Energy

Leading the change towards a more sustainable future.

Líneas de Negocio - Energía

Telecommunications

Advanced solutions for a constantly evolving market.

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Special Projects

Transforming major challenges into unique solutions.

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Energy

Líneas de Negocio - Energía

Telecommunications

Special Projects

Welcome to SEMI

Tradition, experience, and future.

Over 100 years driving the electrical and industrial sectors through innovation, excellence, and quality in all our services.

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Key Figures 2025

0M€

Annual Production

Professional Employees

Our Clients

Clients with whom we have shared successes and goals.

Business Lines

Líneas de Negocio - Energía

Energy

The energy sector faces increasingly pressing challenges, such as the need to address growing energy demand driven by consumption in the most prosperous countries and the emerging needs of developing nations.

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Telecommunications

SEMI began its Telecommunications activity in the 1950s, participating in the construction of Television, Telephone, and Radio networks. Today, we have extensive experience in deploying Fiber Optic Networks and Mobile Telephony Networks.

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Líneas de Negocio - Telecomunicaciones
Líneas de Negocio - Telecomunicaciones

Special Projects

Over time, SEMI has excelled in the execution of specialized civil works, with a particular focus on projects for the Armed Forces, industrial facilities, and demolition and dismantling works, among others.

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Featured Projects

Explore our most outstanding projects

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PFV Matrisol​

Photovoltaic Plants

PFV Matrisol​

Construction of a photovoltaic park with a capacity of over 50 MW, including operation and maintenance (O&M), as well as the energy evacuation infrastructure.

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Granada Metro GIS Electrical Substation

Electrical Substations

Granada Metro GIS Electrical Substation

Construction of a new GIS-type electrical substation inside a dedicated building. In addition to the main transformer installation, the project included fire protection systems, telecontrol, surveillance, auxiliary services, and other facilities. All systems were implemented to supply power to the catenary of Line 1 of the Granada Metro. SEMI participated in the UTE Subestación Nevada […]

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Broadband Network in Peru

Broadband Network in Peru

SEMI has participated in the construction of 140 nodes to enable broadband network access in the regions of Cuzco and Ayacucho. The project is part of the strategic initiatives of the Ministry of Telecommunications of Peru, aimed at delivering fiber optic connectivity to rural areas to provide coverage for both individuals and institutions. To date, […]

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Rehabilitation of Distribution Networks

Rehabilitation of Distribution Networks

Replacement and extension of the Medium Voltage (MV) network, installation of transformers, expansion of the Low Voltage (LV) network, and installation of prepaid and postpaid meters.

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ADD Approach Light System Runway 20

ADD Approach Light System Runway 20

Ampliación del Sistema de Aproximación de la Cabecera de Pista nº20, realizándose una carretera de servicio de mantenimiento, para la instalación de las nuevas luces de aproximación para la pista de vuelo. Incluye el desmontaje de parte de la valla de seguridad de la base y la ampliación de la misma.

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PFV Raditon

PFV Raditon

Operation and Maintenance contract for a photovoltaic plant with a total capacity of 9.5 MW.

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SCHOOL AGE CARE FACILITY REPAIRS, BLDG# 41

SCHOOL AGE CARE FACILITY REPAIRS, BLDG# 41

Comprehensive restoration of both the interior and exterior of Building #41 for its conversion into an early childhood education facility (Daycare). The renovation included adapting interior and exterior spaces to meet the new functions. All work was carried out in strict compliance with the Architectural Barriers Act (ABA). The project involved various tasks, including the […]

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SEMI Around the World

México

Alemania

Francia

República Dominicana

Rumania

El Salvador

España

Panamá

Grecia

Perú

Emiratos Árabes Unidos

Chile

Uruguay

Arabia Saudita


21 September 2026

News

SEMI renews its three Compliance certifications with Bureau Veritas

SEMI has successfully renewed its ISO 37001 (Anti-Bribery Management System), UNE 19601 (Criminal Compliance Management System) and UNE 19603 (Compliance Management System for Competition Law) certifications after successfully completing the audit process carried out by Bureau Veritas. The renewal of these certifications reaffirms the strength of our Compliance model and SEMI’s commitment to ethics, transparency, […]


21 April 2026

News

Safety Awareness and Reflection Sessions

On March 25 and 26, SEMI suspended its activity in Galicia and León to hold awareness and reflection sessions on safety, with a strong focus on prevention and raising awareness. These sessions, held in Ourense and León, were attended by our CEO, Maikel García, as well as Berta Domínguez, HSQ Director, and Julián de Bustos, […]


21 April 2026

News

In line with its commitment to young talent

SEMI is once again taking part in Leoni4, a meeting forum that brings together university students from the Schools of Engineering and companies from the province of León, allowing them to learn first-hand about the companies where they can develop their professional careers.