The acceleration of Phase II of the Lesotho Highlands Water Project (LHWP), marked by the launch of the second Tunnel Boring Machine (TBM) at the Polihali site, represents far more than another infrastructure milestone. It signals a defining moment in Africa’s pursuit of regional integration, water security, energy cooperation, and long term economic resilience.
At a time when climate pressures, urban expansion, industrial demand, and population growth are reshaping resource management across the continent, this transboundary initiative offers a practical model for how neighbouring African countries can jointly finance, govern, and execute infrastructure projects that deliver lasting economic value.
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For both Lesotho and South Africa, the project has evolved beyond a simple water transfer scheme into a strategic undertaking that supports economic continuity, strengthens industrial productivity, enhances energy security, expands engineering capacity, and demonstrates how regional cooperation can move from aspiration to practical implementation.
The LHWP is one of Africa’s largest and most sophisticated cross border infrastructure programmes. Established through a treaty between Lesotho and South Africa, it harnesses Lesotho’s high altitude water resources and channels them into South Africa’s industrial heartland while generating hydroelectric power for Lesotho.
Phase II significantly expands this vision through the 38.5 kilometre Polihali Transfer Tunnel, which will transport water from the new Polihali Reservoir to the existing Katse Reservoir using gravity fed engineering. This approach eliminates the need for energy intensive pumping and improves long term operational efficiency. Once completed, annual transfer capacity is expected to increase from approximately 780 million cubic metres to 1.27 billion cubic metres.
This expansion is particularly important for Gauteng Province, South Africa’s smallest province by area but its largest economic hub. Home to Johannesburg, Pretoria, and major industrial corridors, Gauteng depends heavily on a reliable water supply to sustain manufacturing, mining, financial services, and urban development activities that contribute substantially to the country’s GDP.
The launch of the second TBM, a 423 metre long underground excavation system named “Leboborane la Manyokola Thita,” meaning “the insect that bores through hard surfaces,” marks a significant engineering achievement. With one TBM already operating from the Katse side since early 2025 and the second advancing from the Polihali side, excavation is now progressing simultaneously from both ends of the tunnel.
This dual boring strategy allows work to continue through challenging mountainous terrain where rock cover exceeds 1,000 metres in some sections. It is expected to accelerate construction timelines and improve confidence in meeting the targeted 2029 water delivery schedule. Equally important, it reduces project execution risks that could increase financing costs, disrupt procurement plans, and delay economic benefits for both countries.
Water security has become one of Southern Africa’s most pressing economic challenges. Rapid urbanisation, industrial expansion, climate variability, recurring droughts, ageing municipal systems, and population growth continue to place increasing pressure on available resources.
These pressures are especially evident in Gauteng, where local water resources are insufficient to support the scale of economic activity. As a result, the province relies heavily on inter basin transfer systems such as the LHWP, which effectively serve as strategic economic safeguards. The project highlights an important reality: water infrastructure is not merely a public utility service but a foundational economic asset comparable to ports, power grids, and transport corridors.
While South Africa benefits from greater water security, Lesotho gains an equally important set of advantages that strengthen its role as a regional infrastructure partner. More than 2,400 Basotho workers are currently employed on the project, while over 1,100 individuals have received technical training and certification.
In addition, local procurement spending exceeding 600 million Maloti demonstrates how major infrastructure investment can stimulate domestic business growth. These efforts help ensure that valuable engineering and technical expertise remains within the country long after construction is completed, supporting employment, skills development, industrial growth, and greater fiscal resilience.
Phase II also advances Lesotho’s energy ambitions through the planned Oxbow Hydropower Scheme and expanded generation capacity linked to the Muela Hydropower Station. As a result, the project serves as a dual purpose platform supporting both water and energy security.
This energy component is increasingly important as power instability continues to constrain manufacturing, digital infrastructure, healthcare, mining, and urban productivity across Africa. Expanded hydropower generation will reduce Lesotho’s dependence on imported electricity while creating opportunities for industrial development, investment attraction, energy sovereignty, and regional electricity trade.
Once completed, the Polihali Dam will become Africa’s largest concrete faced rockfill dam. Combined with its advanced tunnelling systems, the project challenges outdated perceptions about Africa’s infrastructure capabilities and contributes to the development of a stronger engineering ecosystem capable of supporting future ambitions in water, energy, transportation, and telecommunications.
Beyond its engineering significance, the LHWP demonstrates regional integration through action rather than rhetoric. The project is built on legally binding agreements, shared financing arrangements, joint governance structures, and mutually beneficial outcomes. These elements provide valuable lessons for future cooperation in regional rail systems, power pools, gas pipelines, digital infrastructure, and water basin management.
As Africa advances integration efforts under frameworks such as the African Continental Free Trade Area, infrastructure collaboration becomes increasingly important. Trade integration cannot succeed without the physical systems needed to move people, goods, services, energy, and information efficiently across borders.
The project’s relevance is further strengthened by climate change, which is altering hydrological systems around the world. Southern Africa is experiencing increasingly unpredictable rainfall patterns, prolonged droughts, and greater weather variability, making long term water storage and transfer infrastructure essential climate adaptation assets.
Ultimately, the acceleration of the Lesotho Highlands Water Project reflects a broader shift in Africa’s development strategy. It underscores a growing emphasis on long term resilience over short term solutions, regional collaboration over isolated national approaches, and strategic resource management over reactive crisis responses.
For South Africa, the project safeguards the water resources that underpin its economic engine. For Lesotho, it accelerates industrial participation, energy development, and economic transformation. For Africa as a whole, it demonstrates that ambitious regional infrastructure projects can succeed when political commitment, engineering expertise, and long term economic planning align.
The significance of the LHWP extends far beyond tunnels and dams. It represents a growing recognition that Africa’s future prosperity will depend not only on the infrastructure it builds today but also on the regional partnerships that sustain and maximise its value for generations to come.
