"Ministry of Power vide its order dated September 23, 2015 has appointed K M Singh as Chairman & Managing Director of the company w.E.F. September 23, 2015," NHPC said in a regulatory filing.
"Accordingly, R S T Sai ceased to be Chairman & Managing Director of the Company with immediate effect," it said.
Prior to his appointment as the CMD of NHPC, Singh was the Chief Executive Director of NHDC, a joint venture firm of NHPC and state government of Madhya Pradesh.
Singh was recommended by Public Enterprises Selection Board (PESB) from a list of 12 contenders who were interviewed during the selection process, according to information on PESB website.
NHPC had been unable to fill the post of CMD which has been vacant since January 2011, with additional charge being handled by several incumbents over a period of time.
Singh has a career spanning approximately 29 years in the power sector. He joined NHPC on May 22, 1979.