The Batang Ai Dam (Malay: Empangan Batang Ai) is a concrete-face rock-fill dam in Batang Ai National Park in Sarawak, Malaysia. The power station comprises four 25 MW turbines, totalling the installed capacity to 100 MW. The station is operated by Sarawak Electricity Supply Corporation. Preparations for the dam began in 1975, before the design was published in 1977. Construction started in 1982 with the river diversion work and the last turbine completed in 1985. The Batang Ai project, a relatively modest dam financed by the Asian Development Bank, caused the displacement of approximately 3,000 people from 26 longhouses. These people have since been accommodated in the Batang Ai Resettlement Scheme to cultivate cocoa and rubber but the programme has not been successful.

Quick Facts Coordinates, Construction began ...

Batang Ai Dam
Scenery of water catchment area of Batang Ai Dam
Location of Batang Ai Dam in Malaysia
Coordinates	01°08′50″N 111°52′26″E
Construction began	1982
Opening date	1985
Dam and spillways
Impounds	Batang Ai River
Height	85 m (279 ft)
Length	810 m (2,660 ft)
Spillway capacity	2,438 m3/s (86,097 cu ft/s)
Reservoir
Creates	Batang Ai Reservoir
Total capacity	2,870,000,000 m3 (2,326,747 acre⋅ft)
Inactive capacity	1,630,000,000 m3 (1,321,463 acre⋅ft)[1]
Catchment area	1,200 km2 (460 sq mi)
Surface area	85 km2 (33 sq mi)
Power Station
Operator(s)	Sarawak Energy
Turbines	4 × 25 MW Francis-type[2]
Installed capacity	100 MW

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• National Grid, Malaysia