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SYSTEM OPERATOR (TSO)

National Energy System Operator

System operator (TSO)Great Britain

The independent system operator for Great Britain.

Developments

8 tracked developments touching this entity.

15 SEPT 2026

Elexon FMAR consultation notice reconfirmed with no new design or milestone details

Consultation · FLEXIBILITY MARKETS · United Kingdom

11 SEPT 2026

NESO IEP5 presents finalized CBA methodology and cost estimates for Lowering BM Threshold and Shorter Settlement Period reforms

Consultation · BALANCING MARKETS · United Kingdom

11 SEPT 2026

NESO's IEP4 pre-read details CBA sensitivity/variant methodology and granular cost framework for GB balancing and settlement reforms

Proposal · BALANCING MARKETS · United Kingdom

10 SEPT 2026

NESO CMP405 Proposes Splitting TNUoS Year Round and Peak Security Locational Demand Signals to Reward Storage Import Location

Proposal · FLEXIBILITY MARKETS · United Kingdom

10 SEPT 2026

NESO's BSC Modification P502 moves through Assessment Procedure to create Supplier/Aggregator compensation mechanism for ABSVD-driven imbalance adjustments

Regulatory review · BALANCING MARKETS · Great Britain

09 SEPT 2026

Elexon confirms BSC Modification P511 fully implemented 24 August 2026, correcting Ofgem approval date to 10 August 2026

Go-live · BALANCING MARKETS · Great Britain (BSC / Elexon)

09 SEPT 2026

Elexon confirms P518 Report Phase Consultation on ABSVD data provision for CLASS has closed

Regulatory review · BALANCING MARKETS · Great Britain (BSC / Elexon)

04 SEPT 2026

Ofgem publishes BP3 performance assessment of NESO, flags connections reform and value-for-money gaps

Regulatory review · ENERGY MARKETS · Great Britain