Overview

JST transformateurs is a French manufacturer of electrical transformers headquartered in Lyon, Auvergne-Rhone-Alpes, founded in 1905. It is privately held and reports 200-500 employees and an estimated revenue band of $100-250M. The company designs, manufactures, delivers, and installs power transformers for electricity networks and generation plants, and traction transformers for rail transport. Its clients span the electricity, rail, renewable-energy, and energy-intensive industrial sectors. In April 2026 the company was named a laureate of the ADEME France 2030 program for its JST 220 project.

At a glance

What JST transformateurs makes

JST transformateurs holds ISO 9001 certification and offers power and traction transformers alongside maintenance, repair, and training services.

Products and capabilities described on the company's own site include Steel (source: jst-transformers.eu).

Certifications

JST transformateurs is associated with the following certifications in public sources. Confirm the certified scope for the specific plant producing your part:

• ISO 9001 — jst-transformers.eu

Latest developments

• 2026-07-10 — DÉPART D'UN TRANSFORMATEUR DE 170 MVA POUR L’ÉNERGIE HYDROÉLECTRIQUE FRANÇAISE ⚡ | JST transformateurs (linkedin.com)

• 2026-06-30 — CAP SUR LOGIS-NEUF POUR UN TRANSFORMATEUR 2X40 MVA ⚡ | JST transformateurs (linkedin.com)

• 2026-05-13 — Projet du mois: Modernisation de l’atelier JST | Leaf Ingénierie (linkedin.com)

• 2026-05-07 — La transition énergétique a besoin de transformateurs⚡ | ADEME (linkedin.com)

• 2026-04-17 — Projet laur�at ADEME France 2030 : JST 220 de JST transformateurs (version longue) - ADEME (energierecrute.com)

• 2026-01-23 — Une demande multipliée par quatre, des délais de livraison qui s’allongent et des prix qui flambent : pourquoi la France manque de transformateurs électriques de haute puissance (usinenouvelle.com)

Company details

The company has operated for more than a century, with a reported workforce of 200-500 and an estimated revenue band of $100-250M. JST transformateurs was founded in 1905, has an estimated 200-500 employees, and is headquartered in Lyon, Auvergne-Rhone-Alpes. On the LightSource stability read it is rated "Established & active": 121 years in operation (founded 1905). Holds ISO 9001 certification(s) per public sources.

Frequently asked questions

What does JST transformateurs make?

JST transformateurs is a French manufacturer of electrical transformers headquartered in Lyon, Auvergne-Rhone-Alpes, founded in 1905. It is privately held and reports 200-500 employees and an estimated revenue band of $100-250M. The company designs, manufactures, delivers, and installs power transformers for electricity networks and generation plants, and traction transformers for rail transport. Its clients span the electricity, rail, renewable-energy, and energy-intensive industrial sectors. In April 2026 the company was named a laureate of the ADEME France 2030 program for its JST 220 project.

Where is JST transformateurs headquartered?

JST transformateurs is headquartered in Lyon, Auvergne-Rhone-Alpes (84 Avenue Paul Santy, Lyon, Auvergne-Rhone-Alpes, 69008).

When was JST transformateurs founded?

JST transformateurs was founded in 1905.

How big is JST transformateurs?

JST transformateurs has an estimated 200-500 employees, with revenue in the $100-250M range (estimated).

What certifications does JST transformateurs hold?

JST transformateurs lists ISO 9001 on its website. Confirm the certified scope for the specific plant producing your part.

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Last verified Nov 2026. Is this your company? Request a correction.