Wheeling Charge Calculation with Consideration of Investment Lifetime and Power Transaction Locations

Abstract

In Thailand, Small Power Producers (SPPs), ranging from 10 to 90 MW, mostly use state-owned transmission and sub-transmission systems to transfer their electrical power to customers. This may result in an additional investment of transmission and sub-transmission systems. Consequently, the transmission and sub-transmission utilities tend to collect “wheeling charge” from power transactions between SPPs and their customers for recovering the transmission and sub-transmission systems investment costs. The objective of this paper is to analyze the wheeling charge results by using a Power Flow Based MW-Mile method on a PEA’s sub-transmission system; namely, the C1_BIC-NVC_LL_Job_10 115-kV system. Also, the paper considers the impact of the incoming SPPs locations, the additional investment during wheeling charge collecting period, and the impact of line loading of the demonstrated system. The results show that the difference in locations of power transactions can cause the difference in wheeling charge results.