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Datasets (7)
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Ancillary services
Dynamic Containment 4 Day Forecast
The dataset contains forecasts of our Dynamic Containment Low and High requirements for the next 4-days. The methodology uses forecasted demand, inertia, and response volumes as well as a view of the…
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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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  • CSV
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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Constraint management
Constraint Management Intertrip Service Information (CMIS)
This dataset gives information on the arming and disarming of units contracted under CMIS (previously known as Constraint Management Pathfinder). The information is provided for each instance of…,…
  • 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…
  • CSV
FES: Pathways to Net Zero
Regional breakdown of FES data (Electricity)
Data for 2024 will be made available on the 15th of July, 2024. Long term electricity forecasts per region covering demand, demand side response and distributed generation based on our Future Energy…
  • ZIP
  • CSV
Ancillary services
Phase 2: FFR Auction Results Summary
As part of our work on developing our balancing services we ran a weekly trial auction for Firm Frequency Response. The weekly auction trial results and order hash data are available here., Note:,…