The Indian equities benchmark opened lower on Thursday as indicated by the SGX index. At 9:18 am, the BSE Sensex was down 299 points or 0.55 at 54,602, whereas the Nifty 50 index plunged 99 points or 0.61 per cent at 16,256 even as the key repo rate was hiked by 50 basis points to 4.9 per cent to tame inflation.