"We require eight million cubic metres for overall expansion which is almost half the gas available at Panna-Mukta-Tapi. At present, for the 655 mw, we are using three million cubic metres a day," said Rajiv Mishra, managing director of CLP Power India, which is a 100 per cent subsidiary of the Hong Kong-based CLP Group. The company had received the required environment clearance from the Gujarat Pollution Control Board in 2007.