Energy Infrastructure
for National and European Power Grids

SELT delivers overhead transmission lines, underground cable systems and high- and medium-voltage electrical substations across Italy and Europe, supported by a structured organisation and project delivery capabilities up to turnkey EPC contracts.

300+ professionals coordinating projects across multiple countries, with direct technical oversight throughout every stage of project execution.

SELT is an Italian contractor specializing in the construction of high-voltage power transmission infrastructure.

With an established presence in Italy, France, Belgium and the Netherlands, the company supports utilities, transmission system operators and general contractors in the development and upgrading of new and existing power infrastructure, delivering projects of up to 420 kV.

+ 25

Years of Experience

300 +

Specialist Professionals

420 kV

Maximum Voltage Level

4 Countries

Established Presence in Italy, France, Belgium, and the Netherlands

Our
Services

Three specialist disciplines coordinated within a single technical organisation.

Contact Us

Electrical Substations

Design and construction of electrical substations and National Transmission Grid connection infrastructure for renewable energy projects.

Overhead Transmission Lines

Construction and maintenance of overhead transmission lines up to 420 kV, including specialist foundations and OPGW installation.

Underground Cable Installation

High- and medium-voltage underground cable systems, with specialist expertise in cable jointing, terminations and trenchless technologies (HDD)

Selt projects

SELT has contributed to the construction and upgrading of power transmission infrastructure across Italy and several European countries, delivering overhead transmission lines up to 420 kV and high- and medium-voltage electrical substations for renewable energy projects.

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Trusted by Industry Leaders

SELT works in long-term partnership with Europe’s leading power transmission operators and infrastructure developers. Our key clients include national transmission system operators such as Terna (Italy), Elia Group (Belgium), RTE France and TenneT (the Netherlands), as well as leading renewable energy investors including Sonnedix and IB Vogt.

  • Sustainability

    ECOVADIS – EN

  • Legality

    Legality Rating

  • Anti-corruption management system

    UNI EN ISO 37001:2025 – EN

  • Energy management

    UNI EN ISO 50001:2018 – EN

  • Gender equality

    UNI PdR 125:2022 – EN

SELT is

Certified Quality

We operate in accordance with the highest international standards, integrating ESG principles into every stage of project delivery. Our certifications reflect a transparent, resilient and quality-driven organisational model.

Careers

Working at SELT means contributing to strategic energy infrastructure projects within well-structured construction sites and high technical standards.