as of 8 february 2016, the rate is 4.39 pence per kwh of power generated for domestic systems of 4kwp (p means peak i.e. the maximum power that the system can produce) or less and where homes meet the minimum epc requirement of band d. the export tariff is 4.85 pence per kwh exported to the grid. the amount of electricity exported is not usually measured for domestic installations. it is calculated by assuming that 50% of the electricity produced is exported into the grid.