What is self-consumption?

Self-consumption is the proportion of electricity generated that is then consumed within the property. This could be directly or via a battery:

Self consumption =  Solar PV electricity consumed within property (kWh) / Solar PV electricity generated (kWh)

Energy that is not self-consumed is then exported to the grid. A higher self-consumption typically means a faster payback period since the amount spent on energy bills. Read here for guidance on how to reduce your payback period.