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HV/LV Transformer
Substations
Standard & Custom

Every substation is delivered fully equipped — never a bare prefab

French manufacturer of prefabricated concrete HV/LV transformer substations. Turnkey, compliant with NF C 13-100 and NF C 13-200, CONSUEL and ENEDIS approved.

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5–10m
Range of available sizes
100%
Factory tested
NF C
13-100 / 13-200 Certified
2
Ranges: Standard & Custom
Our Mission

Design.
Manufacture.
Install.

PREFA FRANCE specialises in the manufacture of fully prefabricated concrete HV/LV transformer substations. Our patented system BÉTONBLOK guarantees consistent quality, rapid installation and full compliance with French and European standards.

Every substation leaves our factory fully equipped, tested and certified. No bare concrete, no laborious on-site assembly — we deliver a turnkey operational infrastructure.

"Because electricity leaves no room for approximation, neither do we."

Our Certifications
PREFA FRANCE BÉTONBLOK substation manufacturing
Our Ranges

Two solutions,
one single excellence

Standard for the ENEDIS public network, Custom for industrial and specific projects. In both cases: turnkey delivery, fully equipped, certified.

Standard Range

BÉTONBLOK Standard

Designed for connection to the ENEDIS public network. Approved, fully equipped, compliant with NF C 13-100. From 5 to 10 metres.

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Custom Range

BÉTONBLOK Sur-mesure

Custom solutions for industry, special projects and architectural constraints. Adapted power and dimensions.

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Why BÉTONBLOK

The advantages of the system

High Performance

High density concrete, optimised thermal insulation, certified structural resistance. Designed to last several decades without heavy maintenance.

Ease of Installation

Installed by crane in a single operation. No masonry on site. Civil engineering is limited to preparing the raft slab according to our dimensional plans.

Time Saving

Accelerated delivery and commissioning thanks to controlled factory manufacturing. Significant reduction in construction lead times.

Robust Construction

Monolithic concrete structure, resistant to intrusion, weather and impacts. Superior durability to metal constructions.

Value for Money

Savings on labour costs, reduced construction risks and total control of timelines. A predictable and cost-effective investment.

Complete Range

5 sizes from 5 to 10 metres for the standard range. Custom solutions with no configuration limits. A single point of contact from study to commissioning.

Our Process

From study to commissioning

Complete support at every stage of your project.

Study

Analysis of your technical needs, site constraints and regulatory requirements. Tailored proposal.

Manufacturing

Controlled factory production. High density concrete, complete electrical equipment, tests before dispatch.

Transport

Delivery by semi-trailer. Full logistics coordination, systematic pre-site visit.

Commissioning

Crane installation, connection, CONSUEL validation, assisted commissioning. Turnkey.

Compliance & Certifications

A standard of excellence without compromise

NF C 13-100
HV substations
NF C 13-200
LV networks
CONSUEL
Certification
ENEDIS
Official partner
Safety Commission
Approved
BÉTONBLOK
Patented System
View all our certifications
Press room

Latest news

All articles
Multitechnique electrical services in high voltage: why work with an expert partner?
27 March 2026

Multitechnique electrical services in high voltage: why work with an expert partner?

In an industrial environment where service continuity is critical, high-voltage electricity tolerates no approximation. Maintenance, troubleshooting, compliance: every intervention demands rigour, expertise and responsiveness.

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HV substations: 2027 approaches — anticipate wisely to secure your installations and control costs
9 February 2026

HV substations: 2027 approaches — anticipate wisely to secure your installations and control costs

By 2027, standards applicable to HV switchgear cells will evolve, as part of the progressive phase-out of SF₆. This regulatory change will lead to a transformation in the product ranges available on the market.

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Prefabricated high-voltage substations: manufacturing and typologies on the European market
17 October 2025

Prefabricated high-voltage substations: manufacturing and typologies on the European market

PREFA FRANCE designs and manufactures complete electrical stations, delivered turnkey. Discover the different typologies of prefabricated HV/LV substations and the advantages of prefabrication.

Read Article
Ready to start your project?

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tailored

Our technical team analyses your project and responds within 48 hours. No commitment at this stage.

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