Agartala: ONGC-Tripura Power Corporation (OTPC)’s 724-MW gas-based thermal power project at Palatana in South Tripura district would start generation by June, a top official of state-owned oil major ONGC said on Tuesday. The first phase of the project would be operational by June, ONGC Chairman and Managing Director Sudhir Basudeva, who reviewed the progress of work at the project with OTPC officials on Monday, told reporters here.