I have lost count of how many times I have heard an installer, a salesperson, and a customer all sit at the same kitchen table calling the same thing a “rebate”. The system price drops by a few thousand dollars, everyone nods, and the job gets signed. Nobody in the room actually knows what just happened.
That is fine for the customer. It is not fine for you, the operator. Because the thing you keep calling a rebate is a tradeable financial certificate with a price that moves, paperwork that has to be lodged correctly, and a settlement timeline that can quietly strangle your working capital if you treat it like free government money landing in your account.
I have spent two decades on the supply and admin side of this trade. I have traded these certificates, lived through the shift from RECs to STCs, and watched good install businesses leave real margin on the table because they never bothered to understand the mechanism underneath the discount. So let me walk you through what is actually going on, in plain English, operator to operator.
Where the word “rebate” leads you wrong
A rebate is a fixed amount of money, usually from a government, that comes back to a buyer after a purchase. It does not move. It does not need a market to exist. You could write it on a quote six months out and it would still be correct on the day.
Small-scale Technology Certificates (STCs) are none of those things. They are created under the Small-scale Renewable Energy Scheme, which sits inside the federal Renewable Energy Target, and they are bought and sold like any other commodity (Clean Energy Regulator, n.d.). The word “rebate” hides every part of that sentence that matters to your business: the market, the price movement, and the fact that someone has to buy them off you.
When you call it a rebate, you train yourself to stop thinking about it. That is the expensive habit.
What an STC actually is
An STC is a certificate created from the deemed generation of an eligible small-scale system. Eligible systems include rooftop solar PV, solar water heaters, and heat pumps (Clean Energy Regulator, n.d.).
The key word there is “deemed”. The number of certificates a system creates is not based on what the panels actually push out over a metered period. It is based on a deeming calculation: roughly, the megawatt-hours the system is expected to generate over its deeming period, with one STC broadly equal to one megawatt-hour of that deemed generation (Clean Energy Regulator, n.d.). The deeming period is the number of years left until the scheme winds down, which is why the number of certificates a given system creates has stepped down over the years and will keep doing so.
So a certificate is not a payment. It is a unit, created on paper, that represents expected clean generation. It only turns into dollars when someone buys it.
Who buys your customers’ certificates, and why
Here is the part most people in the kitchen never hear. The certificates have value because the law forces certain businesses to buy them.
Under the Renewable Energy Target, liable entities, principally electricity retailers, carry a legal obligation to surrender a set number of certificates to the Clean Energy Regulator each year (Clean Energy Regulator, n.d.; Australian Government, 2000). They cannot opt out. To meet that obligation, they buy STCs that have been created by systems like the ones you install.
Be precise about this when you explain it, because precision is what makes you sound like you know the trade. The buyers are liable entities under the Renewable Energy Target, not “carbon polluters” and not “the government”. The government runs the scheme and the regulator administers it, but the cash that lands in your pocket comes from a retailer meeting a compliance obligation. That distinction is the whole reason the thing is a market and not a handout.
The assignment: why it feels like a rebate
So how does a number on a compliance ledger become a discount on a homeowner’s quote?
The system owner, your customer, has the right to create the STCs from their system. In almost every residential job, the customer assigns that right to the installer or the retailer in exchange for an up-front, point-of-sale discount (Clean Energy Regulator, n.d.). You take on the certificates, you handle the creation and the trade, and they get money off the sticker price on the day.
That assignment is the entire reason it feels like a rebate to the buyer. From their seat, the price dropped and they did nothing. From your seat, you just bought a parcel of certificates at a discount baked into the quote, and now you are carrying them until you sell them on. The “rebate” the customer felt is actually you taking a position in a commodity market on every single job.
Once you see it that way, you start asking the right question: did I price that parcel correctly, and how long is my money tied up in it?
The floating price is your problem, not the customer’s
The price of an STC is not fixed. It floats with the market, subject to a clearing-house mechanism with a notional cap, which means the dollar value you actually realise depends on when and how you trade (Clean Energy Regulator, n.d.). I am not going to quote you a price, because by the time you read this it will have moved. That is exactly the point.
When you quote a customer, you commit to a certificate value at the kitchen table. When you actually create and sell those certificates, the market may have shifted under you. If you quoted a fat assumed price and the market softened, that gap comes straight out of your margin. The customer got their fixed discount. You wore the movement.
This is why the lazy “it’s just the rebate” framing costs operators real money. A rebate has no timing risk. A certificate position has timing risk on every job, and the only way to manage it is to understand that you are holding a floating asset, not waiting on a cheque.
VEECs: same shape, different scheme
If you operate in Victoria, you have probably also bumped into VEECs, Victorian Energy Efficiency Certificates. They sit under a separate Victorian scheme administered at the state level, not the federal STC scheme, but the shape is the same: a tradeable certificate created from eligible activity, bought by liable parties to meet an obligation (Essential Services Commission, n.d.).
Same correction applies. A VEEC is not a rebate either. If you run jobs across state lines, keep the two schemes mentally separate, because the eligibility rules and the administrators are different, even though both reward you for understanding the mechanism instead of treating it as magic money.
Why this lands on your cashflow
Pull it together and you can see why poor certificate discipline quietly kills margin. You are carrying a floating-price asset on every job. The number of certificates depends on the deeming schedule, which steps down over time. The dollar value depends on when you trade. And none of it converts to cash until the paperwork is lodged and the certificates are created and sold.
Slow paperwork is the killer. Every job sitting in a pile of half-finished STC forms is working capital you have already spent on stock and labour, frozen in a certificate you have not created yet. Multiply that across a busy month and you have funded a small loan to the scheme out of your own pocket, for free.
The fix is boring and it is the same fix it has always been: lodge clean, lodge fast, and know exactly how many jobs are sitting between “installed” and “certificates sold” at any moment. That single number tells you more about your cashflow health than most operators realise. It belongs alongside the rest of the admin discipline that quietly decides whether a job made money.
This is one of the reasons I am building CurrentFlow. I wanted one place where the STC compliance step lives next to the quote and the job, so the paperwork is not a separate pile you get to on a Sunday night. It is designed to make the certificate side of a job impossible to lose track of. That is the idea, anyway; I am building it because I needed it.
For now, you do not need my tool to get the principle right. Stop calling it a rebate. Start treating it as what it is: a floating certificate you create, hold, and sell on every job, where timing and clean paperwork are the difference between full margin and money left on the roof.
References
Australian Government. (2000). Renewable Energy (Electricity) Act 2000. Federal Register of Legislation.
Clean Energy Regulator. (n.d.). Small-scale Renewable Energy Scheme. https://www.cleanenergyregulator.gov.au
Clean Energy Regulator. (n.d.). Small-scale technology certificates. https://www.cleanenergyregulator.gov.au
Clean Energy Regulator. (n.d.). How to create and trade small-scale technology certificates. https://www.cleanenergyregulator.gov.au
Essential Services Commission. (n.d.). Victorian Energy Upgrades program. Essential Services Commission, Victoria.
FAQ
Are STCs a government rebate?
No. STCs are tradeable certificates created from a system’s deemed generation under the federal Renewable Energy Target, not a fixed government payment. Liable entities, principally electricity retailers, must buy and surrender them to the Clean Energy Regulator to meet their legal obligations (Clean Energy Regulator, n.d.). The customer feels a “rebate” because they assign their right to create the certificates to you in exchange for an up-front discount, but the underlying mechanism is certificate trading.
Why does the STC value change between quoting and getting paid?
Because the STC price floats with the market rather than being fixed (Clean Energy Regulator, n.d.). When you quote, you commit to an assumed certificate value at the kitchen table. By the time you create and sell those certificates, the market may have moved, and any gap comes out of your margin. That timing risk is the main reason slow STC paperwork hurts cashflow.
What is the “deeming period” and why does it matter?
The deeming period is the number of years used to calculate how much generation a system is credited with up front, which sets the number of STCs it creates (Clean Energy Regulator, n.d.). It steps down over time as the scheme approaches its end date, so the same size system creates fewer certificates each year. That steady reduction is worth tracking, because it changes the value baked into your quotes.
Are VEECs the same as STCs?
No. VEECs are Victorian Energy Efficiency Certificates under a separate state-administered scheme, while STCs are federal (Essential Services Commission, n.d.; Clean Energy Regulator, n.d.). The shape is similar, a tradeable certificate bought by liable parties to meet an obligation, and the same correction applies: neither one is a rebate. If you work across state lines, keep the two schemes and their rules separate.
How does sloppy STC paperwork tie up my cashflow?
Every installed job whose certificates have not been created and sold is working capital you have already spent on stock and labour, frozen until the paperwork clears. The faster you lodge, the faster that money comes back. Knowing how many jobs sit between “installed” and “certificates sold” at any moment is one of the most useful cashflow numbers a solar operator can track.