ISP aims to (a) commit the Balancing Capacity needed in the short term and (b) to achieve a schedule that shall meet the technical constraints of the HETS and the Balancing Service Entities based on ex ante estimation of any HETS Imbalances.

All procedures and actions related to ISP shall refer to a specific Dispatch Day D.

The Dispatch Day to which the ISP refers, coincides with the Delivery Day of the Day- Ahead Market and the Intra-Day Market. Dispatch Day D shall start at 01:00 EET of calendar day D and shall end at 01:00 EET of calendar day D +1.

A Dispatch Day consists of individual Dispatch Periods. The duration of each Dispatch Period is set at half an hour. The first Dispatch Period of Dispatch Day D is 01:00 – 01:30 EET.

The ISP shall be executed at three scheduled times:

a) one (ISP1) which shall be executed at 16:45 EET on calendar day D-1 and shall cover all Dispatch Periods of Dispatch Day D,

b) one (ISP2) which shall be executed at 00:00 EET on calendar day D and shall cover all Dispatch Periods of Dispatch Day D, and

c) one (ISP3) which shall be executed at 12:00 EET on calendar day D and shall cover the last twenty-four (24) Dispatch Periods of Dispatch Day D,

The HETS Operator may execute the ISP at any time for all or for certain Dispatch Periods ("ad-hoc ISP”), in the event of an occurrence which significantly affects the scheduling of the Balancing Service Entities and the dispatch of the Balancing Capacity. Such events include but are not limited to, significant changes in the zonal Load Forecast, or zonal RES Units Forecast, or the availability of resources, or the HETS conditions.

The following products shall be used in the ISP:

a) upward and downward Balancing Energy without distinction between mFRR and aFRR;

b) the following Balancing Capacity products:

1. Upward and downward FCR,

2. Upward and downward aFRR, and

3. Upward and downward mFRR.

The submission of Balancing Capacity Offers and ISP Balancing Energy Offers by Balancing Service Providers to the ISP, for Dispatch Day D shall start at 14:00 EET on calendar day D-1 and shall end at 16:45 EET on calendar day D-1. During this time period, the Balancing Service Providers may submit Offers for the Balancing Service Entities they represent, as many times as they wish. Only the last validated Offers shall be taken into consideration in the execution of the ISP.

The Deadline for the Submission of ISP Offers is set at 16:45 EET.

The HETS Operator shall draw up a timetable for the activities governing the actions required for the execution of the ISP, which shall include the actions required during calendar days D and D-1. This schedule is set out in the Technical Decision pertaining to the Integrated Scheduling Process.

Details on the ISP are provided in the Technical Decision: “Integrated Scheduling Process”.