In 2010 the Authority carried out a general review of its advisory groups. This led to the Authority's decision to establish three new standing advisory groups - the Retail Advisory Group, the Transmission Advisory Group, and the Wholesale Advisory Group. Consequently, the Investment Advisory Group was disestablished.

The members of the Investment Advisory Group were:

  • Bill Heaps (Chair)
  • Richard Pearce (Genesis)
  • Ray Brown (Meridian)
  • Peter Calderwood (Trustpower)
  • Duncan Head (Vector)
  • Glen Coates (Orion)
  • Stephen Lewis (Independent)
  • Michael Whaley (Powerco)
  • Graeme Ancell (Transpower)
  • Ray Deacon (New Zealand Aluminium Services)
  • Fraser Clark (New Zealand Wind Energy Association)

Prior to 31 October 2010 the IAG was administered by the Electricity Commission.