Who, What & Where

  • Rahimafrooz Renewable Energy
  • 80 kWp solar-powered hybrid mini-grid
  • Ghorjan Island, Bangladesh

The Company

Rahimafrooz Renewable Energy Limited (RREL) is a leading South Asia based solar home system (SHS) integrator and installer with over 600,000 customers based in Bangladesh and growing every month with the very first installation in 1989. It also develops mini-grids and manufactures solar PV modules and has unique storage technology for SHS. The company employs over 4,000 people with an extensive rural service and selling network for access to energy using on-line and smart phone-based systems.

The Challenge

Commercial use of renewable energy in a sustainable manner is still a great challenge for Bangladesh. Despite all the government’s policies, goals and progress, a significant population residing in the remote rural areas will be without electricity in distant future. The geographical diversity makes it difficult to provide grid electricity to the rural isolated villages. There are currently 1,034 villages where grid connectivity is not possible.

Renewable Solution

  • 80 kWp solar-powered hybrid mini-grid was installed to provide 230 V grid standard electricity for domestic, productive and commercial loads.
  • Crystalline solar PV diesel hybrid with AC-DC coupling for maximum system efficiency. The AC coupled side will directly supply loads during the day from solar PV modules through the on-grid inverter. Night-time loads will be served from the energy storage system (ESS) (538.56 kWh), where energy will be stored from DC coupled solar modules as well as excess energy from the AC coupled side.
  • Flooded lead-acid low maintenance Tubular Plate batteries have been considered for the ESS because of its excellent deep discharging capacity, economic viability for such applications, and the expected life under high and extreme temperatures.
  • A diesel-powered generator has been considered for peak shaving or energy deficit from Solar PV modules in bad weather.

Project Financing and Costs

The mini-grid is owned and operated by RREL. Energy is sold on a pre-payment basis and the revenue model is sales of electricity on with a differentiated day and night-time tariff averaging to ~USD 0.41/kWh. The project was completed in 12 months and the total capital cost (CAPEX) of the project was USD 551,250. The project IRR is 10.08% over 10 years. The initial infrastructure CAPEX is relatively high compared to this 80 kWp plant size. There are future plans to expand the capacity of the mini-grid and the Project IRR will increase accordingly. The project was financed through a mix of a grant, a loan and equity. The proportion of each is 40% grant, 40% loan, and 20% equity.

Project Outcome

This mini-grid has been operational since February 2018. A survey was conducted in August 2018 to assess the impact of the mini-grid on the people of Ghorjan Island. As a result of the project, socio-economic changes have taken place. For example, the number of people per household earning a living increased by 25%. Engagement in productive work has also increased by 33.33%, especially among women who are now engaged in weaving, sewing. The monthly average income per household has increased by 13.98% over a six-month interval. People are being attracted to small business from physical labour, farming, and fishing. Business activities at night have also increased.

Appliances usage for entertainment and commercial appliance usage has increased significantly; e.g. TV, computers, energy efficient refrigerators etc. Light and TV enables students to have more study hours and recreational facilities. The number of shops has increased in all three markets. Average daily sales have also increased from BDT 18,000 (~USD 212,98) to BDT 21,000 (~USD 248,48) (16.6%) over six months. Female participation in education centres has also increased. School operating hours increased from five to six hours, providing increased practising time for the students.

RREL reduces the demand for non-renewable energy through both replacing traditional sources of energy, such as grid electricity and diesel, while introducing renewable energy for new energy demand. This reduces carbon emissions from existing energy practices and prevents emissions arising from new sources.


Source: Private Sector Driven Business Models for Clean Energy Mini-Grids: Lessons learnt from South and South-East-Asia