State-run Oil and Natural Gas Corp (ONGC) on Monday said it has reconfigured its proposed mega petrochemical plant at Dahej in Gujarat, bringing down the cost by Rs 1,100 crore to Rs 12,440 crore. The board of directors of ONGC, which met here on Monday, approved the revised configuration of Dahej Petrochemicals Project being implemented by the company's subsidiary ONGC Petro-additions Ltd (OPAL). The project was initially configured with a styrene butadiene rubber (SBR)