Site Energy Audit Procedure

Purpose. Sets out how the advisory team conducts an energy audit of a site so that energy use is measured, opportunities are identified and quantified and the recommendations are defensible.

1.Scope and audit levels

This procedure applies to energy audits of GreenLoop sites and client sites. Audits are conducted to the Australian Standard for energy audits at the level agreed in the engagement: a basic audit for an overview, a detailed audit with sub-metering and measured savings, or a precision audit for investment grade decisions. The level, boundary and period must be recorded in the audit plan.

2.Data collection

The auditor must obtain at least twelve months of electricity, gas and fuel invoices and interval data, the equipment register, operating hours, production data and any existing sub-metering. Gaps must be recorded. Data must be entered in the audit workbook with the source of every figure.

3.Site inspection

The auditor must walk the site with the site contact during normal operation and, where practical, outside operating hours to identify base load. Every significant energy using item must be recorded with its rating, operating hours and control method. Temporary logging must be installed where the audit level requires measured data.

• Motors, conveyors, shredders, balers, compressors and pumps
• Lighting and controls
• Heating, ventilation and air conditioning
• Mobile plant and vehicles and their fuel use
• Standby and out of hours loads

4.Analysis

The auditor must build an energy balance that allocates measured or estimated use to each end use and reconciles to the invoices within the tolerance for the audit level. Opportunities must be quantified for energy saved, cost saved, greenhouse gas emissions avoided, capital cost and payback, with assumptions stated.

5.Reporting

The report must include the audit level and boundary, the energy balance, a ranked list of opportunities, the method and assumptions, an implementation plan and the monitoring measures that will verify savings. The report must be reviewed by a second adviser and approved by the Head of Sustainability Advisory before it is issued and recorded in the client projects register.

6.Follow up

Where the client engages GreenLoop to implement recommendations, the savings must be measured against the baseline and reported. For GreenLoop sites, accepted opportunities must be entered in the improvement register with an owner and due date.