National Energy System Operator (NESO)
Role
NESO is the new independent national energy system operator, created by the Planning and Infrastructure Act 2025. It takes over functions previously split between National Grid ESO (electricity system operation) and other bodies, and is given new responsibilities for strategic spatial energy planning and grid connection queue reform.
NESO is critical to the Clean Power 2030 delivery chain: the grid connection queue was identified as one of the primary bottlenecks preventing new renewable capacity from coming online.
Key functions
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Grid connection queue reform: NESO leads the reform of the connection queue, which had accumulated a backlog of projects unable to connect to the grid despite having planning permission. The queue reform is essential to realising already-consented offshore wind and solar capacity.
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Strategic Spatial Energy Plan (SSEP): NESO is responsible for producing the SSEP (expected 2026) — a spatial planning framework identifying where different types of generation and grid infrastructure should be located nationally. The SSEP is a milestone for resolving offshore wind siting conflicts (see clean-power-marine-environment).
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Electricity system operation: Ongoing responsibility for balancing supply and demand on the national grid as the mix shifts toward variable renewable sources.
Key context: grid connection queue
The Clean Power 2030 Action Plan identifies the grid connection queue as a critical constraint. As of the plan’s publication, projects with planning permission were facing multi-year waits to connect. NESO’s queue reform aims to:
- Remove speculative projects from the queue
- Prioritise projects that can genuinely deliver by 2030
- Accelerate connection for the 80 critical network and infrastructure projects identified in the Action Plan
Timeline
- Created under Planning and Infrastructure Act 2025 (Royal Assent: December 2025)
- SSEP due: 2026
Tensions
- planning-timelines-2030-targets — NESO and queue reform are new (PIA 2025); the backlog of grid connection delays accumulated under the old system is the immediate constraint on Clean Power 2030 delivery
- clean-power-marine-environment — SSEP will determine spatial allocation of offshore wind; marine environment tension unresolved until SSEP published