Solar Base

Battery STC calculator

Certificates a home battery creates under the Cheaper Home Batteries Program, with the factor and the capacity tiers for when it goes in.

Usable, from the spec sheet, not nominal
STCs created 91 $3,458.00 at $38.00 each
Factor6.8 (1 May to 31 December 2026)
Capacity counted13.50 kWh after tiers
Before rounding91.80

How it's worked out

Usable capacity × the factor for the period the battery is installed in, rounded down. From 1 May 2026 the factor applies in full to the first 14 kWh, at 60% from 14 to 28 kWh and at 15% from 28 to 50 kWh, and nothing above 50 kWh counts: 6.8 × 13.5 = 91.80

Factors and tiers: Renewable Energy Legislation (2026 Measures No. 1) Amendment Regulations 2026 and the Clean Energy Regulator's Cheaper Home Batteries pages. Checked 21 October 2026. An estimate: the REC Registry decides the final count.

Solar Base keeps every job on one record, from the first enquiry to the meter alteration, and does the portal work for you. See how it works

How battery STCs are worked out

A home battery creates small-scale technology certificates under the Cheaper Home Batteries Program. The count is its usable capacity times a factor that steps down every six months until the scheme ends in 2030.

Since 1 May 2026 the factor is applied in tiers, so the first 14 kWh earn the most. For those batteries the date that counts is when the installation is certified safe and lawful, which is usually the date on the certificate of electrical safety. The Regulator's own line is that the rebate is set by the installation date, not the date the contract was signed.

STCs = factor × (first 14 kWh + 60% of 14 to 28 kWh + 15% of 28 to 50 kWh)

Worked example

Battery25 kWh usable
Installed1 May to 31 December 2026: factor 6.8
Counted14 kWh in full, 11 kWh at 60%
6.8 × (14 + 11 × 0.6) = 140.08140 STCs

Questions installers ask

Which batteries are eligible?

Batteries with a nominal capacity of 5 to 100 kWh that meet the program's product and installation rules, and that are technically able to join a virtual power plant if the site is grid connected. Certificates are only created on the first 50 kWh of usable capacity.

Why does it use usable capacity?

The program counts usable capacity, which is less than the nominal figure on the box. Take it from the spec sheet.

Can the solar and the battery on one job both create certificates?

Yes, separately. Work out the solar's with the STC calculator.

How long do I have to create them?

Twelve months from the installation date, in the REC Registry, as for solar.

A tool does one sum. Solar Base does the whole job.

The STC count, the NMI, the meter alteration and the invoice, worked off one job record, with the last step left to you.

Register interest
91 STCs
$3,458.00
Show the breakdown