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Datasets (114)
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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…,…
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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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Demand Flexibility Service
Demand Flexibility Service
Demand Flexibility Service (DFS) allows the NESO to access additional flexibility. Email alerts are available for this dataset once subscribed, triggered by any modification to the files. The auction…
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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
Thermal Constraint Costs
Thermal constraints are taken when the amount of energy that would flow naturally from one region to another exceeds the capacity of the circuits connecting the two regions. This dataset provides…
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  • PDF
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.
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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…
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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…
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Balancing costs
Constraint Breakdown Costs and Volume
The publication consists of constraint breakdown information to provide additional transparency of why as ESO we are taking actions on the system. Please note that tags applied to actions can…
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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…