Definitions

FCR: Frequency Containment Reserve.

aFRR: automatic Frequency Restoration Reserve.

Specific mFRR: Specific manual Frequency Restoration Reserve - specific balancing bids with manual activation having a mobilization lead time of less than 13 minutes. The volume and the specific mFRR BEWAP contain activations for balancing only, including those of MEAS where applicable.

Specific RR: Specific Replacement Reserve - specific balancing bids with manual activation having a mobilization lead time of more than 13 minutes. The volume and the specific RR BEWAP contain activations for balancing only, including those of exchange point entities where applicable.

Non balancing activation: volume of energy activated on the balancing mechanism for the purpose of congestion, frequency ancillary services or reconstitution of reserves. (including activation of exchange points entities and MEAS where applicable).

Unintended exchanges (DeltaPi): Difference between scheduled exchanges and measured physicals flows at interconnections.

Imbalance Netting (IGCC): Imbalance Netting (International Grid Control Cooperation) - Volume of energy transferred at interconnections by implementing the remainder of imbalances.

Countertrading & XB Redispatching: Volume of activated energy resulting from countertrading and cross-border redispatching mechanisms.

TSO emergency contracts (MEAS – Mutual Emergency Assistance Service) : TSO emergency contracts Balance of energies exchanged between TSOs under emergency reserve-sharing agreements. The volumes and the associated prices are included in the imbalance settlement price only when requested by RTE.

BALIT (BALancing Inter-TSOs mechanism): Balance of energies exchanged between TSOs under balancing energy exchange contracts

Standard RR need satisfied by TERRE: Standard Replacement Reserve need requested by RTE and satisfied by the TERRE platform. This mechanism was discontinued in March 2022.

Imbalance: Sums of activated energies listed above (upward activations/imports counted negatively; downward activations down/exports counted positively)   

Trend: Upward if the overall imbalance of the French power system is negative or zero and downward in the opposite case.

ISP: Imbalance Settlement Price.

BEWAP: Balancing Energy volume Weighted Average Price.

BEMP: Balancing Energy Marginal Price.

Definitions

Energy volume activated for electric system balance: Sums of specific balancing bids activated for P = C balance reason and the standard RR need satisfied by TERRE platform.

Energy volume activated for congestion: Specific balancing bids activated to resolve congestion.

Energy volume activated for SSY: Specific balancing bids activated to reconstitute frequency ancillary services.

Energy volume activated for Marge: Specific balancing bids activated to reconstitute reserves.

Definitions

Energy volume activated, injection point: Energy volume activated by PTS or PDS injection balancing entities

Energy volume activated, extraction point: Energy volume activated by remotely-read and profiled consumption balancing entities

Energy volume activated, exchange point: Energy volume activated by exchange point balancing entities

Energy volume activated, Inter-TSO Balancing Exchange: Energy volume exchanged between TSOs under balancing energy exchange contracts

Definitions

Minimal price* : Lowest price of balancing energies activated downward for P=C balance (the price of aFRR energy used for the calculation is the volume-weighted average price of aFRR energy activated downward in France or abroad to satisfy RTE needs).

Maximal price* : Highest price of balancing energies bids activated upward for P=C balance (the price of aFRR energy used for the calculation is the volume-weighted average price of aFRR energy activated upward in France or abroad to satisfy RTE needs).

DMO : Mobilisation lead time of the specific balancing bid activated on the balancing mechanism.

DOmin : Minimum duration of use of the specific balancing bid activated on the balancing mechanism.
*An evolution is planned for Q1 2026 to publish the marginal prices of the balancing mechanism (excluding the price of aFRR energy) and thus ensure consistency between prices and DMO/DOmin.

Définitions

Ceiling/floor price: Price limit associated with the P=C balancing need requested by RTE to the TERRE platform and which can take the "at any cost” value.

Clearing price in France: marginal price defined, for the French scheduling area, by the TERRE platform.

Volume of activated RR standard bids: Aggregated volume of Replacement Reserve (RR) standard bids submitted by a French balancing service provider, shared by RTE to the TERRE platform and activated by the platform to meet RTE’s need or a foreign need.

Volume of RR Standard product bids submitted: Aggregated volume of Replacement Reserve (RR) standard bids submitted by a French balancing service provider and shared by RTE to the TERRE platform.

Restricted volume of RR standard bids: Volume of Replacement Reserve (RR) standard bids submitted by a French balancing service provider and made unavailable by RTE.

Definitions

aFRR need requested by RTE : Average value of the French scheduling area control error at 4 second intervals before correction from the IGCC and PICASSO platforms.

aFRR activated for French scheduling area : Average value of aFRR activated at 4 second intervals in France or abroad to cover French aFRR demand.

Volume weighted average price of aFRR activated for French scheduling area : Average of the aFRR activation prices to cover French aFRR demand, calculated based on the Cross-Border Marginal Price (when connected to PICASSO) or the Local Marginal Price (in Merit Order France) at 4 second intervals, and weighted by the volume of aFRR activated for France.

aFRR submitted volume in France : Aggregated aFRR energy bids submitted in France.

aFRR activated volume in France : Average value of the aFRR activated in France at 4 second intervals, regardless of the beneficiary TSO.

aFRR unavailable volume in France : Not Applicable (the concept of unavailable bid does not exist for French aFRR).

Volume weighted average price of aFRR submitted bids in France : Average price of aFRR bids submitted in France, weighted by the submitted volumes.