Rural electrification and optimization of biogas-solar-wind hybrid system for decentralized energy generation in India: a case study of Ringhim village, Sikkim

Dependence on fossil fuel has significantly resulted in global climate change and harms the ecosystem. The process of integration of electricity production with renewable energy sources can significantly improve the economics and energy balance, especially in rural areas. The optimization of decentralized energy generation in India is done by HOMER Pro software. It performs energy balance calculations and determines the least net present cost for each system configuration. In the present study, design of hybrid renewable energy system (HRES), i.e. solar PV, wind and biomass for a rural village in North Sikkim, has been done as a case study. The village is mainly dependent on agriculture and livestock economy. Daily load consumption by 160 houses in village calculated for two distinct seasons was 262.4 kWh with a peak energy demand of 63.45 kW. The optimized simulation results gave the best possible configuration combinations made up of 1.9 kW PV array, 20 kW biogas generator, 63 strings batteries, 1.96 kW inverter and a 2.3 kW rectifier. Results for the combination showed electricity generation was mainly from biogas generator which was cost-effective and sustainable alternative to grid extension. Moreover, the most economical HRES was strongly dependent on the available energy sources at the location. In addition to this, the system has internal rate of return of 7.42% and payback period of 4.53 years. The software helps in determining feasibility of the configuration and estimates the cost of installing and operating the system over the project lifetime. This techno-economic approach is viable and will meet the power demand of 160 households of the village and is therefore recommended for future electrification projects.