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Abslruct: Network losses are being considered in the Standard Market Design.The calculation of loss sensitivity that is based on the distributed generator slack is commonly used for economic dispatch in energy control center. In order to obtain the accurate locationbased marginal prices, an efficient and robust method to calculate loss sensitivity for an arbitrary slack within the real-time period (1-10 minutes) is needed in the realtime energy markets. This paper presents a fast and useful formula to calculate loss sensitivity for any slack bus. This formula is based on the results from the distributed slack without repeating the traditional power flow calculation. The loss sensitivity calculation is tested and verified.