The Top Up and Spill (TUAS) market allows members to purchase electricity from Western Power (the "top up" component) when their production is below the level of their customer demand, and to sell spill electricity to Western Power (the "spill" component) when their production exceeds demand.
The TUAS market is primarily a balancing arrangement providing cost neutral balancing services to IPP's at pre-published prices. Consequently the TUAS market is intended to operate as an alternative to and an extension of the existing balancing arrangements under the ETR/EDR's.
The TUAS market also enables IPP's to intentionally vary their generation from customer load requirements and trade electricity with Western Power where it is commercially attractive to do so. However, this limited trading mechanism has been designed in order to ensure system security. Therefore, TUAS is an important initial step towards the longer-term wholesale electricity market (WEM).
The TUAS market is designed to accommodate the specific requirements of intermittent renewable generators as well as being available to non-renewable generators. However, it is not to be used for the provision of "part-supply" and the quantity of top-up that may be taken by an intermittent renewable generator is limited to the expected annual generator output.
This Page provides links to important information for parties interest in becoming members of the TUAS market.
Top Up and Spill Product Manager
Strategy & Regulation
Networks,
Western Power, 363-365 Wellington Street, Perth, WA, 6000, Australia
Phone : +61 8 9326 6687
Fax : +61 8 9326 6550
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Page update on 9 May 2006
