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Datasets (7)
  • CSV
System
System Inertia
This dataset contains an estimate of the outturn inertia and market provided inertia for Great Britain Transmission System.
  • CSV
System
Stability Pathfinder service information
This dataset gives indicative information on the availability and utilisation of Stability Pathfinder contracts. The information is provided at a settlement period resolution for all contracted units…
  • CSV
System
System Frequency
This page holds the historic system frequency data for Great Britain at a 1 second resolution. It is the role of the National Grid ESO to keep the system frequency at 50 Hz, with a statutory limit of…
  • CSV
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…
  • CSV
Balancing costs
Great Britain System Inertia Bid and Offer Costs
This dataset provides indicative values for the average daily price (in £ per GVAs) for BM accepted offers tagged as being for System Inertia. It also includes the cost of bid actions required to…
  • CSV
System
System Inertia Cost
This data set gives indicative values for the average daily price (in £ per GVAs) for BM accepted offers tagged as being for System Inertia. The tagging process identifies the most likely main reason…
  • XLSX
  • CSV
  • XLSM
Ancillary services
Firm Frequency Response (FFR) Post Tender Reports
The Firm Frequency Response (FFR) post tender reports are published following each monthly tender. They indicate which tenders were accepted and rejected and the information submitted for these…