Dun & Bradstreet PSU Awards 2018 Sector Winners 2018 Coal Coal India Limited Crude Oil Oil and Natural Gas Corporation Limited Power Generation NTPC Limited Power Transmission Power Grid Corporation of India Limited Fertilizers National Fertilizers Limited Gas - Processing, Transmission and Marketing GAIL (India) Limited Heavy & Medium Engineering Hindustan Aeronautics Limited Petroleum - Refining & Marketing Indian Oil Corporation Limited Minerals & Metals NMDC Limited Indian Railway Catering and Tourism Hotel & Tourist Services Corporation Limited Transport & Logistic Services Container Corporation of India Limited Contract, Construction & Technical Consultancy Services NBCC (India) Limited Financial Services Rural Electrification Corporation Limited Life Insurance Life Insurance Corporation of India Non-Life Insurance The New India Assurance Company Limited Re-insurance General Insurance Corporation of India Best Growth Performance - Contract, Construction & PFC Consulting Limited Technical Consultancy Services Best Growth Performance - Financial Services Indian Railway Finance Corporation Limited Best Growth Performance - Power Generation NLC India Limited Best Maharatna in Manufacturing, Processing and Generation Indian Oil Corporation Limited Best Navratna in Manufacturing, Processing and Generation Hindustan Petroleum Corporation Limited Best Miniratna in Manufacturing, Processing and Generation Numaligarh Refinery Limited Best Navratna in Services Power Grid Corporation of India Limited Best Miniratna in Services Rail Vikas Nigam Limited Best Maharatna in Mining & Exploration Oil and Natural Gas Corporation Limited Best Navratna in Mining & Exploration NMDC Limited Best Miniratna in Mining & Exploration South Eastern Coalfields Limited Overall Best Maharatna Indian Oil Corporation Limited Overall Best Navratna Power Grid Corporation of India Limited Overall Best Miniratna Numaligarh Refinery Limited Best Corporate Social Responsibility Initiatives Oil and Natural Gas Corporation Limited Best Export Performance National Aluminium Company Limited Best Swachh Bharat Initiatives Oil and Natural Gas Corporation Limited.