Oil and Natural Gas Corporation's (ONGC) delayed Krishna Godavari basin KG-D5 project is likely to start crude oil production in May this year and gas output a year later, a senior company official said. ONGC was originally to start gas production from Cluster-II fields in block KG-DWN-98/2 (KG-D5) in June 2019 and the first oil was to flow in March 2020.