In which year the Department of Non-Conventional Energy Sources (DNES), under the Ministry of Energy, was upgraded into a separate Ministry of Non-Conventional Energy Sources (MNES)?

1992

The correct answer is Option (3) → 1992

The Department of Non-Conventional Energy Sources (DNES) was upgraded and made a separate Ministry of Non-Conventional Energy Sources (MNES) in 1992.

Later, in 2006, MNES was renamed as the Ministry of New and Renewable Energy (MNRE).