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Performance measurement of transmission system is vital to proper planning and operations of power systems in the presence of deregulation. Degree of performance is often measured by technical and financial key performance indicators (KPIs) often determined by unavailability, quality of supply and energy lost. This paper implement a novel method, Hybridized continuous repeated power flow (HCR-PF) to compute inter-area ATC and gives a method based on computed ATC to determine the transmission efficiency by measuring the transmission system transfer efficiency in terms of available transfer capability. Available Transmission Transfer Efficiency (ATTE) expresses the percentage of real power received resulting from inter-area available power transfer. The results show that HCR-PF provides a good approximate alternative to ATC computation which is validated using IEEE 30 bus test network. The Tie line (physical path) performance is obtained by calculating the required sending end quantities with specified receiving end ATC and the receiving end power circle diagram.

Available Transfer Capability (ATC) as Index for Transmission Network Performance – A Case Study of Nigerian 330kV Transmission Grid