The procurement of commercial solar and Battery Energy Storage Systems (BESS) requires rigorous evaluation of technical, financial, and regulatory factors. With the introduction of the NSW Peak Demand Reduction Scheme (PDRS) BESS4 and BESS5 incentives commencing on 1 September 2026 [1], and the proposed expansion of the federal Small-scale Renewable Energy Scheme (SRES) to 1 MW intended from 1 October 2026 (subject to regulations) [2], procurement leaders must navigate a complex landscape. This guide provides an exhaustive RFP checklist for Australian commercial property owners, CFOs, and facilities managers to de-risk their solar and BESS investments.
Why a Comprehensive RFP is Critical for Solar and BESS
Procuring a commercial solar and BESS solution is not a standard equipment purchase; it is a long-term infrastructure investment that impacts site operations, safety, and energy costs. A poorly structured Request for Proposal (RFP) can lead to mismatched system sizing, compliance failures, and missed financial incentives. By standardising the evaluation criteria, procurement teams can objectively compare vendor capabilities, technical designs, and commercial terms.
Our company-reported secured pipeline of 3 MW demonstrates the growing demand for robust commercial BESS solutions. However, successful delivery relies on a procurement process that scrutinises every aspect of the proposed system, from interval data analysis to fire engineering and performance guarantees.
The Exhaustive Commercial Solar and BESS RFP Checklist
To ensure a rigorous evaluation, your RFP should require vendors to address the following critical areas.
1. Interval Data and Sizing Analysis
Vendors must base their system sizing on actual site interval data (typically 15-minute or 30-minute resolution) rather than generic load profiles. The RFP should request detailed modelling showing how the proposed solar and BESS capacities align with the site's peak demand and energy consumption patterns.
2. Site Constraints and Network Planning
The proposal must identify physical site constraints, including roof structural integrity, available space for the BESS, and access for installation and maintenance. Furthermore, vendors must outline the process for securing network connection approvals, as systems over 20 kWh require relevant planning approvals [3].
3. Single-Line Diagrams and Engineering
Require preliminary single-line diagrams (SLDs) that illustrate the electrical integration of the solar PV, BESS, inverters, and existing site infrastructure. This ensures the proposed design is technically viable and complies with AS/NZS 5139 installation standards [1].
4. Fire Engineering and Safety Compliance
Fire safety is paramount for commercial BESS installations. BESS5 proposals must provide UL 9540A test evidence for the proposed system [1]; buyers may also request relevant propagation-test evidence for other projects as part of a risk-based fire strategy. Vendors should provide a preliminary fire engineering brief detailing separation distances, fire controls, emergency procedures and local approval requirements.
5. Warranties and Performance Guarantees
Evaluate the comprehensiveness of the warranties offered for the solar panels, inverters, and battery modules. Crucially, the RFP should demand clear performance guarantees, including battery degradation curves, round-trip efficiency, and system availability metrics over the expected lifecycle.
6. Controls, EMS, and Cyber Security
The Energy Management System (EMS) is the brain of the BESS. Vendors must detail the EMS capabilities, including peak shaving, load shifting, and integration with the site's existing Building Management System (BMS). Additionally, the RFP must address cyber security protocols to protect the EMS from unauthorised access.
7. Commissioning, Training, and O&M
A successful handover requires rigorous commissioning procedures and comprehensive training for site facilities staff. The RFP should also request detailed Operations and Maintenance (O&M) schedules, including preventative maintenance tasks and response times for corrective actions.
8. Incentive Responsibility and Compliance
With the introduction of BESS4 (>20–200 kWh for small/medium businesses) and BESS5 (>200–30,000 kWh for commercial/industrial sites) [1], the RFP must clarify who is responsible for creating and monetising the Peak Reduction Certificates (PRCs). For BESS5, PRC support applies only to the first 10,000 kWh of eligible capacity. Vendors must identify the exact activity requirements applying to the proposed system rather than present one generic compliance list. BESS4 and BESS5 are variable PRC-funded incentives, not guaranteed fixed rebates, and their value depends on market certificate prices (e.g., an indicative $3.00 PRC assumption as of August 2026) [4].
The RFP should also require separate treatment of federal support. Eligible small-business batteries with 5–100 kWh nominal capacity may create battery STCs on the first 50 kWh of usable capacity, subject to the 2026 taper and all CER requirements [5]. The announced expansion of solar SRES eligibility above 100 kW and up to 1 MW is intended from 1 October 2026 but remains subject to regulations [2]. Require bidders to state which assumptions are current, which are proposed and who bears the risk if a rule changes before implementation.
Evaluating Vendor Responses: The Scorecard
To objectively assess vendor proposals, establish a weighted evaluation scorecard. The following table provides a recommended framework for commercial solar and BESS procurement.
| Evaluation Criteria | Description | Recommended Weighting |
|---|---|---|
| Technical Solution | System sizing, SLDs, equipment quality, and EMS capabilities. | 30% |
| Safety and Compliance | UL 9540A compliance, fire engineering, and AS/NZS 5139 adherence. | 20% |
| Commercial Terms | Capital cost, projected ROI, warranties, and performance guarantees. | 25% |
| Vendor Capability | Track record, financial stability, and O&M support structure. | 15% |
| Incentive Management | Expertise in navigating BESS4/BESS5 and SRES compliance. | 10% |
Identifying Red Flags in BESS Proposals
During the evaluation process, procurement teams should be vigilant for red flags that indicate a high-risk proposal. These include:
- Generic Sizing: Proposals based on estimated bills rather than actual interval data.
- Missing Safety Certifications: Failure to provide evidence of UL 9540A testing for the BESS.
- Unrealistic Incentive Claims: Promising fixed dollar amounts for BESS4/BESS5 without disclosing the underlying PRC price assumptions or acknowledging the variable market value.
- Vague Warranties: Lack of specific degradation curves or performance guarantees.
Next Steps for Procurement Leaders
A rigorous RFP process is the foundation of a successful commercial solar and BESS project. By demanding detailed technical, safety, and commercial information, procurement teams can select a vendor capable of delivering long-term value and compliance.
For a comprehensive evaluation of your site's potential, consider our commercial energy assessment. You can also explore our solar system cost calculator and battery storage payback calculator to begin modelling your business case. To discuss your specific procurement requirements, review our capability statement or contact our team for a procurement-ready scope review.
References
[1] IPART, "PDRS Rule and changes," Energy Sustainability Schemes NSW. Available: https://www.energysustainabilityschemes.nsw.gov.au/pdrs-rule-and-changes
[2] Clean Energy Regulator, "Expansion of solar PV eligibility under the SRES," Australian Government. Available: https://cer.gov.au/news-and-media/news/2026/august/expansion-solar-photovoltaic-pv-eligibility-under-small-scale-renewable-energy-scheme
[3] IPART, "Peak Shifting," Energy Sustainability Schemes NSW. Available: https://www.energysustainabilityschemes.nsw.gov.au/peak-shifting
[4] Solar Choice, "NSW Commercial Battery Rebate," Solar Choice. Available: https://www.solarchoice.net.au/commercial-solar/nsw-bess-battery-rebate/
[5] Clean Energy Regulator, "Solar batteries," Australian Government. Available: https://cer.gov.au/schemes/renewable-energy-target/small-scale-renewable-energy-scheme/small-scale-renewable-energy-systems/solar-batteries