Historical Critical Contingency Events & Notices
This exercise simulated damage to the First Gas "South" gas transmission pipeline near Hawera in Taranaki. The damage caused a large gas leak and required the transmission system south of Hawera through to Wellington and east through to Hastings to be isolated from supply while repairs were carried out. The estimated time to repair the pipeline was 48 hours. The CCO issued two demand curtailment instructions, firstly to bands 3 and 4, later extended to bands 5 and 6 to ensure that system pressures could be maintained at safe levels until the pipeline repairs were completed.