Often the MO will also be responsible for recovering the costs associated with any party defaulting on its obligations to make payments to the wholesale market (such defaults usually arising because of insolvency). In these circumstances relatively large sums may need to be recovered through MO charges. This does not necessarily have implications for the structure of MO charges, but emphasizes the importance of the MO adopting best commercial practices in the management of credit risk.

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There are two categories of cost usually associated with system operation – the administrative costs of the SO and the additional costs that system operation imposes on the market. The administrative costs of the SO are usually relatively small while the market-based costs can be relatively large. These market-based costs can include the costs of:

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