The electricity bills include the following costs: sales costs, costs incurred to purchase energy and for the dispatching service, which ensures a balance between electricity supply and demand at all times, costs to cover the service for transporting electricity on the national transmission and local distribution grids through to the meter (transport, distribution and metering costs and system charges), and taxes; In January resolution 582/2015/R/eel, a programmatic framework to implement the reform of network tariffs and tariff components to cover general system charges for residential customers.