Increasing the Electrical Capacity of Commercial Premises in Catalonia

Increasing the contracted electrical capacity of commercial premises in Catalonia does not always require a new certificate or alterations. If the installation is no more than 20 years old, the requested capacity remains within its documented maximum admissible capacity and no circuits are changed, the increase may be handled as a contractual request without additional safety documentation. This does not guarantee that the requested supply is available: the distribution company must also consider the network and supply conditions.

The route changes if the requested capacity exceeds that documented limit, circuits must be added or altered, the installation is over 20 years old, the activity changes or the premises fall within a category requiring a project or inspection. Before contacting the electricity retailer, establish the business’s actual demand, retrieve the existing electrical records and arrange an appropriate technical review.

Understand the three capacity figures first

Contracted capacity is the figure agreed under the electricity supply contract. Maximum admissible capacity is the certified limit supported by the installation and its documentation. Installed capacity relates to the equipment and loads connected or intended to be connected. None should be confused with the business’s actual demand, which depends on factors such as simultaneous operation of machinery, air conditioning, ovens, refrigeration and hot-water equipment.

Prepare a simple comparison of the present contracted capacity, the documented maximum admissible capacity and the capacity required by the proposed activity. The last figure should not be calculated merely by adding every appliance rating: operating patterns, simultaneous loads and reasonable future expansion should be assessed. The CUPS supply-point code, the building’s connection arrangements and the distribution network’s ability to serve the request may also need consideration.

Retrieve the existing CIE installation certificate, evidence of RITSIC registration, previous project or technical design memorandum, single-line diagram, legalisation date and latest inspection certificate where applicable. These records establish the documented position. An administrative correction to the register cannot replace the legalisation of a genuine physical extension or alteration. [2] [5]

• Contracted capacity: the amount agreed through the electricity retailer.
• Maximum admissible capacity: the installation’s documented certified limit.
• Required capacity: the assessed demand of the intended business activity.
• Supply availability: the ability of the network and building connection to meet the request.

Decision tree: contract change, BRIE or CIE?

Start with three questions. Is the installation 20 years old or less? Will the final capacity remain within its documented maximum admissible capacity? Will the installation remain physically unchanged? If every answer is yes, the Generalitat’s guidance provides for a contractual increase without additional safety documentation. If the final figure exceeds the maximum admissible capacity, a low-voltage electrical installation certificate, known as a CIEBT or CIE, and the corresponding proof of registration are required. Any inadequate boards, conductors or protective devices must first be adapted. [2]

A BRIE, or boletín de reconocimiento de instalaciones eléctricas, is not a universal substitute for a CIE. For installations documented through a technical design memorandum, the official guidance allows a BRIE in certain cases only where the final capacity is no more than 50% above the regulatory minimum load for that type of premises and does not exceed 20 kW. Both conditions must be satisfied, and this route may be unsuitable where physical work constitutes an extension or alteration. [2]

Installations over 20 years old receive different treatment. In the circumstances covered by the guidance, the distribution company must verify the installation. If the result is unfavourable, defects must be corrected and the work supported by a BRIE, a registered CIE or an inspection by an authorised control body, depending on the installation. Current requirements should always be confirmed with the relevant official bodies when applying. [2]

• Within the admissible limit, no physical changes and no more than 20 years old: a contract-only route may be possible.
• Above the maximum admissible capacity: a CIE and registration evidence are required.
• New circuits: treated as an extension of the installation.
• Changes to existing circuits: treated as an alteration.
• Over 20 years old: allow for verification and possible remedial work.

When a technical design, project and inspection are required

The choice between a technical design memorandum and an electrical project does not depend on capacity alone. Under ITC-BT-04 of Spain’s Low-Voltage Electrotechnical Regulation, premises open to the public and premises presenting a fire or explosion risk require a project regardless of capacity. For buildings used mainly for housing, commercial units and offices that are not open to the public, the provision includes a threshold above 100 kW per general protection box. Installations outside the project categories are documented through a technical design memorandum. [4]

For an extension or alteration requiring a project, Canal Empresa lists the responsible declaration, the project, the ELEC-4 works supervision and completion certificate, a certificate issued by an authorised electrical installer, a favourable initial inspection where applicable, evidence of RITSIC registration, and updated operating and maintenance instructions. A suitably qualified professional must prepare and supervise the project where the regulations require one. [5]

Where a memorandum is sufficient, the listed records include the responsible declaration, ELEC-3 technical design memorandum, ELEC-2 single-line diagram, installation certificate, updated operating and maintenance instructions, an updated route sketch and evidence that the extension or alteration has been registered in RITSIC. Form names and submission requirements can change, so check Canal Empresa and Tràmits Gencat before filing. [5]

• Authorised electrical installer: carries out and certifies work within its authorised scope.
• Competent qualified professional: prepares and supervises a project when required.
• Authorised control body: conducts the applicable regulatory inspections.
• RITSIC: Catalonia’s register of industrial safety installations; it is distinct from RASIC, the register of authorised agents.

Practical steps before requesting the increase

Begin by listing machinery, cooking appliances, refrigeration, air conditioning, hot-water production, vehicle charging and other significant loads. Then inspect the main board, protective devices, conductor sizes, voltage drop, earthing arrangements and circuit capacity. This should take place before signing a lease or purchasing equipment where electrical capacity is critical. The review should also identify whether the proposed machinery or change of use affects the activity authorisation or technical design for the premises.

If circuits are added, the work is an extension; if existing circuits are changed, it is an alteration. Either situation may require technical documentation and a new responsible declaration in RITSIC. Under Catalonia’s industrial safety framework, the declaration for commissioning, alteration or extension must be submitted before the relevant work is put into service. The electrical legalisation and the contractual supply increase are connected, but they are separate procedures involving different parties. [3] [8]

Where periodic inspection is mandatory, verify that the latest certificate is both current and favourable. Generalitat guidance states that an installation company must not issue the certificate for an extension or alteration if the owner lacks the required current, favourable periodic inspection certificate. An expired inspection can therefore prevent certification until the position has been regularised. [6]

• Calculate realistic demand, including simultaneous operation and future needs.
• Retrieve the CIE, design records, diagram, RITSIC evidence and inspection certificates.
• Compare contracted, maximum admissible and required capacity.
• Confirm the installation’s age and the regulatory classification of the premises.
• Inspect boards, circuits, conductors, protection and earthing arrangements before designing work.

Costs, timing and avoidable delays

The published administrative fee consulted for the low-voltage responsible declaration is €11.65, but this is not the total cost of increasing capacity. The amount may change and must be checked on Tràmits Gencat on the filing date. Other costs may include the technical survey, memorandum or project, professional supervision, installer’s work, materials, an authorised control-body inspection and work affecting the building connection or supply arrangements. [3] [7]

There is no reliable standard completion time. The sequence and duration depend on whether the records are available, the extent of physical work, whether a project and inspection are needed, defects requiring correction, issuance of the RITSIC registration document and any action by the distribution company. A sensible sequence is assessment, design, installation, inspection where applicable, registration and then the contractual request with the required evidence.

Common causes of delay include leasing premises without checking their maximum admissible capacity, assuming any ‘electrical bulletin’ will be accepted, overlooking a public-access classification, installing new circuits without registering the extension, or presenting a technical alteration as a simple correction of data. The electrical work should also be coordinated with the activity file if the use, equipment or technical conditions of the premises change.

• Do not request the increase before checking the documented and physical installation.
• Do not commission a BRIE where a CIE or project is required.
• Do not put new or altered circuits into service before completing the applicable procedure.
• Do not assume that adequate internal wiring means the network can supply the requested capacity.
• Do not treat the published administrative fee as the total project price.

Frequently asked questions

Can I increase the contracted capacity without building work?

It may be possible where the requested capacity remains within the documented maximum admissible capacity, the installation is no more than 20 years old and nothing is physically altered. The distribution company must still assess supply feasibility. Older installations, missing documentation or an inadequate building connection may lead to verification or further work.

What is the difference between a BRIE and a CIE?

A BRIE is an electrical installation recognition report accepted only in specified circumstances. A CIEBT, commonly shortened to CIE, certifies a low-voltage installation. When the requested capacity exceeds the documented maximum admissible capacity, the CIE must be accompanied by the relevant registration evidence. The documents are not interchangeable.

Can an electrical capacity increase affect an activity licence?

A contract-only increase within the legalised capacity does not by itself amount to an alteration of the business activity. However, new machinery, cooking equipment, air conditioning, additional circuits or a change of use may alter the activity project or declared conditions. Review the electrical installation and activity file together before carrying out the work.