Balance Responsible Party (BRP)

A Balance Responsible Party is a market participant that has signed a balance agreement with the Transmission System Operator and accepts financial responsibility for any imbalance between its scheduled and actual electricity consumption or production in each trading period. In Estonia, every retail supplier and every directly-trading large customer must be a BRP or be represented by one.

A Balance Responsible Party (BRP) is the financial counterparty to every wholesale electricity transaction in a control area. The role is defined in the Electricity Balancing Guideline (Commission Regulation (EU) 2017/2195, Article 18) and implemented in Estonian law via Elektrituruseadus § 11 (defining the BRP), § 43 (defining balance responsibility) and § 44 (open supply). Every kilowatt-hour that physically flows on the Estonian grid rolls up to one of the registered BRPs.

How balance responsibility works

Every market participant that produces, consumes, or trades electricity must either become a BRP itself or contract with one. Before gate closure on the day-ahead market, the BRP submits its final position — a schedule of how much it expects to deliver into and draw from the grid in each trading period — to the TSO. After delivery, the TSO measures actual flows, compares them to the schedule, and bills the BRP for any deviation at the imbalance price.

Settlement mechanics in Estonia

Estonia is transitioning the imbalance settlement period from one full hour to fifteen minutes under EBGL Article 53, in line with EU-wide convergence. The imbalance price is calculated separately for up- and down-regulation directions and reflects the activated balancing energy from BSPs in that period. In effect, a BRP pays roughly what it cost the TSO to fix its mistake.

Distinction from BSP

A BRP carries financial responsibility for keeping its portfolio balanced. A BSP delivers physical balancing services — frequency reserves — to the TSO. The same legal entity often holds both certifications, but the roles are separate: a BRP can exist without delivering reserves, and a BSP can sell reserves without taking imbalance risk on a portfolio.

Bilansileping — the balance agreement

The contractual instrument that establishes BRP status is the bilansileping (balance agreement) signed with Elering. Without it, no commercial activity is possible on the wholesale market. Volton holds a balance agreement with Elering and acts as a BRP for its retail customers and aggregated flexibility portfolio.

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What is a Balance Responsible Party (BRP)?

A BRP is a market participant that has signed a balance agreement with the TSO and accepts financial responsibility for any deviation between its scheduled and actual electricity position in each settlement period. The BRP submits day-ahead schedules to the TSO and pays the imbalance price for any deviation. In Estonia every retail supplier and every directly-trading large customer must be a BRP or be represented by one.

What's the difference between BRP and BSP?

Different roles. A BRP is responsible for keeping its own portfolio in balance and pays when its position deviates from schedule. A BSP actively offers flexibility back to the TSO to help balance the system, and gets paid when activated. The same legal entity can hold both roles, but the roles serve opposite directions: BRPs are the source of imbalance, BSPs are the source of corrective energy.

How do you become a BRP in Estonia?

Apply to Elering for a balance agreement. Requirements: an Estonian or EEA legal entity, a financial guarantee (typically a bank guarantee or cash collateral), Datahub integration, sub-metering at imbalance-settlement granularity, and twenty-four-hour operational availability. The Estonian register of active BRPs is short — around 10–15 active entities — and the bar to join is non-trivial.

How does a BRP get paid (or pay)?

Each settlement period the TSO measures the BRP's actual flows, compares against the schedule submitted day-ahead, and bills the imbalance volume at the per-MTU imbalance price (single pricing under EBGL Article 55). Short BRPs in an upregulated MTU pay; long BRPs in a downregulated MTU pay. The asymmetric spread is structural — the system is designed so being out of balance costs money.