This was stated by Shri Piyush Goyal, Minister of State IC for Power, Coal  New and Renewable Energy and Mines in a written reply to a question in the Lok Sabha today
अशी माहिती ऊर्जा आणि कोळसा खात्याचे मंत्री पियुष गोयल यांनी आज लोकसभेत एका प्रश्नाच्या लेखी उत्तरात दिली