The Finance Algorithm

Solar and battery rebates, and who is installing them.

A 24.4 kWh battery, the average installed since 1 May 2026, comes with about $4,864 off if it is installed by 31 December 2026. From 1 January 2027 the same battery gets about $4,083, as the certificates each kWh earns fall from 6.8 to 5.7. Here's what yours is worth, and how many of your neighbours have already done it.

Clean Energy Regulator data to 30 September 2026, updated monthly.

Work out your discountYour state

Discount on a 24.4 kWh battery

$4,864

If it's installed by 31 December 2026: 137 certificates at $35.50 each.

From 1 January 2027$4,083 ($781 less)
Batteries installed
546,789
since 1 July 2025
Storage added
15.3 GWh
28.0 kWh each
Solar systems
4,562,198
since 2001
Busiest month
87,128
batteries, April 2026

What your panels and battery are worth, before and after 1 January 2027

Your postcode sets the solar zone. The battery starts at the average installed since 1 May 2026 and the panels at the average new system over the last year; change both.

Sets your solar zone, local uptake and the default rates below.

New solar panels
10.3 kW
Battery, usable capacity
24.4 kWh

Certificates stop at 50 kWh. The usable figure is on the battery's spec sheet.

CER says installers usually pay $33 to $38; ask what your quote uses.

Installed by 31 December 2026
$4,864

137 certificates (137 for the battery) at $35.50 each. Add your postcode to count the panels.

From 1 January 2027
$4,083 115 certificates

Installing on or after 1 January 2027 costs about $781 more.

Will it pay for itself?

Leave empty to see the yearly saving alone.

Share of your solar used at home
30%

Starts at 30%: put in your installer's estimate. A battery raises it.

National median: 2.00c.

National median single rate, with GST: 28.78c.

Enter your postcode to estimate what the panels generate.

The discount on common batteries and solar systems, step by step

Dollars at $35.50 a certificate, with the certificates beneath. Bigger batteries earn less per kWh: the factor applies in full to the first 14 kWh, at 60% to the next 14 and at 15% up to 50.

Battery, usableBy 31 Dec 20266.8 a kWhFrom 1 Jan 20275.7 a kWhFrom 1 Jul 20275.2 a kWh
5 kWh$1,20734 certificates$99428 certificates$92326 certificates
10 kWh$2,41468 certificates$2,02457 certificates$1,84652 certificates
13.5 kWh$3,23191 certificates$2,69876 certificates$2,48570 certificates
20 kWh$4,225119 certificates$3,550100 certificates$3,23191 certificates
25 kWh$4,970140 certificates$4,154117 certificates$3,799107 certificates
30 kWh$5,467154 certificates$4,580129 certificates$4,189118 certificates
40 kWh$5,822164 certificates$4,864137 certificates$4,438125 certificates
50 kWh$6,177174 certificates$5,183146 certificates$4,722133 certificates
Solar zone6.6 kWBy 31 Dec 20266.6 kWFrom 1 Jan 202710 kWBy 31 Dec 202610 kWFrom 1 Jan 2027
Zone 1Alice Springs$1,88253$1,49142$2,87681$2,27264
Zone 2Darwin$1,77550$1,42040$2,69876$2,16661
Zone 3Sydney, Brisbane, Perth, Adelaide, Canberra$1,59845$1,27836$2,45069$1,95355
Zone 4Melbourne, Hobart$1,38539$1,10131$2,09559$1,66947

Solar certificates are panel kW times the zone rating times the deeming years (5 for systems installed in 2026, 4 from 1 January 2027), rounded down. Your postcode's zone is in the calculator above.

546,789 batteries in 15 months, 87,128 of them in April 2026 alone

Batteries by month of installation, with the average usable size beneath. The latest months will still rise: installers have 12 months to create certificates, and September 2026 is the least complete. Source: Clean Energy Regulator.
Show the figures
Home batteries installed each month
MonthBatteriesAverage size
July 202529,52317.5 kWh
August 202525,80419.4 kWh
September 202531,13722.3 kWh
October 202536,73224.4 kWh
November 202538,71426.6 kWh
December 202545,39830.4 kWh
January 202628,60629.3 kWh
February 202640,80931.0 kWh
March 202655,34233.5 kWh
April 202687,12836.8 kWh
May 202623,67921.9 kWh
June 202629,79524.2 kWh
July 202631,76924.8 kWh
August 202627,49825.5 kWh
September 202614,85525.9 kWh
Before 1 May 2026
87,128 batteries went in during April 2026, averaging 36.8 kWh and 307 certificates each. In May 2026, under the lower factor and the size taper, the average battery was 21.9 kWh and earned 121.
Certificates so far
122,458,041 battery certificates validated, worth about $4.3 billion in discounts at $35.50 each. The government buys an equal number of certificates, so the batteries do not add to anyone's power bill.
Biggest batteries
New South Wales averages 29.9 kWh a battery and Tasmania 20.1 kWh, against 28.0 kWh nationally.

New South Wales has the most batteries, and the most for the solar it already has

Batteries per 100 solar systems compares battery uptake with the solar a state already has, since a battery needs panels. Feed-in tariffs are the median flat rate among open residential plans.

StateBatteriesPer 100 solarAverage batterySolar systemsLast 12 monthsFeed-in tariff
NSW187,15415.629.9 kWh1,199,50093,2833.00c
QLD110,5789.028.7 kWh1,228,05386,5681.00c
VIC110,02912.128.9 kWh912,80066,9271.00c
WA61,21010.421.6 kWh589,44239,517-
SA60,45812.925.9 kWh468,64029,5761.00c
ACT10,31014.928.2 kWh69,2595,3703.00c
TAS5,6768.320.1 kWh68,3895,43410.87c
NT1,3745.327.7 kWh26,1111,169-
Australia546,78912.028.0 kWh4,562,198327,8442.00c

Batteries since 1 July 2025 and solar systems since 2001, to 30 September 2026. "Last 12 months" is solar systems installed in the year to September 2026. States are summed from postcodes using Australia Post's ranges, so a border postcode can land in a different state from the Regulator's own tables.

New South Wales

NSW

187,154 batteries since July 2025, 15.6 for every 100 solar systems, averaging 29.9 kWh. 93,283 solar systems went in over the year to September 2026.

July 2025Batteries a monthSeptember 2026
Best published feed-in tariffs

Median 3.00c a kWh across 2,294 open plans with a flat rate; 133 more pay by time of day.

  1. Origin EnergyOrigin Solar Partner Plus, usage 30.12c, supply $1.51 a day12.00c
  2. GloBird EnergySOLARPLUS Residential (Flat Rate CTL Load)-Endeavour, usage 33.00c, supply $1.24 a day10.00c
  3. Alinta EnergySolarBalance Choice - Demand Single Rate, usage 25.58c, supply $1.52 a day8.00c
  4. ActewAGLSolar Saver - single rate with controlled load 1, usage 30.66c, supply $1.81 a day5.00c
  5. Sumo Power (legacy)Sumo Static, usage 28.61c, supply $1.44 a day3.30c
Every NSW electricity plan

Queensland

QLD

110,578 batteries since July 2025, 9.0 for every 100 solar systems, averaging 28.7 kWh. 86,568 solar systems went in over the year to September 2026.

July 2025Batteries a monthSeptember 2026
Best published feed-in tariffs

Median 1.00c a kWh across 746 open plans with a flat rate; 21 more pay by time of day.

  1. Origin EnergyOrigin Solar Partner Plus, usage 25.43c, supply $1.75 a day12.00c
  2. Alinta EnergySolarBalance Ready - Single Rate + CL, usage 24.67c, supply $1.69 a day10.00c
  3. GloBird EnergySOLARPLUS Residential (Flat Rate CTL Load)-Energex, usage 26.40c, supply $1.41 a day10.00c
  4. Sumo Power (legacy)Sumo Static, usage 24.16c, supply $1.66 a day8.80c
  5. Red EnergyRed Wildlife Saver, usage 25.43c, supply $1.75 a day5.00c
Every QLD electricity plan

Victoria

VIC

110,029 batteries since July 2025, 12.1 for every 100 solar systems, averaging 28.9 kWh. 66,927 solar systems went in over the year to September 2026.

July 2025Batteries a monthSeptember 2026
Best published feed-in tariffs

Median 1.00c a kWh across 2,114 open plans with a flat rate; 390 more pay by time of day.

  1. Origin EnergyOrigin Solar Partner Plus - Oct'26 (Single Rate with Dedicated Circuit), usage 23.60c, supply $1.10 a day12.00cfirst 8 kWh, then 1.00c
  2. EnergyAustraliaSolar Max - Peak with Controlled Load, usage 23.60c, supply $1.10 a day8.00cfirst 10 kWh, then 1.50c
  3. ENGIEVIC _ ENGIE EV Flex Charge Elec, usage 23.60c, supply $1.10 a day8.00cfirst 8 kWh, then 1.00c
  4. MYOB powered by OVOThe One Plan - OCT2026, usage 17.93c, supply $0.84 a day2.20c
  5. OVO EnergyThe One Plan - OCT2026, usage 17.93c, supply $0.84 a day2.20c
Every VIC electricity plan

Western Australia

WA

61,210 batteries since July 2025, 10.4 for every 100 solar systems, averaging 21.6 kWh. 39,517 solar systems went in over the year to September 2026.

July 2025Batteries a monthSeptember 2026

Western Australia retailers do not publish their plans through the Consumer Data Right, so there are no feed-in tariffs to compare here. The calculator uses the national median; ask your retailer for its buyback rate.

South Australia

SA

60,458 batteries since July 2025, 12.9 for every 100 solar systems, averaging 25.9 kWh. 29,576 solar systems went in over the year to September 2026.

July 2025Batteries a monthSeptember 2026
Best published feed-in tariffs

Median 1.00c a kWh across 345 open plans with a flat rate; 26 more pay by time of day.

  1. Origin EnergyOrigin Solar Partner Plus, usage 38.10c, supply $1.64 a day12.00c
  2. Alinta EnergySolarBalance Choice - Single Rate + CL, usage 40.01c, supply $1.72 a day5.00c
  3. Diamond EnergyDiamond Everyday - Single Rate, usage 38.10c, supply $1.64 a day3.10c
  4. COVAU PTY LIMITEDFreedom Residential Single + CL, usage 42.58c, supply $1.52 a day3.00c
  5. EnergyAustraliaFlexi Plan, usage 38.10c, supply $1.64 a day3.00c
Every SA electricity plan

Australian Capital Territory

ACT

10,310 batteries since July 2025, 14.9 for every 100 solar systems, averaging 28.2 kWh. 5,370 solar systems went in over the year to September 2026.

July 2025Batteries a monthSeptember 2026
Best published feed-in tariffs

Median 3.00c a kWh across 244 open plans with a flat rate; 6 more pay by time of day.

  1. Origin EnergyOrigin Solar Partner Plus, usage 26.50c, supply $2.40 a day12.00c
  2. ActewAGLSolar Saver - single rate, usage 33.59c, supply $1.22 a day5.00c
  3. 1st Energy (EL Retail Energy)Home Choice, usage 31.30c, supply $1.53 a day3.00c
  4. EnergyAustraliaFlexi Plan, usage 33.47c, supply $1.24 a day3.00c
  5. Red EnergyLiving Energy Saver (020), usage 26.11c, supply $1.24 a day2.50c
Every ACT electricity plan

Tasmania

TAS

5,676 batteries since July 2025, 8.3 for every 100 solar systems, averaging 20.1 kWh. 5,434 solar systems went in over the year to September 2026.

July 2025Batteries a monthSeptember 2026
Best published feed-in tariffs

Median 10.87c a kWh across 24 open plans with a flat rate.

  1. Solstice EnergySelect Residential Flat Rate, usage 21.82c, supply $1.64 a day11.00c
  2. COVAU PTY LIMITEDFreedom Residential Anytime, usage 29.95c, supply $1.10 a day10.87c
  3. 1st Energy1st Quartz - Tariff 31, Residential Light & Power, usage 25.40c, supply $1.52 a day9.28c
Every TAS electricity plan

Northern Territory

NT

1,374 batteries since July 2025, 5.3 for every 100 solar systems, averaging 27.7 kWh. 1,169 solar systems went in over the year to September 2026.

July 2025Batteries a monthSeptember 2026

Northern Territory retailers do not publish their plans through the Consumer Data Right, so there are no feed-in tariffs to compare here. The calculator uses the national median; ask your retailer for its buyback rate.

A high feed-in tariff often comes with a higher usage or supply charge, a cap on the kWh it applies to, or conditions; open the plan before you switch.

4,562,198 rooftop solar systems since 2001, and the average one in 2025 was 4.3 times the size of one in 2011

Systems by year of installation, with the average size beneath. 2026 runs to September 2026 and is still being counted. Another 283,311 went in from 2001 to 2010. Source: Clean Energy Regulator.
Show the figures
Rooftop solar systems installed each year
YearSystemsAverage size
2011360,7452.4 kW
2012343,3203.0 kW
2013200,4074.0 kW
2014180,1394.4 kW
2015141,5005.0 kW
2016132,6975.6 kW
2017174,9426.4 kW
2018224,8527.2 kW
2019284,0317.6 kW
2020370,3208.0 kW
2021377,4588.5 kW
2022315,7178.8 kW
2023333,8659.4 kW
2024319,1819.9 kW
2025272,48010.3 kW
2026, to September 2026247,23310.1 kW

How the discount works: certificates, sold by your installer

Certificates

New solar panels and batteries earn small-scale technology certificates under the Small-scale Renewable Energy Scheme. Most people sign the right to them over to the installer, who takes their value off the price.

Solar

Panel kW times your postcode zone's rating (the MWh a kW is deemed to make in a year) times the deeming years left in the scheme, rounded down. The deeming years fall by one every 1 January until the scheme ends with 2030.

Batteries

Usable kWh times the factor for the date the installation is certified: in full on the first 14 kWh, 60% on the next 14 and 15% up to 50, rounded down. The factor falls every 1 January and 1 July. A battery has to be connected to solar, new or existing.

The price

The government does not set what a certificate is worth. The Regulator says installers usually pay $33 to $38; on the open market certificates changed hands at $39.85 on 14 August 2026. This page uses $35.50.

FromBattery factor, per kWhSolar deeming years
1 January 2025-6
1 July 20259.36
1 January 20268.45
1 May 2026now6.85
1 January 20275.74
1 July 20275.24
1 January 20284.63
1 July 20284.13
1 January 20293.62
1 July 20293.12
1 January 20302.61
1 July 20302.11
1 January 2031Scheme endsScheme ends

Batteries became eligible on 1 July 2025; the size taper applies from 1 May 2026. Schedules from the Clean Energy Regulator and the Renewable Energy (Electricity) Regulations 2001, and postcode zones from the Regulator's zone ratings table, checked 7 October 2026.

Where the figures come from

Installations: Clean Energy Regulator, small-scale installation postcode data, to 30 September 2026, published 20 October 2026. Based on Clean Energy Regulator material licensed under a Creative Commons Attribution 4.0 licence. Normalised by The Finance Algorithm: monthly files summed by state and postcode, with states taken from Australia Post postcode ranges. It counts every system whose certificates have been validated, including upgrades and off-grid systems.

Feed-in tariffs and usage rates: the electricity plans retailers publish under the Consumer Data Right, last changed by a retailer on 28 Oct 2026, residential market offers open to anyone. See every plan in the energy explorers.

General information, not financial advice. The discount you get depends on your installer's certificate price and your system's exact usable capacity; state rebates are not included. Check the quote and the Regulator's battery rules before you sign.

Questions people are asking

How much is the home battery rebate?
Under the Cheaper Home Batteries Program a battery installed by 31 December 2026 earns 6.8 small-scale technology certificates per kWh of usable capacity on its first 14 kWh, 60% of that on the next 14 kWh and 15% up to 50 kWh. Installers take the certificates in return for an upfront discount: at $35.50 a certificate, about $2,414 off a 10 kWh battery and $4,864 off a 24.4 kWh battery, the average size installed since 1 May 2026.
When does the battery rebate drop?
On 1 January 2027, when the factor falls from 6.8 to 5.7 certificates per kWh: a 10 kWh battery goes from about $2,414 to $2,024 off. It then falls again every 1 January and 1 July until the scheme ends with 2030. The factor is set by the date the installation is completed and certified, not the date of the quote or contract.
How many home batteries have been installed in Australia?
546,789 from 1 July 2025 to 30 September 2026, adding 15.3 GWh of usable storage, 28.0 kWh each on average. The busiest month was April 2026, with 87,128, in the rush before the factor cut and size taper of 1 May 2026. The latest months will still rise: installers have 12 months to create certificates, and a battery is counted once they are validated.
Which state has the most home batteries?
New South Wales, with 187,154 since July 2025, then Queensland (110,578) and Victoria (110,029). Against the solar already on roofs, New South Wales leads with 15.6 batteries for every 100 solar systems installed since 2001; the national figure is 12.0.
How much is the solar panel rebate for a 6.6 kW system?
It depends on your postcode's zone. Installed by 31 December 2026, a 6.6 kW system earns 45 certificates (about $1,598) in zone 3, which includes Sydney, Brisbane, Perth, Adelaide and Canberra, and 39 (about $1,385) in zone 4, which includes Melbourne and Hobart. From 1 January 2027 the deeming period drops from 5 to 4 years, so the same systems earn 36 and 31.
What feed-in tariff will I get for exported solar?
The median flat feed-in tariff among open residential electricity plans, as retailers publish them: NSW 3.00c, VIC 1.00c, QLD 1.00c, SA 1.00c, TAS 10.87c, ACT 3.00c per kWh, as of 28 Oct 2026. The highest published rates are listed by state on this page; they often come with higher usage or supply charges. WA and NT retailers do not publish plans through the Consumer Data Right.
Why are the latest months lower?
Installers have 12 months from installation to create certificates, and the Clean Energy Regulator counts a system once its certificates are validated. The most recent months keep rising for up to a year, and September 2026 is the least complete.
Where do these figures come from?
Installations come from the Clean Energy Regulator's small-scale installation postcode data, published monthly under a Creative Commons Attribution 4.0 licence and normalised by The Finance Algorithm. Feed-in tariffs and usage rates come from the plans retailers publish under the Consumer Data Right. Certificate factors, deeming periods and postcode zones come from the Regulator and the Renewable Energy (Electricity) Regulations 2001, checked 7 October 2026.