NESO Business Plan Guidance: decision

What changed

Ofgem has finalised the Business Plan Guidance that governs how NESO must construct its business plan submissions under the enduring regulatory framework. The guidance went live on 22 August 2025, issued under Part D of Condition G1 of NESO's licences. It is the operative output of the May 2025 consultation, which drew 14 responses; Ofgem's reasoning on those responses sits in the companion document, the Decision on the enduring regulatory framework for NESO, published the same day.

The two documents are deliberately paired. The enduring framework decision sets the accountability and incentive architecture; the Business Plan Guidance specifies what NESO must put on the page to satisfy it. The first plan written to this guidance covers the business plan cycle starting 1 April 2026, the point at which NESO exits the transitional BP3 arrangement and enters the steady-state regime. Ofgem published the guidance in tracked-changes form against the prior version so respondents can see exactly what moved between consultation and decision; a clean version is published alongside.

What this means in practice

This is procedural plumbing, not a cost or charging change. Nothing here alters TNUoS, connection charges, or what a developer pays. It matters because it sets the terms on which NESO will be held to account for the things it does control: the connections queue, network planning advice, the Centralised Strategic Network Plan, and system operation. The guidance is the template against which Ofgem will judge whether NESO's spending and performance commitments are adequate, and against which NESO's later regulatory outcomes (incentives, cost pass-through, any disallowance) will be assessed.

NESO is the party directly affected. From the 1 April 2026 cycle it must justify its expenditure, outputs, and performance targets in the structure Ofgem has prescribed rather than the bespoke BP3 format. The discipline runs one step removed from the market: the quality of NESO's business plan determines what NESO is funded to do and what it is incentivised to deliver, and NESO's delivery determines connection timelines and network build advice that developers and consumers ultimately bear. The cost is recovered through network charges regardless, so the relevant question is not the price but whether the accountability structure forces NESO to plan for throughput and delivery rather than for activity and headcount. That depends on whether the guidance ties funding to measurable outputs (connections offered, plans delivered to time) or to input justifications. The substance is in the tracked-changes PDF and the enduring framework decision, not in the announcement; the guidance document itself is 98KB, so the operative detail is concentrated and worth reading directly rather than inferred from the framing here.

For everyone else, the practical signal is timing. Anyone tracking the connections reform programme, the Strategic Spatial Energy Plan, or the Centralised Strategic Network Plan now knows the regulatory cycle those workstreams report into begins 1 April 2026 and runs to a fixed Ofgem-specified plan structure. NESO's commitments on queue reform and network planning will, from that point, be auditable against a business plan rather than against ad hoc statements.

What happens next

The immediate sequence is set. NESO must prepare and submit its first business plan under the enduring framework for the cycle commencing 1 April 2026. Ofgem will then assess that plan against this guidance, determine NESO's allowed funding and output commitments, and set the incentive package that flows from the enduring framework decision. Expect a submission window and an Ofgem assessment and determination process across late 2025 into 2026, with the funded plan in force from the April 2026 start date.

Three things are worth watching. First, the business plan itself: when NESO submits, the test is whether it commits to measurable delivery on connections and network planning or to input-justified expenditure. That is the document where the accountability regime either bites or does not. Second, the incentive determination: the enduring framework decision sets the architecture, but the calibrated incentives (what NESO is rewarded or penalised for, and how hard) typically follow in a separate Ofgem decision on the business plan. The risk is the standard rate-of-return pattern: if NESO is funded against costs incurred rather than outputs delivered, the incentive is to spend, not to clear the queue. Third, alignment with the connections reform timeline. The reformed queue and the Gate 2 process run on their own track; whether the April 2026 business plan cycle is the mechanism that holds NESO to its connections commitments, or a parallel process that does not, will determine whether this guidance has teeth.

For now this is a calendar marker and a structural prerequisite, not a decision that changes the cost stack. Its significance is entirely contingent on what NESO submits next April and how Ofgem funds it.