The direct answer
Commercial solar and battery procurement is strongest when the load is understood before equipment is selected. A valid comparison discloses the source and quality of interval data, tariff/demand-charge assumptions, operating profile, export constraints, design scope, connection requirements, incentive dependencies and exclusions.
Cable Co’s Commercial BESS Business Case is designed for that standard: it accepts NEM12/CSV interval data or manual inputs, labels model confidence and exposes the assumptions that change the outcome. It is decision support, not a savings guarantee or an investment recommendation.
A comparison framework procurement teams can use
| Proposal component | What to request | Why it changes the decision |
|---|---|---|
| Load evidence | Interval-data period, gaps, units, peak demand, seasonality and operational changes | Battery dispatch and PV self-consumption depend on the actual load shape. |
| Tariff basis | Energy, demand, fixed and export assumptions; GST basis; date and retailer/network context | A model can look attractive simply because its tariff inputs are optimistic. |
| PV / BESS design | kW/kWh, inverter limits, usable capacity, degradation/warranty assumptions, dispatch logic and site constraints | Prevents comparing nominal capacity with usable, controllable energy. |
| Network / electrical works | Existing supply, switchboard, protection, metering, export control and application responsibilities | Site and network works may determine deliverability and cost. |
| Incentive pathway | Relevant program/activity, responsible party, evidence, timing, customer obligations and exclusions | Incentives are conditional and must not be booked as assured value. |
| Delivery / support | Design sign-off, installation, commissioning, monitoring, warranties, defects and change-control process | Clarifies where scope responsibility sits after award. |
The most common procurement error: treating a model as a quote
An early business case can guide a decision to investigate, but it cannot replace site engineering, network connection assessment, commercial terms or verified incentive eligibility. Keep three documents distinct:
- Screening model: directional, assumption-led, explicitly confidence-rated.
- Engineering proposal: site-specific scope, exclusion register, technical design and delivery pathway.
- Contract schedule: final obligations, price basis, variations, warranties, acceptance tests and evidence.
How certificates and accreditation fit
IPART ACP status and SAA accreditation relate to different compliance roles. IPART ACPs may create certificates from eligible NSW Energy Security Safeguard activities, while SAA accreditation relates to eligible small-scale design/installation classes. Neither label alone proves that a commercial project will be approved, funded, economically positive or network-ready. Read the detailed distinction in IPART ACP vs SAA accreditation.
The diligence pack before a recommendation
- 12 months or more of available interval/bill data and known upcoming load changes;
- roof, asset, access, structural and safety constraints;
- electrical single-line and switchboard information where available;
- tariff schedule and demand-charge details;
- metering, retailer and distributor facts;
- site-specific system design and a list of all exclusions;
- incentive evidence and an assumption log;
- commissioning, monitoring, warranty and maintenance obligations.
Use Cable Co’s Commercial C.A.B.L.E. assessment to create a structured starting brief, then proceed to the interval-data BESS business-case tool. Procurement teams can also request the gated Commercial Solar & BESS RFP Workbook below; it is designed to structure, not replace, their own legal and procurement process.
Frequently asked questions
What data is needed for a commercial BESS proposal?
Interval data is the best basis for assessing a battery because it shows when energy and demand occur. If only bills are available, the result should carry lower confidence and disclose the manual assumptions.
Can a commercial solar or battery model guarantee savings?
No. Savings depend on actual load, tariffs, export/network conditions, system performance, operations and funding/contract terms. A credible model makes these assumptions visible.
Should IPART certificate value be treated as guaranteed in a tender?
No. Any scheme value must be assessed against current activity rules, eligibility, evidence, timing and the responsible provider’s documented pathway.
What makes two commercial proposals comparable?
Two proposals become comparable when they use the same load-data period, tariff basis, design scope, network assumptions, usable-capacity definition, exclusions, incentive treatment and contractual responsibilities.
Sources and scope
For current NSW Energy Security Safeguard scheme roles and certificate pathways, consult IPART’s Accredited Certificate Provider guidance. For eligible small-scale solar and battery designer/installer requirements, consult the Clean Energy Regulator and Solar Accreditation Australia. Those sources do not replace project-specific legal, commercial, network, engineering or financial due diligence.