The transition took place on 1 May 2008 when Part J of the Rules came into effect.

The Electricity Commission Board considered the undesirable trading situation claim made by TrustPower on 14 August 2008.  It found that while the issue raised by TrustPower was a serious one, the circumstances giving rise to the undesirable trading situation claim by TrustPower did not meet the regulatory requirements for an undesirable trading situation.