From what I understand of the legislation in most states you have to actually be living in the property to claim the feed in tariff making this not really viable.
Even if you keep the bill in your name if you are found out for living elsewhere you could get in some serious trouble and be required to pay your tariff back since the states are offering the tariffs as an incentive to people to bring down power use in their ppor.
At best you can hope to get a higher rental rate in the same way other luxuries such as aircon, dishwasher etc attract a higher rent but I would not count on it being enough to justify the cost of installing
Not true at least in the ACT.
The purpose of offering higher tariff rates is to provide incentives for "householders", "businesses", "public and private" or "all electricity customers" excepting non-educational government institutions, and definitely not limited to just owner-resident, to install solar systems and hence help the state achieve its target of kWs electrical power produced by greener electrical systems.
Read: http://www.environment.act.gov.au/__data/assets/pdf_file/0005/144608/FiTFactSheet.pdf
Some extracts: "The ACT electricity feed-in tariff scheme rewards households and businesses that install renewable energy generation technology." "The Scheme is available to all ACT electricity customers (except non-educational Government agencies) with generation facilities of no greater capacity than 30kW. All schools and educational institutions, both public and private, are eligible to access the Scheme. If you are renting, you will need the permission of the property owner before you can install renewable generation equipment."
In fact in the ACT the rewards for installing solar systems are in two subcategories: residential and commercial. The target allocation of installed kW for residential solar systems has been fully subscribed and closed to new comers. The commercial system may still be opened.