Methods of providing this value: This value can be provided from instrument devices at the resource site or it may be calculated from other measured points as agreed to by the CAISO RIG Engineer (i.e., Gross MW minus Aux MW = Net MW). If Gross MW is equal to Net MW then Net MW is not required. Unit of delivery Megawatts (POD MW) Definition: This quantity is defined as the compensated, real-time value of the resource’s real power output at the point the resource connects to the electric grid to the CAISO Controlled Grid. It should align with the Point-of-delivery (POD) MW calculated or measured by the CAISO revenue meters. This value is either the actual or calculated value of the unit’s output at the point where the Generating Unit connects to the electric grid into the CAISO Controlled Grid. It must be a real time updated value and not averaged over time. This value is compensated for losses typically arising from the difference between the measured point and the delivery point (such as transformer losses, line losses, etc.). Purpose: POD MW is used to certify Ancillary Services and represents the Generating Unit’s real power delivery to the system. It is used to validate Ancillary Services Bids (scheduled versus actual) and to calculate accurate Operating Reserves. This point is also used as an input to real time network model used for system reliability monitoring. Methods of providing this value: This value may be obtained by installing instrument devices at the POD. This value may also be calculated by providing an accurate conversion of existing Net MW values to point of delivery values within the existing control system or external system. The value must represent an accuracy of +/-2% of the true value of POD MW represented in the CAISO revenue meter. Auxiliary Load Megawatts (Aux MW) Definition: Aux MW is defined as the real power load the Generating Unit provides to maintain its station service power. This point is required where a unit’s maximum auxiliary load is 1 MW or greater. Aux MW cannot represent other loads between the Generating Unit and the POD. Purpose: The CAISO uses this value to determine the amount of replacement power required by each Generating Unit based on unit trips, startups, etc. This value is used to properly model the Generating Unit’s operating condition. Methods of providing this
Methods of providing this value: This value can be provided from instrument devices at the resource site or it may be calculated from other measured points as agreed to by the CAISO RIG Engineer (i.e., Gross MW minus Aux MW = Net MW). If Gross MW is equal to Net MW then Net MW is not required. Unit of delivery Megawatts (POD MW) Definition: This quantity is defined as the compensated, real-time value of the resource’s real power output at the point the resource connects to the electric grid to the CAISO Controlled Grid. It should align with the Point-of-delivery (POD) MW calculated or measured by the CAISO revenue meters. This value is either the actual or calculated value of the unit’s output at the point where the Generating Unit connects to the electric grid into the CAISO Controlled Grid. It must be a real time updated value and not averaged over time. This value is compensated for losses typically arising from the difference between the measured point and the delivery point (such as transformer losses, line losses, etc.). Purpose: POD MW is used to certify Ancillary Services and represents the Generating Unit’s real power delivery to the system. It is used to validate Ancillary Services Bids (scheduled versus actual) and to calculate accurate Operating Reserves. This point is also used as an input to real time network model used for system reliability monitoring. Methods of providing this value: This value may be obtained by installing instrument devices at the POD. This value may also be calculated by providing an accurate conversion of existing Net MW values to point of delivery values within the existing control system or external system. The value must represent an accuracy of +/-2% of the true value of POD MW represented in the CAISO revenue meter. Auxiliary Load Megawatts (Aux MW) Definition: Aux MW is defined as the real power load the Generating Unit provides to maintain its station service power. This point is required where a unit’s maximum auxiliary load is 1 MW or greater. Aux MW cannot represent other loads between the Generating Unit and the POD. Purpose: The CAISO uses this value to determine the amount of replacement power required by each Generating Unit based on unit trips, startups, etc. This value is used to properly model the Generating Unit’s operating condition. Methods of providing this
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