physics

Small-scale Renewable Energy Scheme

Small-scale Renewable Energy Scheme is a physics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Small-scale Renewable Energy Scheme rather than just read about it. In short: The Small-scale Renewable Energy Scheme (SRES) is an Australian Government initiative that provides a financial incentive for households and small businesses to install eligible renewable energy systems. It is one of two parts of the Renewable Energy Target (RET), alongside the Large-scale Renewable Energy Target (LRET).

Key takeaways

Small-scale Renewable Energy Scheme belongs to physics; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Small-scale Renewable Energy Scheme to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Small-scale Renewable Energy Scheme from memory before moving on to harder problems.

Reference excerpt

The Small-scale Renewable Energy Scheme (SRES) is an Australian Government initiative that provides a financial incentive for households and small businesses to install eligible renewable energy systems. It is one of two parts of the Renewable Energy Target (RET), alongside the Large-scale Renewable Energy Target (LRET). The scheme is administered by the Clean Energy Regulator through the REC Registry. The SRES was established in 2011 when the original Renewable Energy Target was split into the LRET and SRES under the Renewable Energy (Electricity) Act 2000. The scheme is legislated to end on 31 December 2030, after which no new certificates can be created.

How the scheme works When an eligible small-scale renewable energy system is installed, the system owner can create small-scale technology certificates (STCs). Each STC represents one megawatt-hour (MWh) of deemed electricity generation or displacement. In practice, most system owners assign their right to create STCs to their installer or a registered agent in exchange for an upfront discount on the purchase price. The Clean Energy Regulator estimates this discount reduces installation costs by approximately 30%. Electricity retailers and other "liable entities" are legally required to purchase and surrender STCs annually to meet their obligations under the RET. This creates the demand side of the STC market.

Eligible technologies Six types of small-scale renewable energy systems are eligible under the SRES:

Solar photovoltaic (PV) systems up to 100 kW capacity Solar batteries with 5-100 kWh nominal capacity (eligible from 1 July 2025) Wind turbines up to 10 kW capacity Hydro systems up to 6.4 kW capacity Solar water heaters up to 700 litres capacity Air source heat pumps up to 425 litres capacity All components must be listed on the Clean Energy Council approved products list and installed by accredited professionals. STCs must be created within 12 months of installation.

STC calculation The number of STCs a solar PV system generates is calculated using the formula:

STCs = System size (kW) x Zone rating x Deeming period (years)

Postcode zones Australia is divided into four zones based on solar irradiance levels. Each zone has a rating that reflects average solar output per kilowatt of installed capacity:

Deeming period Systems are credited upfront for all the renewable energy they are expected to generate between the installation date and 31 December 2030. As the scheme end date approaches, the deeming period decreases, reducing the number of STCs per installation:

For example, a 6.6 kW system installed in Zone 3 in 2026 would generate: 6.6 x 1.382 x 5 = 45 STCs, worth approximately $1,800 at the Clearing House price.

STC Clearing House STCs can be traded on the open market or through the Clean Energy Regulator's STC Clearing House at a fixed price of $40 per certificate (excluding GST). The Clearing House operates on a first-in, first-served basis. In the September quarter of 2025, 6.3 million STCs were purchased through the Clearing House, up from 4.8 million in the same quarter of 2024.

Small-scale technology percentage The small-scale technology percentage (STP) determines the number of STCs each liable entity must surrender annually. For 2026, the STP is set at 11.67%, based on an estimated 24.1 million STCs to be created during the year. The STP must be set by 31 March each year. Non-binding forecasts project the STP at 10.75% for 2027 and 7.77% for 2028, reflecting the declining deeming period as the scheme approaches its end date. Solar battery STCs are not included in the STP calculation. The Australian Government purchases all battery-related STCs separately under the Cheaper Home Batteries Program.

Statistics As of December 2024, more than 4 million small-scale renewable energy systems have been validated with STCs in Australia. Approximately one in three suitable Australian homes now have rooftop solar, generating over 12% of grid electricity. In the first three quarters of 2025, approximately 229,000 solar PV systems were installed with a combined capacity of 2.3 GW. The average system size in the September quarter of 2025 was 10.4 kW, up from 10.0 kW in the same period of 2024.

Cheaper Home Batteries Program From 1 July 2025, solar batteries became eligible under the SRES through the Cheaper Home Batteries Program. By November 2025, over 124,000 batteries had been installed with a combined capacity of 2.7 GWh, exceeding the capacity of the five largest utility-scale batteries on the National Electricity Market. The average battery size is 18.3 kWh of usable capacity, with 53% retrofitted to existing solar systems. The program was expanded in December 2025 from an original $2.3 billion allocation to $7.2 billion over four years.

See also Renewable energy targets in Australia Renewable energy in Australia Solar power in Australia Feed-in tariff Solar credits

References

External links Small-scale Renewable Energy Scheme - Clean Energy Regulator Small generation unit STC calculator - REC Registry Australian STC market statistics and installation trends - Why Solar STC rebate calculator - Why Solar

Worked examples

Example 1 — a first encounter with Small-scale Renewable Energy Scheme

Start with the simplest possible case. Write down what Small-scale Renewable Energy Scheme claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In physics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Small-scale Renewable Energy Scheme before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Small-scale Renewable Energy Scheme ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Small-scale Renewable Energy Scheme

In research: Small-scale Renewable Energy Scheme appears in physics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Small-scale Renewable Energy Scheme in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Small-scale Renewable Energy Scheme is common in secondary-school and first-year university syllabi. It links to neighbouring topics Climate change in Australia, Energy policy of Australia, Renewable energy in Australia, so understanding it makes those chapters shorter.
In everyday life: Look for Small-scale Renewable Energy Scheme outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Small-scale Renewable Energy Scheme in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Small-scale Renewable Energy Scheme means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Small-scale Renewable Energy Scheme out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Small-scale Renewable Energy Scheme in simple terms?

Why does Small-scale Renewable Energy Scheme matter?

Because it connects several physics ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Small-scale Renewable Energy Scheme?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Small-scale Renewable Energy Scheme.