Complaint to the electricity, gas or water company (Spain)
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For the holder of an electricity, gas or water contract in Spain who disputes a bill, a meter reading, a disconnection, a price rise or the service received. The letter files the complaint in writing with the company's customer service, asks for its reference number and a written answer, and makes the attempt to negotiate that Spanish Organic Law 1/2025 requires before suing. Send it by burofax with certified content; you can also send it through the company's complaints channel. In Spanish.
- Made for use in Spain
- Last updated October 20, 2026
Published byDocMuse
When to use this document
- Your electricity bill in Spain is far higher than what you actually used.
- The gas company is charging readings that do not match your meter.
- Your water or electricity was cut off even though you had paid the bills.
- You want to dispute a bill in writing with your electricity, gas or water company.
What you fill in
The details the document asks for.
- Customer
- Customer's address
- Sender's DNI or NIE (Spanish identity number)
- Supplier company (electricity, gas or water)
- Company's postal address (from the contract, invoice or legal notice on its website)
- City
- Date
- CUPS code or supply contract number
- Supply (electricity, gas or water)
- Address of the supply point
- Invoice number
- What the complaint is about
- Requested outcome
Common questions
- How long does an electricity company in Spain have to answer a complaint, and where do I go next?
- Since Royal Decree 88/2026, electricity suppliers must answer complaints within 15 days at most and keep a record of each. Spanish Law 10/2025 sets, for electricity, gas and water companies, a maximum of fifteen working days unless a sector rule says otherwise, enforceable when their adaptation period ends on 28 December 2026. If they do not answer or you disagree, you can go free of charge to the consumer office (OMIC) or your region's consumer service, or to the Consumer Arbitration Board if the company accepts arbitration. Water depends on the town hall and its regulations.
- How do I send the complaint to a utility company in Spain so that there is proof?
- Use the complaints channel shown on your bill or contract and ask for the complaint's reference number; in addition, send this letter by burofax with certified content to the company's postal address. The burofax proves what was sent and when, and makes the attempt to negotiate that Spanish Organic Law 1/2025 requires before suing: the company has thirty calendar days to answer. Keep the bills, the meter readings and dated photos of the meter.
- Are there free models in Spain for complaining to an electricity company, and what if I was switched without permission?
- Yes: the Spanish associations OCU and FACUA publish free model letters for complaints to utility companies, and the CNMC, Spain's energy regulator, explains on its website how to file a complaint. At the company's offices you can ask for your region's complaint sheet (hoja de reclamaciones). If the complaint is that you were signed up or switched to a company without your consent, use this catalogue's letter on contracts nobody asked for, which asks for the contract to be cancelled and a return to the previous company.
How you can sign this document
- Print it and sign by hand. The signature lines in the document are left blank on purpose — sign on them in ink.
- Sign it yourself with a qualified electronic signature. If you already hold a QES — Evrotrust, B-Trust, StampIT, ZealiD or any qualified provider on the EU Trusted List, on a card, a USB token, in a mobile app or in the cloud — our signing guide explains step by step how to sign this exact file without invalidating it. Step-by-step help, and a way to check it worked
DocMuse sells documents, not legal advice. Acceptance always depends on the recipient's rules and your local law.
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