P510 Balancing and Settlement Code (BSC) urgency decision

What changed

Ofgem rejected Flexitricity's request for urgency on BSC modification P510 on 16 April 2026. P510 proposed replacing the mutualised compensation arrangements introduced under P415 with direct compensation for Virtual Trading Party (VTP) actions in the wholesale market. The BSC Panel had recommended urgency by majority on 12 March, but Ofgem overruled that recommendation. Two related modifications — P509 and P511 — were considered alongside and also rejected for urgency.

P415, which took effect in 2024, opened wholesale market access to Virtual Lead Parties (VLPs) dispatching flexibility assets. To manage the settlement risk this created, P415 included a mutualised compensation fund: when VLP actions cause imbalance costs, the bill is spread across all BSC parties. Flexitricity raised P510 after evidence showed rising volumes and costs flowing through that fund, arguing the situation was deteriorating fast enough to warrant accelerated governance.

What this means in practice

The mutualisation continues. Every BSC party — generators, suppliers, traders — keeps paying a share of the compensation costs caused by VLP activity, regardless of whether they had anything to do with generating those costs. This is the textbook commons problem: VLPs face no direct cost consequence for the imbalance they create, so there is no price signal disciplining their behaviour. The parties bearing the cost have no mechanism to avoid it.

Flexitricity's evidence of rising fund volumes matters here. P415's compensation arrangement was designed when VLP participation was small. As VLP volumes grow, the mutualised cost grows with them — but the cost signal remains diffuse. No individual BSC party sees a bill large enough to act on, while the aggregate burden rises. This is Olson's logic of collective action: concentrated benefits for VLPs, dispersed costs for everyone else.

P510 would have changed the cost allocation from mutualised to causal. Parties whose actions triggered compensation would pay directly. That is a straightforward application of the principle that costs should sit with those who cause them — not because it is fair, but because it is the only structure that produces the right incentive. A VLP facing the direct cost of its imbalance will either price that cost into its dispatch decisions or exit. Either outcome is efficient. The current arrangement, where the cost is invisible to the party causing it, is not.

Rejecting urgency does not kill P510. It means the modification progresses through standard BSC timescales — workgroup assessment, consultation, Panel recommendation, Ofgem decision — which typically takes 6-12 months. During that period, the mutualised fund continues to accumulate costs that would not exist under the proposed direct compensation model.

The practical question is how much the fund grows before the governance process concludes. Flexitricity raised urgency precisely because the trajectory was steep. Every month of delay is a month where VLP-caused costs are socialised rather than allocated. The parties paying those costs — predominantly suppliers and generators — have no recourse in the interim.

The rejection also signals something about Ofgem's tolerance for the P415 framework. P415 was controversial when approved. The mutualisation mechanism was the political compromise that enabled VLP market access: incumbents accepted new competition in exchange for a safety net that spread the settlement risk. Ofgem's refusal to accelerate reform of that mechanism suggests it is not yet persuaded that the costs have become material enough to warrant disrupting the standard process — or that it is reluctant to unpick the P415 settlement so soon after implementation.

What happens next

P510 enters the standard BSC modification track. The expected sequence:

- Workgroup phase (Q2-Q3 2026): Technical assessment of direct compensation mechanisms, data gathering on fund volumes and cost drivers, definition of the solution. - Industry consultation (Q3-Q4 2026): Draft modification report circulated to BSC parties. This is where generators and suppliers will submit evidence on the cost burden they are bearing under the current mutualisation. - Panel recommendation and Ofgem decision (late 2026 or early 2027): Final modification report goes to the BSC Panel, then to Ofgem for decision.

P509 and P511, which address related aspects of VLP settlement arrangements, will progress on parallel timescales. The three modifications may converge or be consolidated during the workgroup phase — Elexon and the BSC Panel will need to manage the interaction between them.

The key variable is the fund data. If mutualised compensation costs continue to rise through 2026, the case for P510 strengthens with every monthly settlement run. Flexitricity and other parties can use that data in the consultation phase. Conversely, if VLP volumes stabilise or fall, the urgency argument weakens and the modification may face resistance from VLPs who benefit from the current cost socialisation.

Watch the monthly BSC settlement reports for fund size and growth rate. That data will determine whether P510 arrives as a necessary correction or a contested reallocation.