A whole year of electricity rebilled at once: how far can they go
Last updated 2026-09-01 · Reviewed by Jaime Piñeira Pardo, registered with the ICAM bar, no. 138826
The short answer
A retroactive rebilling does not stand on its own: whoever issues it must establish the metering error, since when it existed and how each kilowatt was calculated. You may ask the competent Administration to verify the meter, pay only the undisputed part and challenge the rest. To recover what has already been charged there are five years.
Your electricity bill has run at around sixty euros a month for years. In March a settlement for 1,480 euros arrives, headed as an adjustment for a metering error and covering a period of fourteen months backwards. Nobody warned you beforehand, you have not moved house or changed your habits, and your apparent consumption had gone down. The supplier refers you to the network operator, the network operator refers you back to the supplier, and the bill itself warns that if it is not paid within twenty days there will be a surcharge and supply may be suspended.
The case, in five lines
- What is brought
- A challenge to the rebilling for failure to establish the metering error and its temporal reach, together with a request to verify the equipment and a claim for repayment of whatever was overcharged.
- Before which court
- The energy authority of your autonomous region, which is also the body that verifies the metering equipment, and the Civil section of the Tribunal de Instancia (the first-instance court) to recover what was charged.
- Deadline
- The urgent part is to act before the bill falls due, to avoid the surcharge, and before the meter is removed, because the evidence goes with it. The civil claim for what was charged has five years from payment, under Article 1964.2 of the Civil Code.
- Who can bring it
- The holder of the supply contract. Article 96 of Royal Decree 1955/2000 also recognises the consumer's right, and not only the companies', to request the equipment to be checked.
- Financial risk
- If verification confirms the error and the calculation turns out correct, the sum will have to be paid with whatever surcharge applies. Refusing to pay without a written record that the debt is disputed adds the risk of supply being suspended.
Whoever rebills must prove the error and since when
A retroactive adjustment is a money claim like any other, only issued in the form of a bill. Whoever makes it is asserting three things: that there was a metering error, that the error began on a given date and that actual consumption throughout that period was what is now attributed to you. All three have to be supported with documents, not with a line printed on the invoice.
That is why the first letter does not argue about the figure, it dismantles it. We ask for the record or report identifying the anomaly with its date, the readings taken before and after, the criterion used to estimate consumption for the period, and the justification for going back to that particular month and no other. Whatever is not produced when asked will hardly be produced later.
That exercise is often enough to reduce the figure or to make it disappear. It is common for the start date of the supposed error to have been fixed for administrative convenience, for the estimate to rest on an average consumption that does not match the property, or for the period claimed to exceed what the sector rules allow to be recovered.
You are the one who can ask for the meter to be verified
Article 96 of Royal Decree 1955/2000 recognises the right to ask the competent authority for the place where the installation is located to check and verify the meters, the power control switches and any other devices used as a basis for billing. That right belongs both to distribution and supply companies and the system operator, and to consumers themselves.
The provision adds a decisive detail: the right exists whoever owns the device. That disposes of the usual answer that the meter belongs to the network operator and that only it may examine it. The body that verifies is not the company issuing the bill, it is the Administration, and that is the difference between an internal check and usable evidence.
The request must be made as soon as possible and always before the meter is removed or replaced. Equipment taken down and carried off to the company's store is no longer any use for verifying anything, and the argument then becomes a comparison of estimates. If a replacement has already happened, the record and the whereabouts of the old device are requested at once.
The time limit is checked against the rule in force that day
The electricity sector rules limit how far back a rebilling for a metering error may reach and require the amount to be spread rather than demanded in one go. That limit and that spreading are the backbone of the matter, and that is why the first thing established is which wording was in force on the date the adjustment now claimed from you was made.
The caution is not theoretical. Article 96 of Royal Decree 1955/2000 has itself changed: its second paragraph was repealed by Royal Decree 88/2026 of 11 February. Measuring the bill against a wording no longer in force, or against one that was not yet in force when it was issued, is the quickest way to lose a matter that was there to be won.
Out of that comparison comes the specific request: that the rebilling be cut back to the period the rule allows to be recovered and that the remaining amount be spread as the rule requires. It is a modest looking claim and a devastating one in practice, because it usually leaves the debt at a fraction of what appeared on the bill.
Your legitimate economic interests are not an empty phrase
Article 19 of the consolidated Consumer Protection Act requires the legitimate economic and social interests of consumers to be respected on the terms of that Act, applying in addition the civil and commercial rules, the national sector regulations and any EU and regional rules that apply. It is the bridge between electricity regulation and consumer protection.
The same article expressly contemplates that in the energy field legal or regulatory rules may be laid down offering greater protection to the consumer or user. That matters where your autonomous region has issued its own rules on billing or on suspension of supply: they do not displace the general protection, they add to it.
And it contains a little known tool for the repayment stage. Where the trader does not contribute to a consensual solution of a dispute based on a clause of identical meaning to one already declared void as unfair by the case law of the Tribunal Supremo or by the Court of Justice of the European Union, the court ordering restitution imposes of its own motion interest equal to the statutory rate increased by fifty per cent.
You pay what is undisputed and dispute the rest in writing
The rebilling invoice usually mixes ordinary consumption for the period with the retroactive adjustment. Separating them is the first thing done, because it allows the current part, which nobody disputes, to be paid without reservation and only the contested part to be left unpaid, with a written record of why. That separation defuses much of the risk of supply being cut off.
The letter is addressed to the supplier and to the network operator at once, because the matter is played out between the two and mutual referral is the usual obstacle. It announces the verification request, asks for collection of the disputed part to be held, and warns that any surcharge or reporting of the debt to a default register is being done over a sum that is not undisputed.
If the charge goes through despite everything, the route is not closed. The sum wrongly collected is claimed afterwards, and it is worth knowing that personal actions with no special period are time barred five years after performance could be demanded, under Article 1964.2 of the Civil Code. Paying under documented protest is not the same as accepting the debt.
Recovering what was charged is decided in the Tribunal de Instancia
When the administrative route does not return the money, the claim is brought before the Civil section of the Tribunal de Instancia. Article 250 of the Ley de Enjuiciamiento Civil (the Spanish civil litigation statute) provides in its second paragraph that claims not exceeding fifteen thousand euros, and not concerning the matters reserved to the ordinary route, are decided in the juicio verbal, which covers virtually all of these rebillings.
Before suing, negotiation must have taken place. Article 5 of Organic Law 1/2025 makes prior recourse to an appropriate dispute resolution mechanism a condition of admissibility, and requires identity between the subject of the negotiation and that of the litigation. The reasoned demand addressed to both companies serves that purpose if it was drafted with it in mind.
The claim seeks repayment of the excess charged, together with interest and costs, and produces the result of the administrative verification alongside the consumption history for earlier years. Where the supply contract also contains clauses shifting disproportionate consequences onto the consumer, those clauses are challenged as unfair under Article 87 of the consolidated Consumer Protection Act.
How we run the case, step by step
- 1
Freezing the situation in writing
We notify the supplier and the network operator that the rebilling is disputed, pay the undisputed current part and ask that no debit be made and no surcharge applied to the rest.
- 2
Demanding the full breakdown of the adjustment
We ask for the record identifying the anomaly with its date, the readings before and after, the estimating criterion and the reason why the period goes back to that particular month and not another.
- 3
Request to verify the metering equipment
We ask the competent regional authority to check the meter under Article 96 of Royal Decree 1955/2000, and demand that the equipment not be removed while the request is pending.
- 4
Challenge before the regional energy authority
The matter is put to the competent Administration, asking that the rebilling be confined to the period the rules allow to be recovered and that the remaining amount be spread as those rules require.
- 5
Documented prior negotiation
The requirement of Article 5 of Organic Law 1/2025 is met with a reasoned and quantified demand, ensuring that what is negotiated matches what is later claimed before the court.
- 6
Civil claim for repayment
If the money has already left your account, repayment is claimed before the Civil section of the Tribunal de Instancia, with the verification result and the consumption history as the central evidence.
The evidence that decides the case
- The complete rebilling invoice, with the period adjusted, the readings used and the breakdown of the calculation.
- The consumption and amount history for previous years, which shows whether the figure claimed is consistent with the property.
- The record or report identifying the metering anomaly, with its date, and the meter replacement file if there was one.
- The outcome of the verification carried out by the competent regional authority.
- The supply contract with the contracted power and the conditions applicable to the adjusted period.
- The exchanges between you, the supplier and the network operator, including their referrals of you to each other.
What closes the door
- Paying the whole rebilling to avoid disconnection and claiming afterwards. It can be recovered, but from then on the company holds the money and you are the one who has to sue.
- Letting the meter be removed and replaced without having requested verification. Once the device is taken down, the only objective evidence of the alleged error disappears.
- Refusing to pay the whole bill, including the ordinary consumption part that nobody disputes, and being exposed to disconnection over a sum that was in fact owed.
- Arguing only by telephone with customer service and putting neither the date nor the reason for the objection in writing.
- Switching supplier in the belief that the debt stays behind. The adjustment goes on being claimed and can end up on a default register.
The law that applies
- Art. 96 RD 1955/2000. It recognises the right of distribution companies, suppliers, the system operator and also consumers to ask the competent authority for the place where the installation is located to check and verify meters, power control switches and any other devices used as a basis for billing, whoever owns them. Its second paragraph was repealed by Royal Decree 88/2026 of 11 February. BOE-A-2000-24019
- Art. 19 TRLGDCU. It requires the legitimate economic and social interests of consumers to be respected, applying in addition the civil and commercial rules, national sector regulations and EU and regional rules. It contemplates rules of greater protection in the energy field. And it requires a court ordering restitution to impose of its own motion, where the trader did not contribute to a consensual solution over a clause of identical meaning to one already declared unfair, the statutory interest rate increased by fifty per cent. BOE-A-2007-20555
- Art. 87 TRLGDCU. It declares unfair those clauses that break the reciprocity of the contract to the consumer's detriment, among them imposing obligations on the consumer even where the trader has not met its own, charging for services not actually supplied, and setting compensation that does not correspond to the loss actually caused. BOE-A-2007-20555
- Art. 1964.2 CC. Personal actions with no special period are time barred five years after performance of the obligation may be demanded, and in continuing obligations to do or not to do, time starts afresh on each breach. BOE-A-1889-4763
- Art. 250.2 LEC. Claims not exceeding fifteen thousand euros are decided in the juicio verbal, provided they do not concern any of the matters the article itself reserves for that route regardless of value, nor those of the preceding article. BOE-A-2000-323
- Art. 5 LO 1/2025. It requires prior recourse to an appropriate dispute resolution mechanism as a condition of admissibility in civil matters, with identity between what is negotiated and what is litigated. It is met by mediation, conciliation, a neutral expert opinion, a confidential binding offer or direct negotiation between the parties or their lawyers, and is not required for prior interim measures or preliminary enquiries. BOE-A-2025-76
Each article checked against the consolidated text published in the BOE (the Spanish official gazette).
Frequently asked questions
Can they cut off my power while I dispute the rebilling?
The risk drops sharply if the bill is split in two: the ordinary consumption, which nobody disputes, is paid without reservation, and only the adjustment is left unpaid, notifying the supplier and the network operator in writing that the sum is contested and why. A disputed and documented debt is not the same as a default, and that difference is what is relied on.
The network operator says the meter is theirs and I cannot touch it
Nobody is proposing to touch it. Article 96 of Royal Decree 1955/2000 gives consumers the right to ask the competent authority to check and verify meters and other devices used as a basis for billing, and it does so whoever owns them. The body examining the equipment is the Administration, precisely so that the outcome does not depend on the company issuing the bill.
I already paid the whole bill. Can I get the money back?
Yes, if the rebilling was unjustified or reached beyond the recoverable period. Paying is not the same as acknowledging the debt, especially where it was done under written protest. The claim for the excess charged is a personal action, so it has the five years of Article 1964.2 of the Civil Code from when it could be demanded. The sooner verification is requested, the stronger the claim.
They tell me the amount cannot be spread. Is that true?
Sector rules do not leave the spreading of the amount to the company's discretion where the adjustment stems from a metering error, and the same goes for the maximum period that may be recovered. That is why the matter is approached by establishing which wording was in force on the day your bill was issued, since these rules have changed recently, and then demanding that it be applied as written.
Who do I take this up with, the supplier or the network operator?
With both at once, and from the very first letter. The supplier is the one billing you and the one you have a contract with, but the metering and the meter itself depend on the network operator. Writing to only one lets each refer you to the other, which is exactly what has been happening. Verification, by contrast, is requested by you from the Administration and depends on neither of them.
This guide explains how the action works in general. It does not replace the study of your own case: deadlines depend on when things happened and on what you have done since.