SVK manages the national transmission grid and procures balancing services. The regional DSO — Ellevio, E.ON, or Vattenfall Eldistribution — is the body notified when a new battery connects to the local distribution network.

Swedish property owners evaluating a battery storage installation encounter several grid-related names — SVK, Ellevio, their electricity supplier — and are often uncertain which body is responsible for what. The distinction matters because the notification requirements, timelines, and responsibilities differ for each.

Svenska Kraftnät — the TSO

Svenska Kraftnät (SVK) is Sweden's national transmission system operator. It manages the high-voltage transmission grid (220 kV and 400 kV), maintains the national frequency balance, and procures frequency-stabilisation capacity through the balancing market — FCR-N, FCR-D, aFRR, and mFRR. SVK is the entity that pays capacity fees to battery operators (or their aggregators) for frequency-response availability.

SVK does not approve or process individual building connection changes. A commercial property owner installing a behind-the-meter battery system does not notify SVK directly — SVK's processes operate at portfolio level through aggregators, not at individual property level.

HNordic's energy SPV registers battery capacity with SVK's aggregation framework to participate in frequency-services markets. This registration is at the SPV level, aggregating the capacity of all properties in HNordic's portfolio into a single market-facing position. The individual property owner is not a party to this registration.

Regional DSOs — Ellevio, E.ON, Vattenfall Eldistribution

Sweden's distribution network is operated by regional distribution system operators. The three largest:

• Ellevio — Stockholm and parts of central Sweden
• E.ON — southern Sweden
• Vattenfall Eldistribution — northern Sweden and parts of the south

When a new storage asset connects to the local distribution network, the relevant regional DSO must be notified. The notification covers the battery's technical specification (capacity, power rating, connection point, protection settings), confirms compliance with DSO connection requirements (anti-islanding, earthing, protection relay coordination), and may trigger a brief assessment of local network capacity at the connection point.

HNordic manages this DSO notification as part of every Swedish installation. The process is similar in function to the G99 notification that DNOs receive for UK installations. The property owner does not contact the DSO independently.

The electricity supplier

The property's electricity supplier — Vattenfall, Fortum, Tibber, or whichever commercial entity holds the electricity supply contract — is not a regulatory or grid connection body. It is a commercial counterparty for the electricity tariff. Notification to the electricity supplier that the property now has on-site generation may be required (it may affect the net metering arrangement and export settlement), but this is separate from and secondary to the DSO connection notification.

What the property owner does and does not handle

Handled by HNordic as part of the installation:

• DSO connection notification (to the relevant regional DSO — Ellevio, E.ON, or Vattenfall Eldistribution)
• All technical documentation required for the notification (system specification, protection relay settings, anti-islanding compliance)
• SVK aggregation registration for the battery's balancing market capacity (via HNordic's energy SPV)

The property owner handles (at the commercial level):

• Notification to their electricity supplier of the new on-site generation asset (if required by their supply contract — HNordic can advise on this)

The property owner does not handle:

• Any direct interaction with SVK
• Any direct interaction with the regional DSO
• Any technical compliance submissions to the grid operator

Key takeaways

• SVK is Sweden's national TSO — it procures balancing services and manages the transmission grid. It does not approve individual property battery connections.
• The regional DSO (Ellevio, E.ON, or Vattenfall Eldistribution depending on location) is the body that must be notified when a new battery connects to the local distribution network.
• HNordic manages the DSO notification process as part of every Swedish installation. The property owner does not interact with the DSO directly.
• HNordic's energy SPV registers battery capacity with SVK through the aggregation framework — at portfolio level, not per property.
• The electricity supplier is a commercial entity separate from the grid notification process.

See also: What are FCR-D, FCR-N, aFRR, and mFRR? · How long does a HNordic installation take? · Full FAQ