Exhibit 99.1 Woodside Energy Group Ltd ACN 004 898 962 Mia Yellagonga 11 Mount Street Perth WA 6000 Australia T +61 8 9348 4000 www.woodside.com ASX: WDS NYSE: WDS LSE: WDS Announcement Tuesday, 22 August 2023 HALF-YEAR REPORT FOR PERIOD ENDED 30 JUNE 2023 Safety performance • There was a fatality in June 2023 at the North Rankin Complex. Woodside’s investigation is ongoing. Immediate actions have been implemented and preliminary lessons shared with industry Financial highlights for H1 2023 • Record H1 net ...