Nordic Imbalance Settlement Handbook v5.2 (2025)

Nordic Imbalance Settlement (NBS) Handbook, Version 5.2. The authoritative operational manual for the Nordic imbalance settlement system operated by eSett Oy. Status: “For contractual basis.” Updated twice yearly; v5.2 dated 29 October 2025. The primary reference for BRP/BSP roles, settlement calculations, compensation mechanics, and data exchange standards across Denmark, Finland, Norway, and Sweden.

Scope: Denmark, Finland, Norway, Sweden.

Structure (13 chapters + appendices)

1. Introduction — background, scope, eSett overview
2. Nordic Settlement Model — functions, roles, responsibilities, agreements
3. Settlement Structure Management — market entities, connections, schedules
4. Metering — metered data types, energy storage metering (Chapter 4.6)
5. Settlement Data Reporting — requirements, data flows, schedules
6. Imbalance Settlement — calculation, examples, reconciliation (Sweden only)
7. Pricing and Fees — imbalance pricing, fee structure
8. Invoicing — invoice contents, distribution, banking
9. Collateral and Risk Management — counterparty risk, collateral calculation
10. Communication — messaging, data standards (ENTSO-E XML / ebIX), online service
11. Market Behaviour Reporting — KPIs, sanctions
12. Change Log
13. Appendices — BRP requirements, Nordic Calendar, Swedish Profiling and Reconciliation

Key content

Settlement model

The NBS model provides a single Nordic interface for imbalance settlement. eSett performs settlement and invoicing on behalf of the four TSOs (Energinet, Fingrid, Statnett, Svenska kraftnät), which retain ultimate national responsibility. A single BRP uses one interface regardless of which Nordic country they operate in — the primary benefit of the harmonised model.

15-minute imbalance settlement period (ISP): The handbook states explicitly: “A 15-minute imbalance settlement period is applied.” This reflects the Nordic-wide 15-minute ISP, completed in Sweden by March 2025. All settlement calculations, reporting schedules, and bid structures are built around 15-minute periods.

Market participants and roles

Independent Aggregator: defined as “a BSP that provides balancing services with independent aggregation method.” This is the formal NBS terminology for what Swedish law and the NC DR framework call an independent aggregator. The definition confirms that within the NBS framework, the aggregation function is housed in the BSP role.

BSP and BRP relationship

The handbook documents a key structural feature: a BRP with a valid TSO balancing-services agreement automatically also holds the BSP market role and obligations. Conversely, a free-standing BSP (without a BRP agreement) can have a separate Balancing Service Settlement Agreement with eSett.

This is the formal NBS basis for the BSP/BRP split. The handbook’s treatment confirms that the split is architecturally supported at the Nordic settlement level — the constraint on free-standing BSPs in Sweden is a national-level Svk requirement, not a limitation of the eSett settlement infrastructure itself.

Compensation mechanism

The handbook defines Compensation as a financial transaction between Balancing Service Providers and the suppliers’ Balance Responsible Parties, arising when independent aggregation affects the suppliers’ resources (e.g., an aggregator’s up-activation of a customer’s heat pump reduces the supplier’s expected sales; without compensation, an independent aggregator would have no incentive to offer down-activation when prices are positive).

Compensation is priced separately from ordinary imbalances (Ch. 7.2): positive and negative compensation volumes use the same reference price, and that price is simply the day-ahead market price in the MBA — not VoAA or IC.

VoAA and IC belong to general imbalance pricing (Ch. 7.1), not to the compensation mechanism — they apply Nordic-wide to all BRPs’ ordinary imbalances, regardless of aggregation:

• VoAA (Value of Avoided Activation): used only in ISPs with no dominating direction of regulation (no balancing-energy activation in either direction, or equal activation both ways) — computed as the average of the lowest up-regulation bid and the highest down-regulation bid
• Incentivizing Component (IC): an adjustment added to VoAA (imbalance price = VoAA + IC, and IC can be positive or negative) so the imbalance price in these no-dominating-direction ISPs always equals the day-ahead market price

The compensation mechanism itself is the settlement-layer infrastructure for cross-BRP aggregation: when an independent aggregator activates resources from a customer whose BRP/supplier did not plan for the change, eSett calculates the compensation from delivered-reserve volumes reported using the “independent aggregation” method (aggregated per BRP, RE, and balancing sub-service, and per BSP and balancing sub-service) and facilitates the resulting financial transfer between the BSP and the supplier’s BRP.

Sweden has not yet implemented a functional compensation mechanism domestically (the centralt datahanteringsverktyg is the intended infrastructure). The NBS Handbook confirms that eSett’s architecture is ready to settle these transactions once national data plumbing is in place. (Source - Uppdrag Centralt Datahanteringsverktyg (2025))

Swedish specifics

• Reconciliation Settlement: eSett performs reconciliation only for Sweden (profiled consumption). Other countries manage their own reconciliation.
• Swedish Normal Time (SNT): settlement structure management in Sweden uses SNT (aligned with CET but no summer time changes) rather than CET/CEST used by other countries for operational settlement.
• Legal references: SFS 1997:857 (Ellag), EIFS 2023:1 (metering regulation)
• Appendix 3: Swedish Profiling and Reconciliation — detailed Swedish-specific settlement rules

Metering — Energy Storage (Chapter 4.6)

The handbook has a specific section on energy storage metering, reflecting the growing role of batteries in the settlement system. This covers how BESS in-/out-flows are metered and reported for settlement purposes — relevant for aggregators operating battery portfolios across multiple markets.

Communication standards

Data exchange uses ENTSO-E and ebIX® XML formats. Key resources:

• NBS User Guide and BRS (Business Requirement Specification) at ediel.org
• XML schemas and examples at ediel.org
• Online Service, Messaging Service, Information Service at esett.com

Relevance

The NBS Handbook is the primary operational reference for any entity seeking to participate in Nordic balancing markets as a BRP or BSP. For the Swedish flexibility market context, the most important elements are:

1. The formal independent aggregator definition (BSP with independent aggregation)
2. The compensation mechanism architecture (priced at the day-ahead market price, separate from the VoAA+IC pricing used for ordinary imbalances)
3. Confirmation that free-standing BSP is architecturally supported at Nordic level
4. The 15-minute ISP as the operative settlement unit

Related pages

• eSett — the entity this handbook governs; ownership, NBS model, Swedish role
• eSett’s Swedish Role Through NC DR Implementation — forward-looking analysis of how eSett’s Swedish role evolves as DHV is built and NC DR lands
• Balancing Markets — the markets this handbook governs
• Aggregation — independent aggregation, BSP/BRP, compensation
• Nordic Balancing Model — the broader Nordic architecture of which NBS is a component
• Svenska kraftnät — Swedish TSO; eSett shareholder
• Source - Svk BSP Avtal 5937-2 (2025) — Swedish BSP agreement that references eSett
• Source - Svk Artikel 18 Villkor Balansering (2024) — Swedish Art. 18 national balancing terms
• Source - EB GL (Regulation 2017-2195) — EU legal basis for imbalance settlement