Final answer:
The process through which excess energy is sent back into the grid is known as net metering. It is mostly used when a house or business generates its own electricity through renewable energy sources. They are billed only for their 'net' energy use.
Step-by-step explanation:
When surplus energy is fed back into the power grid by an energy producer, this is referred to as net metering. It's a billing arrangement commonly used when a house, business, or other site generates its own electricity through renewable means, such as solar panels or wind turbines. The 'net', in net metering, refers to what's left after subtracting the energy used from the energy produced. If more energy is produced than used, the excess is sent back into the grid. When the energy producer needs more electrical power than it can generate, it takes from the grid. With net metering, they are only billed for their 'net' energy use.
Learn more about Net Metering