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The Mangdechhu hydroelectric venture in central Bhutan, the nation’s newest hydro plant to return on-line, has introduced a major enhance within the put in energy capability, offering extra power safety nationally in addition to the chance for additional exports to India.
This characteristic article was initially printed in The International Energy & Vitality Elites 2022
The Mangdechhu hydroelectric plant on the Mangdechhu River within the Trongsa district of central Bhutan is taken into account a gamechanger for the mountainous landlocked Himalayan nation.
The 720MW run-of-river venture, which was inaugurated after threemonth commissioning in August 2019, is the nation’s second-largest energy venture thus far and marked an virtually 50% enhance within the put in hydro capability.
On 2,335MW presently, hydro accounts for 99% of the facility era capability, with nearly all of the remainder diesel-powered era.
The venture was conceived in 2010 in a bilateral settlement with the federal government of India, to which Bhutan is a crucial exporter of power – notably within the moist summer time months when the era output far exceeds the native necessities.
With monetary help from the Indian authorities within the type of a mixed grant and mortgage, the venture was accomplished inside seven years from the award of the foremost civil, electromechanical and hydromechanical packages in March 2012.
The concrete dam, the work of Indian conglomerate Jaiprakash Associates Restricted, has a peak of 56m above the river mattress degree and is 141.28m lengthy and with a high width of 10m.
The plant is comprised of a 682m, 8.5m diameter diversion tunnel, 13.56km, 6.5m headrace tunnel and 1.33km, 8m diameter tailrace tunnel.
Different constructions included two 340m lengthy desilting chambers, a 13.5m, 152m deep surge shaft, two 1.86km, 3.5m diameter steel-lined stress shafts, a 155m, 41m deep underground powerhouse cavern and a 135m, 23m deep underground transformer cavern.
Different key contractors have been Gammon India Restricted/Gammon Engineers & Contractors, PES Engineers and Kalpataru India from India, Alstom/GE T&D, and Hyosung Company and L S Cable from South Korea.
The 4 hydro generators are Pelton wheel generators, every rated for a head of 692m and 180MW capability.
The design output is 2,925MWh primarily based on 95% machine availability. Energy evacuation is by way of a 400kV double line transmission hall by way of Jigmeling in southern Bhutan to Alipurdwar in West Bengal.
Along with the quick venture execution timeframe, one other key standout is its value, which is estimated to whole round Rs.5110 crores ($700.69 million). This corresponds to a price per megawatt of round Rs.7.1 crores ($0.97 million).
“The Mangdechhu plant is an exemplary venture,” says AK Mishra, Managing Director of the Mangdechhu Hydroelectric Mission Authority, which was based to handle its improvement.
“That is probably the most economical venture for value and time when put next with the modern hydropower initiatives of comparable measurement and capability within the South Asian cooperation area.”
The venture was recognised for “excellent civil engineering works” with the award of the Brunel Medal – named after the Nineteenth-century engineering large Isambard Kingdom Brunel – from the UK Establishment of Civil Engineers in October 2020.
Amongst different notable options was the creation of 500 new jobs for engineers and help workers regionally, benefitting affected households amongst others.
The venture has additionally supported varied colleges and well being services with the upgrading of infrastructure and has offered ingesting water and water irrigation services.
Mishra feedback that varied challenges have been encountered, notably across the technical complexities of the venture with placements, and non-shifting of underground constructions in a low dipping shear zone, in addition to on contractual points and coordination and implementation.
“These concerned out of the field pondering from the venture administration aspect and we launched new applied sciences and building strategies to expedite the excavation and concreting works.”
Learn the complete venture characteristic right here
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