1. In the framework of the ISP, the HETS Operator shall prepare and then publish on its website until 09:30 ΕΕΤ of calendar day D-1 the following forecasts for each Dispatch Period of Dispatch Day D:

   a) The zonal Load Forecasts,

   b) The zonal RES Units Forecasts, which includes the forecast of the Portfolios of non-Dispatchable RES Units and of the Portfolios of Dispatchable Intermittent RES Generation Units,

   c) zonal and systemic upward and downward needs of the HETS in FCR, aFRR, and mFRR.

2. The above forecasts shall be updated by the HETS Operator and shall be published on its website in three programmed time periods:

   a) in the framework of ISP1 at 13:30 ΕΕΤ of calendar day D-1,

   b) in the framework of ISP2 at 21:00 ΕΕΤ of calendar day D-1, and

   c) In the framework of ISP3 at 9:00 ΕΕΤ of calendar day D,

3. The HETS Operator shall keep records of the data and the parameters used for the above forecasts, as well as the results of such forecasts for each calendar year.

4. The HETS Operator shall not be liable for the accuracy of the forecasts it prepares in the framework of its obligations under this Rulebook.

5. The HETS Operator publishes statistical data on the accuracy of the above forecasts within two (2) months from the end of each calendar year. The above data shall be communicated to the RAEWW.

6. The HETS Operator determines the inter-zonal transfer capacity between the internal Bidding Zones and identify the imbalances in the import/export schedules in the interconnections for the execution of the ISP.

7. The HETS Operator publishes on its website the availability of the Dispatchable Generating Units based on their Non-Availability Declarations at 09:30 EET of calendar day D-1, three (3) hours prior to the execution of each scheduled ISP and whenever there is a significant change in availability.

8. The HETS Operator calculates the constraints in the maximum daily energy injection from Dispatchable Natural Gas Units for the total of Dispatchable Natural Gas Units or for individual groups of Dispatchable Natural Gas Units after having received the volumes of the maximum daily Natural Gas consumption from DESFA.

9. The HETS Operator executes the ISP, it shall notify each Balancing Service Provider of the ISP results that refer to the Balancing Service Entities it represents and shall publish the results on its website.

10. Before the end of week W+1, the HETS Operator shall send to the RAEWW details of the minimum variable cost of generation for thermal Dispatchable Generating Units for each day of Settlement Week W. The cost for each thermal Dispatchable Generating Unit shall be calculated, based on the data of the table presented in Article 10.3 of this Rulebook, in accordance with the ‘Methodology for Calculating the Variable Costs of Dispatchable Thermal Units’.

The HETS Operator shall prepare the zonal Load Forecasts for the Dispatch Periods under consideration, taking into account the following information:

a) Historical data on Load Portfolios and statistics deriving from the processing of the historical data, including, but not limited to, the evolution of load per energy use category,

b) the weather forecast, historical data on load under similar weather conditions, comparable statistics, as well as the covariance of load and weather parameters,

c) events that the HETS Operator already anticipates,

d) operations in the HETS and/or the Distribution Network affecting the half-hourly energy offtake at a Transmission Meter, of which the HETS Operator has been informed, and

e) other information collected and notified to the HETS Operator.

The HETS Operator shall prepare the zonal RES Units Forecasts for the Dispatch Periods under consideration, taking into account the following information:

a) historical data on injections of RES Units, as well as statistics deriving from the processing of the historical data,

b) weather forecasts (wind speed, sunshine, etc.), historical data on injections of RES Units under similar weather conditions, comparable statistics, as well as the covariance of RES Units injections and weather parameters,

c) events that the HETS Operator already anticipates,

d) other information collected and notified to the HETS Operator.

The HETS Operator shall determine the zonal and systemic needs in Balancing Capacity for the (a) FCR, (b) aFRR and (c) mFRR, in order to ensure an adequate system response/regulation/reserve within the acceptable limits as established in the HETS Grid Code, taking into account the particular characteristics of the HETS, as defined in the ‘Methodology for Determination of Zonal/Systemic Balancing Capacity Needs’, which is approved by the RAEWW following a proposal by the HETS Operator in accordance with the provisions of paragraph 4 of Article 18 of Law 4425/2016.