** Shares of APA Group APA.AX are up as much as 2.8% at A$9.4, their biggest intraday pct gain since Aug 20** Energy infrastructure co to divest 20% stake in Allgas Network** Co's share of the proceeds from sale estimated to be A$64 million ($42.23 million)** Shares hit highest level since Nov 25** YTD, shares up 33.8%

($1 = 1.5156 Australian dollars)

(Reporting by Nichiket Sunil in Bengaluru)

((Nichiket.Sunil@thomsonreuters.com))