A technical report confirms that a rupture of the Maui gas pipeline in October last year was caused by a landslip.
The outage lasted for five days and deprived many industries of gas for energy for factory production.
The accident happened in the Pukearuhe region of inland Taranaki.
A report into the accident was commissioned by the owners of the pipeline, Maui Development Ltd.
It says a section of the 307km-long pipeline failed due to sudden overload caused by landslide movement.
There was no problem with the strength of the pipe itself.
