June 1 (Reuters) - APA Group APA.AX
* buys the Orbost gas processing plant
* Total cost of upgrade project, including acquisition costs, is expected to be in order of $270 million
* entered into agreements with cooper energy to purchase, upgrade and operate orbost gas processing plant
* transaction remains subject to cooper energy completing a debt raising and making a final investment decision on sole gas project Source text for Eikon: ID:nASX7TMpLq Further company coverage: APA.AX