The UK has pushed through a quiet but important rewrite of capacity market rules. The Electricity Capacity (Amendment and Transitional Provision) Regulations 2026, made on 16 July and in force from 17 July 2026, amend the 2014 capacity market framework, the supplier payment rules and part of the 2019 regulations, including the removal of redundant standstill-era wording. DESNZ says the aim is to protect security of supply, keep the scheme working in a changing power mix and improve value for money for consumers. (commonsbusiness.parliament.uk) In practice, this is less about political drama and more about who has to post more cash, who gets paid later and who carries the risk when a project slips or a balance sheet weakens. That reading follows directly from the changes to termination fees, credit cover and supplier reconciliation set out in the Explanatory Memorandum and the accompanying rules package. (commonsbusiness.parliament.uk)

Capacity market legislation is easy to overlook until something goes wrong. The mechanism pays generators, storage operators, interconnectors and demand-side response providers to be available when the grid is tight, and ministers told peers on 7 July that it has helped support around 20GW of new capacity since 2014. That makes this instrument relevant well beyond the energy sector itself: it shapes revenue visibility for listed utilities, project developers, lenders and electricity suppliers. (hansard.parliament.uk) DESNZ's own memorandum says the package is meant to improve confidence that providers can meet their obligations, bring low-carbon technologies into the scheme more cleanly and keep the framework efficient as the system changes. Put simply, government wants dependable backup capacity without paying twice for the same asset. (commonsbusiness.parliament.uk)

One of the more practical changes sits at the junction between the capacity market and Contracts for Difference. Under the revised approach, an asset awarded a direct award CfD after a Secretary of State direction can still participate in the capacity market until that CfD support actually begins, as long as there is no overlap in support during the delivery period. DESNZ says the point is to allow a smoother handover from one support regime to the other rather than create a second subsidy stream. (commonsbusiness.parliament.uk) That matters most for extension and repowering projects where timing can be awkward. A developer may now have a clearer bridge between capacity revenues and future CfD revenues, which should help financing discussions, although peers did question whether auction-allocated CfD holders are being left on a different track. (commonsbusiness.parliament.uk)

The harder edge comes in delivery assurance. The regulations add four new termination fee bands and, in effect, lift fee and collateral levels by about 30% against their 2016 real-terms benchmark. For many new-build units, initial applicant credit cover moves from £10,000 to £13,000 per MW, while missing the financial commitment milestone can push that to £19,500 per MW. Unproven demand-side response projects move to £6,500 or £13,000 per MW, depending on the length of the agreement. (commonsbusiness.parliament.uk) DESNZ presents that as a reset rather than a clampdown. That is fair as far as inflation adjustment goes, but it still means a bigger cash call at the point smaller storage or flexibility developers are trying to secure finance, and peers in the Lords explicitly raised the risk that newer entrants could feel the squeeze more than incumbents. (commonsbusiness.parliament.uk)

The insolvency amendments are also more than legal housekeeping. Once a capacity market unit receives an insolvency-related termination notice, the Settlement Body must stop monthly capacity payments from that date and withhold credit using a pro-rated formula; if the notice is later withdrawn, the withheld amount can then be paid back. The Explanatory Memorandum says this is about making sure money is not paid out once insolvency proceedings are known about and about protecting value for consumers. (commonsbusiness.parliament.uk) For boards, creditors and lenders, the message is blunt. Capacity income can no longer be treated as sticky revenue once an insolvency event has been triggered, which raises the pressure on covenant monitoring, contingency funding and restructuring timetables for stressed assets. That is especially relevant for marginal plant that may depend heavily on capacity payments to remain financeable. (hansard.parliament.uk)

Suppliers should pay close attention to the settlement timetable. The supplier payment rules are being adjusted so Ofgem can direct an accelerated pattern of monthly and annual reconciliation runs, and peers described the shift as cutting final settlement from 14 months to four to line up with wider half-hourly settlement reform. For finance teams, that means less time between data submission, correction and cash movement. (commonsbusiness.parliament.uk) There is a smaller but useful operational change as well. If an IT failure blocks access to the EMR Delivery Body portal, NESO can extend the prequalification window by up to five working days and the Secretary of State can add a further five, with updated auction guidance required afterwards. That will not transform project economics, but it does reduce the chance of an administrative failure distorting an auction round. (commonsbusiness.parliament.uk)

Two final points matter for the market. First, the tougher credit cover rules are not being applied backwards: DESNZ says the increases are for future agreements or participants entering after the instrument comes into force, with transitional provisions preserving earlier thresholds for pre-existing applications. Second, ministers say there is no direct cost to business and no significant overall impact, which is why no fresh full impact assessment was prepared. (commonsbusiness.parliament.uk) That official assessment is probably too neat for the commercial reality. The cash cost may not be a new tax, but it is still a real financing test for smaller developers, suppliers and flexible assets. For investors, the signal from 17 July 2026 is clear enough: the capacity market remains open, but entry now comes with tighter collateral, faster settlement and less room for distress to go unnoticed. (hansard.parliament.uk)