The Electrical Certificate (CIE) in Spain: What It Is and How to Get It

If you have ever tried to connect electricity to a new property, increase your power capacity, or install solar panels in Spain, you will have come across the CIE — the Certificado de Instalación Eléctrica, commonly known as the "boletín eléctrico".

It is one of the most important documents in any Spanish property transaction, and one of the least understood.

This guide explains exactly what the CIE is, when you need one, what it contains, how much it costs, and how to arrange one through our network of certified electricians.

What is the CIE (boletín eléctrico)?

The CIE — Certificado de Instalación Eléctrica — is an official document that certifies your electrical installation is safe, correctly sized, and compliant with Spain's low-voltage electrical regulations (Reglamento BT).

It describes your installation in detail: the maximum power your wiring can handle, the layout of circuits and protective devices, and the characteristics of your supply point.

Think of it as an MOT for your property's electrical system. It is the document that proves your installation is safe and fit for purpose.

When do you need a CIE?

There are four main situations where you will need an up-to-date CIE:

1. New electricity connection (alta nueva)

When you first connect electricity to a property — whether a new build or an existing property that has been disconnected — the distributor will require a valid CIE before activating the supply.

2. Increasing power (subir potencia)

If you want to increase your contracted power, your existing CIE sets the absolute maximum. You cannot exceed the certified "potencia máxima admisible" without a new CIE confirming your installation can handle it.

3. Property over 20 years old + contract change

If your CIE is more than 20 years old and you request certain changes to your contract — such as a supplier switch — the distributor may ask for an updated certificate to confirm the installation is still safe.

4. Technical modifications

Any significant change to your electrical installation — such as converting from single-phase to three-phase, or changing the use of a commercial premises — requires a new or updated CIE.

What does the CIE contain?

A complete CIE must include the following information:

Your name and the property address
The installed power (potencia instalada) and maximum admissible power (potencia máxima admisible)
Supply voltage and system type (single-phase or three-phase)
Details of the consumer unit, circuit layout, and protective devices
Details of the distribution company and the authorised installing company
Results of insulation and earth resistance measurements taken during the inspection
The installer's official signature and registration number

The most important figure for future changes is the "potencia máxima admisible" — this is the ceiling for any future potencia increase.

Who can issue a CIE?

Only a registered authorised electrician (instalador autorizado baja tensión) can inspect an installation and issue a CIE. They are registered with the competent authority in their autonomous community.

Not all electricians hold this qualification — it requires specific low-voltage certification. Uswitch works with a network of authorised installers across Spain who can inspect your installation and issue your CIE promptly.

How much does a CIE cost?

There is no fixed official price for a CIE. The cost varies depending on the size and complexity of the installation, the region, and the individual installer.

For most residential properties, the paperwork and inspection side of a CIE typically costs between €70 and €300. A figure of around €250 is common for the administrative and inspection work alone.

Note that this covers only the certificate — if the inspection reveals deficiencies requiring upgrade works, those additional costs would be quoted separately.

How long is a CIE valid?

The CIE is valid for 20 years from the date of issue. After 20 years, it does not automatically expire, but — as noted above — if you request certain contract changes (such as switching supplier for a property with a very old CIE), the distributor may ask for a fresh inspection.

If you make modifications to your installation, a new or updated CIE must be issued to reflect the changes.

The CIE and solar energy

If you install solar panels in Spain, the CIE plays a central role. Every grid-connected solar installation requires a new CIE that describes the installation including the panels, inverter, and battery (if present).

Your solar CIE must be registered with RAIPRE (Registro Administrativo de Autoconsumo de Energía Eléctrica) — the national registry for self-consumption installations — alongside your registration with the distributor.

The good news is that if you are going solar, Uswitch can handle both the CIE and the full registration process. Read our solar guide

The CIE in Catalonia: the "Boletín Azul"

In Catalonia, the CIE is supplemented by an additional document called the Boletín de Reconocimiento de Instalación Eléctrica (BRIE) — commonly known as the "boletín azul".

The blue bulletin is required by the Catalan distributor (mainly Endesa Distribución) for certain straightforward modifications and has a validity of 6 months. It is an extra step on top of the standard CIE, not a replacement for it.

Need a CIE? We can help.

Uswitch works with a network of authorised electricians across Spain who can inspect your installation and issue your CIE. We handle the coordination — you just need to provide the property details.

Related Guides

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When Do You Need an Electrical Certificate (CIE) in Spain? | UswitchSpain

Find out when you need a CIE (boletín eléctrico) in Spain — from new connections and power upgrades to property sales and solar installations.

How to Get an Electrical Certificate (CIE) in Spain | UswitchSpain

Step-by-step guide to obtaining your CIE (boletín eléctrico) in Spain: finding an authorised electrician, what the inspection involves, costs, and timelines.

How to Increase Your Power (Potencia) Using Your CIE | UswitchSpain

Your CIE determines the maximum power you can contract. Learn how to use your electrical certificate to increase potencia, when you need a new CIE, and what it costs.

Certified Electricians for Your CIE in Spain | UswitchSpain

Uswitch works with a network of authorised electricians across Spain who can issue your CIE (Certificado de Instalación Eléctrica). Fast, verified, professional.

Does the CIE expire?

The CIE is formally valid for 20 years. After that, it does not automatically become invalid, but distributors may request an updated certificate if you make contract changes on a very old installation. If you modify your installation, a new CIE is always required.

Can I increase my potencia without a new CIE?

Only up to the "potencia máxima admisible" shown on your existing CIE. If you want to exceed that figure, you will need a new inspection and a new CIE confirming your installation can handle the higher power.

Who pays for the CIE — the seller or the buyer?

In a property sale, the seller is normally expected to provide a valid CIE as part of the documentation. If one does not exist or is out of date, the buyer typically organises and pays for a new one, often negotiated into the purchase price.

How long does it take to get a CIE?

The physical inspection typically takes under an hour for a standard residential property. Registration with the autonomous community can take from a few days up to a couple of weeks. The distributor has a maximum of 7 days to accept or reject the document once submitted.

Is the CIE the same as an insurance inspection?

No. The CIE is a regulatory certificate required by the electricity distributor. A home insurance inspection is a separate process arranged through your insurer to assess risk. They are unrelated and serve different purposes.