Göteborg Energi Nät

Sweden’s largest urban DSO by city concentration, operating the distribution grid in Gothenburg — Sweden’s second largest city. A wholly owned subsidiary of Göteborg Energi AB (municipal energy company). Formally Göteborg Energi Nät AB, abbreviated GENAB in market contexts. One of the two DSOs operating Effekthandel Väst, Sweden’s highest-volume local flexibility market.

Overview

Roles

• Grid owner/operator: distributes electricity at medium and low voltage across Gothenburg
• Flexibility market operator: co-runs Effekthandel Väst together with Mölndal Energi Elnät
• Tariff innovator: early adopter of tidsindelade effektavgifter (time-divided demand tariffs) in Sweden
• Data infrastructure participant: collaborated with RISE on the grid price API

Göteborg Energi AB group

GENAB is the network subsidiary of Göteborg Energi AB, a municipal energy company owned by the City of Gothenburg. The group also includes activities in district heating, cooling, and energy retail. In the flexibility market context, “Göteborg Energi” often refers to the group, while “GENAB” or “Göteborg Energi Nät” refers specifically to the network/DSO entity.

Network structure

GENAB’s local grid is an urban city network with high customer density. It owns its own 130 kV network (unusual for a DSO — most connect to a regional company’s 130 kV). Grid structure: 130 kV → 130/10 kV substations → switchable 10 kV ring feeders → radial 0.4 kV. Approximately 270,000 customers. Three delområden: Area A and Area B connect to Vattenfall Eldistribution’s regional network; Area C connects to Ellevio.

(Source - GENAB Nätutvecklingsplan 2025-2034 (2024))

Current situation and capacity outlook

GENAB faces a significant capacity bottleneck growing from 2027 onwards, driven primarily by industrial electrification, harbour electrification, and heavy transport charging — concentrated in Area A (Hisingen and harbour districts). The DNDP provides precise three-area forecasts: (Source - GENAB Nätutvecklingsplan 2025-2034 (2024))

Historical baseline (2022–2023 mean)

Capacity forecast 2025–2034

Growth vs 2022–2023 mean: Area A +92% by 2034; Area B +12%; Area C +21%. The DNDP uses a normalkall vinterdag (normal cold winter day) as the planning basis with 1% annual efficiency reduction from existing customers.

Area A growth is almost entirely driven by large point loads: harbour electrification for shipping (A6, +80 MW), Tuve–Hamnen harbour cable (A1, +120 MW), heavy transport charging at Bäckebol (A5, +20 MW), new industrial connections at Låssby (A4), and urban development at Norra Älvstaden (A2, +80 MW) and Säve airfield (A3, +80 MW).

Flexibility needs and tools

Quantified flexibility need

The DNDP quantifies three dimensions of flex need: MW peak, GWh/year energy, hours/year, and occasions/year — enabling appropriate tool selection beyond the EIFS 2024:1 MW minimum. (Source - GENAB Nätutvecklingsplan 2025-2034 (2024))

MW need (Tabell 7):

GWh/hours/occasions need (Tabell 8):

The ranges reflect uncertainty in when regional network upgrades (Vattenfall Eldistribution) will be commissioned. Note: these are network-level needs, not the entire forecast demand — they represent the residual after local grid investment, regional network capacity, and local plannable production are accounted for.

Kapacitetsprogrammet

GENAB has launched Kapacitetsprogrammet — a dedicated programme to build and enable flexibility resources and other capacity management tools alongside the traditional grid investment programme. The programme layers tools by operational state:

• Normal mode: Tariffer + Energieffektivisering (passive)
• Strained mode: Ökad kapacitet från överliggande nät + Effekthandel Väst (market-based)
• Overload risk: Planerbar produktion + Villkorade avtal (backstop dispatch)

Five-step planning hierarchy

GENAB uses a five-step structured approach to each new capacity need:

1. Tänk om — reconsider the need with the customer
2. Optimera — free capacity by reconfiguration or risk-based approval
3. Avtala — sign villkorade avtal and/or flexibility agreements (Step 3 = where flexibility markets and conditional connections sit)
4. Bygg om — minor network reinforcements
5. Bygg nytt — new cable routes, substations

Planerbar produktion (local plannable production)

The DNDP identifies local CHP plants and gas turbines connected to GENAB’s network as high-potential tools. These currently run only sporadically or are idle, but could provide sustained MW-hour capacity during cold winter peaks. GENAB assesses that one MW of plannable production can be treated as equivalent to one MW of additional transmission capacity. Contract forms enabling long-term cost-effective procurement are being developed.

Villkorade avtal — GENAB’s specific design

In 2023, GENAB introduced villkorade avtal for all new connections above 1 MW:

• Every customer requesting or expanding to ≥1 MW receives 1 MW as guaranteed capacity (garanterad effekt)
• Remaining capacity above 1 MW is villkorad (conditional/curtailable)
• GENAB’s explicit philosophy: “Vi ser detta som en sista åtgärd och inte som en aktiv flexresurs där målet är att de villkorade avtalen aldrig kommer aktiveras” — villkorade avtal are the absolute last resort; the goal is they are never activated

(Source - GENAB Nätutvecklingsplan 2025-2034 (2024))

Effekthandel Väst

GENAB co-operates Effekthandel Väst alongside Mölndal Energi Elnät AB (MENAB). The market uses the NODES platform. Origin: when early capacity forecasts showed a potential shortfall, GENAB launched the market in season 2021/22 — purpose-built as a capacity management tool. The DNDP positions Effekthandel Väst as the primary non-wire tool for addressing hour-scale capacity shortfalls in Strained mode. (Source - GENAB Nätutvecklingsplan 2025-2034 (2024))

Key outcomes from Season 4 (V2024/25):

• 27 FSPs, 539 registered resources in the Göteborg sub-market
• 930 MWh total activated volume (Göteborg + Mölndal, all products) — roughly doubled vs Season 3
• World-first V2G delivery: in March 2025, four Volvo Cars EVs delivered 111 kWh across 2 activations, the first time V2G served a local DSO flexibility market anywhere in the world

See Effekthandel Väst for full market data and product details.

Tidsindelade effektavgifter

GENAB introduced tidsindelade effektavgifter (time-divided demand tariffs) on a voluntary basis from 5 February 2025. As of the June 2025 report, more than 1,100 customers had enrolled. Behavioral data from the first season:

• −13% consumption drop at 07:00 — the moment peak-pricing begins in the morning; customers proactively shift consumption before the high-tariff period starts
• +16% consumption rebound at 20:00 — the moment the peak-pricing period ends in the evening; customers resume deferred consumption, creating a secondary demand peak

Design implication: the rebound effect at 20:00 is expected but non-trivial. Time-divided tariff design must account for rebound peaks, not just peak reduction. GENAB is testing a dual-tariff model that separates the energy price signal (spot) from the capacity signal (effektavgift) to reduce the conflicting incentive problem — see Demand Response › Effekttariffer — the double-edged price signal.

Regulatory context: GENAB is one of five DSOs named in Ei’s April 2026 effektavgifter tillsyn. Ei’s PM2026:07 documents GENAB’s design in detail and concludes it is compliant with current regulations (no orders issued). Key details from the supervisory review:

• Ordinarie (standard) model: billing basis is the average of the three highest timmedeleffekter occurring in different calendar days during the month; no time differentiation; GENAB has paused further development of the ordinarie model pending Ei’s forthcoming new rules
• Valbar (optional) model: adds time differentiation (höglast vs. låglastavgift component) and a customer-chosen capacity level (effektnivå) that determines billing — gives customers with load flexibility stronger price signals and control; both models available simultaneously; strong-signal customers can self-select into the valbar model
• Historical adjustment: GENAB previously calculated billing from the single highest hour; adjusted to 3-hour average to reduce month-to-month variability — an early iteration of model development
• Revenue neutrality: GENAB’s effektavgift was introduced with the intent of being intäktsneutral at the total level; some redistribution between customers occurred

(Source - Ei Tillsyn Elnätsavgifter (2026), Source - Ei Konsekvensutredning EIFS 2022-1 Upphävande (2026), Source - Ei PM2026-07 Effektavgift Supervision)

(Source - Göteborg Energi Elektrifieringsrapporten nr 1 (2025))

Battery storage and BESS barriers

GENAB has active BESS integration through Effekthandel Väst, where CheckWatt’s portfolio of ~500 batteries / 5.5 MW is the largest aggregated resource. Svenska kraftnät has announced multi-year capacity service contracts for the Hisingen and Stenungsund areas, beginning around 2027 — the first structured long-term revenue certainty for large BESS in Sweden beyond spot arbitrage and FCR markets.

The primary practical barrier to BESS deployment in GENAB’s service area is bygglov (building permits). Urban Gothenburg faces planning constraints that delay BESS installation by months, particularly at high-density locations where congestion relief is most valuable.

A finding from Energiforsk research (cited in Elektrifieringsrapporten): the binding constraint for connecting BESS to the grid is transfer capacity, not voltage quality. This means more BESS can be connected to existing infrastructure than previously assumed — the right investment focus is transfer capacity improvement, not voltage quality upgrades. (Source - Göteborg Energi Elektrifieringsrapporten nr 1 (2025))

RISE API for grid prices

GENAB collaborated with (or adopted) the RISE open API for network tariff data, published in March 2025. This free, standardized API provides real-time network tariff data in a machine-readable format — enabling aggregators and device controllers to factor local tariff signals into optimization algorithms. This directly addresses one of the structural conditions for unlocking aggregated flexibility identified in Aggregation › Nine structural conditions. (Source - Göteborg Energi Elektrifieringsrapporten nr 1 (2025))

Relevance to flexibility

GENAB occupies a distinctive position in the Swedish flexibility landscape:

• Highest-volume local market: Effekthandel Väst is the largest active Swedish flex market by volume
• Urban congestion context: Gothenburg’s grid faces sharp electrification-driven load growth concentrated in industrial nodes (Hisingen, Stenungsund) and urban residential expansion
• Innovation orientation: V2G first, voluntary tidsindelade effektavgifter, dual-tariff model, RISE API — GENAB is a test-bed for new flexibility mechanisms
• TSO interface: Svk’s capacity service contracts for GENAB’s service area signal that TSO-level intervention is expected as a supplement to the local market around 2027–2028

Related pages

• Effekthandel Väst — the flex market GENAB co-operates
• NODES — the platform used
• Flexibility Market — Swedish market landscape
• Energy Storage — BESS barriers and Svk capacity services
• Demand Response — tidsindelade effektavgifter design and behavioral outcomes
• Aggregation — CheckWatt case study
• Svenska kraftnät — Svk capacity services for Hisingen/Stenungsund
• Villkorade Avtal — GENAB’s specific design (1 MW threshold, “last resort” philosophy)
• Distribution Network Development Plan — GENAB DNDP as case study for granular flex quantification

Data gaps

• Actual results from tidsindelade effektavgifter: volumes shifted, revenue impact, customer satisfaction (beyond the first-season behavioral summary)
• Port of Gothenburg electrification load estimates and potential flex contribution
• Göteborg Energi Nät’s approach to NC DR T&C compliance — planned FIS, prequalification design
• Planerbar produktion — which CHP plants and gas turbines are under consideration; contract form development status