Both AGL and Energy Australia exclude solar customers from receiving their higher rate of discounts available to everyone else.
An example of this:
http://www.agl.com.au/residential/energy-plans/electricity-a…
At the bottom is a link for solar customers that takes you to the different plans with more expensive pricing.
On what basis are they allowed to do this considering one makes an intial financial investment with associated risks while providing energy through an environmentally friendly way.
This has been the case for many years now. A normal non solar household can get between 10~18 percent usage discount with AGL but with solar you can probably negotiate around 7-10% at most.