Flex›Source - Nordic Imbalance Settlement Handbook v5.2 (2025)

Source - 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.

Bibliographic information

  • Title: Nordic Imbalance Settlement Handbook
  • Version: 5.2
  • Date: 29 October 2025
  • Status: For contractual basis
  • Publisher: eSett Oy
  • URL: www.esett.com
  • 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

RoleDefinition
eSett (ISR)Imbalance Settlement Responsible; daily settlement, invoicing, collateral monitoring
TSOPhysical balance; submit BRP/BSP data to eSett; financial counterparty for reserve capacity
BRPBalance Responsible Party; valid eSett imbalance settlement agreement + TSO balance agreement; responsible for balanced schedules
BSPBalancing Service Provider; valid eSett balancing service settlement agreement + TSO agreement; responsible for delivering reserved balancing capacity
RERetailer; must have BRP agreement for all MGAs where operating
DSOMetering and data reporting; registers metering points; reports to eSett
NEMONominated Electricity Market Operator (Nord Pool); reports day-ahead and intraday trades
SPService Provider; provides operational/reporting services to BRPs, BSPs, REs, DSOs
MDAMetered Data Aggregator; national hub aggregating DSO metering data (e.g., Swedish future datahanteringsverktyg role)

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 that has a valid agreement with a TSO regarding balancing services, does automatically also hold the market role and obligations of a BSP.” 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 Balance Responsible Parties of suppliers. Compensation occurs when there is independent aggregation that impacts the suppliers’ resources.”

Key elements of the compensation architecture:

  • VoAA (Value of Avoided Activation): the counterfactual value used in imbalance pricing — what it would have cost to activate the marginal unit if the aggregator had not reduced the affected BRP’s imbalance
  • Incentivizing Component (IC): an additional financial component designed to incentivize accurate real-time balancing by BRPs
  • The compensation mechanism is the settlement-layer infrastructure for cross-BRP aggregation — when an independent aggregator activates resources from a customer whose BRP did not plan for the reduction, eSett facilitates the resulting financial transfer

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 (VoAA + IC)
  3. Confirmation that free-standing BSP is architecturally supported at Nordic level
  4. The 15-minute ISP as the operative settlement unit