[Haichuan Overseas Engineering] 400 kV substation of the United Solar Polysilicon project in Oman successfully connected to the grid

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Recently, the 400 kV substation of the Oman United Solar Polysilicon project, which was EPC-general contracted by China Energy Engineering Group Shanxi Electric Power Engineering Company, was successfully connected to the grid. This critical milestone provides a solid foundation for the commissioning and operation of the various production systems in the project, as well as for the full-scale supply of electricity. It marks a significant advancement in the construction of the Oman United Solar Polysilicon Plant, offering strong support for the commissioning and power supply of its various production systems in the future. The project is located deep in the Oman desert, where the natural environment at the construction site is extremely harsh; summer temperatures often exceed 50 degrees Celsius, posing serious challenges to construction planning, equipment calibration, and the work of the personnel involved. Faced with these challenges, the project team rose to the occasion by not only strictly adhering to the construction standards set by Oman’s **Oman Electric Transmission Company (OETC)** and efficiently deploying local resources, but also implementing thorough control over safety, quality, and progress throughout the entire process, ensuring that all key milestones were met on time and enabling the project to achieve its goal of achieving grid connection on schedule. According to public information, this polysilicon plant, with a total investment of $1.6 billion and an annual production capacity of 100,000 tons, has made rapid progress since its construction began in March 2024. By early 2025, the main structure and equipment installation were completed, and it is now in the final stages of equipment testing and pipeline connection. Industry experience shows that it usually takes 3–6 months to complete the comprehensive system testing after a substation is connected to the grid. Based on the latest progress of the project, official operation is expected to begin in the first quarter of 2026, which is a slight delay from the original target of the end of 2025; however, this is still within the normal construction timeline.