What is DUoS?
DUoS is the cost of maintaining the regional networks that transport electricity from the local sub-station to the end customer. This infrastructure is owned and operated by the DNO (Distribution Network Operator) in your area. DuoS costs are charged to generators and suppliers, and then recovered from electricity users.
How is DUoS calculated?
Each DNO publishes a forecast of charges in its region and suppliers use this as a basis for DUoS calculations.
DUoS charges include the following four components:
This charge relates to the amount of electricity consumed, which will vary according to the time of day. For half-hourly (HH) meters, the volume used during each half hour is multiplied by the rate charged at that time. These rates will also differ by DNO.
This is a fixed daily charge set by the DNO, and is established according to the amount of electricity that is made available by the distributor to meet the customer’s maximum demand at any one time, (measured in kVA). This charge allows the distribution company to reserve that capacity on the local electricity network. If the maximum capacity is exceeded, excess capacity charges will apply.
This a fixed cost charged by the DNO per meter type, for use of the network. A rate is published by the DNO for each meter type.
Reactive power is recorded by the meter and is charged at a pence/kVArh rate. It is the difference between the electricity supplied and the amount of that electricity that is converted into useful power. If a site has high reactive power, a large quantity of power is being wasted. This means that the DNO must direct more current into the site to provide the required output electricity. This places additional strain on the network and ultimately results in additional cost.
How is DUoS reconciled?
Applicable to customers with pass through DUoS charges as part of their contract.
Where DUoS is charged on a ‘pass through’ basis, it is regularly reconciled to adjust any difference between forecast and final cost. Reconciliations are on a per meter basis.
For more information on DUoS visit http://www.energynetworks.org/electricity/regulation/distribution-charging/distribution-charges-overview.html or speak to your Account Manager.