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The 'Rebate'

If you install a complete new system, with CEC approved inverters and panels, and have it correctly installed by a CEC accredited electrician, then the installation, on completion, earns a certain number of STCs (Small Technology Certificates). You can also earn STCs by adding more panels to an existing installation, as long as the inverter is still on the CEC approved list. You can take down an existing system that already earned STCs, and replace it with a new system, and earn STCs.


Each STC has a maximum value of $40, they have traded as low as $20, and most of the time trade in the mid $30s. They are just like any stock or share, bought and sold with a price that is determined by supply and demand.


In 2019, a 6.6kW system in Perth earns 109 STCs. In 2018 it was 2018, and in 2020 it will be 100 STCs and the number will continue to drop until 2030 when they are gone entirely. At least that's the current scheme...who knows what is around the corner?


You can calculate how many STCs are earned for any size of system, at any time, anywhere

using the REC Registry calculator.


The STCs belong to YOU. However in almost all cases it is better for you to agree to sell them to your solar retailer who will give you an up-front discount. Most times, solar retailers simply quote you on the basis that you are going to sell the STCs to them.


Feed-In Tariffs refer to what you get paid for surplus power made by your solar during the day that wasn't needed at the time it was made. In Perth it is 7.14 cents per kWh. Synergy call it the Renewable Energy Buyback Scheme (REBS).

7 cents is a fair price when compared to what Synergy pay for a kWh of power from other sources and if those other sources (coal, gas) get more expensive then it is highly likely  that The REBs payment will rise.


A typical 5kW inverter and 6.6kW of panels in Perth produces about 30kWh of power per day,  and almost all of that power is between 9am and 5pm. Unless you have bores, pool pumps and run your A/C during the day, there is not much chance that your house can use up 30kWh between 9am and 5pm, and so, it is exported back to the grid. You give Synergy a unit of power at 2pm and get paid 7 cents for it, and then at 7pm you buy it back from them for 25 cents. No wonder people want battery storage


Financing solar purchases is surprisingly rare in our experience and yet we are really not sure why. Totally legit unsecured Green Energy Loans have interest rates of about 6% and setup fees of $150. The 'Interest free' deals require the retailer to load their prices by $600 or so to cover the fees charged by the financer, so in reality, you ultimately pay less and have much more flexibility going for a green loan from folks like Community First Credit Union. Cheapest way though if you can't pony up the cash is to talk to your bank and try to put it on your mortgage.