On July 22, the No. 1 tunnel on the connecting highway between the upper and lower reservoirs of the Taishun Pumped Storage Power Station project was successfully holed through after 376 days, opening up the ** transportation hub connecting the upper reservoir and the lower reservoir of the power station and laying a solid foundation for subsequent construction. To date, the cumulative total length of tunnels holed through on the project has exceeded 10,000 meters.

The No. 1 tunnel on the connecting highway between the upper and lower reservoirs has a total length of 2,090.7 m, a maximum longitudinal slope of 5.5%, and Class II and Class III surrounding rock accounting for 95%. A total of 3 emergency parking bays are provided, each 50 m long, totaling 150 m. The widened sections total 283 m and are provided in two segments, with a cross-section size of 13.05 m × 9.7 m (width × height). The normal section is 1,657.7 m long, with a cross-section size of 9.3 m × 9.6 m (width × height). Its starting point connects to the end point of the access highway, and it is the longest of the four highway tunnels on the connecting highway between the upper and lower reservoirs.

To ensure the smooth holing-through of the tunnel, the construction party actively overcame a series of technical difficulties, including the long access routes into the tunnel through the branch tunnel group, difficult ventilation and smoke exhaust, the complex construction environment, and the high risk of treating dangerous rock masses at the tunnel portal. It continuously strengthened safety management, controlled project construction quality, and carried out safety and technical briefings effectively, thereby effectively eliminating hidden dangers in construction while promoting the rapid progress of project construction and ensuring that the safety and quality of all construction milestones remained "controllable, under control, and manageable."

As Wenzhou's power system's "super power bank," the Taishun Power Station project has advantages such as high safety assurance, good flexible regulation performance, and excellent environmental benefits. After completion and commissioning, it will fully play the role of the power grid's "energy storage device," effectively filling the gap in pumped storage power stations in the southern Zhejiang region, driving local economic growth, increasing Taishun's fiscal revenue and tax receipts, absorbing 1.6 billion kWh of surplus low-load electricity from the power grid, and providing 1.2 billion kWh of peak electricity. It can save 82,000 tons of standard coal per year, replace 1.32 million kilowatts of coal-fired power installed capacity, achieve peak shaving and valley filling, and reduce the shutdown and adjustment of units within the grid. It will safeguard the Zhejiang power grid's acceptance of out-of-region electricity and better accommodation of new energy, strongly promote the development of clean energy and renewable energy, and help optimize and adjust the national energy structure.