Election Commissioner Hari Shankar Brahma was on Thursday elevated as the chief election commissioner.
He will assume charge on Friday. Incumbent V S Sampath demitted office on Thursday on attaining the age of 65.
The convention is to appoint the senior-most among the election commissioners as the chief election commissioner.
After Brahma's appointment, government will set in motion the process to appoint an election commissioner to fill a vacancy in the three-member body.
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A 1975-batch IAS officer of Andhra Pradesh cadre, Brahma (64), who hails from Assam, will have a tenure of slightly over three months till April 19 when he turns 65, the upper age limit for the post under the Constitution. Brahma was the Union Power Secretary before his induction into the Election Commission. He assumed charge as one of the three Election Commissioners on August 25, 2010.