On 29 April 2011 the AER provided its final determination on SP AusNet’s AMI Revised Budget Application for 2009-11. The AER has since identified errors in the final determination and has issued a corrigendum which specifies the corrected figures. These corrected figures result in a -$14.46 million reduction to SP AusNet's Approved Budget for 2009-11 and not a -$4.63 million reduction as incorrectly specified in the final determination previously.

On 20 July 2011, the AER revoked its final determination on SP AusNet’s 2009-11 AMI Revised Budget Application which was made on 29 April 2011. The revoked determination was replaced by a new final determination. The new final determination results in a net decrease of $1.263m ($2008) reduction in SP AusNet’s Approved Budget for 2009-11.