Two-way electric power accounting NET METERING
NET METERING – is a two-way accounting system administered by an electricity grid operator designed for a household where the annual consumption of electrical energy is essentially the same as its annual electricity consumption. Benefits of the system can only be used by households that have installed a solar PV power plant producing electricity used in the household.
When a solar PV power plant does not produce enough electricity to meet the household needs (for example on a cloudy or winter day), additional electricity is imported from a grid operator. When a solar PV power plant generates more electricity than at the time the household consumes (for example on a sunny day), the excess electricity produced is exported to a grid operator‘s electricity network.
During the time of what is called electricity import or export, a meter installed by a grid operator “runs” in opposite direction, and at the end of the calendar year a balance of consumed and produced energy is reached, which means that at the end of the year the bill a household receives from a grid operator usually equals zero. Integration of a solar PV power plant into the NET-METERING system allows a household to ensure the price of electricity used in the household for 25 years - which is the lifetime of a solar PV power plant. An investment into a solar PV power plant today ensures the price of EUR 0.05-0.06 per kilowatt-hour for electricity used over the next 25 years. Consequently, a household that has installed a solar PV power plant can save up to 24.000 EUR on costs associated with electric power consumption over the next 25 years.