Battery rebate rates and dates
The federal Cheaper Home Batteries Program gives around 30% off batteries connected to solar, through certificates set by the installation date. The WA Residential Battery Scheme adds a rebate by retailer. For the full conditions, the no-interest loans and published battery prices, see the solar battery cost guide.
Federal discount by installation date
Federal discount on a 10 kWh battery by installation date
| Installed | Certificates per kWh | 10 kWh at $40 a certificate, at most |
|---|---|---|
| By 31 December 2026 | 6.8 | $2,720 |
| 1 January to 30 June 2027 | 5.7 | $2,280 |
| 1 July to 31 December 2027 | 5.2 | $2,080 |
STC factors from DCCEEW, checked 5 October 2026. The dollar column is our arithmetic: 10 kWh × factor × $40 (the Clearing House price, excluding GST). 31 December 2026 is the last day for the 6.8 factor; after 2027 it keeps falling every six months, to 2.1 in the second half of 2030.
WA battery rebate by retailer
WA battery rebate by retailer
| Retailer | Rebate per kWh | Most you can get |
|---|---|---|
| Synergy | $130 | $1,300 (10 kWh or more) |
| Horizon Power | $380 | $3,800 (10 kWh or more) |
From Energy Policy WA's eligibility requirements, checked 5 October 2026. At least 5 kWh usable capacity. As of December 2025 the scheme was expected to run until 2027 or until 100,000 rebates are paid.
Synergy prices used in the payback
Synergy residential rates
| Plan or buy-back | When | Cents per unit |
|---|---|---|
| Home Plan (A1) | Any time | 33.2621 |
| Midday Saver, peak | 3pm–9pm | 55.3253 |
| Midday Saver, off-peak | 9pm–9am | 24.3431 |
| Midday Saver, super off-peak | 9am–3pm | 8.852 |
| DEBS solar buy-back, peak | 3pm–9pm | 10 |
| DEBS solar buy-back | Other times | 2 |
| REBS solar buy-back (older systems) | Any time | 7.135 |
Synergy's published prices from 1 July 2026, including GST; the DEBS and REBS buy-back rates are effective from 1 July 2025, and DEBS applies to the first 50 units exported each day. Checked 5 October 2026. Daily supply charges are left out.
Common questions
How is the federal battery discount worked out?
Your battery's usable capacity, in kWh, is multiplied by the STC factor for the date it's installed. The first 14 kWh count in full, each kWh from 14 to 28 counts at 60%, and each kWh from 28 to 50 at 15%. The result is rounded down to whole certificates, each worth up to $40 at the government's Clearing House price, excluding GST. Installers usually take the discount off the price.
Why does the calculator ask for the price basis?
Battery prices are quoted in different ways. Some are before any rebate, some already take off the federal discount, and some take off both. The calculator only takes off the rebates your price doesn't already include.
Where these figures come from
The rates and rules on this page come from these published pages, checked on 5 October 2026.
- DCCEEW: Cheaper Home Batteries Program · Australian Government, Department of Climate Change, Energy, the Environment and Water, updated 9 June 2026
- DCCEEW: small-scale technology certificates for batteries · Australian Government, DCCEEW, updated 9 July 2026
- REC Registry: small generation unit STC calculator · Clean Energy Regulator, live calculator
- Energy Policy WA: WA Residential Battery Scheme · WA Government, Energy Policy WA, updated 21 May 2026
- Energy Policy WA: battery scheme eligibility requirements · WA Government, Energy Policy WA, updated 15 April 2026
- Synergy: changes to your electricity prices (from 1 July 2026) · Synergy (WA Government-owned retailer), prices effective 1 July 2026, GST included
- Synergy: Distributed Energy Buyback Scheme (DEBS) · Synergy, effective as at 1 July 2025
- Tesla Powerwall 3 datasheet (Australia) · Tesla (manufacturer), 2025
- Western Power: what we do · Western Power (network operator), cited in the solar battery cost guide
