ISLAMABAD: The National Power Control Centre (NPCC), the System Operator (SO), has reported 96 deviations from the Economic Merit Order (EMO) under the guise of security-constrained economic dispatch for August 2024.
In a monthly report submitted to the National Electric Power Regulatory Authority (NEPRA), General Manager Engineer Nasir Ahmed noted that nine thermal power plants operated with these deviations during the month. This report on deviations in EMO is part of public hearings and discusses the financial impact on consumers.
According to NPCC, China Hubco was curtailed 29 times, violating the Economic Dispatch Criteria (ECP), resulting in approximately 48.64 GWh of curtailed energy, or 0.0037% of total energy. Other deviations included Lucky (8 deviations, 12.09 GWh), Port Qasim (18 deviations, 25.44 GWh), Nandipur (28 deviations, 16.11 GWh), FKPCL (5 deviations, 1.41 GWh), Hubco (Narowal, 1 deviation), Liberty Tech (3 deviations), Thar Energy (2 deviations), and Thal Nova (2 deviations).
In total, these 96 deviations from the EMO resulted in 107.05 GWh of curtailed energy, constituting 0.4455% of the total energy for the month.
NPCC asserts that these deviations were consistent with Grid Code OC 7.5.1 and 7.5.9, which govern HVDC transmission system operations. According to OC 7.5.1, the HVDC system must operate harmoniously to ensure optimal performance of the integrated AC and HVDC transmission systems. OC 7.5.9 requires that fast generator and/or load tripping (SCS) strategies be developed as necessary to prevent angular instability in mono/bipole blocking. Ends
