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Datasets (114)
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Demand
National Demand Balancing Mechanism Units
This dataset contains a preliminary list of Balancing Mechanism units that make up National Demand. This is related to the Historic Demand Data published here
  • CSV
Balancing costs
Daily Balancing Services Use of System (BSUoS) Volume Data
The BSUoS charge recovers the cost of day-to-day operation of the transmission system. Generators and suppliers are liable for these charges, which are calculated daily as a flat tariff for all users…
  • CSV
Balancing costs
Daily Balancing Services Use of System (BSUoS) Cost Data
The BSUoS charge recovers the cost of day-to-day operation of the transmission system. Generators and suppliers are liable for these charges, which are calculated daily as a flat tariff for all users…
  • CSV
Interconnectors
ElecLink - NESO's Net Transfer Capacity
These are the values submitted by NESO to the interconnector capacity calculation processes which restrict the maximum GB import and export interconnector flows. The values are submitted in MW per…,…
  • CSV
Trading
Index Linked Contracted Energy Volume
Index Linked Contract can be used by National Grid ESO to meet the voltage voltage requirement . The contract is normally enacted in the morning ahead of the power exchange auction. The generator…
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Ancillary services
Ancillary Services Important Industry Notifications
The dataset contains the latest update on important ancillary services procurement changes. Please subscribe to get the latest update.
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Constraint management
24 Months Ahead Constraint Limits
This dataset contains Mega Watt constraint limits for the main boundaries on the transmission system on weekly bases for 24 months ahead.
  • CSV
Constraint management
24 Months Ahead Constraint Cost Forecast
This dataset contains the 24-month ahead constraint costs on a monthly basis for the main boundaries on the transmission system. These costs are the costs of managing constraint boundaries (for…
  • CSV
Data Portal changes and known issues
Data Portal: Planned Changes & Known Issues
Here you will find details of upcoming changes to the NESO Data Portal along with any known issues that we are working to resolve. If you have encountered any issues not captured in this table please…
  • CSV
Network charges
Transmission Network Use of System (TNUoS) Tariffs
This dataset contains a breakdown of all the Transmission Network Use of System (TNUoS) tariff elements of which are forecasted and set by the revenue team at National Grid ESO. These files will be…