How To

Home Energy How-To: The Full UK Guide to Switching, Meter Readings, EPCs, Grants, Complaints and Power Cuts

Most household energy problems come down to one question: who is actually responsible for this? Your energy supplier sells you gas and electricity and bills you for it. Your network operator owns the pipes and wires that carry the energy to your door, and it is the organisation to contact about a power cut or a connection problem in your area¹. Confusing the two is the single most common reason a complaint or a fault report goes nowhere.

This guide covers the practical tasks every UK household eventually faces: switching supplier, taking and submitting meter readings, getting a smart meter and keeping it working, understanding why bills move even when you never switch, finding grants, getting free advice, complaining properly, escalating to the Energy Ombudsman, dealing with power cuts, and knowing what happens if your supplier goes out of business. Where the process differs between England, Scotland, Wales and Northern Ireland, it says so.

Dividing up the duties

The split of responsibility runs through every task on this page, so it is worth fixing firmly before anything else. Your energy supplier is the company you pay for the gas and electricity you use. It bills you, sets your tariff, arranges your meter where a smart meter is concerned, and handles problems relating to late, incorrect or missing bills, back billing, being overcharged, a faulty meter, poor customer service, or refusing to refund credit from your account².

Your network operator is a different organisation entirely. It is responsible for the pipes and wires that move energy, and it should be contacted about power cuts or connection issues in your area¹. A supplier cannot fix a power cut, and a network operator cannot correct your bill. When a smart meter stops working, responsibility returns to the supplier: the supplier is responsible for maintenance and will fix or replace the meter as needed⁷.

For a household thinking about energy independence, this division matters. The supplier relationship is the part you can change at will, by switching. The network is the part you cannot choose, and it is where a home's dependence on external infrastructure is most visible: no amount of supplier switching will restore supply in a power cut. Our page on who to call for an energy problem lists the numbers for each case.

Changing supplier: what alters, what stays and possible pitfalls

If you pay a supplier directly for the electricity or gas you use at home, you can choose to switch to a different supplier or tariff at any time⁸. The switch changes who bills you and at what price; it does not change the physical supply, the meter on the wall, or the wires and pipes that deliver the energy, which remain the network operator's.

To compare deals properly you need a handful of details to hand⁸:

• your postcode
• the name of your current supplier
• the name of your current tariff
• the amount you pay for your energy per unit in kilowatt hours (kWh)
• the amount of energy you use each year

Without the last two, any quote is guesswork, which is one reason accurate meter readings matter so much, as the next section explains. Our step-by-step guide to switching energy supplier walks through the process from quote to final bill.

Two situations change the picture. If you have a Green Deal loan attached to your home, you can still change electricity supplier, but only as long as the new supplier is taking part in the Green Deal scheme⁹. And if you have your own contract with an energy supplier for business rather than domestic use, you may be able to switch your business energy supplier under separate rules¹⁰. Renters can usually switch too, subject to the terms of their tenancy, which our page on switching supplier if you rent sets out.

What can go wrong is mostly timing and metering. A switch that overlaps with an estimated bill can leave you chasing a refund from the old supplier, and, as the smart mode section below explains, a smart meter may temporarily stop sending automatic readings when the account moves.

Reading your meter: submitting figures, estimates and why they count

A meter reading is the evidence of how much energy you have actually used. Without one, your supplier estimates your consumption, and estimates drift: too high and you are lending the supplier money through your monthly payments, too low and you are storing up a bill shock when a real reading finally arrives. A smart meter removes most of this by sending your electricity and gas meter readings to your supplier automatically, so you get bills based on accurate meter readings and not estimates¹¹.

Where readings are sent automatically, the frequency can be monthly, weekly, daily, or even half-hourly¹². The more frequent the readings, the closer your monthly payments track your real use, and the less likely you are to build up a large credit or debt on the account. For households on a time-of-use or dual-rate tariff, frequent readings also mean the cheap-rate usage is recorded correctly.

For manual meters, the reading is still the householder's task. In official statistics, electricity meters with a profile class of 1 or 2 are classified as domestic meters¹³, which is the technical distinction behind the difference between a standard domestic meter and one on an Economy 7-type arrangement. If you have never read your meter before, our guides cover how to take a meter reading, reading a gas meter, reading an electricity meter, and converting gas units to kWh.

Submitting the reading to the supplier is a separate step from taking it, and there are right and wrong times to do it: on the day of a switch, on moving day, and at the end of an estimated billing period. Our page on submitting meter readings covers the channels suppliers accept and what to do about moving home. If you suspect the meter itself is at fault, the process for reporting a faulty or inaccurate meter is a formal one, and accuracy here is worth pursuing: a faulty meter can distort every bill that follows.

Smart meters: their role and common problems

A smart meter measures your gas and electricity usage and sends the data directly to your energy supplier⁷. Smart meters also come with an In-Home Display (IHD), a small portable screen that shows your energy use in near real time, so you can see and manage your consumption to save money¹⁴. They are replacing analogue gas and electricity meters as part of the national infrastructure upgrade to improve and modernise Great Britain's energy system¹⁴.

For a household's energy independence, the in-home display is the more transformative of the two. Automatic readings make billing accurate, but the display is what turns energy from an invisible monthly cost into something you can see, compare and act on hour by hour. It is also the entry point to more flexible tariffs, including dual-rate tariffs¹¹, which reward shifting consumption to cheaper periods, a habit that becomes far more valuable if you later add solar panels, a battery or an electric vehicle charger.

What can go wrong falls into two categories¹¹:

• The meter stops recording the energy you use. The usage figures on the display or the meter itself no longer advance.
• The meter no longer sends readings to your supplier. The meter records correctly but the automatic transmission fails.

Either way, the response is the same: contact your supplier, which is responsible for maintenance and will fix or replace the meter as needed⁷. Until it is fixed, you may need to revert to manual readings, and our guide to how to get a reading from a smart meter shows where the buttons and screen readings are. If the in-home display itself goes blank or loses contact with the meter, that is a separate, usually simpler fault, covered in what to do when an in-home display stops working.

Smart mode across a switch: meter stoppages and restarts

The most common smart meter problem is not a fault at all but a side effect of switching. When you move to a new supplier, your meter may not work in smart mode, and you may need to take meter readings manually and submit them to your new supplier instead¹⁵.

This happens because the communications link that carries readings between the meter and the supplier has to be re-pointed at the new company's systems. During that window the meter usually continues to record usage correctly on its own display; what stops is the automatic transmission. The meter has not broken, and the supply has not been affected. The practical consequence is a period of manual readings, so it is worth taking a reading on the day of the switch, which also protects you in any dispute about where one supplier's charges end and the other's begin.

Households planning a switch can simply expect this gap and budget a few minutes a month for manual readings during it. Our page on switching energy supplier notes the reading to take before the transfer completes.

The price cap: bill movements without switching

Many households never switch supplier, yet their bills still rise and fall. The reason is the energy price cap, which sets a ceiling on the rates a supplier can charge on default tariffs, and which is recalculated periodically by Ofgem. When the cap moves, the unit rates and standing charges on your bill move with it, whether or not you have ever done anything at all.

The cap's protection follows the account, not the effort you put in. Even households that have taken no action are covered: if your supplier goes out of business and you are moved to a new supplier's deemed contract, the default arrangement for customers who have not chosen a tariff, you are still covered by the energy price cap¹⁵. This matters because a deemed contract is not a deal you negotiated, and without the cap there would be nothing limiting what could be charged on it.

The cap is a ceiling, not a target price, and it does not prevent bills rising when wholesale costs rise. It also does not cap your total bill, only the unit rates and standing charges, so a household that uses more energy pays more within the cap. This is why usage, not just price, is the lever a household actually controls: every kWh saved is money off the bill under any cap level. The cap is reviewed on a schedule, so a bill can change several times a year with no change of supplier or tariff, which is worth knowing before assuming a supplier has made an error.

Financial support: sources in each UK nation

Grant funding for home energy improvements is fragmented, and what is available depends on where in the UK you live. Energy suppliers themselves run schemes and grants for making energy-saving improvements to your home, and Ofgem's help with energy bills pages are the place to check what is currently on offer¹⁶.

In England, the recent picture is one of closed and continuing schemes. The Green Homes Grant voucher scheme provided grants to homeowners and landlords to make energy efficient improvements to homes, and it ran between September 2020 and March 2021 for domestic properties in England¹⁷. Its successors, the Green Homes Grant Local Authority Delivery (LAD) scheme and the Home Upgrade Grant (HUG), funded measures in domestic properties, with official statistics monitoring the installation of energy efficiency measures under both schemes as of July 2025¹⁷. A consultation on reforming consumer protection for home upgrade schemes describes a new single-entry point for consumer home energy advice on GOV.UK, called Home Energy Advice, intended to help homeowners, landlords and tenants find tailored, impartial and trusted advice on how to heat their homes and make them more energy efficient¹⁸.

In Scotland, funding is channelled through area-based schemes. Energy Efficient Scotland: Area Based Schemes provide home owners and landlords with access to grant funding which meets the Scottish Government's future minimum energy efficiency standards¹⁹. In Northern Ireland, NI Energy Advice offers independent and impartial energy advice to domestic householders, plus referrals to energy grants and other sources of help²⁰.

Free guidance across the nations: Home Energy Scotland, Citizens Advice and the Consumer Council

Every nation has a free, independent advice service for household energy, and using it costs nothing but the phone call.

In Scotland, Home Energy Scotland provides free, independent and impartial energy advice to householders, community groups and businesses throughout Scotland¹⁹, and it is administered by the Energy Saving Trust on behalf of the Scottish Government²¹. You can talk to an advisor by calling 0808 808 2282, with phone lines open Monday to Friday 8am to 8pm, and 9am to 5pm on Saturdays⁵. A separate service, Energyadvice.scot, offers a free service for Scottish citizens who have questions about their energy supplier, want to understand their supplier's complaints process, or have problems with their energy bills, and can be called on 0808 196 8660².

In England and Wales, Citizens Advice operates the consumer service for energy complaints, and it may refer you to the Extra Help Unit if you need support with a difficult or urgent complaint, cannot deal with your energy supplier on your own due to personal circumstances, are considered vulnerable, or are at risk of being disconnected from an energy supply². In Northern Ireland, where the energy market is separate, NI Energy Advice offers independent and impartial energy advice to domestic householders, plus referrals to energy grants and other sources of help²².

These services exist because the energy market is complicated by design, and the advice is genuinely independent rather than sales-led. For a household weighing up insulation, a new heating system or a complaint, a free hour with an adviser who has no product to sell is one of the highest-value resources available. Our page on who to call for an energy problem gathers the numbers in one place.

Raising a complaint with your supplier: the first eight weeks

Every energy complaint starts in the same place: with the supplier or network operator itself. Your energy supplier must try to fix any problems you reported within 8 weeks and resolve the complaint²³. That eight-week window is the foundation of the whole complaints process, because it is only after it expires, or after a deadlock letter, that an independent body will look at the dispute.

Contact your energy supplier if you have a problem relating to²:

• late, incorrect or missing bills
• back billing
• being overcharged
• a faulty meter
• poor customer service
• a refusal to refund credit from your account

If you have your own contract with an energy supplier, you can follow their complaints procedure, and the details should be on your bill or on their website¹⁰. Putting the complaint in writing, and keeping a note of the date it was raised, matters more than it might seem: the date the complaint was raised is one of the pieces of evidence any later escalation will ask for.

The eight weeks is a deadline for the supplier to investigate and resolve the problem, not a licence to wait. A supplier that resolves the complaint in week two has met its obligation. One that goes silent past eight weeks has not, and the consumer's next step opens up. Our page on how to complain about an energy supplier and escalate it covers the practical steps, and what number to call for help with an energy complaint lists the phone routes.

The Energy Ombudsman: escalation rights and the process

If the issue is not resolved to your satisfaction, you can complain to the Energy Ombudsman¹⁴. Two doors open the way there: if after 8 weeks your issue is still unresolved, the Ombudsman can investigate²⁴, or your supplier can send you a deadlock letter, which allows you to come to the Ombudsman sooner than 8 weeks²⁵. A deadlock letter is the supplier's written acceptance that it will not resolve the complaint itself.

Once you escalate, the process is structured. The Energy Ombudsman will ask you to send information and evidence relating to the dispute, review evidence from both you and your energy company, inform you of its decision, and give the energy company a set of actions to resolve the problem²³. On average, most disputes are resolved within 6 weeks of the Ombudsman receiving evidence from both parties³. To start, you search for the name of your energy supplier on the Ombudsman's raise-a-dispute pages²⁶.

The eligibility conditions are consistent across the Ombudsman's own guidance: you must have received a deadlock letter, or it must have been 8 weeks without your complaint being resolved, and you must have sufficient evidence to support your case, including the date you raised the complaint with the company²⁷. The same eight-week rule applies across adjacent schemes: complaints under the Smart Export Guarantee and Green Deal may likewise be referred to the Energy Ombudsman if a satisfactory solution has not been agreed after eight weeks²⁸. Our page on deadlock letters covers that document in detail.

Ombudsman powers: compensation, remedies and restrictions

The Energy Ombudsman is approved by Ofgem, the UK energy regulator, to handle service disputes in the energy sector²⁴. It handles disputes involving suppliers, energy brokers, network operators, Green Deal providers and heat network suppliers⁶, and it can process complaints for both domestic and small business consumers⁴. Only domestic consumers, micro-businesses, and small businesses may apply²⁹.

What it can do is meaningful but bounded. It can tell suppliers to take practical action, such as crediting or cancelling an account or changing your tariff; to make an apology; or to offer a financial award, or a combination of these, and it may make recommendations to prevent issues happening again³. Financial awards are based on the cost of putting things right, such as ensuring you have been charged accurately, clearing unfair charges or fixing faults³. The ceilings are up to £10,000 for domestic energy disputes, or up to £20,000 for small business disputes³, though the average award is around £50⁴.

What it cannot do is equally important. The Ombudsman cannot punish companies, dictate how companies operate, or issue fines³. It does not issue fines or dictate how companies operate; that is the responsibility of the companies' trade body or regulator²⁴. It only handles disputes involving suppliers trading in Britain²⁴, so Northern Ireland consumers use a different route. Its remit also has edges: it can consider complaints relating to Electric Vehicle charging at a consumer's home but is unable to consider complaints about charging away from the home³⁰.

The scheme has been widening. From 1 April 2025, the Energy Ombudsman can help consumers and small businesses resolve heat network disputes⁶, with a free and independent dispute resolution service for heat network consumers³¹, and from 8 January 2026 it can handle disputes for a number of flexibility service providers⁶. Yet the Ombudsman's own review acknowledges an access problem: too many consumers who could use the service either cannot or choose not to, for reasons including being unaware of who the Ombudsman is or being daunted by the process³⁰. Disputes about travel, retail, insurance, employment, financial products or banking belong to other ombudsman schemes, of which there are over 20 in the UK²⁶. Our page on what resolution to expect from the Energy Ombudsman works through the outcomes in practice.

Cuts and network faults: responsibility and contacts

A power cut is not your supplier's problem to solve. A network operator is responsible for the pipes and wires that move energy, and should be contacted about power cuts or connection issues in your area¹. The supplier bills you; the network operator keeps the electricity flowing and the gas pressure up.

Finding out who your network operator is takes one step: you can find out who your network provider is via the Energy Networks Association website²⁵. That matters because most households have never heard of their network operator and have no reason to know its name until the lights go out.

Network problems can also become complaints. The Energy Ombudsman can consider disputes about network operators if there is a loss of service or a problem with a connection or repair²⁵. So the sequence for a persistent network problem is the same as for a billing dispute: complain to the operator, allow eight weeks or obtain a deadlock letter, then escalate. For preparation rather than reaction, our guides on preparing a home for a power cut and preparing for storms and floods cover what to have ready, and reporting a gas emergency covers the situations where the call is urgent rather than administrative.

Supplier failure: your bills, credit balance and ongoing complaints

Suppliers do fail, and when one does the process is more orderly than most households fear. If your supplier goes out of business, your credit balance is still protected by the rules Ofgem sets, and the new supplier will contact you about a refund¹⁵. You do not lose the money you have built up in credit through your monthly payments.

You will be moved to a new supplier, typically on a deemed contract, and you are still covered by the energy price cap on that contract¹⁵. The new supplier will review your current payments and debt repayments¹⁶, so the monthly amount can change, and it is worth checking the new tariff rather than drifting on the deemed one indefinitely. You keep the right to switch away from the new supplier once the account is settled.

Open complaints transfer into this framework too. If you have your own contract with an energy supplier, you can follow their complaints procedure, with details on your bill or their website¹⁰, and the eight-week rules apply to the new supplier once it holds the account. One caution from the Green Deal world shows the risk of leaving things late: a Green Deal complaint about Home Energy and Lifestyle Management Ltd, which has gone out of business, illustrates what happens when the company behind a plan disappears²¹. The Ombudsman can review disputes with Green Deal providers if they are unable or unwilling to help when something goes wrong with a Green Deal plan⁶, but a company that has ceased trading cannot be compelled in the same way a trading one can.

Manufacturer guarantees and signing up: a job with a time limit

When a household buys a boiler or similar installed equipment, the warranty on paper is often longer than the warranty in force, because makers condition the longer terms on registration. Ideal Heating's boiler warranties vary between 2 and 12 years depending on the boiler model, subject to registering within 30 days of purchase³².

That 30-day window is the task with the deadline. A warranty that would have run for a decade can instead run for two years if the registration form is never sent, and the maker's own guidance is the authority on the condition. For a household investing in a heating system as part of moving towards greater energy self-sufficiency, the warranty is the manufacturer's continuing stake in the product, and it is also a continuing dependence: the maker must still exist, and the registration must have been done correctly, for the promise to be worth anything.

The practical steps are simple:

1. Register the product with the maker within the stated window, which for Ideal Heating is 30 days of purchase³².
2. keep the proof of purchase and the registration confirmation.
3. Have the appliance serviced as the warranty requires.

Our page on how often to have a boiler serviced covers the servicing side, and whether DIY boiler repairs invalidate a warranty explains how the conditions can be broken.

Energy performance certificates and how ratings are calculated

An Energy Performance Certificate rates a home's energy efficiency, and it is the document most households meet when buying, selling or letting a property. Behind the familiar A-to-G rating sits a calculation: for new dwellings, the Target Primary Energy Rate, Target Emission Rate and Target Energy Use Intensity must be calculated using the UK Government's Standard Assessment Procedure for energy rating of dwellings, version 10.3, as set out in the 2026 edition of Approved Document L Volume 1³³.

For the householder, the significance is that the rating is a modelled assessment, not a measurement of how the home actually performs with your family in it. Two identical EPC ratings can hide very different bills, because behaviour, heating patterns and the condition of the heating system all sit outside the certificate. The EPC is nonetheless the document that grant schemes, lenders and landlords work from, so errors on it have real consequences, and they can be challenged: our guides cover how to read an EPC, getting an EPC or finding an existing one, challenging a wrong EPC, and who to contact about an EPC problem.

The direction of travel is towards tighter standards, which makes the certificate more than a formality. A home with a poor rating faces rising costs under any pricing regime, and improving it is the foundation of every other step on this page: a well-insulated home needs less energy whatever tariff it is on, and is better placed to benefit from a smart meter, a flexible tariff, or eventually its own generation. For the full picture of taking control of your home's energy, see how to take more control of your home's energy: the practical steps.