Review of energy system operation during extreme heat
- Publication type:
- Transparency document
- Publication date:
- Topic:
- Electricity transmission,
- National Energy System Operator (NESO)
Allegations on actions and reporting of data by the National Energy System Operator (NESO) between 22 to 26 June 2026.
Claire Coutinho MP has raised concerns about the actions taken and reporting of data by NESO during the extreme heat period.
The main concerns raised were:
- poor record-keeping and whether system risk data was hidden
- improper influence on decision making
NESO has commissioned an independent external investigation.
We regulate NESO and will make sure that the review is transparent, impartial and has the right terms of reference to get to the facts about what happened.