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New and renewable energy is one of the hot issues discussed by various energy experts in many countries. As a country that has enormous renewable energy potential, Indonesia has not utilized it optimally. One of the reasons is the inadequate learning of new and renewable energy in schools and colleges. This article will discuss the design and implementation of a Trainer Kit for Hybrid On-Grid Solar Power Generation System (TK-HOGS). With this Trainer Kit, it is hoped that vocational education students will increase their competence in new and renewable energy. This study uses a research and development approach that adopts the ADDIE model. The development stages include Analysis, Design, Development, Implementation, and Evaluation. The results showed: (1) The TK-HOGS can produce an average power of 22.74 Watt with an estimated electrical energy of 136 WH and (2) Media experts and electric power engineers stated that this TK-HOGS is “Very Good” and very suitable to be used to help lecturers in carrying out learning.

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PT Barata is one of Indonesia’s leading turbine component manufacturers, requiring a large amount of electricity for production. Along with the increase in production and factory expansion, the need for electricity continues to increase so that it continues to add power to reach 3780 KVA. One of the weaknesses of the electric power system at PT Barata is using six (6) 20kV/400 V, 630 kVA transformer units. This system produces a no-load or core loss of 8150 Watts. In one year, the power loss reached 71.394 kWh at the cost of IDR 118,514,040.00. Power loss is permanent and lasts all the time during the use of the Transformer. This article aims to redesign the electrical system at PT Barata using a single 4000 kVA transformer. The redesign of the electric power system at PT Barata was carried out by 1. Observing and measuring the electric power system at PT Barata, 2. calculating the resulting losses, 3. conducting studies and designs, 4 comparing the ratio of the total power loss of the electric power system currently with a new design, 5. Propose a redesign to management for implementation. Calculation and analysis of the new design with a 4000 kVA transformer obtained a core loss of 4450 Watt at the cost of Rp. 64,905.030.00, resulting in a savings of IDR. 53,965,980.00 per year. The new design will save 45% in operating costs compared to the previous six transformer units.