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 thermal, voltage or stability constraints) plus the cost of meeting the voltage requirements. These costs do not include the cost of managing inertia or the largest loss of infeed.

NOTE: As part of our ongoing efforts to align with data management best practices and improve consistency across datasets, the column ids in the below datafile will be updated on 9th September 2026 as follows:

24 Months Ahead Constraint Cost Forecast:
Constraint Cost (£m) → Constraint Cost