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• Comment: In accordance with the Wikimedia Foundation's Terms of Use, I disclose that I have been paid by my employer for my contributions to this article. Mdivnouuu (talk) 13:10, 26 May 2026 (UTC)

Trench Group GmbH is a manufacturer of high-voltage components headquartered in Berlin, Germany. Until April 2024, the company was part of the Siemens Energy group. Trench produces bushings, instrument transformers, and air-core reactors (coils) for high-voltage transmission networks, supplying grid operators and system integrators worldwide.

The company looks back on a history of more than 125 years. Its name traces back to Canadian engineer Tony Trench, a pioneer in the development of air-core reactors for high-voltage networks in the early 1960s.

In 2004, Siemens acquired the Trench Group, which then had 1,800 employees, for a purchase price of 285 million euros. At the time, Trench operated production facilities in Europe at its German site in Bamberg, as well as in Austria, Switzerland, the United Kingdom, and France. Globally, the group also produced in China, Brazil, and Canada.^[1] Following the spin-off of Siemens Energy in April 2020, Trench became part of Siemens Energy.

Until April 2024, the Trench Group was part of the Siemens Energy group. In October 2023, Siemens Energy announced the divestiture of the business through a carve-out to financial investor Triton Partners. The purchase price was in the mid-three-digit million euro range. As part of the transaction, Siemens Energy secured a long-term supply agreement, as Trench Group's high-voltage components continue to be required for its own transformers and switchgear. The transaction was completed in April 2024.^[2][3]

Bushings connect overhead lines and cables to transformers and insulate the current at extra-high voltages of 380 kilovolts and above. The components range from one to fifteen meters in length and can reach a diameter of up to one meter. The core is manufactured from thin aluminum foils, built up in alternating layers with paper, and subsequently embedded in synthetic resin.^[3][4]

Instrument Transformers measure current and voltage in substations at voltages of up to over one million volts. Trench is considered a technology leader in the field of high-voltage instrument transformers.^[3][4]

Air-Core Reactors (Coils) stabilize voltage and frequency in the power grid. They can reach a diameter of up to five meters.^[3][4]

The company's registered office is in Berlin. The Trench Group operates eleven production sites in eight countries, including facilities in Germany (Bamberg and Troisdorf, under the brand HSP Hochspannungsgeräte GmbH), Canada, China, Austria, France, Italy, and Bulgaria.

At the end of February 2026, a newly built facility of subsidiary HSP USA in the US state of North Carolina (Charlotte) commenced assembly operations; the official opening is planned for July 2026. The total investment amounts to approximately 60 million US dollars.^[2][5]

The CEO is Bahadir Basdere, a mechanical engineer with a doctoral degree, who has led the company since 2019 and previously spent twenty years at Siemens.^[2]

In September 2025, the Trench Group acquired Australian technology company H Nu, thereby expanding its portfolio to include fiber optic current sensor technology. The technology offers particular advantages for high-voltage direct current (HVDC) transmission and is to be qualified as a future standard for high-voltage measurement. It was the first acquisition in the Trench Group's corporate history.^[6]

In December 2025, the Trench Group reached an agreement with Maschinenfabrik Reinhausen to acquire the composite insulator production assets of Reinhausen Power Composites (RPC). The transaction encompasses machinery, equipment, software, and intellectual property for the manufacture of hollow-core composite insulators up to 800 kV. The assets are to be transferred to the Trench facility in Bamberg from summer 2026 onwards.^[3][7]

In March 2026, the Trench Group completed the acquisition of Italian manufacturer Enerlux Power SRL (effective: 2 March 2026). Enerlux, headquartered in Viadana, produces capacitors and power factor compensation systems for medium- and high-voltage applications, and will be integrated into Trench Group's Grid Reliability business unit.^[8]

The Trench Group supplies grid operators such as TenneT, 50Hertz, and Amprion, as well as international system integrators including Siemens Energy, GE Vernova, and Hitachi Energy. Some of these system integrators are also competitors in the market for high-voltage components.^[2][4][8][9]

Revenue grew from approximately 500 million euros (2022/23) to 906.5 million euros (2025), an increase of 33 percent compared to the prior year (2024: 683.6 million euros). The order backlog stands at approximately 1.8 billion euros. The company employs approximately 3,000 people worldwide (as of early 2026), compared to approximately 2,500 at the time of the carve-out in 2023/24.^{[2][3][8][10]}