The appointment is with immediate effect for the period up to March 31, 2017, says a company press release.
Sethi, a B Tech from IIT Kharagpur, was Chief - Corporate Operations Management and Executive Director of Maithon Power Limited, a subsidiary of Tata Power.
He has experience in power sector ranging from Thermal & Hydro Generation, Transmission & Distribution, Commercial & Regulatory and also Advocacy, it said.