As Australian businesses look for smarter ways to manage electricity costs and reduce peak energy demand, large-scale Battery Energy Storage Systems (BESS) are becoming an increasingly attractive investment. For eligible commercial and industrial businesses in New South Wales, the BESS5 rebate can provide an opportunity to reduce the upfront cost of qualifying battery storage projects.
BESS5 is part of the NSW Peak Demand Reduction Scheme (PDRS) and is designed specifically for larger commercial and industrial battery installations.
What Is the BESS5 Rebate?
BESS5 is a PDRS activity that supports the installation of new battery energy storage systems at eligible commercial and industrial sites. Rather than functioning as a conventional cash rebate, the incentive is delivered through Peak Reduction Certificates (PRCs) generated from eligible projects.
The current PDRS information states that BESS5 covers batteries with a combined usable battery capacity greater than 200 kWh and up to 30,000 kWh (30 MWh). Incentives apply only to the first 10,000 kWh of capacity.
This makes BESS5 particularly relevant for businesses considering substantial energy storage systems for demand management, solar energy utilisation and long-term energy planning.
BESS5 Eligibility Requirements
Businesses considering a BESS5 project should carefully review the eligibility requirements before proceeding.
The site must not be a residential building or a data centre. In addition, the site must not have previously received a BESS4 or BESS5 incentive for the relevant implementation.
The battery system must fall within the required capacity range and satisfy the technical requirements under the PDRS rules. Businesses must also obtain the necessary planning and network approvals before the project can qualify.
All eligible installations must occur on or after 1 September 2026.
Battery Equipment Requirements
Battery technology must meet specific safety and technical requirements to qualify for BESS5.
One important requirement is that the battery must be tested in accordance with UL9540A, a recognised testing method for evaluating thermal runaway and fire propagation characteristics of battery energy storage systems.
The usable battery capacity must be greater than 200 kWh and no more than 30 MWh. The current NSW PDRS information also specifies that eligible batteries must be internet-connectable and controllable by a Demand Response Aggregator, alongside other connection and installation requirements.
The battery duration must not exceed six hours, while additional requirements apply to inverter capacity and, where applicable, new solar photovoltaic capacity.
Option 1: Solar PV With Battery Storage
Businesses can potentially achieve a higher incentive when installing new solar PV alongside battery storage.
For example, the supplied project scenario uses a 2.5 MW solar system with a 5 MWh battery system.
The estimated project figures are:
Total equipment: $4,870,000
Installation and delivery: $1,210,000
Total cost before incentives: $6,080,000
Pre-incentive payback: 7 years
PRC incentive value: $1,646,000
Total cost after incentives: $4,434,000
Post-incentive payback: 5.1 years
This example demonstrates how the addition of solar PV may improve the overall project economics while providing renewable electricity generation and energy storage.
Option 2: Battery-Only System
A battery-only project may be suitable for businesses that already have sufficient solar generation or primarily want to manage peak electricity demand.
The supplied example uses a 5 MWh battery system with the following figures:
Total equipment: $2,915,000
Installation and delivery: $220,000
Total cost before incentives: $3,135,000
Pre-incentive payback: 10 years
PRC incentive value: $1,103,000
Total cost after incentives: $2,032,000
Post-incentive payback: 6.5 years
Although the battery-only option has a lower initial project cost, the supplied figures show a longer post-incentive payback period than the solar-plus-battery option.
How Are BESS5 Incentives Calculated?
The BESS5 incentive is based on the project’s eligible peak demand reduction capacity and the applicable PDRS calculation methodology.
Importantly, incentives are capped. Certificates are capped at 10 MWh, and there is also a cap based on four hours multiplied by battery inverter capacity. For calculation purposes, usable battery capacity is calculated as 90% of nominal battery capacity, according to the requirements supplied for this project.
Where new solar PV is installed under Option 1, the project can receive a higher incentive, subject to the relevant eligibility and calculation requirements.
Why Consider BESS5 for Your Business?
A large commercial battery system can help businesses manage energy consumption more strategically. It can store electricity and discharge it during periods of high demand, potentially reducing reliance on grid electricity during peak periods.
When combined with solar PV, battery storage can also allow businesses to store surplus renewable energy and use it when solar generation is lower.
Choose OZ Smart Energy for Commercial Battery Solutions
Planning a large BESS project requires careful consideration of battery capacity, solar generation, inverter sizing, installation requirements, planning approvals and available incentives.
OZ Smart Energy can help businesses explore commercial solar and battery solutions tailored to their energy requirements. Whether you are considering a 5 MWh battery system or a larger commercial energy-storage project, professional system design can help you understand potential costs, incentives and expected returns.
If your business is considering the BESS5 rebate in NSW, contact OZ Smart Energy to discuss your project and determine the most suitable solar and battery solution.
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