Saudi Arabian Grid Code May 2024

Planning of Transmission System Outages 4.3.5.1 The procedure set out in this subsection shall be followed in each calendar year for planning of Transmission System Outages (see Figure 4.3 below). Figure 4.3. Program Horizon for Transmission System Outages 4.3.5.2 The TSP shall plan Transmission System Outages required in Years 2 and 3 as a result of construction or refurbishment works taking due account of the known requirements. The planning of Transmission System Outages required Year 2 and Year 3 Indicative Outage Program For Year 1 Provisional Outage Program March till end -Year 0 Committed Outage Program Chapter 4 - Operating Code The Saudi Arabian Grid Code Updated Version: May 2024 in Years 0 and 1 ahead will, in addition, take into account Transmission System Outages required as a result of maintenance. 4.3.5.3 Transmission System Outages and Generating Unit Outages shall, during Years 2 and 3 but not in Year 1 or before, be coordinated so that, in general, the Generating Unit Outages shall take precedence over Transmission System Outages but subject always, in any particular case, to the TSP discretion to determine otherwise on the basis of reasons relating to the proper operation of the Transmission System. 4.3.5.4 Indicative Outage Planning – Planning for Year 2 and 3 By the end of September Year 0, the TSP will draw up a draft Transmission System Outage Program covering the period Years 2 and 3 for TSP’s internal use and will notify each User in writing of those aspects of the draft plan which may operationally affect such User including, in particular, proposed start dates and end dates of relevant Transmission System Outages. The TSP will indicate to a Generator where a need may exist to use inter-tripping or other measures including restrictions on the Scheduling and Dispatch of Generating Units to allow the Security of the Transmission System to be maintained within the statutory or regulatory requirements. 4.3.5.5 Provisional Operational Planning - Planning for Year 1 The plan produced pursuant to (4.3.5.4) will become the draft Transmission System Outage Program for Year 1 when, by the passage of time, Year 2 becomes Year 1. Each calendar year, the TSP shall update the draft Transmission System Outage plan and shall, in addition, take into account Outages required as a result of maintenance work. (i) By the end of June Year 0, the TSP will draw up a draft Provisional Transmission Outage Program and will inform each User of any potential restrictions which may affect it and generally the impact on the Transmission System in Year 1. The draft Provisional Transmission Outage Program shall take into account the conditions of the Connection Agreement of each NPP which are related to Nuclear Safety Analysis. Chapter 4 - Operating Code The Saudi Arabian Grid Code Updated Version: May 2024 (ii) Where a User objects to the proposed restrictions or impact notified to it in (i) above, equivalent provisions to those set out in (4.3.4.5[ii]) will apply. (iii) Between the end of June and the end of September Year 0, the TSP will draw up a final Transmission System Outage Plan covering Year 1. (iv) By the end of September Year 0, the TSP will issue the final Transmission System Outage Plan for Year 1. The TSP will notify each User in writing of those aspects of the plan which may operationally affect that User including, in particular, proposed start dates and end dates of relevant Transmission System Outages. The TSP will also indicate where a need exists to use inter-tripping, emergency switching, emergency load management, or other measures including restrictions on the Scheduling and Dispatch of Generating Units to allow the Security of the Transmission System to be maintained within allowable limits. 4.3.5.6 Committed Outage Planning - Year 0 down to the Programming Phase The Transmission System Outage plan for Year 1 issued under section (4.3.5.5) will become the Committed Outage Program for Year 0 when by the passage of time Year 1 becomes Year 0. 4.3.5.7 Nuclear Safety shall be the first concern of the Programming Phase. 4.3.5.8 Programming Phase (i) By 14:00 hours each last day of business week, the TSP shall update the Transmission System Outage plan for the following one (1) week period beginning on the first day of business week. (ii) The TSP will notify each User in writing of those aspects of the plan which may operationally affect such User including in particular proposed start dates and end dates of relevant Transmission System Outage. The TSP will also indicate where a need exists to use inter- tripping, emergency switching, emergency load management, or other measures including, restrictions on the Dispatch of Generating Units to allow the Security of the Transmission System to be maintained within allowable limits. Chapter 4 - Operating Code The Saudi Arabian Grid Code Updated Version: May 2024 (iii) During the Programming Phase, the User and the TSP will inform each other immediately if there is any unavoidable requirement to depart from the Outage Plan and actions determined and notified under this subsection.