In the period from 2nd to 3rd of May 2013 technical problems caused by control technology occurred in the control area of APG. This also affected the supply of secondary control for the control area of APG.
To balance the deficit of secondary control and ensure network safety, APG requested prequalified suppliers to substitute the lack of secondary control. This request for additional supply of 45 MW took place on Thursday, 2nd of May from 08:00 pm to 00:00 am. This period was extended from 00:00 am to 08:00 am on 3rd of May and finally continued from 08:00 am to 08:00 pm on that day for 30 MW (change of product).