#### Introduction
Oil-immersed transformers, as critical equipment in power systems, have undergone significant technological advancements and market changes globally in recent years. Since 2025, with the acceleration of global energy transition and the continuous growth of power demand, oil-immersed transformers have made important progress in technological innovation, market applications, and environmental requirements. This article compiles and analyzes relevant overseas news since 2025.
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#### 1. **Technological Innovations and R&D Progress**
**1.1 Launch of High-Efficiency Oil-Immersed Transformers**
In 2025, leading transformer manufacturers worldwide introduced a new generation of high-efficiency oil-immersed transformers. These transformers utilize advanced amorphous alloy materials and optimized cooling systems, achieving energy efficiency levels of IE4 or even IE5, significantly reducing operational losses. For example, Siemens and ABB launched high-efficiency transformers for renewable energy projects in Europe and North America, garnering widespread attention.
**1.2 Application of Smart and Digital Technologies**
With the development of the Internet of Things (IoT) and artificial intelligence (AI), the intelligence level of oil-immersed transformers has significantly improved. In 2026, General Electric (GE) launched an oil-immersed transformer equipped with an intelligent monitoring system, capable of real-time monitoring of temperature, oil level, and load status, with remote management through a cloud platform. This technology has been widely adopted in off-grid power systems in South America and Africa.
**1.3 Development of Eco-Friendly Insulating Oils**
To meet environmental requirements, since 2025, several companies have begun developing eco-friendly insulating oils. For instance, Toshiba of Japan introduced a plant-based insulating oil that not only offers excellent insulation performance but is also biodegradable, reducing environmental impact. This innovation has been highly praised in European and North American markets.
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#### 2. **Market Demand and Application Scenarios**
**2.1 Promotion of Renewable Energy Projects**
With the rapid development of global renewable energy, the application of oil-immersed transformers in wind and solar projects has significantly increased. In 2025, several large-scale solar power stations in India and Brazil adopted high-efficiency oil-immersed transformers to meet high-voltage and high-capacity power transmission needs.
**2.2 Demand for Urban Grid Upgrades**
In developed countries such as those in Europe and North America, urban grid upgrades and renovations have created new market opportunities for oil-immersed transformers. In 2026, Électricité de France (EDF) announced plans to replace aging transformers in Paris with new high-efficiency oil-immersed transformers to improve grid reliability and energy efficiency.
**2.3 Power Infrastructure Construction in Developing Countries**
In regions such as Africa and Southeast Asia, the construction and expansion of power infrastructure have provided a broad market space for oil-immersed transformers. In 2025, several rural electrification projects in Nigeria and Vietnam adopted oil-immersed transformers to support the development of off-grid power systems.
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#### 3. **Environmental Protection and Sustainable Development**
**3.1 Stringent Environmental Regulations**
Since 2025, many countries and regions worldwide have strengthened environmental requirements for power equipment. The European Union introduced new energy efficiency regulations, requiring transformer manufacturers to reduce carbon emissions and use eco-friendly materials. This policy has driven the development of high-efficiency and eco-friendly oil-immersed transformers.
**3.2 Circular Economy and Recycling**
In 2026, several companies began exploring recycling technologies for oil-immersed transformers. For example, Schneider Electric launched a transformer recycling program, dismantling and reusing materials from old transformers to reduce resource waste and environmental pollution.
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#### 4. **Market Competition and Industry Dynamics**
**4.1 Mergers and Collaborations**
Since 2025, mergers and collaborations in the global transformer industry have been frequent. For instance, ABB partnered with an Indian transformer manufacturer to jointly develop oil-immersed transformers suitable for high-temperature environments. This collaboration further solidified ABB's position in the South Asian market.
**4.2 Rise of Emerging Markets**
With the rapid economic development of Southeast Asia and Africa, the demand for oil-immersed transformers in these regions has significantly increased. In 2026, transformer manufacturers from China and India increased their investments in the African market, offering multiple oil-immersed transformers suitable for high-temperature and high-humidity environments.
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#### 5. **Future Outlook**
**5.1 Technological Innovation Will Continue to Drive Industry Development**
In the future, with the application of new materials, processes, and smart technologies, the performance and efficiency of oil-immersed transformers will further improve. Eco-friendly insulating oils and high-efficiency designs will become the main directions for industry development.
**5.2 Market Demand Will Continue to Grow**
The growth in global power demand and the popularization of renewable energy will bring continuous market opportunities for oil-immersed transformers. Particularly in developing countries, the construction and upgrading of power infrastructure will be a major driving force.
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