Singh, 51, will be the first person to be appointed to the top job at a Maharatna company through a search committee route.
Government headhunters, Public Enterprise Selection Board (PESB) normally selects board appointees to state-owned firms but in case of NTPC a Search-cum-Selection Committee was constituted after Arup Roy Choudhury was denied an extension of service in August.
The Appointments Committee of the Cabinet (ACC) headed by Prime Minister Narendra Modi has approved the appointment of Singh for a period of five years from the date of assumption of charge of the post, official sources said.
When contacted, Singh told PTI that he will wait for a formal communication from the Ministry of Power before assuming office. "I will have to consult them before joining."
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Among those considered in reckoning for the job were Rural Electrification Corporation Chairman Rajiv Sharma. Others considered in reckoning were Praveer Sinha, the chief executive of Tata Power Delhi Distribution Company, Aman Singh, principal secretary to the Chief Minister of Chattishgarh, and NTPC's finance director K Biswal.
He was appointed as head of India's largest power producer by the UPA government in September 2010 for five years, which was extendable till he attains retirement age of 60 years. He was to achieve the retirement age in December 2016.
After his exit, A K Jha, Director (Technical), NTPC was given additional charge of the post of CMD.
Chowdhury was the second PSU head who was not allowed to continue till retirement after completing a five-year term. Earlier in June, the government had denied extension to C S Verma as head of Maharatna PSU Steel Authority of India Ltd (SAIL).