Energy Supplier Financial Resilience Rules

After a run of supplier collapses left households facing disruption and left industry-wide costs to be recovered through bills, the regulator tightened the financial rules that energy suppliers must meet. In December 2021 Ofgem published an action plan on financial resilience that set out how it would improve its collection and reporting of information on suppliers, and it also introduced stress tests¹. Those measures sit alongside licence obligations covering both consumer standards and supplier financial resilience².

The rules apply to every company holding a gas or electricity supply licence, from the largest household names to the smallest challengers. They sit behind the protections households see day to day: the price cap, reviewed and set every three months³, the ban on backbilling for energy used more than 12 months ago⁴, and the guarantee that a failed supplier's customers are picked up rather than left without supply. Three energy companies hold an exemption from the price cap on default tariffs, having proved to Ofgem that they meet specific conditions⁵.

The financial resilience rules and their scope

The financial resilience rules are the regulator's answer to a period in which weakly capitalised suppliers failed at scale. The action plan published in December 2021 set out how Ofgem would improve its collection and reporting of information on suppliers, and introduced stress tests so that a supplier's exposure to market shocks could be examined before it became a collapse¹. The aim is to spot fragility early: a supplier that cannot withstand a wholesale price swing, or that has relied on customer credit balances to fund its operations, is a risk to its own customers and to everyone else's bills.

The rules apply to licensed suppliers across the board. The backbilling ban, for example, applies to all domestic and microbusiness suppliers⁴. The regulator's approach to fraud is part of the same picture: Ofgem takes a zero-tolerance approach, and suppliers must mitigate fraud risk with senior manager oversight, accurate reporting processes, and processes for handling suspected fraud, whistleblowing and allegations⁸.

Financial resilience also connects to how suppliers handle customer debt. Ofgem's debt strategy has four components⁹:

1. Resetting debt through a proposed Debt Relief Scheme
2. Reforming how suppliers manage debt by increasing debt standards
3. Helping to prevent debt from occurring by looking at billing and access to credit
4. Energy affordability support

A supplier's finances and its treatment of customers in difficulty are therefore regulated as two sides of the same obligation. For households, the significance is straightforward: these rules exist so that the energy supplier failures of the past are less likely to be repeated, and so that the cost of any failure is less likely to land on remaining customers.

Legal foundations of supplier duties under the supply licence

Every energy supplier operates under a licence granted by the regulator, and it is the licence, not a voluntary code, that carries the force of law behind supplier obligations. Ofgem's licence obligations cover both consumer standards and supplier financial resilience, including specific conditions such as SLC 4B.23 and SLC 4B.8d². These standard licence conditions are the hooks on which monitoring, enforcement and licence modification all hang.

The proposed Debt Relief Scheme illustrates how new obligations are added: a proposed condition, SLC24B.18 of the Gas and Electricity Supply Licences, would require suppliers to comply with reporting, assurance and auditing requirements, with data able to be requested under existing powers in SLC 5 of the Gas Supply Licence and Electricity Supply Licence⁸. The licence is therefore a living document, amended as risks change.

Licence conditions also govern how suppliers treat customers in financial difficulty. The Ability to Pay principles require suppliers to¹⁰:

• Give due consideration to appropriate credit management policies
• Make proactive contact with customers
• Understand individual customers' ability to pay
• Base repayment rates on ability to pay
• Ensure the customer understands the arrangement
• Monitor arrangements after they have been set up

Ofgem's rules also mean a supplier must work with a customer to agree a payment plan that is affordable¹¹. Beyond retail supply, licences carry obligations for environmental schemes, with Ofgem calculating suppliers' obligations, processing notifications, auditing suppliers, counter fraud, and reporting to the Secretary of State at DESNZ¹².

The regulator responsible: the Gas and Electricity Markets Authority

The body legally responsible for these rules is the Gas and Electricity Markets Authority, known as GEMA or "the Authority". Ofgem performs the day-to-day functions of GEMA, the statutory body responsible for administering the Domestic Renewable Heat Incentive in Great Britain¹³. The same structure appears across the regulator's schemes: the Feed-in Tariffs scheme is administered by the Gas and Electricity Markets Authority, whose day-to-day functions are performed by Ofgem¹⁴.

The Authority's legal personality shows up in the fine print of its own documents. In consultations, "the Gas and Electricity Markets Authority is the controller, (for ease of reference, 'Ofgem')" for personal data¹⁵, a formulation repeated across consultation documents over several years¹⁶. The statutory footing reaches back further: the Gas Act 1986, its subordinate legislation and related statutory instruments, namely licences and industry codes, together form the regime of economic regulation for gas transporters which Ofgem monitors and enforces¹⁷.

In practice, the Authority's role is supervisory. Ofgem monitors energy suppliers and network operators closely to make sure they meet the rules set out in licences, regulations and law, provide good customer service, and reply quickly to customers who contact them¹⁸. It does not run the companies or set their prices tariff by tariff; it sets the framework, watches compliance, and acts when the framework is breached. For a householder, the practical significance is that there is a named statutory body behind every rule described on this page, not an industry club.

Standard variable and default tariffs stay protected by the cap

The price cap is the protection most households actually feel. Ofgem, the UK's energy regulator, sets the price cap to protect people from a "loyalty penalty"³: the situation in which a customer who never switches is charged more than one who does.

The cap is made under the Domestic Gas and Electricity (Tariff Cap) Act 2018, which protects households on standard variable and default tariffs⁶. Who the cap covers is defined precisely: it protects existing and future domestic customers on standard variable and default tariffs¹⁹, and households on those tariffs more generally²⁰. Under the Act, Ofgem cannot set different cap levels for different suppliers and must protect default tariff customers²¹. That single constraint shapes the whole design: the cap is one number for all capped tariffs, not a bespoke allowance for each company's cost base.

The cap works through maximum unit rates. Regional rates published under the Energy Price Guarantee set out the maximum unit rates suppliers can charge for tariffs that are subject to the Ofgem price cap²², and between April and June 2023 average standing charges for customers on default tariffs remained capped in line with the levels set in Great Britain by Ofgem²³. A household on a fixed tariff is not covered by the cap, but the cap's existence disciplines the market around it. If a supplier fails and customers are moved to a deemed contract, it is the capped default tariff they land on.

Setting and reviewing the cap

Ofgem reviews and sets the price cap every three months, based on the cost of wholesale energy²⁴. The quarterly cycle is itself a product of the market turmoil: in August 2022, Ofgem announced that it would update the energy price cap every quarter rather than every six months¹, so that capped rates would track wholesale costs more closely instead of drifting away from them.

Each review works through the cap's building blocks:

The review process involves consultation before the levels are set, and the results are published as summaries of changes for each cap period²⁵. For households, the three-month rhythm means two things. First, a capped tariff is not a fixed price: the maximum rates move four times a year. Second, the cap is a ceiling, not a target, and suppliers can price below it, which is why comparing tariffs remains worthwhile even under the cap.

Suppliers the cap does not cover

Not every default tariff is capped. Three energy companies are exempt from the price cap on default energy tariffs⁵. The exemption is not a loophole: to obtain it, those companies had to prove to Ofgem that they have higher costs because they support renewables, that they go further than existing subsidies require, and that customers have actively chosen them⁵.

The conditions matter for what they rule out. A supplier cannot claim an exemption simply by calling itself green; it must demonstrate higher costs from genuinely supporting renewables, beyond what existing subsidies already pay for, and it must show that its customers made an active choice rather than being rolled onto a default tariff. The number is small, three companies, and the exemption is tied to the supplier, not the customer⁵.

Dividing costs among suppliers

Several schemes work by spreading costs across all licensed suppliers, so that no single company's customers bear the whole burden. The Feed-in Tariffs scheme offers the clearest example: Ofgem manages the Levelisation process, ensuring that each participating licensed electricity supplier pays or receives the right amount of money, so the costs of the scheme are shared fairly among suppliers²⁷.

The same principle applies to debt costs that built up in the retail market. Ofgem consulted on recovering supplier debt costs through a one-off price cap adjustment of £16, to be paid between April 2024 and March 2025⁷. Because the adjustment runs through the cap, the cost is spread across capped households rather than concentrated on the customers of the suppliers whose practices generated the debt. Alongside the recovery, Ofgem set out proposals to help ensure customers at risk of getting into debt are better supported, including making it easier for consumers to see how good suppliers' customer service is by publishing information on their Citizens Advice star rating⁷.

For households, this section explains a quiet feature of energy bills: some of what a bill contains is not the household's own energy cost but a share of costs the system as a whole has taken on. The £16 adjustment is one visible example⁷. The counterweight is that cost-sharing prevents any one group of customers from being left carrying a failed supplier's debts alone, which is what the supplier of last resort process and its funding arrangements are built to avoid.

Enforcement through penalties, directions and licence changes

Rules without consequences are not rules, and the licence gives the Authority a range of responses when a supplier falls short:

New guaranteed standards were introduced by Ofgem as part of its work to improve customer experience when switching supplier²⁸, and more detail is on our page on switching compensation and guaranteed standards.

The same enforcement logic runs through the environmental schemes. On the Feed-in Tariffs scheme, Ofgem states that it takes compliance with scheme rules extremely seriously and investigates matters where there are concerns with supplier performance or generator compliance, taking action where necessary²⁷. The range of tools, from recorded non-compliance through enforcement action to compensation, is what gives the licence conditions their teeth.

Referral and determination of disputes by the Authority

Individual disputes between a household and a supplier do not go straight to the regulator. The Energy Ombudsman is the approved body: it deals with consumer complaints about energy bills, mis-selling, problems with energy supply and problems with switching supplier³². The Ombudsman's approach to redress is calibrated against the regulator's own payments, so that regulator-set payments such as Ofgem's guaranteed service standards payments are normally considered fair recognition, with awards above them only in exceptional cases²⁹.

The scope of dispute resolution is widening with the market. The Energy Ombudsman can consider disputes where the consumer became aware of the problem on or after 8 December 2025 and the flexibility service provider was a member of the Flex Assure Domestic and Microbusiness Scheme at that time³³. As households take up batteries, smart charging and other flexibility services, dispute routes are following them.

Where the Authority itself determines matters, its decisions are final within its processes. Under the proposed Debt Relief Scheme, the final decision on all claims rests solely with Ofgem, though suppliers may meet Ofgem and submit further evidence for reconsideration⁸. The claims process closely aligns with the Supplier of Last Resort levy claims framework, with suppliers submitting claims to Ofgem and presenting validated claims to network operators for payment⁸. On ECO4, Ofgem has committed to notifying all suppliers of its final determination no later than 30 June 2027³⁰. For a householder, the division of labour is the key point: complain to the supplier, then the Energy Ombudsman, while Ofgem's determinations govern suppliers and schemes rather than individual bills.

Assessing a supplier's financial stability

No single public number tells a household whether its supplier is sound, but the rules create a trail of evidence that can be read. The starting point is the regulator's own monitoring: Ofgem monitors energy suppliers and network operators closely to make sure they meet the rules set out in licences, regulations and law, provide good customer service, and reply quickly to customers who contact them¹⁸. A supplier's record against those rules is more informative than any marketing claim.

Customer service ratings are one visible signal. Ofgem has worked to make it easier for consumers to see how good suppliers' customer service is by publishing information on their Citizens Advice star rating⁷, and our page on energy supplier customer service ratings sets out what the data shows. Complaints are another: a household can contact its supplier about late, incorrect or missing bills, back billing, being overcharged, a faulty meter, poor customer service, or a refusal to refund credit from an account³¹, and how the supplier handles those issues is itself evidence of its operational health.

The regulator's own expectations are a further signal. On the Feed-in Tariffs scheme, Ofgem has said it will continue to have strong expectations of suppliers and accredited generators and will be carefully monitoring their performance throughout the upcoming years²⁷. Persistent non-compliance ends up on the Supplier Performance Report⁸. None of this amounts to a guarantee, and a household cannot see a supplier's stress test results. What the framework offers is a regulator watching the finances continuously, and a market in which a failure, if it comes, is managed rather than chaotic, as our page on what happens if a supplier goes bust explains.

The rules' impact on household energy independence

The financial resilience rules protect a household's supply, but they do not make a household independent. The rules exist precisely because a household that buys gas and electricity from a licensed supplier is dependent on that supplier's solvency, on the wholesale market behind it, and on the regulator's ability to catch failure early. Stress tests, licence conditions and enforcement reduce the chance of disruption; they cannot remove the dependence itself¹.

Some of what the framework funds does push toward independence. The Energy Company Obligation funds domestic energy efficiency measures, and local authorities can set their own criteria for eligibility for that funding¹². Leeds, for example, sets ECO Flex eligibility criteria following guidelines set by Ofgem and the Department for Business, Energy and Industrial Strategy³⁴. A better-insulated home needs less energy whoever supplies it, which is the most durable form of protection a household can hold.

The honest summary is a division of labour. The regulator and the licence conditions carry the risk of supplier failure; the household carries the risk of price levels, because the cap is a ceiling that moves every three months²⁴. A household that wants less exposure to the retail market can reduce what it buys from it, through efficiency measures and, where a home suits it, self-generation, topics covered on our page about energy suppliers and household energy independence. The rules on this page are the safety net under that journey, not the journey itself.