Agree that is quite probable.
May be a bit less for the retail business. Alinta Retail was to bring in 131m or so for 2009 (the Alinta acquisition also brought in other power generating assets). Using a 10x multiple would bring in $1.31b.
Would leave EBITDA of approx $210-$220m p.a. and net debt of around $1.8-$1.9b (with no immediate maturity concerns on debt).