| 25/06/2008 | ACCC commenced review under the Merger Review Process Guidelines. |
| 11/07/2008 | Closing date for submissions from interested parties. |
| 11/08/2008 | ACCC requested further information from BG Group. ACCC timeline suspended. |
| 19/08/2008 | Draft 87B undertaking proffered by BG. ACCC commenced market inquiries. Timeline recommenced. |
| 19/08/2008 | Former proposed date for announcement of ACCC's findings, amended to allow for public consultation on draft 87B undertakings. |
| 26/08/2008 | Closing date for submissions relating to draft 87B undertaking. |
| 10/09/2008 | In light of BG's announcement of 9 September 2008, the ACCC does not expect to make a decision on the proposed acquisition. The ACCC will suspend the timeline pending the expiry of BG's offer period on 26 September 2008. |
| 26/09/2008 | BG announced that its offer for Origin Energy has lapsed with conditions unfulfilled. ACCC review discontinued. |
