The water is very important to human lives. The best and most appropriate way to have an adequate supply of water is to use solar energy to drive pumps instead of using fossil energy. This research was conducted as a comparative study of a conventional submersible AC motor-pump driven by a photovoltaic system using two types of AC motor which are single-phase and three-phase submersible water pumps. The performance of the system was measured according to the standard test procedure in IEC 62253: 2011 while the depth of the well was simulated by an adjustable pump discharge pressure and a pump installed in a predetermined location of 40 meters. The results showed that the three-phase pump supplied more water and has a good response as indicated by a low irradiance of approximately 75 Watt/m 2 in the morning, around 06.15 AM which runs the pump motor effectively while the one-phase pump required a higher irradiance of 750 Watt/m 2 at around 10.30 A.M. Moreover, the PVWPS system with the three-phase pump also had higher efficiency and PR values with 0.64 and 0.40598 respectively than the system with the single-phase with 0.48 and 0.21388.
Electricity subsidies in Indonesia remain high and tend to increase. Existing studies generally propose electricity subsidy reform through economic price adjustment; however, this option potentially arises political and social conflicts. The government and the State Electricity Company have also undertaken several measures to decrease electricity supply costs but those measures remain ineffective due to increasing energy prices needed as fuels for power generations. Our study analyses the effectiveness of two alternative grants for LED lamps and rooftop photovoltaic (PV), to reduce electricity subsidies for low-income residential customers with 450 VA and 900 VA electricity capacity limits. The analysis result is that replacing existing lamps with LED lamps for all those customers will cost the government US$ 313.7 million but potentially decrease electricity subsidies to US$ 208.7 million/ year for 15 years. On the other hand, installing the rooftop PV system is ineffective to bring down the electricity subsidies. The investment cost of the on-grid rooftop PV system is between US$ 827.6 and US$ 1,310.3 per house, while the electricity subsidy savings for 20 years are between US$ 724.1 and US$ 744.8.
Most countries mitigate climate alter impacts by deploying renewable energy to decarbonize their energy system. One of the emerging renewable energy options is the integration of floating photovoltaic (FPV) and hydropower. The FPV has higher efficiency and helps to reduce evaporation and offset hydropower production during the dry season. Conversely, hydropower can overcome intermittent solar production due to its flexibility. Our study aims to estimate the energy potentials from FPV plants and hydropower integrations in Indonesia. As result, the country has 5,807 potential reservoirs for FPV and 26 hydropower plants with a reservoir area with a potential utilization of more than 1 MW. Those sites are suitable for 3 GW floating power plants and 2.8 GW hydropower. And those sites can reduce CO2 emissions by 2,911,197 tonnes per year.
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