Balancing Services data from the Trading Operations Report


This page details highlighted electricity balancing services data from the previous month. This data is acquired from BSC Agents and inputted to the Trading Operation Monitoring Analysis System (TOMAS) database. 

To expand the graphs featured on the page, tap the double-headed arrow in the bottom right corner of the graph. 

Energy Balancing Actions  

Buy and Sell Balancing Services Volumes by Fuel Type 

The first graph displays the balancing services volumes in the Buy Stack and the second graph displays the balancing services volumes in the Sell Stack. These volumes were instructed by National Grid ESO to balance the GB electricity system. Actions in the Buy Stack increase the volume of energy on the system and actions in the Sell Stack decrease the volume of energy on the system.  

The fuel types are shown for balancing services providers that participated in the Balancing Mechanism. This graph also includes balancing volumes from Balancing Services Adjustment Actions (BSAAs). These actions are taken outside of the Balancing Mechanism and include, but are not limited to, balancing actions such as system-to-system services, Non-BM Short Term Operating Reserve (STOR) actions and forward contracted energy products. 


In March 2022 there were 803.65GWh of buy balancing services volumes instructed. The majority of the buy volume was provided by gas generation in the Balancing Mechanism. Gas has been the majority provider of buy balancing services volumes over the previous 13 months.   

Gas fuelled power stations are often the most economic plants for National Grid ESO to buy energy from that meet their technical requirements, even with the increase in gas prices. While there are other fuels for providing balancing services, these may have insufficient capacity to meet the full need, may have longer lead times to react or may not be available when required.  

In the Sell Stack there was 858.22GWh of sell balancing services volumes instructed in March 2022. The majority of the sell volume was provided by gas generation in the Balancing Mechanism while wind generation provided the majority of the sell volume in February. February 2022 has the highest volume of curtailed wind generation in the past 13 months. Wind generation can be curtailed, or bid down in the sell stack if there is insufficient electricity demand to meet the wind generation safely.   

Balancing Services Volumes as a Percentage of Generation 

This graph shows the Balancing Services Volumes from the Buy and Sell Stacks as a percentage of total generation. The chart uses latest run type data.  



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Volumes of Supplier Delivered Balancing Services 

This chart plots the monthly volumes of Supplier Delivered balancing services. These volumes are delivered either via a Virtual Lead Party or outside of the Balancing Mechanism through Applicable Balancing Services Volumes. These arrangements were introduced in 2020, via BSC Modifications P344 and P354. They allow for an electricity suppliers electricity volumes to be adjusted where flexible assets in their portfolio are providing balancing services to the Electricity System Operator.  

For the supplier’s volume to be adjusted correctly, either a Virtual Lead Party or National Grid ESO send MSID Pair Delivered Volumes. The Half Hourly Data Aggregator also sends metered volumes for the relevant MSID Pair. The Settlement Volume Allocation Agent (SVAA) then assigns these volumes to the correct supplier’s Balancing Mechanism Unit. This allows the volumes to be used in the calculation of Energy Imbalance Volume, so that a supplier does not receive Energy Imbalance Cashflow for delivered balancing services volumes. 

This data comes from the SAAI0142 dataflow. 


The latest MSID Pair data we have received for ABSVD volumes are for Settlement Dates in January 2021, where they have reached the RF run. These Supplier Delivered ABSVD volumes relate to one BSC Party. National Grid ESO have a BSC Obligation to send the MSID Pair Delivered Volume Data (P0282) to SVAA by no later than the 45th (calendar) day after the Applicable Balancing Service was provided. However, they have been unable to meet this obligation. Elexon have been working with National Grid ESO to monitor the P0282’s sent before the RF run for inclusion in Settlement. Elexon has raised a BSC dispute to correct suppliers’ ABSVD delivered volumes from May 2020 where the data was not sent in time for the RF run. There are nine BSC Parties who have Supplier Delivered Volumes for balancing services delivered by Virtual Lead Parties in the Balancing Mechanism.


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