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

Advanced solutions for a constantly evolving market.

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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 2024

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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Live-Line Work in the Province of León

Live Line Work (L.L.W.)

Live-Line Work in the Province of León

Live-Line Work in the Province of León

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FTTH and FTTN Network Deployment

Fiber Optic Networks

FTTH and FTTN Network Deployment

SEMI has been involved in the deployment of FTTH networks, with over 100,000 homes passed, and FTTN links, with more than 3,000 connected nodes. These projects add to SEMI’s extensive experience in the deployment and maintenance of fixed networks, both for operators and carriers, as well as utilities, in aerial and underground environments.

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Broadband Network in Peru

Broadband Network in Peru

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

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Medium Voltage Telecontrol (MT)

Medium Voltage Telecontrol (MT)

Telecontrol of the Transformation Centers within ENEL‘s network at both national and international levels. SEMI collaborates with leading medium-voltage cell manufacturers, integrating the SETIS RTU into their transformation assemblies.

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PE Andella

PE Andella

A 50 MW wind farm, with works consisting of civil construction, as well as electrical infrastructure and power evacuation systems.

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Commissary & Navy Exchange

Commissary & Navy Exchange

Construction of a building designated for a shopping center and warehouses with a total built area of 19,000 m², including public roads and parking facilities.The building features a metallic structure with trusses and a full perimeter of reinforced concrete walls. The project included all standard installations as well as industrial refrigeration chambers.

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AIRCRAFT PARKING EXPANSION

AIRCRAFT PARKING EXPANSION

The primary objective of this project is to protect aircraft from Foreign Object Damage (FOD). To achieve this, a Design and Construction project was carried out at the Rota Naval Base Airport, involving improvements to the shoulders of the runway and taxiway, as well as a new Drainage System based on the modification and expansion […]

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SEMI Around the World

España

Francia

Alemania

Rumanía

Israel

Arabia Saudita

Chile

Panamá

El Salvador

República Dominicana

México

Marruecos

Uruguay

Perú

Grecia


23 September 2025

News

SEMI awarded a new project at Morón Air Base

SEMI has been awarded the CNS Alternate Transformer Substation project at Morón Air Base in Morón de la Frontera (Seville). The contract includes the expansion of the existing substation and the construction of a new Air-Insulated Substation (AIS), together with a control building that will house medium-voltage, metering, and protection systems. With this new award, the SEMI Special Projects […]


15 September 2025

News

SEMI Reaffirms Its Ethical Commitment with ISO 37001, UNE 19601 and UNE 19603 Certifications

At SEMI, we have successfully renewed our certifications in ISO 37001 (Anti-Bribery Management Systems) and UNE 19601 (Criminal Compliance Management Systems). These recognitions endorse the robustness of our compliance model and strengthen our commitment to transparency, ethics, and sound corporate governance. As part of the same audit process, SEMI also renewed its UNE 19603 certification […]


7 March 2025

News

Nueva adjudicación en Sevilla

El pasado 19 de diciembre de 2024 se nos comunicó oficialmente la adjudicación del proyecto de JRC/SVQ/2023/RP/1865 – OBRAS DE CONSTRUCCIÓN DEL NUEVO EDIFICIO DEL JRC EN SEVILLA, impulsado y financiado por la Comisión Europea.  De mano de la constructora San José, con la que vamos en UTE, la Delegación de SEMI Proyectos Especiales Europa […]