Transformer Insulation Companies

The transformer insulation market is projected to reach USD 9.68 billion by 2030 from USD 6.97 billion in 2025, growing at a CAGR of 6.8% during the forecast period. The market growth can be attributed to various interrelated reasons that illustrate the increasing need for reliable, efficient, and sustainable power infrastructure. The expansion of electricity networks is one vital growth factor as governments and utilities look to upgrade aging grids to meet increasing electricity demand with a reliable supply to customers. The integration of renewable energy and sustainable energy sources (wind and solar) is augmenting the demand for transformers with improved insulation systems to improve load characteristics and grid reliability. Urbanization, the expansion of industrial development, and the increase in electric vehicles are increasing the need for power delivery systems that involve insulated transformers for safety and reliability. Increasing reliance on smart grids and digital substations is raising the requirements of insulation materials for extended or improved longevity, increased thermal stress, and higher voltage. Increased regulatory requirements for environmental reasons and reliance on sustainable resources also encourage manufacturers to develop sustainable insulation systems to improve power delivery efficiency while reducing the environmental impact.

Transformer Insulation Companies

The transformer insulation market is dominated by key manufacturers, including DuPont (US), 3M (US), Hitachi Energy Ltd (Switzerland), Krempel GmbH (Germany), WEG (Brazil), Huntsman International LLC (US), Weidmann Electrical Technology AG (Switzerland), Ahlstrom (Finland), delfortgroup AG (Austria), Nordic Paper (Sweden), TOMOEGAWA CORPORATION (Japan), and ALTANA AG (Germany). These players have adopted growth strategies, such as product launches, deals, and expansions, from January 2023 to September 2025, to expand their market share and global reach.

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For instance, in June 2025, during CWIEME 2025 in Berlin, Hitachi Energy showcased two innovations in transformer components that aim to improve insulation and efficient operations in modern grids and energy-framed systems. The first innovation, the GARIP Eco, is a next-generation SF6-free transformer-GIS bushing featuring improved gas sealing and insulation performance designed for high-pressure gas-insulated switchgear. It builds on the proven GARIP platform, ensuring solid dielectric reliability while providing compatibility with various gas mixtures and GIS platforms and in retrofit project applications. The other innovation was Hitachi Energy’s VUBB Compact, a compact on-load tap-changer (OLTC) solution that enables the construction of smaller, lighter transformers as part of the unit’s solution and reduces material use. These advancements increased insulation reliability and led to sustainable, compact transformer designs.

DuPont (US)

DuPont, officially known as E.I. du Pont de Nemours and Company, is a global leader in applied science and innovation, delivering technology-based materials and solutions that help transform industries including electronics, transportation, construction, water, healthcare, and worker safety by delivering with science and expertise technology-based solutions. It operates through three overarching business segments, which are Electronics & Industrial, Water & Protection, and Corporate & Other. Through the Water & Protection business segment, it manufactures transformer insulation paper under the Nomex brand name. It has a presence in North America, Europe, Asia Pacific, South America, and the Middle East & Africa, and has manufacturing, research, and sales companies in these regions. It has a total of 110 manufacturing sites worldwide. In terms of its subsidiaries, as of December 31, 2024, it operates subsidiaries in almost 50 different countries while also operating manufacturing facilities in about 24 different countries. It invested USD 531 million in research and development in 2024.

3M (US)

3M is a worldwide conglomerate organization specializing in scientific advancements in product development across various industries. The company manages over 60,000 products and is categorized into three operational segments: Safety and Industrial, Transportation and Electronics, and Consumer. The Safety and Industrial segment comprises personal safety, industrial adhesives and tapes, abrasives, closures, masking systems, electrical markets, automotive aftermarket, and roofing granules. The company manufactures insulation paper for transformers under the Safety and Industrial segment. It also offers products in over 70 countries and has a series of global research centers and innovation centers. In the US, it operates 51 manufacturing facilities across 26 states and manages 65 manufacturing and converting facilities in 25 countries globally.

Market Ranking

The transformer insulation market is competitive, with five main players collectively holding 45–50% of the total market share. DuPont, Hitachi Energy Ltd, Huntsman International LLC, Weidmann Electrical Technology AG, and Ahlstrom have a considerably high standing in the transformer insulation market, due to a diverse product range, well-developed technology, and international manufacturing capabilities in the underlying technology to retain a solid position. DuPont is well known for its Nomex insulation papers and films, which have excellent operating temperature and mechanical properties and are utilized in high-performance transformers. With an emphasis on innovation and the bulk production of cellulose-based insulation materials for utility and industrial transformer applications, Hitachi Energy Ltd can provide insulation materials that deliver continuity and consistency. Huntsman International provides resin-impregnated papers and pressboards that stand out for their dielectric and mechanical properties. Weidmann Electrical Technology AG manufactures pressboards and insulation papers that are manufactured to precision and will provide durability over extended periods of use. Ahlstrom focuses on cellulose-based insulation papers and sustainable materials based on the exploitation of green technology as available in the market. These five firms command a strong share of the global transformer insulation sector through their focus on quality, continuity, and innovation.

Related Reports:

Transformer Insulation Market by Material (Liquid, Solid Insulation), Voltage Class, Type (Liquid Filled, Dry-type Transformer), End-use Industry (Electrical Utilities, Data Centers, Oil & Gas, Power), and Region - Global Forecast to 2030