Ann: Origin Energy 2024 Investor Briefing, page-6

So if Macquarie is predicting a full year FY24 div of 57.5cps, then that means that Sept24 div would be 30cps (as first half div in March was 27.5cps ff) , which compares well with Sept23 div of 20cps.
And we know from CEO statements that there are plenty of franking credits, so it will be FF.
A final div of 30c FF would be nice of course, and being 50% greater than pcp would look good and show faith with the shareholders who kept the company whole and Australian.

I do wonder whether (if profits would allow it, and if it doesn't compromise ORG investments in renewables etc) the Board might pay a little higher (perhaps including a small special div) - with the unstated purpose being to support a higher sp (ie above $11 or so), rewarding shareholder faith, demonstrating (for credibility reasons) that the Board and CEO DO want to manage the company for the LONG-TERM benefit of shareholders, and push ORG further out of possible takeover range.

...only a couple of months before I find out!
GLT(long-term)H