A power system can be said to be reliable if it has a high continuity of service. To achieve this, an operational arrangement is required to optimize installed power to supply the load to avoid overloading or over-supply of the system. Modjopanggoong Sugar Factory Tulungagung is one of the sugar producing industries, where the electrical system in this factory uses two power supply, which is using PLN supply and Turbine Generator Boiler (BTG). The use of more than one power supply resulted in an increase in the required electricity production costs. To solve this problem, in this research will be conducted a study to make efficient of electrical energy cost which is done by arranging supply of electric energy, that is using maximum supply of BTG and its deficiency supported PLN supply (alternative I), using PLN maximum supply and its deficiency is supported BTG supply alternative II) and only use PLN supply (alternative III). The results showed that energy efficiency can be done with the regulation of energy supply at the factory, that is in alternative I with savings Rp.430.025.007 (2.1%), alternative II with savings of Rp. 553,984,815 (2.7%), and alternative III with savings of Rp. 2.055.727.407 (10%).

The unbalanced load on distribution transformers is mostly caused of connecting new customers and changing patterns of electricity usage in the community. The impact of the unbalanced load is the emergence of a current flowing on the transformer neutral conductor that causes energy losses. Load balancing of distribution transformers is commonly done by technicians, but the implementation takes quite a long time and is repeated, sometimes up to 4-5 times to get the appropriate results. This is more due to less valid customer phase data. Customer phase verification is needed to accelerate the load balancing process in an effort to reduce losses in distribution transformers. With valid customer phase data, just one stage of load balancing can reduce losses by 1.06%..

At PT. PLN (Persero) ULP Batu, Pujon feeder is one of the 9 feeders in the distribution system that supplies severalareas in PT. PLN (Persero) ULP Batu. At the Pujon feeder, the number of disturbances that occurred from January to November 2021occurred twenty-two times, with details of eighteen temporary disturbances and four permanent disturbances. The number of disturbancesthat often occur can affect the feeder who is working normally. This can cause voltage drops and power losses, causing the flow of electricpower to be less than optimal and detrimental to customers or consumers. Because it requires maneuvering so that the disturbance does notspread to all feeders and cause one feeder to experience a blackout. Based on the problems that occur, maneuver analysis is needed toreduce the impact of disturbances on the Pujon feeder and to maintain the reliability value of the distribution system at PT. PLN (Persero)ULP BATU.

Maintenance and repair of household electrical appliances for the Rukun community Residents 09 Bunulrejo Village / Kec. Blimbing - Malang City, gives additional the skills and motivation for the Rukun Community of 09 Bunulrejo Village for practice maintenance and repair of household electrical appliances for the Rukun community Residents 09 Bunulrejo Village. Besides that it can also improve skills addition to the community of Rukun Warga 09 Kelurahan Bunulrejo in the field of care and repair of household electrical appliances for the 09 Rukun Warga community in the Village Bunulrejo that applies in this era.

This study discusses the installation of lighting electrical installations that are appropriate and safe for the communityassisted by the Manpower Office in Malang City Government. The existence of this research is expected to provide additional skills ininstalling lighting installations, to be used in working to install lighting installations that are correct and safe and in accordance withstandards, so as to minimize work hazards or accidents due to errors due to installation and use. This research activity was carried out inthe AK Building of Malang State Polytechnic, Jalan Soekarno Hatta Malang by Malang State Polytechnic. The research activity forlighting electrical installations was carried out using a direct practice method. These activities are the introduction of standard electricalinstallation equipment according to PUIL; Introduction of lighting equipment components such as lamps, switches, contact boxes; andInstallation of fittings, contact boxes, pipes, cables, switches. From the results of the research which was carried out for several days, theresults obtained were knowing the practical theory of lighting installation; know the use of PPE properly; know the components of thelighting installation; know the electric measuring instruments; knowing how to install lighting installation components correctly and safely;know what things are done before the object is connected to a power source; and can take measurements when the object has beenconnected to a power source.