Market Operator Service (MOS) costs are costs incurred by a Short Term Trading Market (STTM) pipeline service provider in balancing positive or negative pipeline deviations at the STTM hub at the end of each gas day.
The National Gas Rules allow an STTM pipeline operator to recover MOS allocation service costs by providing the Australian Energy Market Operator (AEMO) with a tax invoice of those costs incurred during that financial year. After a short period of consultation, AEMO provides the invoices to the AER in order for us to determine the amount payable to each STTM pipeline operator.
The 2012-13 tax invoices are available on the AEMO website at:
In accordance with rule 425 of the NGR, we reviewed the costs specified in each tax invoice and consider that the costs claimed have been incurred for MOS allocation services and are reasonable. Therefore, we determine the amount specified in each tax invoice to be the amount payable to each STTM pipeline operator.