Solar power plant is based on the conversion of sunlight into electricity, either directly using PhotoVoltaic(PV) and tracking systems to focus a large area of sunlight into a small beam. PhotoVoltaic converts light into electric current using the photoelectric effect.
The term off-grid refers to not being connected to a grid, mainly used in terms of not being connected to the main or national electrical grid. In electricity, off-grid can be stand-alone systems (SHS) or mini-grids typically to provide a smaller community with electricity. Off-grid electrification is an approach to access electricity used in countries and areas with little access to electricity, due to scattered or distant population.