable disconnected since 21 June, restart expected 19 September. Gas: European price 70 EUR/MWh on 31 August, the highest since March; storage Sweden 50.35 %, EU 65.39 % (2 Sep), against about 77 % a year earlier.
• 9 Sep: electricity “stable”. Reservoirs (week 35) 73.2 % (80.6) and 63.4 % (80.1); balance −20.9 TWh. Ringhals 4’s outage moved out to 30 November. Baltic Cable out until 18 September. The gas figures repeat the 2 September values.
• 16 Sep: electricity “stable”. A price peak of about 9 kr/kWh in SE4 on Monday evening (14 Sep) is explained by low hydropower levels, limited nuclear availability, a wind lull and transmission limits into SE4. Reservoirs (week 36) 73.8 % (80.8) and 63.6 % (81.0); balance −21.3 TWh. Forsmark 2 at half power 15 to 18 Sep; Fenno-Skan 2 limited to 21 Sep; Baltic Cable back in operation. Gas: Sweden 67.48 %, EU 68.49 % (16 Sep; about 80 % a year earlier).
• 23 Sep: electricity “stable”. Reservoirs (week 37) 74.2 % (80.5) and 64.3 % (82.5); balance about −15 TWh at the end of week 38. SwePol limited to 27 Sep; the SE4 to DK2 cable replacement runs to 8 November (24 October in the next edition). Gas: Sweden 74.02 %, EU 70.14 % (23 Sep; about 82 % a year earlier).
• 30 Sep: the first edition with an explicit electricity price-risk assessment: elevated risk of higher prices for winter 2026/27 but no power shortage, naming weak hydrology, extended nuclear outages and indirectly higher gas prices. Reservoirs (week 38) 75.0 % (80.7) and 66.6 % (83.0); balance −14.4 TWh at the end of week 39. Oskarshamn 3 tests new equipment 6 to 9 Oct; Konti-Skan 1 and 2 limit DK1 to SE3 transfer 5 to 16 Oct; SE4 to DK2 cable replacement to 24 Oct. Gas: Sweden 74.03 %, EU 71.33 % (29 Sep; about 13 points below last year).

Common to all five: fuels, gas, heat and electricity supply assessed stable; early warning for jet fuel; government decision allowing Energimyndigheten to draw down emergency stocks if needed; cooling-water problems for nuclear plants in parts of Europe (Bulgaria in early warning, Romania declared an electricity crisis, Hungary left its warning).

Relevance

The time series behind Winter 2026-27 Supply Situation. The key reading is that the price-risk wording first appears on 30 September, after the 14 September SE4 spike, and that the Nordic hydrological deficit narrowed from about −21 TWh in early September to about −15 TWh while Norway’s reservoirs stayed far below normal.

Limits of this summary

Figures are as printed in each edition; the gas figures in the 9 September edition repeat the previous week’s. Week numbers in the table are the weeks of the underlying data, which lag the edition date.