Residents in the Klang Valley are preparing themselves for a six-day water interruption starting on Monday. Meanwhile, Tenaga Nasional Berhad (TNB) maintains that the maintenance works at the Bukit Badong substation has to be carried out on schedule. The Bukit Badong substation supplies electricity to the Sungai Selangor water treatment plants, which would need to cease operations throughout the duration of the work between Dec 19 and 24.