Tengeh Reservoir, Singapore

Tengeh Reservoir is a coastal freshwater reservoir located in the western part of Singapore, within the Tuas region. It was created by the construction of the Tengeh Dam and serves as an important component of Singapore’s water catchment system. In recent years, it has gained international attention as the site of one of the world’s largest floating solar farms, demonstrating Singapore’s innovative approach to sustainable energy and water management.

Quick Facts

Geography and Hydrology

Tengeh Reservoir is located near the western tip of Singapore, adjacent to Tuas Bay and close to the Straits of Johor. It forms part of the Western Catchment Area, which also includes the Poyan Reservoir and Murai Reservoir1. The reservoir receives inflow from local streams, including Sungei Tengeh, and is separated from the sea by the Tengeh Dam, which prevents seawater intrusion while allowing for the collection of rainwater.

The reservoir’s catchment area lies mostly within restricted zones used by the Singapore Armed Forces, ensuring limited urban runoff and maintaining high water quality. It is part of the integrated water catchment strategy designed by the Public Utilities Board (PUB) to maximise local rainwater collection for the nation’s water needs.

History and Development

The creation of Tengeh Reservoir was part of Singapore’s broader effort during the 1970s and 1980s to expand its network of reservoirs to achieve self-sufficiency in water supply. The Tengeh Dam was constructed to enclose the western coastal region, forming a freshwater body suitable for stormwater and rainwater collection2. This approach mirrored similar projects such as the Kranji Reservoir and Pandan Reservoir.

Originally serving primarily as a water storage and flood control site, Tengeh Reservoir later became a symbol of Singapore’s drive toward renewable energy. In 2021, the reservoir was transformed by the installation of a massive floating solar photovoltaic (PV) system spanning 45 hectares — roughly the size of 45 football fields3. This development made it one of the largest inland floating solar farms in the world.

Floating Solar Farm

Commissioned in 2021, the Tengeh Reservoir floating solar farm represents a major step in Singapore’s transition toward clean energy. The project was developed by Sembcorp Industries in partnership with the Public Utilities Board (PUB). It features more than 120,000 solar panels generating 60 megawatt-peak (MWp) of electricity, which is sufficient to power PUB’s five local water treatment plants4.

The use of floating solar panels reduces land use, minimises evaporation from the reservoir, and provides shading that helps to maintain cooler water temperatures. This innovative dual-use of space — for both water and power generation — reflects Singapore’s commitment to sustainability and efficient resource management.

Environmental Management

The integration of a large solar installation into a water catchment required detailed environmental planning. PUB and Sembcorp carried out extensive environmental studies to ensure that aquatic ecosystems were not adversely affected5. The panels are designed to allow light penetration and maintain oxygen levels in the water, preventing negative impacts on aquatic flora and fauna.

The reservoir continues to serve its original purpose as a water body for stormwater control and freshwater collection. Its water quality is regularly monitored by PUB, ensuring that it meets the stringent standards required for Singapore’s water catchment areas. The presence of the solar farm does not interfere with the reservoir’s hydrological functions.

Access and Surroundings

Tengeh Reservoir is not open to the public due to its location within a restricted zone in Tuas. The area surrounding the reservoir is primarily industrial, with limited residential or recreational development. The reservoir can be viewed from certain elevated locations nearby, but general entry is prohibited to protect both national security interests and water quality6.

Nearby landmarks include the Tuas Checkpoint and the Malaysia–Singapore Second Link, which lies just west of the reservoir. The proximity to these transport infrastructures highlights the reservoir’s strategic location near the Singapore–Malaysia border.

Significance and Legacy

Tengeh Reservoir represents a convergence of Singapore’s two national priorities: water security and clean energy. By combining freshwater storage with large-scale solar energy generation, it serves as a model for sustainable infrastructure that other nations have studied and emulated7.

The success of the floating solar project has inspired similar initiatives at other reservoirs across the country, including the Bedok Reservoir and Upper Seletar Reservoir. Collectively, these projects strengthen Singapore’s position as a global leader in integrated water and energy management.

Conclusion

Tengeh Reservoir stands as one of Singapore’s most innovative and forward-looking water bodies. Beyond its functional role in flood control and water storage, it has become a symbol of sustainable progress, showcasing how technology and environmental stewardship can coexist harmoniously. Its vast floating solar array not only powers critical water infrastructure but also reinforces Singapore’s vision of a resilient and sustainable future.

Tengeh Reservoir is on the Map of Reservoirs in Singapore

References

  1. Public Utilities Board (PUB) – Local Catchment Water
  2. Singapore Infopedia – Tengeh Reservoir
  3. Sembcorp – Tengeh Floating Solar Farm Launch
  4. CNA – PUB and Sembcorp Open Singapore’s First Large-Scale Floating Solar Farm
  5. The Straits Times – Floating Solar Farm at Tengeh Reservoir
  6. Singapore OneMap – Tuas and Western Catchment Area
  7. PUB – Water Management in Singapore

Page Details

This page was created on 5 October 2025. Hi, my name is Timothy and created it from my research, for my own entertainment, knowledge and to satisfy my curiosity. I am providing the information to you in good faith and hope it is useful. I try to get the details as accurate as possible. I also try to update the page whenever I stumble on new details. So this and all my other pages are perpetual work in progress. If you discover any error, please politely inform me, pointing out where the error lies, and I will correct it as soon as possible. Your helpfulness will keep this page accurate, relevant and helpful to those who need the information.

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