Santos closed 3.5% higher after country's No.2 independent gas producer posted a 89% jump in half-year profit, boosted by its acquisition of Quadrant Energy and strong output from its Cooper Basin fields in South Australia.
Origin Energy finished up 2.4% after it reported a 41.6% rise in its annual underlying profit, helped by robust production at its Australia Pacific LNG project.
Retailer Coles Group ended 2% higher as the announcement of a special dividend along with strong online sales overshadowed an annual profit drop. Australia's largest airline Qantas Airways Ltd posted a 1.4% gain in a highly volatile session for the stock as investors cheered its A$400 million ($271.00 million) share buyback announcement, putting behind the disappointing earnings results.
Financials, a major benchmark constituent, gained 0.5% with all the 'Big Four' banks eking out gains.
However, the Metals and Mining index lost 0.4%, pulled down mainly by gold stocks, while diversified mining giants BHP Group posted marginal losses. Miner South32 Ltd closed 4.4% lower after reporting a 25% drop in annual underlying profit.
New Zealand's benchmark S&P/NZX 50 index rose 0.1% to 10,725.22, led by energy retailer Mercury NZ Ltd and adventure goods retailer Kathmandu Holdings Ltd, with more than 3% gains each.