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Energy

Leading the change towards a more sustainable future.

Telecommunications

Advanced solutions for a constantly evolving market.

Special Projects

Advanced solutions for a constantly evolving market.

Energy

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

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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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 (L.L.W.)

Live-Line Work in the Province of León

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Photovoltaic Plants

Agenor Photovoltaic Project

Execution of the EPC contract for the Agenor photovoltaic park with a total capacity of 50 MW.

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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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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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Demolish NSGA Facility

Demolición de 8 Edificios y sus Vías de Acceso, incluso desmantelamiento de las instalaciones y equipos con recuperación de materiales. Posteriormente el reacondicionamiento paisajístico de toda la zona tratada.

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Montamara-Tavascán

The old telecontrol system of the Montamara-Tavascán Hydroelectric Plants, comprising a total of 5 hydraulic units with interconnection between them, was modernized. SEMI’s IDACS RTU technology and SCADA Control Suite were implemented.

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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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