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The electricity cost accounts for about 4% of the annual turnover of Company F. According to the study, the saved electricity cost has been over 10 million NTD accumulatively in recent 8 years. The current total charge of Taiwan Power Company consists of 5 parts including basic charge, energy charge, power factor clause, penalty charge and others. Based on the actual electricity consumption data of Company F, this study conducted regression and variation analyses with SPSS statistical software and found out the effects of optimized contract capacity and time-of-use on electricity cost.
The results show that: contract capacity is positively related to basic charge, unrelated to energy charge, negatively related to power factor clause, inversely proportional to penalty charge and quadratically related to payable total charge. The lowest position is found out, namely, the optimized contract capacity and the minimum payable total charge. The payable total charge has significant effects on contract capacity and basic charge and penalty charge. It is more advantageous for Company F to choose 3-secion time-of-use than the 2-secion time-of-use, but affected by the policy of “one regular leave day and one rest day”, the difference of time-of-use becomes insignificant.
Because the optimized contract capacity is stable in recent 3 years, Company F is suggested to reduce the original contract capacity of 2,880 KW to 2,500 KW. In this way, the basic charge of about NTD 847,000 may be reduced, but the penalty charge may be occured in summer. It is expected that this study can be helpful for enterprises to optimize contract capacity and choose time-of-use.
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