We actually have quite a few:
For Victorian Gas, our ABN is: Origin Energy (Vic) Pty Limited ABN 11 086 013 283
For QLD, NSW, ACT Gas our ABN is: Origin Energy LPG Limited ABN 77 000 508 369
For electricity, our ABN is: Origin Energy Electricity Limited ABN 33 071 052 287
Origin Energy Retail Limited ABN 22 078 868 425
OC Energy Pty Limited ABN 62 144 655 514
Sun Retail Pty Limited ABN 97 078 848 549