Saudi Arabian Grid Code May 2024

Issuance of Generation Schedule 5.3.7.1 The TSP shall issue the Generation Schedule by 15:00 hours each day for the next following Schedule Day, providing that it gets all the necessary information by 10:00 hours. However, if during the period in which the Generation Schedule is being prepared, Incidents on the System (for example, loss of Generation in a critical part of the System) occur which require a substantial amendment to the data being used in preparing the Generation Schedule, the TSP may extend the timescale for issuing of the Generation Schedule to the extent necessary as a result of such Incidents. The TSP shall also issue each update of the Generation Schedule as a result of a new declaration made by the Saudi Sustainable Energy Control Center on behalf of any Renewable Resource Generation. 5.3.7.2 The TSP may inform Generating Units before the issue of the Generation Schedule for the Schedule Day to which the Instruction relates, if the length of Notice to Synchronize requires the Instruction to be given at that time. When the length of the time required for Notice to Synchronize is within thirty (30) minutes of causing the Generating Unit to be unable to meet the indicative Synchronizing time in the Generation Schedule or a subsequent Dispatch Instruction, the Generator must inform the TSP without delay. 5.3.8 Negative Minimum Demand Regulation (NMDR) 5.3.8.1 Synchronized Generating Units shall at all times be capable of reducing output sufficient to offset the loss of the largest secured Demand on the System and shall be capable of sustaining this response. Sustainable Resource Generation shall only be chosen for reducing output if no other unit is available. The TSP will monitor the output data of the Generation Schedule against Forecast Demand to see whether the level of NMDR is sufficient. Where the level of NMDR for any period is insufficient, the TSP may contact all Generators in relation to their relevant Generating Unit/Station in the case of low NMDR and will discuss whether: (i) any change is possible to Generating Unit inflexibility; and/or Chapter 5 - Scheduling and Dispatch Code The Saudi Arabian Grid Code Updated Version: May 2024 (ii) any change is possible in declared Availability of a Generating Unit which has been notified to the TSP. 5.3.8.2 In the event that the TSP is unable to differentiate between Generating Unit Costs, the TSP shall instruct a Generator to Shutdown a specified Generating Unit based upon the following factors: (i) effect on Power flows (resulting in the minimization of Transmission System losses); (ii) reserve capability; (iii) Reactive Power worth; and (iv) in the case of localized NMDR, the effectiveness of output reduction in the management of the System constraints. (v) a Sustainable Resource Generation shall only be chosen for Shutdown if no other unit is available. 5.3.9 Inadequate Operating Margin 5.3.9.1 In the period following 10:00 hours each day and in relation to the following Schedule Day, the TSP will monitor the output data of the Generation Schedule against Forecast Demand and the Operating Margin to see whether the anticipated level of the Operating Margin for any period is insufficient. 5.3.9.2 Where this level for any period is anticipated to be insufficient, the TSP will send a Notification of Inadequate Operating Margin (NIOM) to each Generator and Distribution Entity. The NIOM will indicate the insufficiency and the period for which the insufficiency is anticipated. 5.3.9.3 The monitoring will be regular and revised NIOMs may be sent out from time to time. These will reflect any changes in declared Availability which have been notified to the TSP, and will reflect any Demand Control which has also been so notified. They will also reflect generally any changes in the Forecast Demand and the relevant Operating Margin. Generation Dispatch