This is a section of Tai-power maintenance road near the Qilai Tai-power hut. The Nenggao Traversing Trail from the Japanese occupation period became Taipower's maintenance road after the war. In order to send the remaining hydroelectric power generation in the east to the west, which was in urgent need of electricity, so as to develop Taiwan's economy, the old east-west transmission line was built in 1950. For the maintenance of transmission lines, Taipower rebuilt the police posts left from the Japanese occupation period as a Tai-power station. There are nine spots in total, namely Wushe, Lushan, Yunhai, Tianchi, Junlin, Qilai, Panshi, Longjian and Tongmen, that provide accommodations for transmission line maintenance personnel, and storage for emergency repair equipment. Nenggao Traversing Trail became the main road for Taipower to patrol the tower. At the end of 1970, Taipower planned the "Qilai Water Diversion Project" to develop the water power of Papaya Creek, and built underground water diversion tunnels and dams in the middle and upper reaches of Papaya Creek. For the convenience of the construction and improving the maintenance road, a road for automobiles were opened from Tongmen to Qilai, and built the Tianchang Tunnel on the Tianchang Cliff. After the road was completed, there were only 27 kilometers of Nenggao Traversing Trail left from Tunyuan to Wujiabeng Mountain.
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