The Market Support Services (MSS) Code sets the minimum standards of performance in accordance with which a Market Support Services Licensee is required to perform market support services. The MSS Code also describes the rights and obligations of a Retail Electricity Licensee, a Generation Licensee, the Transmission Licensee and a contestable consumer with respect to market support services. 

The Metering Code sets out the requirements relating to meter specifications, meter data management, etc that the Market Support Services Licensee, and the relevant Electricity Licensees who own meters, must comply with to support settlement under the Market Rules. 

Transmission Loss Factors (TLFs) are scaling factors applied at a metering point for the purposes of accounting for network and transformer losses and otherwise unaccounted-for energy in the electricity distribution system. If such losses were not properly accounted for, settlement errors would result due to a mismatch between injection and withdrawal quantities. Section 6.1.4 of the MSS Code states that the methodology for computing TLFs may be specified by the Authority. TLFs are used in equations in the Metering Code and the MSS Code for purposes of settlement in the wholesale electricity market and determination of electricity charges respectively.

Pursuant to Section 1.6 of the MSS Code and Section 1.7 of the Metering Code, EMA is seeking feedback and comments on the proposed modifications to effect theproposal to exclude on-site loads that are supplied by their own generation from the requirement to pay for transmission losses.