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All Journal Tekinfo | Scientific Journal of Industrial and Information Engineering Jurnal Riset danAplikasi Teknik Industri (JRATI)
Chanysia Feychin Romani
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Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Energy Engineering Environmental Science Industrial & Manufacturing Engineering

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Analisis Perencanaan Penambahan Pembangkit Tegangan Menengah di PT XYZ Chanysia Feychin Romani; I Made Aris Sastrawan
JURNAL RISET DAN APLIKASI TEKNIK INDUSTRI Vol. 3 No. 03 (2025): Volume 03 Issue 03, Desember 2025
Publisher : Study Program of Industrial Engineering, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JRATI.2025.v03.i03.p06

Abstract

The availability of a reliable and sufficient electricity supply is a crucial factor in supporting economic growth and societal activities. PT XYZ, as the state-owned company responsible for electricity generation and distribution in Indonesia, faced challenges in maintaining the balance between electricity supply and demand, including in the Bali region. As electricity consumption continued to increase, proper planning was required for managing the power system, particularly in the medium-voltage subsystem. This study aimed to forecast the peak load for the year 2025 and analyze the need for additional generation capacity in the Bali Subsystem. The method employed was Double Exponential Smoothing (DES), with parameter optimization for α and β using the Solver feature in Microsoft Excel to enhance forecasting accuracy. The data used consisted of monthly peak load values from 2024. The forecasting results indicated that the Solver method produced a peak load estimate of 1,287 MW with a MAPE value of 1.50%, which was more accurate than the initial DES method that yielded a MAPE of 5.91%. Meanwhile, the current generation capacity of 1,388 MW leaves only a 101 MW reserve margin, which is below the minimum safety threshold of 130 MW. This condition highlighted the importance of adding medium-voltage generation capacity to maintain the reliability of the Bali power system in the face of potential disturbances and future demand increases.  
Simulasi Sistem Antrian Pelayanan Take Away di Gerai Minuman Teh Putu Wahyou Widiadnyana; I Putu Reno Swambara Lingga; Ahmad Maulana; Chanysia Feychin Romani; Ni Luh Putu Lilis Sinta Setiawati
Tekinfo: Jurnal Ilmiah Teknik Industri dan Informasi Vol 13 No 2 (2025)
Publisher : Program Studi Teknik Industri Universitas Setia Budi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31001/tekinfo.v13i2.2520

Abstract

An efficient queuing system plays a crucial role in improving service quality and customer satisfaction. Inefficiencies in the queuing system of food and beverage businesses can lead to long lines and decreased customer satisfaction due to prolonged waiting times for ordering. Therefore, addressing queue inefficiencies requires improvements in queuing rules, facilities, or resources. This study investigates inefficiencies in the take-away service queuing system at a tea beverage outlet in a shopping mall in Bali, which results in long waiting times and customer dissatisfaction, especially during peak hours. The objective of this research is to analyze the existing queuing system, identify key bottlenecks, and propose improvements to enhance service efficiency. The method used is system simulation with ProModel, where data is collected through direct observation and time measurements at various service stages. The simulation results indicate that the bottleneck occurs at the cashier counter, causing the average customer waiting time to reach 1,855 seconds. The outlet is only able to serve 71.2% of the total potential customers within three hours. Adding one more cashier counter successfully increased the number of customers served from 88 to 156 within three hours, reduced the average waiting time to 1,340 seconds, and improved processing capacity to 95.31%. In conclusion, the proposed improvements in this study can significantly enhance the efficiency of the queuing system and customer satisfaction at the tea beverage outlet.
Co-Authors Ahmad Maulana I Made Aris Sastrawan I Putu Reno Swambara Lingga Ni Luh Putu Lilis Sinta Setiawati Putu Wahyou Widiadnyana