State-owned GAIL (India) Ltd will build one of India's largest proton exchange membrane (PEM) electrolyzer at Guna in Madhya Pradesh to produce green hydrogen by the end of 2023, as it looks to supplement ‎its natural gas business with carbon-free fuel. In a statement, India's largest gas transporting and marketing firm said it has awarded the contract to set up the PEM-based project that will produce 4.3 tonnes of green hydrogen per day (about 10 MW capacity), which will be mixed in natural gas for supply to industries.