A power plant/unit is a facility that generates electric power. Several power units at one site comprise one power plant, whereby a power unit is characterized by the fact that it can operate independently of the other power units at the same site. Where several identical power units (i.e. with the same capacity, age and efficiency) are installed at one site, they may be considered as one single power unit.
Grid power plant/unit
Power plant/unit that supplies electricity to an electricity grid and, if applicable, to specific consumers.
Off-grid power plant/unit
Power plant/unit that supplies electricity to specific consumers through a dedicated distribution network which is not used by any other power plants. For a power plant to be categorized as off-grid, the following conditions need be fulfilled: (i) A grid (or grids) capable of supplying power to the specific consumer(s) to which the off-grid facility is connected must exist; (ii) The off-grid facility is not connected to the grid(s) and cannot supply power to the grid(s), but only to the consumer(s) to which it is connected; (iii) Under normal conditions, the consumer(s) are supplied their power requirements from the grid only, i.e. the off-grid plant(s) which are connected to the consumer(s) are standby on-site facility(ies) that are only used when power supply from the grid fails (or in many cases, when the quality of power supply to the end-user is below acceptable quality); (iv) To ensure a sound shift from the grid supply to the off-grid supply the consumer have in place a change-over-switch system (which may be manual or automatic).
Net electricity generation
refers to the difference between the total quantity of electricity generated by the power plant/unit and the auxiliary electricity consumption (also known as parasitic load) of the power plant/unit (e.g. for pumps, fans, controlling etc).
Grid/project electricity system
is defined by the spatial extent of the power plants that are physically connected through transmission and distribution lines to the project activity (e.g. the renewable power plant location or the consumers where electricity is being saved) and that can be dispatched without significant transmission constraints.
Connected electricity system
is an electricity system that is connected by transmission lines to the project electricity system. Power plants within the connected electricity system can be dispatched without significant transmission constraints but transmission to the project electricity system has significant transmission constraint.