Certificate Volume and Value Estimator | Knowledge Base

Overview

A calculator that estimates the volume and dollar value of energy efficiency certificates available for a heat pump water heater under the primary Australian incentive schemes: SRES (STCs), VEU Activity 44 (VEECs), and ESS HEAB (ESCs). The user inputs product performance data, climate zone or state, and a deployment scenario (number of units), and receives per-unit and total certificate estimates with a breakdown by scheme.

The primary use is client-facing: a manufacturer or importer asking “what is my product worth in certificates?” This is one of the first questions asked in any scheme registration scoping conversation and the tool should make it self-service.

The outputs must be clearly caveated as estimates — actual certificate entitlement depends on the final test results, scheme registration terms, and methodology definitions at time of registration.

User Stories

As a manufacturer exploring the AU market, I want to understand the indicative certificate value of my product before committing to testing and registration costs so I can assess the business case.
As a distributor negotiating with a manufacturer, I want a certificate value estimate I can reference in commercial discussions so I know what the incentive income looks like.
As an EnergyAE consultant, I want to run a certificate estimate during a discovery call and show the client a table of schemes and values so I can immediately demonstrate what’s at stake.
As a manufacturer running a business case, I want to enter a deployment volume (e.g. 500 units per year) and see the total annual certificate income so I can include it in a financial model.
As a user, I want to see how certificate values change across different climate zones so I can understand regional variation in incentive income.

Schemes Covered

SRES — Small-scale Technology Certificates (STCs)

Administered by the Clean Energy Regulator
STCs are assigned based on the product’s zone energy factor under AS/NZS 4234
Number of STCs per unit depends on the zone energy factor, the comparison factor, and the number of years remaining in the STC deeming period
STC deeming period reduces by one year each year — currently deeming to 2030.
STCs per unit also varies by climate zone (products perform better in warmer zones but may have fewer STCs due to lower comparison factor — Alastair to confirm the exact relationship)

VEU Activity 44 — Victorian Energy Efficiency Certificates (VEECs)

Administered by the Essential Services Commission Victoria
VEECs are calculated from annual energy savings relative to a baseline water heater (defined in the Activity 44 methodology)
Applicable to both residential and commercial heat pumps
Certificate entitlement per unit is fixed at registration based on the AS/NZS 4234 simulation for the product
Alastair to confirm the exact VEEC calculation methodology and any annual variation

ESS HEAB — Energy Savings Certificates (ESCs)

Administered by IPART / NSW ESC
ESCs calculated from annual energy savings per the HEAB method
Applicable to commercial HPWH only (confirm with Alastair)
ESC calculation methodology differs from VEU methodology and may produce different certificate volumes for the same product

Inputs

Product performance data

Sourced from the product database (preferred) or entered manually:

Product type: residential / commercial
Tank volume (litres)
AS/NZS 4234 zone energy factor per climate zone (if available from the residential simulation tool)
COP vs ambient temperature curve (if zone energy factors not available, estimated from COP data)
Rated heating capacity (kW)

If zone energy factors are not available, the tool uses the COP data to estimate them with a clearly displayed disclaimer: “Zone energy factors estimated from performance data. Run the AS/NZS 4234 simulation for more accurate results.”

Deployment scenario

Target climate zone(s) or state(s): single zone / all zones / by state
Annual deployment volume (units per year)
Deployment period (years, for cumulative calculation)

Certificate price inputs

Current certificate prices are volatile and the tool cannot reliably auto-fetch live prices. User enters:

STC price ($/certificate) — platform shows a reference range with a “last updated” timestamp
VEEC price ($/certificate) — platform shows a reference range
ESC price ($/certificate) — platform shows a reference range

Alastair to decide whether to maintain a manually updated reference price display or integrate a live price feed. A manually updated display is simpler for v1.

STC deeming period

The STC deeming period reduces by one year on 1 January each year, which directly reduces STCs per unit. The tool must use the current deeming period and show how per-unit STCs change over the next 3 years.

Outputs

Per-unit certificate summary

Table showing estimated certificates per unit for each applicable scheme:

Scheme	Certificates per unit	$/unit at entered price	Notes
STCs (SRES)			Climate zone, deeming period
VEECs (VEU A44)			Based on zone energy factor
ESCs (ESS HEAB)			Commercial only

Deployment scenario outputs

Total certificates per year (at entered deployment volume)
Total dollar value per year (certificates × entered price)
Breakdown by scheme
Cumulative certificates and value over deployment period

Climate zone comparison (for SRES)

Bar chart showing STCs per unit by climate zone, with indicative dollar value per zone. Helps identify which climate zones are most valuable for a sales strategy.

Deeming period impact table

Table showing how per-unit STCs reduce as the STC deeming period decreases over the next 5 years. Makes the case for acting soon.

Year	Deeming years remaining	STCs per unit	$/unit at $XX.XX
2026
2027
2028
2029
2030

CER round information (SRES)

A note showing the current CER round schedule (submission windows, audit periods, finalisation dates) so the user can plan when STCs will be finalised and paid. Links to the CER round timeline tracker feature.

Disclaimer and Caveats

All outputs must be clearly labelled as estimates. The following caveats must be displayed prominently:

“STC and VEEC entitlements are based on the product’s AS/NZS 4234 zone energy factors. If zone energy factors are estimated from COP data rather than a confirmed simulation, actual entitlements may differ.”
“Certificate prices are user-entered and volatile. Actual income depends on market prices at the time of sale.”
“STC deeming period reduces each year. All STC estimates assume registration occurs in the current calendar year.”
“ESS HEAB estimates are indicative and subject to IPART assessment methodology. Consult EnergyAE for a detailed ESC assessment.”

Out of Scope (v1)

Live certificate price feed (manual user-entry in v1)
NZ EECA calculation
State-specific rebate calculations
Solar water heater certificate comparison
Certificate trading or broker comparison
Integration with scheme administrator portals for live product data

Data Model (indicative)

certificate_estimates
  estimate_id
  product_id (nullable)
  user_id
  created_at
  input_product_data (JSON)
  input_deployment_scenario (JSON)
  input_certificate_prices (JSON)
  output_per_unit (JSON: per scheme certificates and dollar value)
  output_deployment_scenario (JSON: total certificates, total value, breakdown by scheme)
  scenario_label (nullable)

Acceptance Criteria

Open Questions

Does the VEU Activity 44 methodology use the same AS/NZS 4234 zone energy factors as the STC calculation, or does it define its own climate zones and annual performance calculation? Alastair to clarify — this is critical for knowing whether one simulation feeds both calculations.
ESS HEAB eligibility for residential products: is this commercial only, or are there any residential scenarios where ESCs apply? Alastair to confirm.
Should the tool show a sensitivity analysis (e.g. how do total certificates change if deployment is 300 units vs 500 units vs 1000 units)? A simple volume slider would add significant value without much development complexity.
What is the appropriate reference price to show for each certificate type? Alastair to decide and commit to updating these at regular intervals.
CER round tracker integration: should the CER round dates shown in this tool be pulled from a shared data source with the CER round tracker feature, or maintained separately?