Oil regulator PNGRB has added Mizoram to the areas it has offered for bidding for a licence to retail CNG and piped cooking gas in the latest city gas bid round. In a notice, the Petroleum and Natural Gas Regulatory Board (PNGRB) said in continuation of the bids invited on October 13 for the development of the city gas distribution network for seven geographical areas, electronic bids are invited for the same in the state of Mizoram.