I'm already with Origin and have solar. I was looking to move my gas as well, and I stumbled on this offer. I'm not sure when this offer expires.
It is for online applications only. It states "$150 electricity credit applied after 15 Jan 2024 if this plan is still active." The rates are pretty good. No lock-in contract.
Even though the FiT is low, because you only need to stay on this plan for a short time, it is still worthwhile. Comparing to their best solar plan, you lose out out on (0.16-0.07) cents/kwh (difference between standard and boosted FiT) * 14 kwh (Boost limited to first 14kwh) * 60 (only need to stay until 15th Jan) = * 14 kwh * 60 = $75. So you're better off overall collecting $150 credit. Moreover, you also get lower supply and usage charges than the solar plan.
Takes about 2 minutes to apply. Just remember to move again after 15th Jan.
They've cottoned on to the above and have also moved the payout to mid Jan.