To provide sustainable energy to countries' most rural areas, the company Alfen developed SOPRA. The Sustainable Off-grid Power Station for Rural Applications provides autonomous energy grids at locations where this was not previously feasible. The basic solution comprises a power conversion system, a battery pack and an advanced regulating system for the batteries, which is very mobile. The solution can therefore be used anywhere in the world. The system pays for itself within only a few years, as it replaces the expenditure on conventional energy sources such as oil and candles. Thanks to these savings in fuel costs, a SOPRA system is the ideal solution for even the poorest of countries.