PM0158 Changes to TNUoS timing protocols
- Publication type:
- Code modification
- Publication date:
- Topic:
- Offshore electricity transmission,
- Energy codes
- Subtopic:
- System operator - Transmission owner code (STC)
Outcome of proposed changes to TNUoS timing protocols, PM0158 amending the final OFTO submission deadline and forecasting data arrangements.
Details of outcome
The Authority has decided that modification PM0158 should not be made.
Code modification description
PM0158 was proposed by the National Energy System Operator (NESO) on 9 June 2026 to update the process for the provision of revenue forecasts by Transmission Owners (TOs) to NESO for use in Transmission Network Use of System (TNUoS) tariff forecast calculations.
Under the existing rules, NESO has between four and six calendar days between the finalisation of Offshore Transmission Owner (OFTO) revenues and the publication of final TNUoS tariffs. The modification proposed extending this lead time to 10 calendar days in most circumstances. It also proposed giving NESO a mechanism to request additional data from TOs and OFTOs with 60 days’ notice.
NESO believes that this modification would improve the provision of revenue forecast information and reduce time pressures during the publication of final TNUoS tariffs. The Authority found that the modification would not better facilitate the achievement of the System Operator Transmission Owner Code (STC) objective.