The Eraring ash dam was assessed for its ability to withstand a 1 in 1000 earthquake (approximately equivalent to 5.7 on the Richter scale), which is a requirement of the guidelines developed by the Dam Safety Committee under the Dam Safety Act 1978. While the likelihood of an earthquake of this scale is low, the consequence would be significant.
As part of our ongoing maintenance and monitoring of the Eraring ash dam, late last year Origin commissioned an engineering review of the facility. This review found that while the dam is stable, this could be affected in the event of a major earthquake.
Origin has signed an agreement with GB Energy to purchase all natural gas produced from GB Energy’s Golden Beach field, in the offshore Gippsland Basin. Origin has also entered into a foundation storage contract if GB Energy transitions the reservoir into an underground storage facility after production.