Seabata Mahao
Clocking a significant milestone in the implementation of the second phase of the Lesotho Highlands Water Project (LHWP II), the Lesotho Highlands Development Authority (LHDA) this week celebrated the arrival of the first of two double-shielded tunnel boring machines (TBMs) at the Caledonspoort Bridge in Botha-Bothe.
The TBM, which will be used to excavate the 38-kilometer Polihali Transfer Tunnel, is a crucial component of the Lesotho Highlands Water Project II (LHWP II).
Manufactured by CCCC Tianhe of China and designed by the U.S.-based company Robbins, the TBM embarked on its journey from Shanghai Port in China on July 20, 2024. It reached Maydon Wharf in Durban, South Africa, on August 26, before being transported to Lesotho by truck.
At the welcoming ceremony, LHDA Chief Executive, Tente Tente highlighted the machine’s impressive specifications. Weighing over 900 tons and measuring 423 meters in length, the TBM will be assembled over the next 60 days before commencing excavation.
“Today, we are welcoming one of the largest machines ever used to bore a tunnel between Polihali and Katse Dams,” Tente said.
The TBM is expected to significantly speed up the excavation process, advancing at a rate of 20 meters per day compared to 7.3 meters using traditional drill-and-blast methods. A second TBM is anticipated to arrive in Lesotho early next year to complete the tunnel.
In a nod to local tradition, the TBM will be given a Sesotho name, becoming part of the project’s legacy. The LHDA has launched a naming competition, which started on August 28, 2024, and is being promoted through various platforms, including social media and local radio stations.
Minister of Natural Resources Mohlomi Moleko lauded the arrival of the TBM as a significant milestone for LHWP II.
“Our Ministry is committed to fostering economic growth, and such initiatives are key to achieving this goal. This project must contribute to improving lives, promoting peace, and ensuring stability. We believe LHDA is ensuring that the project benefits the Basotho people,” he said.
On his part, South African High Commissioner to Lesotho, Constance Seoposengwe, also emphasised the importance of the TBM’s arrival. Despite previous delays, Seoposengwe expressed optimism that the TBM’s presence would accelerate progress.
“The TBM’s efficiency surpasses that of the traditional drill-and-blast method. Every minute counts from now on. Today’s event signals a call to action for all involved to work with urgency and complete the project by 2028, within budget,” Seoposengwe noted.
