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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Repowering of the 220 kV Maitencillo-Cardones Line

Live Line Work (L.L.W.)

Repowering of the 220 kV Maitencillo-Cardones Line

Engineering and assembly to increase capacity along 132 km of the 220 kV Maitencillo-Cardones Line. The work involved the installation of extensions, replacement of supports, and insulation changes using Live-Line Work Techniques.

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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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Telecommunications in the Railway and Metro Sector

Telecommunications in the Railway and Metro Sector

The synergies between our Railways and Communications business lines enable us to provide clear added value in telecommunications solutions for railway environments. As a result of these synergies, we have successfully undertaken various projects: We have certified Pilots and Supervisors, allowing us to execute these projects autonomously and on a turnkey basis. Key Projects:

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CNS Photovoltaic Farm

CNS Photovoltaic Farm

Design and construction of a 900 kWp photovoltaic plant, including the installation of 1,363 modules of 660 Wp on a fixed 2V structure with 6 inverters, a step-up transformation center to 12.47 kV, and a power evacuation line to the Power Plant.

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Special Infrastructures

Special Infrastructures

We provide engineering, manufacturing, and assembly solutions for special infrastructures across various telecommunications activities, with designs tailored to meet our clients’ needs.

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PFV Miraflores

PFV Miraflores

Construction of three photovoltaic plants with a total capacity of 32.8 MW, featuring single-axis tracker structures, delivered under a turnkey contract, including operation and maintenance services.

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Los Remedios Photovoltaic Project

Los Remedios Photovoltaic Project

Execution of the EPC contract for the Los Remedios photovoltaic park with a total capacity of 25.6 MW.

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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


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 […]


27 November 2024

News

We Made Changes to One of the Main Cell Towers in Cambados

We upgraded one of Cambados’ main cell towers to adapt it for 5G technology.SEMI successfully completed a project for Vantage Towers to adapt the infrastructure for the installation of new 5G antennas. You can read the news in Diario de Arousa. A massive crane in the center of Cambados caught the attention of passersby. SEMI […]


27 November 2024

News

SEMI Awarded for Its Business Excellence

Last Friday, October 4th, the second edition of the “Awards for Business Excellence” gala took place at the Atalaya Museum in Jerez de la Frontera. The event, organized by Rino Alquileres, Cesma Maquinaria, and the financial institution IberCaja, honored SEMI with the award for “Professional Career.” The ceremony, hosted by Enrique Gallego, presenter for the […]