Once your solar power system is installed you will require a new meter. If you have an older style accumulation meter (with spinning disk) this will need to be replaced with an interval meter or smart meter. This is because an accumulation meter does not record the electricity you export to the grid or the electricity you import from the grid. An interval meter or a smart meter provides half hourly readings of the electricity you consume and the surplus electricity you generate. The new meters are provided by your electricity distribution provider at an additional cost.