In January 2015, we asked the system operator to review the instantaneous reserve markets. The objectives were to determine whether the current markets for fast and sustained instantaneous reserve could be combined into one single market and whether new product definitions could be introduced to replace the current products for fast and sustained instantaneous reserve.
In its report, the system operator recommended the Authority undertake more detailed economic and technical analysis on two new methods to procure under-frequency reserve:
- area under the curve—a fast instantaneous reserve product based on the average response of the instantaneous reserve provider over the first 6 seconds
- purchasing sustained instantaneous reserve on less than a 1:1 basis (the system operator currently purchases a quantity of sustained instantaneous reserve that equals the largest risk).
The system operator’s initial analysis suggests that these new methods could reduce the amount of instantaneous reserve purchased, while maintaining the electrical system reliability.
We will undertake the work recommended by the system operator during the 2015/16 financial year.
We will also investigate the feasibility of a Scheduling Pricing and Dispatch-based solution for procuring instantaneous reserve.
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