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In human life the use of electrical energy is very important and needed, but over time the use of its consumption is increasing. Therefore, it is necessary to save electricity consumption activities. This effort is known as energy conservation, one of which uses the energy audit method. Energy audit is to calculate the level of use or Energy Consumption Intensity (IKE) in the Untirta Integrated Laboratory Building whether it is efficient in the use of electrical energy. Collecting data related to electricity usage, building profiles, and observing lighting loads, air conditioning/air conditioning loads and other loads. The use of the IKE formula as a form of analyzing the data. The results of the study stated that the IKE value in the Untirta Integrated Laboratory Building was 38.019 kWh/m2, from this value it can be seen that the IKE is efficient. This is based on the parameters used by ASEAN-USAID of 240 kWh/m2. There is an addition in saving energy if in the future there are additional burdens such as laboratory equipment or electronic goods. These savings can be made by using LED lamps and replacing TL lamps or using lamps with a lower wattage than the previous lamp and can be done by reducing the duration of usage in consuming electrical energy.

The hydrogen economy is a shift in the use of fossil energy to energy derived from hydrogen. Currently, Energy experts are trying to find fuel from new and renewable energy, especially in the transportation sector. This study seeks to determine the profile of energy consumption in the city of Semarang, especially in the transportation sector with simulation calculations in a certain year. By knowing the profile of energy consumption in the transportation sector in the city of Semarang, the output of this research is a planning study to build hydrogen economic infrastructure and make possible steps. At the end of this paper, it will be known how big the potential for hydrogen infrastructure development is so that later it can be a guide in determining the right policy in carrying out hydrogen infrastructure development in the city of Semarang. The design capacity of hydrogen production at PT. SAMATOR is 1000 m3/hour. Production breakdown per day : 550 m3/hour x 24hours = 13,200m3. If the production is maximized for 360 days per year, the total hydrogen production in Semarang is 4,752,000m3. In 2020, the demand for hydrogen in the city of Semarang = 1,955,780 m3. With this research data, it can be analyzed that hydrogen production in the city of Semarang can meet the needs of hydrogen for transportation in the city of Semarang.

This study aims to obtain an effective solar panel tracking mechanism using energy-efficient electric actuators. Furthermore, we designed and implemented a semi-active solar tracking system. A tracking system is proposed to control solar panel orientation using a moving mass, a spring system, and an actuator. The weight of the moving mass and the spring constant are optimized to reduce actuator size. A stepper motor was used for this case. This electric drive is not the prime mover of the solar tracker; hence, it works against mass elements lighter than solar panel weight as used in the active solar tracker. Experimental results suggest that the average power required by the stepper motor is 0.21% of the energy generated by the solar tracking system. The results indicate that the proposed solar panel tracker works satisfactorily to control solar panel orientation.