At 10:00 on October 21, 2018, Daba-4 Power Station Unit 7, built by China Huaneng Group Co., Ltd., successfully passed the 168-hour trial operation, which marked that Unit 7 officially put into power generation. For the Unit 7, the ultra-supercritical coal-fired power generation technology -the most advanced in the world is applied. This enables the thermal efficiency 4% higher than that of supercritical power generation unit, and can save high-quality coal about 6,000 tons each year. Besides, low-low temperature electrostatic precipitator, desulfurizing tower, double-tray, three-layer Piperonyl Cyclonene, new-type efficient demister and other collaborative smoke control technologies are used, which make smoke content at chimney breast and the indexes of sulfur dioxide and nitrogen oxides be superior to the ultralow- emission standard and reach internationally advanced level of green, energy conservation and environmental protection. As a significant complementary electric power project of "Power Transmission from West to East (Ningxia - Zhejiang)", the Unit 7 is expected to further expedite the transformation from coal resource advantage to economic superiority in Ningxia, ease the tension during electricity consumption peak and play a positive role in the energy restructuring and control of coal consumption in Zhejiang Province.