Stage: II (Review) Status: Complete Date commenced: 01/02/2011

We released a report on events surrounding plant being constrained on in late January 2011, particularly Huntly Unit 5 on 23-27 January 2011.

On 11 February 2011, we received a letter from the System Operator answering six questions asked on 1 February 2011.

On 22 February 2011, we received a letter from Contact Energy expressing concern at the magnitude of constrained-on payments for January 2011.

On 23 February 2011, we went back to the System Operator with an additional four questions. The System Operator sent us a letter answering those questions on 28 February 2011.

On 2 March 2011, we received a letter from Genesis Power answering four questions asked on 28 January 2011.

On 18 March 2011, we received a letter from Mighty River Power expressing concern at the magnitude of constrained-on payments for January 2011.

The System Operator sends a daily report to the Market Administrator each day just after 7:00am. The daily report covers the previous 24-hour period and provides a comprehensive list of potential breaches of the code, adjustments to the pre-dispatch schedule, discretionary action, and block and station security constraint notices issued by the System Operator. The 26 January 2011 daily report is presented below as an example.