Strategisk Reserv

Sweden’s national capacity mechanism, established by Lag 2025:50 (om finansiering av en kapacitetsmekanism för elmarknaden) and operationalized by Förordning 2025:835. It replaced the old effektreserv (ended March 2025) and provides a ring-fenced backstop volume of dispatchable capacity held outside the market and activated only during extreme scarcity.

Legal basis and design

Lag 2025:50 is the primary legislation; Förordning 2025:835 entered into force October 1, 2025. Svenska kraftnät procures reserve capacity for winter peak periods through competitive auctions.

Key design parameters (Source - Forordning 2025-835 Kapacitetsmekanism (2025) unless noted):

• Technology-neutral: production units, energy storage, and demand-flexibility capability are all eligible resource types (§2) — but a demand-flexibility resource may only qualify if it can be assumed the resource would otherwise not be used (§7), a genuine anti-cannibalization bar, not just a formality
• Statutory endurance/activation requirements: activation time ≤ 14 hours; must sustain called-off capacity continuously for ≥ 2 hours (§6). The statute itself sets no minimum-MW bid size — Svk may set one at its own discretion (§9); the ≥1 MW figure cited in Svk’s own procurement materials is a procurement choice, not a statutory floor
• Contract types: either the coming winter period (16 Nov–15 Mar), or 2–5 year multi-year contracts with delivery starting 12–24 months after procurement closes (§12); multi-year generation contracts must be 100% fossil-free (§16); multi-year procured capacity is capped at 70% of the smallest annual expected resource need across the contract period (§15)
• Bid evaluation: best price-quality ratio; quality = activation time + endurance; price evaluated per unit available capacity, per activation, and per unit delivered energy; activation time capped at 30% of the evaluation weight (§§17–19)
• Large production bids (>300 MW total installed capacity): subject to a financing-deficit test — Svk calculates it, Ei must approve before Svk can accept the bid, and the bid cannot exceed the calculated deficit (§20)
• Non-delivery penalty: a supplier who fails to deliver contracted availability owes compensation based on contracted capacity × non-availability duration, with a floor of at least the imbalance price (obalanspris) (§14) — a different mechanism from the reserve’s own system-wide activation-price effect below
• BSP/BRP overlap prohibited: strategic reserve suppliers cannot simultaneously offer bids into the mFRR market during reserve activation periods — prevents double-counting
• Geographic scope: applies only in SE3 and SE4 (§6.1), reflecting that capacity risk is concentrated in Sweden’s southern consumption zones; a resource outside these zones may still qualify if Svk assesses how much of its power can technically reach the zones during a shortage
• Cross-border resources: a resource in another state may participate only if that state applies the EU Electricity Market Regulation and its grid is directly interconnected with Sweden’s (§§10–11)
• Excluded providers: firms in financial difficulty or subject to an EC illegal-aid repayment order cannot be capacity providers (§22)
• Activation price: when activated, sets the imbalance price at VoLL or 1 EUR above the intraday technical price cap — whichever is higher; this signals true scarcity to the market (§21 constrains activation to what’s necessary for national balance, and requires the reserve not unnecessarily distort market price formation)
• Funding: fees are based on electricity withdrawn for consumption at SE3/SE4 withdrawal points (§24); the balansansvarsavtalet was amended to replace “effektreserv” with “strategisk reserv” and to limit the levy to southern bidding areas

EU state aid approval was granted 29 July 2025, EC case SA.112968 (2025/N). (Source - Svk Kraftbalansen Höst 2025, Source - Forordning 2025-835 Kapacitetsmekanism (2025))

Transition from effektreserv

The effektreserv was Sweden’s previous standby capacity mechanism — primarily fossil-fueled units contracted by Svk as an emergency backstop. It had operated for approximately two decades. The mechanism was terminated in March 2025 and was replaced by the new Lag 2025:50 / Förordning 2025:835 framework (the exact end date was 15 March 2025 per Svk’s Kraftbalansen autumn 2025).

Överbelastningsreserv as bridge (January 2025): before the strategisk reserv framework was fully operational, Svk procured a new instrument — överbelastningsreserv — through an open procurement in November 2024 when existing störningsreserv contracts expired. The instrument was broader than the old störningsreserv: both production and consumption resources participated, and the capability systemdriftskompensation was included. Contracts began January 2025. This was a separate instrument from the strategisk reserv and was designed to address grid-level capacity shortfalls (overloads) rather than system-wide scarcity. (Source - Elmarknadsrådet Meetings 3 and 4 2024 (Sep-Nov))

The transition left a gap in winter 2025/2026 readiness: EU approval came in July 2025, procurement was conducted autumn 2025, and the first auction failed entirely (see below). Sweden entered winter 2025/2026 without a contracted strategic reserve.

Procurement history

First procurement (cancelled October 2025) — FAILED

• Target: 800 MW for winter 2025/2026
• Timing: run ahead of winter 2025/26 and cancelled without award in October 2025. The primary sources give no start month — Svk’s report says only “inför vintern” and the Elmarknadsrådet minutes record just the October cancellation — so any specific season for the opening is unsourced. (Source - Svk Kraftbalansen Höst 2025, Source - Elmarknadsrådet Meeting 1 February 2026)
• Bids received: 713 MW total
• Result: no capacity contracted — every submitted bid exceeded Svk’s CONE price cap
• Why: the Swedish CONE (Cost of New Entry) was benchmarked to household demand response — the cheapest theoretical new-entry resource. The resources that actually submitted bids were production-side units (generators, diesel, gas) with substantially higher true entry costs. All production bids exceeded the household-DR-based cap, so nothing cleared. (Source - Svk Kraftbalansen Höst 2025)

Svk reviewed two options after the failure: (1) reinterpret the CONE methodology to allow different reference technologies; (2) procure smaller volumes at lower cost-effectiveness thresholds. (Source - Elmarknadsrådet Meetings 3 and 4 2025 (Sep-Nov))

Winter 2025/2026 without reserve: Svk judged that the ~1,000 MW normal-winter surplus margin meant no immediate adequacy threat. The system held — through high nuclear output and Nordic interconnection, not through demand flexibility or a strategic reserve.

Second procurement (winter 2025/2026) — SUCCEEDED

• Volume contracted: 350 MW
• Suppliers: Sydkraft Termisk Kraft (Karlshamnsverket, SE4) — 330 MW; Mälarenergi Kraftvärme (Aros G4, Västerås, SE3) — 20 MW
• Active period: 15 January 2026 – 15 March 2026
• Activation: the reserve maintained 100% availability and was never activated — the market balanced without it despite an unusually cold spell in January 2026 (peak load 24,800 MWh/h on 12 January, the highest in years)
• LOLE impact: from 1.6h → 1.2h (Source - Elmarknadsrådet Meeting 1 February 2026)

The procurement model was redesigned between the first and second attempt to link payment more directly to LOLE reduction (LOLE-based willingness-to-pay methodology).

Third procurement (winter 2026/2027) — IN PROGRESS, tender phase open

• Contract period: 16 November 2026 – 15 March 2027
• Geographic scope: SE3/SE4, unchanged
• Process: supplier qualification (leverantörskvalificering) via the e-Avrop platform is complete; as of 4 September 2026, Svk has opened the tender/bid-invitation phase — qualified suppliers are automatically invited via e-Avrop to submit bids
• Not yet published: target volume and price cap design for this cycle — still unconfirmed even at the tender-invitation stage
• Supply context (7 October 2026): Energimyndigheten sees an elevated risk of higher electricity prices this winter but no power shortage; contributing factors are reservoirs at 74.7 % in Sweden and 67.8 % in Norway in week 39, a Nordic hydrological balance of about −15 TWh, and nuclear outages running to 31 October at Ringhals 3, 17 November at Forsmark 1 and 30 November at Ringhals 4 (Source - Energimyndigheten Sveriges Energiläge v. 41 (2026-10-07))

(Source - Svk Strategisk Reserv Upphandling 2026-2027 (2026))

The CONE paradox

The first procurement failure is analytically significant beyond the operational setback. The Swedish CONE was calibrated to household demand response — the cheapest category of potential new-entry resource. This created an internal contradiction:

• The mechanism’s design implicitly assumed that price-elastic demand response would be the marginal bidder
• In practice, household demand response did not participate in the auction
• Production-side resources did participate but faced a price cap below their actual costs
• The cap, intended to prevent overcompensation, instead prevented any contracting at all

The failure is therefore a measurement of Sweden’s demand-response underdevelopment: if cheap demand-side flexibility existed in the quantity and form assumed by the CONE calculation, the auction would have cleared. It did not. See Capacity Adequacy and Flexibility as the Missing Reserve for the broader adequacy implications.

A separate, structural reason demand response is underrepresented sits in the statute itself: Förordning 2025:835 §7 only permits a demand-flexibility resource into the reserve if it can be assumed the resource would otherwise not be used — genuinely idle backup capacity, not capacity redirected from an existing market role (e.g. an aggregator’s local flex market or balancing market position). This anti-cannibalization bar is a real eligibility constraint on top of the CONE pricing problem, not just a pricing-driven absence. (Source - Forordning 2025-835 Kapacitetsmekanism (2025))

Ei’s CONE/VoLL review (with results expected autumn 2026) is specifically tasked with re-evaluating whether the reference technology remains appropriate and whether VoLL is correctly calibrated. A revised CONE would be the most direct fix for making the mechanism functional across procurement cycles.

Adequacy context

The strategisk reserv is a small mechanism relative to Sweden’s adequacy gap. ERAA 2025 (the EU-wide European Resource Adequacy Assessment) shows Sweden’s LOLE significantly exceeding the 1 h/year adequacy norm through 2035:

The volume needed to meet the 1h norm is 750–1,100 MW; the strategisk reserv can realistically procure ~350 MW — leaving a residual gap of 400–750 MW. If Ei’s autumn 2026 norm review relaxes the adequacy standard to ~3h LOLE (a plausible outcome), the gap largely disappears, and 350 MW procurement suffices. The Ei norm review is therefore the single most consequential near-term decision for whether the strategisk reserv is structurally adequate. See Capacity Adequacy and Flexibility as the Missing Reserve › The adequacy gap is real and growing for the precise ERAA2025 figures charted against the norm.

See Capacity Adequacy and Flexibility as the Missing Reserve for the full adequacy analysis, including why nuclear maintenance scheduling, Aurora Line, and demand flexibility — not the reserve itself — determine Sweden’s actual security of supply.

Regulatory milestones

Key dates tracked in the regulatory timeline:

• March 2025 — effektreserv terminated
• July 2025 — EU Commission state aid approval
• October 1, 2025 — Förordning 2025:835 in force
• October 2025 — first procurement closed (failed)
• January 8, 2026 — second procurement contracted (350 MW)
• May 15, 2026 — third procurement supplier-qualification deadline (per the process snapshot; likely already past by the time of reading)
• September 4, 2026 — third procurement tender/bid-invitation phase opened (qualification complete)
• Autumn 2026 — Ei CONE/VoLL review result expected
• November 16, 2026 – March 15, 2027 — third procurement contract period

Consumption surcharge that finances the reserve

Lag (2025:50) lets Svk (until the end of 2026 “the system operator authority”) charge the balance responsible party whose balance responsibility a supplier needs to deliver at a withdrawal point, on the quantity withdrawn at the withdrawal points it covers; Svk may decide fees in individual cases and the decisions can be appealed to the administrative court. From 1 January 2027 the law names Svenska kraftnät and refers to the new electricity market act. (Source - Lag 2025-50 Finansiering Kapacitetsmekanism (2026))

In practice the tilläggsavgift för förbrukning is charged on weekdays 06–22 from 16 November to 15 March on BRPs’ consumption excluding network losses in concession-regulated grids in SE3 and SE4. It was 0.00 EUR/MWh for winter 2025/26. Svk bills continuously on actual consumption, reconciles after the season with an additional or credit invoice, and then takes a formal, appealable decision per BRP. The level for winter 2026/27 is to be announced in October 2026, because Svk is waiting for a possible decision on a new reliability norm; the stated ambition is to procure earlier in future years so the preliminary level is known well before the delivery period. (Source - Svk Avgifter Balansansvariga Parter (2026))

Related pages

• Svenska kraftnät — procures and operates the strategic reserve
• Balancing Markets — reserve activation sets imbalance price at VoLL; overlap restrictions with mFRR
• Capacity Adequacy and Flexibility as the Missing Reserve — strategic reserve in the broader adequacy framework
• Demand Response — household DR was the CONE reference technology; its absence explains the first procurement failure
• Bidding Areas — SE3/SE4 scope; capacity risk concentrated in southern zones
• Nordic Balancing Model — coordination with Nordic balancing frameworks

Data gaps

• Revised CONE methodology — whether Ei/Svk proposes a new reference technology after the 2025 failure (Ei CONE/VoLL review due autumn 2026)
• Third procurement — target volume, price cap design, and result for winter 2026/2027. Source - Svk Strategisk Reserv Upphandling 2026-2027 (2026) confirms the contract period (16 Nov 2026 – 15 Mar 2027, SE3/SE4) but its supplier-qualification snapshot (deadline 15 May 2026) is already stale as of this wiki’s 25 August 2026 update — a more current Svk notice is needed to establish actual process stage, target volume, price cap, and any result
• Demand-side participation — whether household demand response or industrial load-shedding has submitted bids in any procurement round, and on what terms