Nowadays, the integration of renewable energy sources, especially grid-connected photovoltaic, into electrical power systems, is increasing dramatically. There are several stimulants especially in the Java-Bali power system, including huge solar potential, a national renewable energy (RE) target, regulation support for prosumers, photovoltaic technology development, and multi-year power system planning. However, significant annual photovoltaic penetration can lead to critical issues, including a drop of netload during the day, ramping capability, and minimal load operation for thermal power plants. This study analyses the duck curve phenomenon in the Java-Bali power system that considers high shares of the baseload power plant and specific scenarios in photovoltaic (PV) penetration and electricity demand growth. This study also analyses future netload, need for fast ramping rate capability, and oversupply issues in the Java-Bali power system. The results showed that the duck curve phenomenon appears with a significant netload drop in the middle of the day because of high power generation from grid-connected PV. Furthermore, the need for fast ramp rate capability is critical for a higher peak load combined with the lowest netload valley. Moreover, the significant load growth with high grid-connected PV penetration level caused unit commitment issues for thermal power plants as baseload operators.

Bushing is an important part of power transformer. It is used to insulate the incoming or outgoing conductor into or out of a grounded barrier, in power transformer case is the transformer main tank. The bushings connect the windings of the transformer to the supply line and insulate the feed through conductor from the transformer main tank. From the physical and electrical point of view, bushing appears to be the weakest part of the transformer. The starting of the bushing breakdown process could not be detected easily and could lead to the sudden failure of the bushing, even the failure of the whole transformer. Currently, any time-based-maintenance conducted in PLN P3B Jawa Bali based on manufacturer's manual had been proved not sufficient to recognize any degradation in the bushing. Sometimes it is very hard to find the real root cause of the failure, and getting only the suspected cause of failures. This paper presents some field experiences concerning transformer's bushing failures, along with some facts and findings related to the failure.

This study aims to investigate the factors that influence millennials’ perceptions and preferences in regard to career choices within the state-owned energy sector in Indonesia. The research objective is to understand how to remain competitive in the current disruptive job market by examining a company’s recruitment and retention strategies, and analyzing data collected through econometric surveys. Factors significantly affecting the willingness to work at PLN include its past and present reputation, product societal impact, CSR efforts, and the individual’s gender, age, and job-seeking status, with positive views on PLN and its CSR activities encouraging the inclination to work there. Income expectations are influenced by similar aspects—PLN’s reputation, its product’s societal role, and CSR initiatives—alongside gender and education level, particularly for those with undergraduate or Master’s degrees. Notably, favorable perceptions of PLN and higher educational attainment are linked to increased salary expectations. The results from the survey indicate that a significant proportion of respondents, over 80%, expressed a desire to work at one of Indonesia’s state-owned energy companies (PLN), with a desired monthly salary of IDR 7,466,905. Furthermore, when compared to other state-owned energy companies in Indonesia, PLN holds a strong position, ranking second among this type of companies. This study provides valuable insights for energy companies in Indonesia, by understanding the career preferences of millennials and aligning their employer branding strategies accordingly, in order to remain competitive in the current job market.

Although Gas Insulated Switchgears (GIS) have proven to be reliable for more than forty years, some failures have been reported. In particular, failures due to free particles have been a serious problem for years. The presence of these particles results in a local field concentration which influences the insulation medium and can result in a breakdown. In this paper, the influence of free moving particles on the breakdown strength in GIS under AC voltage, AC + LI (Lightning Impulse) overvoltage and AC + VFTO (Very Fast Transient Overvoltage) has been investigated with the maximum amplitudes of 1.2 p.u., 3.5 p.u. and 2.1 p.u. respectively. Elongated metallic particles with the lengths ranging between 2 to 30 mm have been investigated. The results show that particle with a length of 10 mm and longer were dangerous to the insulation system under continuous operating AC voltage. A breakdown area has been distinguished based on the particles length under AC + LI and AC + VFTO. Particles of 15 mm long were found to be critical under AC + LI, while under AC + VFTO, the 30 mm particle was critical. However, due to limitations in the test setup, the voltage level for LI was 1.4 p.u. higher than for VFTO. The particles detectability have also been investigated by means of partial discharge (PD) measurements of different methods: the conventional method (IEC 60270) :the UHF method : the acoustic method. The PD results have shown that some defects can cause a PD level higher than 10pC. In general, such PD levels are detectable by all methods.