Reliance Industries Ltd announced a Rs 75,000 crore investment in new energy business over the next three years on Thursday, as the operator of the world's largest oil refinery shifts to a greener and cleaner version. As part of the business, Reliance would construct solar manufacturing units, a battery factory for energy storage, a fuel cell manufacturing facility, and an electrolyzer unit to make green hydrogen said Chairman Mukesh Ambani at the company's annual general meeting with shareholders on Thursday.