Projects | Right: Aerial view of the project
j maintain a safe egress from the power station in the event of a fire situation anywhere in the underground tunnel and cavern system,” says Ken Dean, Senior Mechanical Engineer – Hydropower, who worked as Chief Resident Engineer on the project.
Sharing learnings with the industry Commissioned in 2016, the Ulu Jelai Hydroelectric
Project has achieved its goal to provide peaking power and spinning reserve for frequency control of the national grid. Local communities also benefitted commercially through road infrastructure improvements and some residents gaining employment opportunities for ongoing operation and maintenance activities for the dam and power station. Many learnings can be applied from this project
to other schemes, with one example being effective sedimentation management. The potential for sedimentation within the Susu reservoir was
Table 1: Project features Height Dam
Diversion Tunnels
Power Waterway
Crest Width Crest Length Spillway Telom Lemoi
Roller compacted concrete 90m 5m
515m
Integral, stepped into stilling basin at dam toe. 3m, 8520m long 3m, 7430m long
Headrace Tunnel 8.9m, 4198m long, unlined horseshoe tunnel Power Shaft Power Tunnel
Power Station
Penstock Tunnel Tailrace Tunnel Machine Hall
5.4m to 17m, 380m tall, plain concrete lined 2.6m, 77m long, concrete lined 1.9m, 91m long, steel lined
7.7m, 1700m long, concrete lined, horseshoe 22.5m wide, 78.6m long, 50.2m tall.
Transformer Hall 17.4m wide, 40m long, 22.5m tall Main Access Tunnel 8.6m, 640m long Francis
Turbine
Electrical and
Mechanical Generator 2 × 191MW 321.0 Rated Head
3-Phase Synchronous Generator 219 MVA 50 Hz
22 | October 2021 |
www.waterpowermagazine.com
identified early as a serious concern to the longevity of the project, especially considering the ongoing sedimentation issues in other hydropower schemes in the Cameron Highlands. “We studied several options and eventually adopted sediment flushing as the most effective method for sedimentation management,” explains Dilwyn Jones. “This led to the installation of twin flushing outlets in the diversion conduits. A check dam was also constructed upstream of the reservoir in an effort to trap sand and gravel, allowing only fine silt to enter the reservoir.”
“It has been really exciting for me and my team to apply everything we have learnt working on the Ulu Jelai Hydroelectric Project, and other international hydropower projects, to support the resurgence of hydropower development in Australia,” says Luke Drowley. “This global experience has enabled us to provide industry leading services to the Snowy 2.0 project and other potential hydropower projects across Australia.” “SMEC’s vast experience as a consulting specialist on hydropower projects, along with their involvement in the pre-feasibility works, made them an ideal partner for this project,” says Dato’ Nor Azman Mufti. “We have had a long history of partnering together on Malaysian hydroelectric development.”
Energising the future As Malaysia’s Electrical Power Public Utility, TNB
aspires to be a leading provider of sustainable energy solutions in Malaysia and internationally. “Decarbonisation is our vision for betterment of the world, in line with our pledge on the TNB Sustainability Pathway, which is guided by the United Nations Sustainable Development Goals (SDGs) and Environmental and Social Governance (ESG),” says Dato’ Nor Azman Mufti. “The Ulu Jelai Hydroelectric Project contributes to ensuring that electricity is secure, affordable and accessible to our more than nine million customers, which has significant economic impact. It is also a testimony of our ambitious journey towards greener and more sustainable sources of energy. Congratulations to all stakeholders and everyone involved in delivering this remarkable project.” ●
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