India has revved up plans to bolster its emergency crude buffer after recent geopolitical shocks exposed risks to oil supply routes. State-owned Oil And Natural Gas Corporation (ONGC) has approved a 1.75-million-tonne strategic petroleum reserve at Mangaluru, adding nearly 13 million barrels of storage. ONGC said in a stock exchange filing that the project will be developed as a Phase-I extension of the Mangaluru strategic petroleum reserve, along with associated facilities.