A deadlock letter is a written notice from a business energy supplier, broker or network operator confirming that it cannot resolve a complaint with the customer. It is sometimes called a “final response”, “final decision letter” or “letter of deadlock”.
For a business, receiving a deadlock letter is important because it usually means the complaint can be taken to the Energy Ombudsman without waiting for the full eight-week complaint period to expire.
In simple terms, a deadlock letter means: “We have reached the end of our complaints process and we do not believe we can agree a solution with you.”
This can apply to many types of business energy dispute, including incorrect bills, contract problems, estimated meter readings, disputed standing charges, broker commission complaints, poor customer service, problems switching supplier, or disagreements about whether a business has been placed on the wrong tariff.
What does a deadlock letter mean?
A deadlock letter means that the energy company has reviewed the complaint and reached its final position. It does not necessarily mean the supplier or broker accepts that it has done something wrong. It simply means that, from its point of view, the complaint cannot be resolved through its own internal complaints process.
For the customer, this is useful because it creates a clear route to independent dispute resolution. Instead of continuing to argue with the same supplier or broker, the business may be able to escalate the matter to the Energy Ombudsman.
A deadlock letter should usually explain:
| What the letter should include | Why it matters |
|---|---|
| The supplier or broker’s final position | Shows what the company has decided and why |
| A summary of the complaint | Helps confirm that the business’s issue has been understood |
| Any offer already made | Makes clear whether compensation, a bill adjustment or goodwill gesture is still available |
| The customer’s right to go to the Energy Ombudsman | Explains the next stage of the complaints process |
| Ombudsman contact details | Makes it easier to escalate the complaint |
| Any time limit for escalation | Helps the business avoid missing the deadline |
A deadlock letter can be sent by post or email. The wording does not always have to include the exact word “deadlock”, but it should clearly say that the company has reached its final position or cannot do anything further to resolve the complaint.
When can a business ask for a deadlock letter?
A business can ask for a deadlock letter if it has already made a formal complaint and the supplier, broker or network operator has not resolved the issue.
In practice, there are two main routes to the Energy Ombudsman:
| Situation | What it means |
|---|---|
| Eight weeks have passed since the complaint was raised | The business can usually escalate the complaint even without a deadlock letter |
| A deadlock letter has been issued before eight weeks | The business can usually escalate sooner, because the company has given its final response |
This means a deadlock letter can speed up the complaints process. A business does not normally need to wait for eight weeks if the supplier has already confirmed that it cannot resolve the issue.
However, a business should not usually ask for a deadlock letter before it has clearly explained the complaint and given the supplier or broker a reasonable chance to respond. A weak or rushed complaint can make the case harder to prove later.
Example of a business energy deadlock situation
A small shop receives a business electricity bill that is much higher than expected. The business believes the bill is wrong because it is based on estimated meter readings and includes a standing charge that does not match the contract.
The business contacts the supplier and makes a complaint. It sends meter readings, copies of previous bills and a copy of the contract. The supplier reviews the account but says the bill is correct. The business disagrees and asks for the complaint to be reviewed.
After further correspondence, the supplier says it will not change the bill. At this point, the supplier may issue a deadlock letter confirming that it has reached its final position.
The business can then take the complaint to the Energy Ombudsman, providing the deadlock letter, bills, meter readings, contract documents and copies of correspondence.
What types of business energy complaints can lead to a deadlock letter?
Deadlock letters can arise from many commercial energy disputes. Common examples include:
| Complaint type | Example issue |
|---|---|
| Incorrect billing | The business is billed for the wrong meter, wrong dates, wrong rates or wrong usage |
| Estimated readings | Bills are based on estimates despite actual meter readings being provided |
| Contract disputes | The business says it did not agree to a contract, renewal or tariff |
| Broker complaints | The business believes commission, fees or contract terms were not properly explained |
| Deemed or out-of-contract rates | The business is placed on higher rates after a contract ends or after moving premises |
| Switching problems | A transfer to a new supplier is delayed, blocked or completed incorrectly |
| Metering problems | The meter details, MPAN, MPRN, smart meter data or opening readings are wrong |
| Customer service failures | The supplier repeatedly fails to respond, loses information or gives conflicting answers |
| Disconnection or supply issues | The business disputes action taken on debt, payment or supply interruption |
| Refund or credit disputes | The supplier refuses to return credit after an account closes |
A deadlock letter is not limited to billing complaints. It can apply whenever the business and the energy company cannot agree a resolution.
Is a deadlock letter the same as an eight-week letter?
A deadlock letter and an eight-week letter are related, but they are not exactly the same.
| Letter type | Meaning |
|---|---|
| Deadlock letter | The company says it cannot resolve the complaint and has reached its final position |
| Eight-week letter | Eight weeks have passed since the complaint was raised, so the customer may now be able to escalate |
| Final response letter | Another term often used for a deadlock letter or final decision |
The practical result can be similar: the business may be able to take the complaint to the Energy Ombudsman. The difference is that a deadlock letter can be issued before eight weeks if the supplier or broker has already reached its final position.
Who can use the Energy Ombudsman for business energy complaints?
The Energy Ombudsman can usually consider complaints from domestic customers, microbusinesses and eligible small businesses. For business energy, this is particularly important because larger commercial customers may not always have the same route to Ombudsman support.
A small business may be eligible if it meets the relevant criteria, such as employee numbers, turnover, balance sheet size or energy consumption thresholds. The rules can be technical, so businesses should check eligibility before relying on Ombudsman support.
For many small organisations, the Ombudsman route is valuable because it gives access to free, independent dispute resolution without immediately needing to go to court.
Examples of businesses and organisations that may be eligible include:
| Business or organisation type | Possible example |
|---|---|
| Small retailer | Convenience store, boutique, newsagent or local shop |
| Hospitality business | Café, pub, takeaway, restaurant or hotel |
| Professional services firm | Accountant, solicitor, design studio or consultant |
| Healthcare or care provider | Dental practice, GP practice, veterinary practice or care home |
| Community organisation | Charity, faith group, club or local association |
| Light industrial business | Small workshop, bakery, garage or manufacturer |
Eligibility depends on the Ombudsman’s criteria, not simply on whether the customer has a business energy contract.
What should a business do before requesting a deadlock letter?
Before asking for a deadlock letter, a business should make sure it has made a clear formal complaint. This helps show that the supplier or broker has been given a proper opportunity to resolve the problem.
A good complaint should include:
| Information to include | Example |
|---|---|
| Business name and account number | The name on the energy account and customer reference |
| Supply address | The premises affected by the complaint |
| Meter details | MPAN for electricity, MPRN for gas, meter serial number if relevant |
| Contract details | Tariff, start date, end date, standing charge and unit rate |
| What went wrong | Incorrect bill, disputed rate, broker issue, switching problem or meter problem |
| What outcome is requested | Corrected bill, refund, apology, compensation, contract cancellation or written explanation |
| Supporting evidence | Bills, contracts, emails, meter photos, call notes and payment records |
A business should keep a record of when the complaint was first raised. This date matters because the eight-week period normally starts from the point the complaint was made.
How to request a deadlock letter
A business can request a deadlock letter in writing. Email is usually best because it creates a dated record.
A simple request might say:
“I am asking you to treat this as a formal complaint. If you are unable to resolve the matter, please issue a deadlock letter or final response so that I can refer the complaint to the Energy Ombudsman.”
The request should be polite, factual and specific. Avoid making the complaint overly emotional. The aim is to show that the business has explained the problem clearly and has given the supplier or broker a fair chance to resolve it.
Template wording for requesting a deadlock letter
Subject: Formal complaint – request for deadlock letter if unresolved
Dear [Supplier/Broker name],
I am writing about the complaint on our business energy account: [account number], for [supply address].
The complaint relates to [briefly explain the issue, such as incorrect billing, disputed rates, meter readings, contract renewal, broker commission or switching problem].
I first raised this issue on [date]. Despite previous contact, the matter has not been resolved.
Please review the complaint and confirm your final position in writing. If you are unable to resolve the complaint, please issue a deadlock letter or final response so that I can refer the matter to the Energy Ombudsman.
The outcome I am seeking is [explain what you want, such as corrected bills, a refund, removal of incorrect charges, contract cancellation, compensation or a written explanation].
I have attached the following supporting evidence:
- [Bill or statement]
- [Contract or renewal document]
- [Meter reading/photo]
- [Email correspondence]
- [Payment evidence]
Please confirm receipt of this complaint and provide a complaint reference number.
Yours faithfully,
[Name]
[Business name]
[Contact details]
What happens after a deadlock letter is issued?
Once a business receives a deadlock letter, it should read it carefully and decide whether to accept the company’s final offer or escalate the complaint.
The next steps are usually:
| Step | Action |
|---|---|
| 1 | Read the deadlock letter and check the supplier’s final position |
| 2 | Review whether any offer is still available |
| 3 | Gather evidence, including bills, contracts and correspondence |
| 4 | Check whether the business is eligible to use the Energy Ombudsman |
| 5 | Submit the complaint to the Ombudsman within the deadline |
| 6 | Respond promptly to requests for more evidence |
| 7 | Review the Ombudsman’s decision when issued |
The Energy Ombudsman will usually look at both sides of the dispute and decide what is fair based on the evidence, relevant rules, the contract and good industry practice.
What evidence should a business provide?
Evidence is often the deciding factor in a business energy dispute. A strong complaint is usually supported by clear documents, dates and figures.
Useful evidence can include:
| Evidence | Why it helps |
|---|---|
| Energy bills | Shows rates, standing charges, consumption and disputed amounts |
| Contract documents | Confirms agreed prices, dates and terms |
| Renewal notices | Helps with automatic renewal or rollover disputes |
| Meter readings | Shows whether bills were estimated or based on actual use |
| Photos of meters | Supports meter reading accuracy |
| Emails and letters | Shows what was said and when |
| Call notes | Useful when key conversations happened by phone |
| Broker correspondence | Helps with mis-selling or commission complaints |
| Payment records | Shows what has been paid, withheld or refunded |
| Site move documents | Useful if the dispute relates to moving premises |
| Previous supplier bills | Helps prove opening or closing readings |
Businesses should organise evidence chronologically. A short timeline can make a complaint much easier for the Ombudsman to understand.
Can a supplier refuse to issue a deadlock letter?
A supplier or broker may refuse to issue a deadlock letter if it believes the complaint is still being investigated or if it thinks there are further steps it can take.
This does not necessarily prevent escalation. If eight weeks have passed since the formal complaint was raised and the complaint is still unresolved, the business may usually be able to go to the Energy Ombudsman without a deadlock letter.
If the supplier has not issued a deadlock letter and eight weeks have not passed, the business may need to continue with the supplier’s complaints process until either:
- the complaint is resolved;
- the supplier issues a final response or deadlock letter; or
- eight weeks have passed.
Does a deadlock letter mean the business will win?
No. A deadlock letter does not mean the supplier or broker is at fault. It only means the complaint can move to the next stage.
The Ombudsman will still consider the evidence from both sides. The final outcome could be:
| Possible outcome | What it could mean |
|---|---|
| Complaint upheld | The Ombudsman agrees there was a problem |
| Complaint partly upheld | Some parts of the complaint are accepted |
| Complaint not upheld | The Ombudsman does not agree that the supplier or broker acted wrongly |
| Practical remedy | The company must correct an account, amend a bill or take specific action |
| Apology or explanation | The company must explain what happened or apologise |
| Financial award | Compensation or a payment may be awarded, where appropriate |
The Ombudsman is not there to punish energy companies. Its role is to resolve disputes fairly.
Can a business still accept an offer after a deadlock letter?
Sometimes a supplier will make a final offer in the deadlock letter. The letter should explain whether that offer remains open if the customer goes to the Ombudsman.
This is important. In some cases, a supplier may withdraw a goodwill offer once the complaint is escalated, so that the Ombudsman can assess the case independently. In other cases, the offer may remain open for a limited time.
Before escalating, the business should check:
| Question | Why it matters |
|---|---|
| Is there a financial offer? | It may be worth comparing this with the likely outcome of escalation |
| Is the offer time-limited? | The business may need to act quickly |
| Will the offer be withdrawn if the case goes to the Ombudsman? | Escalating could mean losing the current offer |
| Does accepting the offer close the complaint? | Acceptance may prevent further escalation |
| Does the offer fix the underlying issue? | A small goodwill payment may not correct future billing problems |
A business should not accept an offer unless it understands whether the complaint will be considered fully settled.
Deadlock letters and energy brokers
Deadlock letters can also be relevant to complaints about energy brokers or third-party intermediaries. Broker complaints have become more common, particularly where businesses believe they were misled about contract terms, commission, prices or renewal arrangements.
Examples of broker-related complaints include:
| Broker complaint | Example |
|---|---|
| Hidden commission | The business says commission was not properly disclosed |
| Misleading savings claims | The broker promised savings that did not materialise |
| Contract mis-selling | The business says it did not understand or authorise the contract |
| Pressure selling | The business says it was rushed into agreeing a deal |
| Incorrect contract details | Wrong business name, supply address, term or rates |
| Poor renewal advice | The broker failed to explain better options before renewal |
Where a broker complaint cannot be resolved, the broker may issue a final response or deadlock letter. The business may then be able to escalate to the relevant dispute resolution scheme, depending on the broker, the complaint and eligibility rules.
How long does a business have to escalate after a deadlock letter?
A business should act promptly after receiving a deadlock letter. The Energy Ombudsman generally expects complaints to be escalated within the relevant time limit stated in the letter.
This is another reason to read the letter carefully. Do not file it away and assume the complaint can be raised at any time in the future. Missing the escalation deadline could make it harder or impossible to use the Ombudsman route.
What if the business is too large for the Ombudsman?
Not every business energy customer will be eligible to use the Energy Ombudsman. Larger businesses may need to rely on other routes, such as further negotiation, legal advice, mediation, a trade body scheme, or court action.
Even where a business is too large for the standard Ombudsman route, it is still worth asking the supplier or broker to confirm its final position in writing. A clear final response can still be useful evidence if the dispute later moves to another forum.
How to improve the chances of a successful complaint
A business energy complaint is more likely to succeed if it is clear, evidence-based and realistic. The Ombudsman will not simply accept the customer’s version of events without proof.
Practical tips include:
| Tip | Why it helps |
|---|---|
| Keep the complaint focused | Avoid mixing several unrelated issues unless they are connected |
| Use dates and figures | Specific details are more persuasive than general frustration |
| Provide documents | Bills, contracts and emails carry more weight than memory alone |
| Explain the financial impact | Show how much the issue has cost the business |
| State the desired outcome | Make clear whether you want a refund, correction, apology or compensation |
| Keep copies of everything | Evidence may be needed weeks or months later |
| Respond quickly | Delays can slow down the Ombudsman process |
| Be realistic | The remedy should match the problem |
For example, instead of saying “the bill is ridiculous”, a stronger complaint would say:
“The bill dated 14 March charges 34.8p per kWh, but our signed contract dated 5 January shows an agreed rate of 27.2p per kWh. Based on 8,000 kWh of usage, we believe the account has been overcharged by £608 plus VAT.”
Common mistakes to avoid
Businesses often weaken their own complaints by failing to keep records or by escalating before the issue is clearly explained.
Common mistakes include:
| Mistake | Why it can cause problems |
|---|---|
| Only complaining by phone | There may be no clear written record |
| Not noting the first complaint date | Makes the eight-week deadline harder to prove |
| Sending unclear evidence | The Ombudsman may not understand the issue quickly |
| Ignoring supplier responses | The case may look weaker if the business does not engage |
| Missing the escalation deadline | The Ombudsman may not be able to consider the complaint |
| Accepting a settlement too quickly | The business may unintentionally close the complaint |
| Withholding payment without advice | This can lead to debt, disconnection risk or credit control action |
A business should continue to manage its account carefully while the complaint is ongoing. If part of a bill is disputed, it may still be sensible to pay the undisputed amount and explain in writing which part is being challenged.
Deadlock letter checklist for businesses
Before escalating a business energy complaint, use this checklist:
| Checklist item | Done? |
|---|---|
| Formal complaint submitted to supplier or broker | |
| Complaint reference number obtained | |
| Date of first complaint recorded | |
| Deadlock letter or final response received, if available | |
| Eight weeks checked, if no deadlock letter has been issued | |
| Bills, contracts and meter readings collected | |
| Email and call records saved | |
| Desired outcome written clearly | |
| Eligibility for Ombudsman support checked | |
| Escalation deadline noted |
Summary
A deadlock letter in business energy is a formal written confirmation that a supplier, broker or network operator has reached its final position on a complaint. It matters because it can allow an eligible business to escalate the dispute to the Energy Ombudsman without waiting for the full eight-week complaint period.
For small businesses, a deadlock letter can be a useful step when dealing with unresolved billing problems, contract disputes, broker issues, metering errors or poor service. However, it does not guarantee success. The business still needs to provide clear evidence and explain the outcome it wants.
The best approach is to make a formal complaint in writing, keep a record of all correspondence, request a deadlock letter if the issue cannot be resolved, and escalate promptly if the supplier or broker’s final position is unacceptable.
FAQ
A deadlock letter is a final response from an energy supplier, broker or network operator saying it cannot resolve your complaint. It confirms that the company has reached the end of its complaints process and that you may be able to escalate the dispute to the Energy Ombudsman.
Yes. Businesses can receive deadlock letters for commercial energy complaints. This can include disputes about bills, contracts, broker advice, meter readings, deemed rates, switching delays, customer service or refunds. The letter gives the company’s final position and usually explains the next escalation route.
Not always. If eight weeks have passed since you raised a formal complaint and it has not been resolved, you may usually be able to contact the Energy Ombudsman without a deadlock letter. A deadlock letter is useful because it can allow escalation before eight weeks.
Energy companies normally have eight weeks to resolve a complaint. If they issue a deadlock letter before then, you may be able to escalate sooner. Keep a record of the date you first complained, as this is important when calculating the eight-week period.
A deadlock letter should set out the company’s final position, explain why the complaint has not been resolved, include any final offer, and provide information about the right to contact the Energy Ombudsman. It should also explain any deadline for escalating the complaint.
Yes, but check the wording carefully. Some offers may be withdrawn if you escalate to the Ombudsman, while others may remain open for a set period. Make sure you understand whether accepting the offer will close the complaint before agreeing to anything.
No. A deadlock letter only means the complaint can move to independent review. The Ombudsman will still consider the evidence from both sides. The outcome could be in favour of the business, partly in favour of the business, or in favour of the supplier or broker.
Yes, eligible businesses may be able to complain about an energy broker or third-party intermediary. This could include complaints about hidden commission, mis-selling, misleading contract advice or poor service. The correct escalation route may depend on the broker and dispute resolution scheme.
Useful evidence includes bills, contracts, emails, meter readings, photos of meters, call notes, renewal letters, broker correspondence and payment records. A clear timeline is also helpful. The more specific your evidence, the easier it is for the complaint to be assessed fairly.
If you miss the deadline stated in the deadlock letter, the Ombudsman may not be able to consider the complaint. Act promptly after receiving a deadlock letter, check the time limit carefully and submit the complaint as soon as your evidence is ready.
