Australia’s Origin Energy Ltd (ASX:ORG) said it will acquire Caltex New Zealand’s 50% interest in Rockgas Ltd, the largest distributor of LPG in New Zealand. The acquisition would provide Origin with full control of Rockgas, which has an annual turnover of NZ$80 million (US$1=NZ$1.5). Under the agreement, Origin will continue to supply Caltex with LPG…