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ENE-2 ENERGY SUB-METERING

Credit Interpretation Request

Energy consumption of a single use unmetered energy load may be deductively calculated

Technical Clarification Number
ENE-2-C-OFF1-1265

Guidance
2016-02-03

The GBCSA confirm that the energy consumption of a single use unmetered energy load may be deductively calculated, and the formula programmed into an automated monitoring system (BMS) to allow for ongoing energy management of the unmetered energy use.

The unmetered load is to be calculated by deducting all metered loads on the same distribution circuit from the primary metered incoming load. The unmetered energy load should represent a single use only.  No other unmetered energy uses may be present on the same distribution circuit.

For the purposes of demonstrating compliance with the above CIR, the following additional documentation requirements are required:

A suitably qualified professional responsible for providing the Automated Monitoring System, shall provide a letter confirming that the automated system has the capability to deductively measure the unmetered load, and describing the programming that will be implemented to meet the credit criteria for the unmetered load.  For As Built ratings the confirmation must be supported by commissioning data, or screenshots of the Automated Monitoring System confirming that the programming has been implemented and is operational.

 

Technical Clarification

Sub-metering lifts

Technical Clarification Number
ENE2-T-OB1-1246

Guidance
2016-01-19

GSSA v1 TM on page 147 states that "Whenever lifts, individually or collectively, carry an energy use greater than 100kVA, they must be sub-metered. If individual lifts carry an energy use under 100kVA, they can be sub-metered individually or as a group; if individually they carry an energy use greater than 100kVA, they must be sub-metered separately unless they are monitored by an intelligent control system."

The above mentioned are options that clarify how to sub meter not whether to sub meter the lifts. The lifts are always to be metered and can be metered via either of the below (for individual lifts that carry an energy use under 100kVA):

- Option to sub-meter individual

- Option to sub-meter as group

Technical Clarification

Allowing alternative compliance for Design rating building, where buildings with a total connected load of less than 100 kVA (maximum demand), metered as a whole and not individually per floor.

Technical Clarification Number
ENE2-T-OB1-0839

Guidance
2014-10-31

Where buildings with a total connected load of less than 100 kVA (maximum demand), separate metering of power and lighting and HVAC is adequate and no further split per floor will be required, the Short report should reflect the following:
• Summary table of the separate metered components
• Describes how energy consumption is effectively monitored during operation
• Where additional point is claimed – project team describe separate metering for power, lighting and HVAC effectively monitoring energy consumption
• Tender schematic electrical drawings are provided reflecting all sub-metering.

 

Erratum

Green Star SA - Office v1 Technical Manual: Page 146

Erratum Number
ENE2-E-OB1-0652

Guidance
2013-03-14

Documentation Requirements on page 146 add the following paragraph:
Extract(s) from the Commissioning Report showing that all the meters and the monitoring system have been commissioned and are operating as intended by the design.

 

Erratum

Green Star SA - Office v1 Technical Manual: Page 146

Erratum Number
ENE2-E-OB1-0454

Guidance
2012-03-14

Documentation Requirements, Description of documentation, 'Tender schematic electrical drawings', delete "loads clearly indicated and".

AND

Documentation Requirements, Description of documentation, 'As built schematic electrical drawings', delete "loads clearly indicated and".

 

Erratum

Green Star SA - Office v1 Technical Manual: Page 145

Erratum Number
ENE2-E-OB1-0300

Guidance
2011-08-08

Credit Criteria, 'Additional Point', 2nd dot point, delete “…or tenancy, whichever is smaller…" and replace with "…for 95% of the total UA only…"

 

Technical Clarification

Amendment of Credit Criteria

Technical Clarification Number
ENE2-T-OB1-0299

Guidance
2011-07-25

The Credit Criteria has been revised such that the additional point is awarded where:

- The first point is achieved;
AND
- It is demonstrated that sub-metering is provided separately for lighting and separately for power for each floor for 95% of the total UA only;
AND
- There is an effective mechanism for monitoring energy consumption data from all energy sub-meters.

This Technical Clarification acknowledges the common existence of minor areas of office UA on predominantly non-office UA floors (i.e. parking or plant floors). Where such areas exist and are cumulatively less than 5% of the office UA, these floors may be excluded from the Credit Criteria.

 

Erratum

Green Star SA - Office v1 Technical Manual: Page 146

Erratum Number
ENE2-E-OB1-0242

Guidance
2011-02-08

Documentation Requirements, documentation table, As Built section, change "As built BMS point schedule" to read "As built BMS/monitoring system point schedule".

 

Erratum

Green Star SA - Office v1 Technical Manual: Page 147

Erratum Number
ENE2-E-OB1-0243

Guidance
2011-02-08

Documentation Requirements, description of documents, change "As built BMS point schedule" to read "As built BMS/monitoring point schedule" (Only BOLD font to be changed, rest of description remains the same).

 

Technical Clarification

Sub meter requirements

Technical Clarification Number
ENE2-T-OB1-0013

Guidance
2009-02-06

Sub meters must measure energy in kWh and need not measure kVA.

 

 

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