On 27 August 2014, Allgas submitted a negative cost pass through application to the AER to return costs to customers following the repeal of the carbon tax on 17 July 2014. 

On 15 May 2015, Allgas submitted a revised negative cost pass through application.

The application proposed removing the carbon tax component from its approved reference tariffs for the 2015-16 regulatory year, resulting in a negative pass through amount of $1,234,139. It also proposed returning $259,475 in previously over-recovered carbon tax revenues to customers.