> For the complete documentation index, see [llms.txt](https://docs.betterbuilding.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/specification-44/h6p2-energy-usage.md).
# H6P2 Energy usage
H6P2 Energy usage sets the energy value requirement for a building’s domestic services and places a limit on the building’s annual energy use budget based on the societal cost of energy use. This energy value is the Performance Requirements and set for each Class 1 building.
To meet H6P2 requirements, the energy usage of the building is satisfied by complying with Parts 13.6 (13.6.2 Net equivalent energy usage) and 13.7 of the ABCB Housing Provisions for a building with a total floor area not greater than 500 m².
Compliance involves ensuring that the energy usage of a proposed house is equal to or less than the energy use budget (Step 1). A series of calculations are necessary to determine compliance (Step 3).
## **Step 1 - Energy Use Budget**
The energy use budget (allowance) is based on the floor area of the apartment and its location.
The following calculation is used to determine the energy usage of a proposed apartment, where:
$$
A \times EF
$$
* **A (Floor Area Factor)**: Multiply the total floor area by the adjustment factor from Table J3D14a.
* **EF (Energy Factor)**: Obtain this from Table J3D14b.
### Table 13.6.2a Floor area adjustment factor
| Total floor area m² | Floor area factor |
| ------------------- | ----------------- |
| < 50 | 0.0123 |
| 50–59 | 0.0119 |
| 60–69 | 0.0116 |
| 70–79 | 0.0113 |
| 80–89 | 0.0111 |
| 90–99 | 0.0108 |
| 100–109 | 0.0106 |
| 110–119 | 0.0105 |
| 120–129 | 0.0103 |
| 130–139 | 0.0101 |
| 140–149 | 0.0100 |
| 150–159 | 0.0099 |
| 160–169 | 0.0097 |
| 170–179 | 0.0096 |
| 180–189 | 0.0095 |
| 190–199 | 0.0094 |
| 200–209 | 0.0093 |
| 210–219 | 0.0092 |
| 220–229 | 0.0091 |
| 230–239 | 0.0090 |
| 240–249 | 0.0090 |
| 250–259 | 0.0089 |
| 260–269 | 0.0088 |
| 270–279 | 0.0087 |
| 280–289 | 0.0087 |
| 290–299 | 0.0086 |
| 300–309 | 0.0085 |
| 310–319 | 0.0085 |
| 320–329 | 0.0084 |
| 330–339 | 0.0083 |
| 340–349 | 0.0083 |
| 350–359 | 0.0082 |
| 360–369 | 0.0082 |
| 370–379 | 0.0081 |
| 380–389 | 0.0081 |
| 390–399 | 0.0080 |
| 400–409 | 0.0080 |
| 410–419 | 0.0079 |
| 420–429 | 0.0079 |
| 430–439 | 0.0078 |
| 440–449 | 0.0078 |
| 450–459 | 0.0077 |
| 460–469 | 0.0077 |
| 470–479 | 0.0077 |
| 480–489 | 0.0076 |
| 490–499 | 0.0076 |
| 500 | 0.0075 |
### Table 13.6.2b Energy factor (EF)
| **Climate Zone** | **ACT** | **NSW** | **NT** | **Qld** | **SA** | **Tas** | **Vic** | **WA** |
| ---------------- | ------- | ------- | ------ | ------- | ------ | ------- | ------- | ------ |
| 1 | — | — | 1.91 | 2.77 | — | — | — | 3.25 |
| 2 | — | 1.32 | — | 1.78 | — | — | — | — |
| 3 | — | — | 1.23 | 2.46 | — | — | — | 2.87 |
| 4 | — | 1.80 | — | — | 1.86 | — | 1.25 | 2.34 |
| 5 | — | 1.75 | — | 2.28 | 1.79 | — | — | 2.35 |
| 6 | — | 2.40 | — | — | 2.51 | — | 1.63 | 3.20 |
| 7 | 2.56 | 2.33 | — | — | — | 3.08 | 1.62 | — |
| 8 | — | 3.99 | — | — | — | 3.92 | 2.82 | — |
{% hint style="info" %}
This step is automated.
{% endhint %}
### Table 13.6.2c Swimming pool pump factor (FP) (kW/1000 litres.annum)
| **Pool Pump GEMS Star Rating** | **ACT** | **NSW** | **NT** | **Qld** | **SA** | **Tas** | **Vic** | **WA** |
| ------------------------------ | ------- | ------- | ------ | ------- | ------ | ------- | ------- | ------ |
| 1 or unrated | 0.056 | 0.060 | 0.028 | 0.046 | 0.068 | 0.061 | 0.049 | 0.063 |
| 1.5 | 0.048 | 0.050 | 0.023 | 0.039 | 0.057 | 0.052 | 0.041 | 0.053 |
| 2 | 0.041 | 0.044 | 0.020 | 0.034 | 0.050 | 0.045 | 0.036 | 0.046 |
| 2.5 | 0.037 | 0.039 | 0.018 | 0.030 | 0.044 | 0.040 | 0.032 | 0.041 |
| 3 | 0.033 | 0.035 | 0.016 | 0.027 | 0.039 | 0.035 | 0.028 | 0.036 |
| 3.5 | 0.029 | 0.031 | 0.014 | 0.024 | 0.035 | 0.032 | 0.025 | 0.033 |
| 4 | 0.026 | 0.028 | 0.013 | 0.021 | 0.032 | 0.029 | 0.023 | 0.029 |
| 4.5 | 0.024 | 0.025 | 0.012 | 0.019 | 0.029 | 0.026 | 0.021 | 0.027 |
| 5 | 0.022 | 0.023 | 0.011 | 0.018 | 0.026 | 0.023 | 0.019 | 0.024 |
| 5.5 | 0.020 | 0.021 | 0.010 | 0.016 | 0.023 | 0.021 | 0.017 | 0.022 |
| 6 | 0.018 | 0.019 | 0.009 | 0.014 | 0.021 | 0.019 | 0.015 | 0.020 |
| 6.5 | 0.016 | 0.017 | 0.008 | 0.013 | 0.019 | 0.017 | 0.014 | 0.018 |
| 7 | 0.014 | 0.015 | 0.007 | 0.012 | 0.017 | 0.016 | 0.012 | 0.016 |
| 7.5 | 0.013 | 0.013 | 0.006 | 0.010 | 0.015 | 0.014 | 0.011 | 0.014 |
| 8 | 0.011 | 0.012 | 0.006 | 0.009 | 0.014 | 0.012 | 0.010 | 0.013 |
| 8.5 | 0.010 | 0.011 | 0.005 | 0.008 | 0.012 | 0.011 | 0.009 | 0.011 |
| 9 | 0.009 | 0.009 | 0.004 | 0.007 | 0.011 | 0.010 | 0.008 | 0.010 |
| 9.5 | 0.008 | 0.008 | 0.004 | 0.006 | 0.009 | 0.008 | 0.007 | 0.009 |
| 10 | 0.007 | 0.007 | 0.003 | 0.005 | 0.008 | 0.007 | 0.006 | 0.007 |
### Table 13.6.2d Spa pump factor (FS) (kW/100 litres.annum)
| **Spa Pump GEMS Star Rating** | **ACT** | **NSW** | **NT** | **Qld** | **SA** | **Tas** | **Vic** | **WA** |
| ----------------------------- | ------- | ------- | ------ | ------- | ------ | ------- | ------- | ------ |
| All types | 0.067 | 0.071 | 0.033 | 0.055 | 0.081 | 0.073 | 0.058 | 0.075 |
## **Step 2 - Proposed Energy Usage**
The energy usage of a apartment is calculated using several factors, including:
* Floor area of the house or apartment
* Main heating and/or cooling equipment
* Main water heater
* Swimming pool
* Spa
* On-site photovoltaics
The following formula is used to calculate the energy usage of a proposed apartment, where:
$$
(A \times EE) + EP + ES - ER
$$
* **A (Floor Area Factor)**: Multiply the total floor area by the adjustment factor from Table J3D14a.
* **EE (Efficiency Factor)**: Obtain the main space conditioning and main water heater efficiency factor from the ABCB Standard for Whole-of-Home Efficiency Factors.
* **EP (Pool Pump Energy)**: The swimming pool pump energy usage.
* **ES (Spa Pump Energy)**: The spa pump energy usage.
* **ER (Photovoltaics Reduction)**: The installed capacity of on-site photovoltaics .
This calculation provides the total proposed energy usage, which is then compared to the energy use budget for compliance.
{% hint style="info" %}
The factors are detailed in the [ABCB Standard for Whole-of-Home Efficiency Factors](https://ncc.abcb.gov.au/resource/standard/whole-home-efficiency-factors) and a series of lookup tables in the NCC.
{% endhint %}
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