Deemed Energy Savings Method

The Deemed Energy Savings Method is used for the installation of common End-User Equipment, such as refrigerators and certain types of high efficiency electric motors.  A program of installing multiple End-User Equipment of the same type is considered a single RESA.

The Deemed Energy Savings Method is a generic approach for measuring the lifetime or 'deemed' savings of an RESA upfront or before the actual savings occurs.

Certificates can be claimed at the time of installation for the deemed lifetime of the RESA, and can be assigned to the Energy Saver.

This method is particularly useful for the capitalisation of lifetime benefits as it provides financial benefits of the RESA at the time of implementation thereby reducing the financial burden of implementing the energy savings measures.

The Deemed Energy Savings Method is designed to provide robust and easy to use equations and factors for the calculation of energy savings arising from the installation of common equipment:

Each of the listed sub-methods is described in more detail below. For more detailed information please refer to the ESS Rule and the ESS Application Guide.

Default Savings Factors

The Default Savings Factors Method for a RESA involves the installation or supply of End-User Equipment types listed in Tables 1 to 8 of Schedule A of the ESS Rule.  This includes the replacement of halogen down-lights with energy efficient alternatives; the sale or purchase of energy efficient clothes washers, dishwashers, fridges or freezers, the retirement of old spare fridges and freezers, and the installation of low flow shower roses. It does not include the installation of compact fluorescent light globes or water flow restrictors.

To determine the number of ESCs that may be created using the Default Savings Factors method involves the simple calculation of the number of activities, multiplied by the appropriate Default Savings Factor, installation Discount Factor and Certificate Conversion Factor.

Commercial Lighting Energy Savings Formula

This Deemed Energy Savings Method is for a RESA that only involves energy savings attributable to commercial lighting upgrades.

This method cannot be used in conjunction with the Project Impact Assessment Method or the Metered Baseline Method.  As outlined in the Act, Energy Savings Certificates cannot be created for the same RESA more than once. There is no double counting.

For example, if End-User Equipment is the subject of a RESA under the Metered Baseline Method which results in Energy Savings due to a commercial lighting upgrade, Energy Savings Certificates can only calculated using the Metered Baseline Method.

An electronic Commercial Lighting Calculation Tool is available on the ESS website for persons to calculate the number of ESCs they may create from a commercial lighting upgrade.  The tool sets out the correct factors and discounts applicable for all eligible types of commercial lighting installations.  As new technologies become available, both the ESS Rule and this tool will updated to take account of new developments.

High Efficiency Motor Energy Savings Formula

This Deemed Energy Savings Method is for a RESA that only involves Energy Savings attributable to the sale or installation of one or more High Efficiency Motors.

This method can not be used in conjunction with the Project Impact Assessment Method or the Metered Baseline Method.  As outlined in the Act, Energy Savings Certificates cannot be created for the same RESA more than once.  For example, if an End-User Equipment is the subject of a Recognised Energy Savings RESA under the Metered Baseline Method, which results in Energy Savings due to a commercial lighting upgrade, Energy Savings Certificates can only be calculated using the Metered Baseline Method.

Power Factor Correction Energy Savings Formula

This Deemed Energy Savings Method is for a RESA that only involves Energy Savings attributable to the reduced losses from the installation of Power Factor Correction (PFC) equipment.

The Electricity Service and Installation Rules of NSW require the power factor of a site to be a minimum of 0.9 lagging. As such, certificates can be generated only by the implementation of PFC which increases the power factor of a site above 0.9 to a maximum of 0.98.