3 December 2025

Understanding Your Energy Bill: Use of System Charges

What are the use of system charges?


On your electricity bill, you may notice three "Use of System" charges listed among the various fees and costs. These are:


In this article we will explain what they are and why they are charged.


DUOS

Distribution use of system charges are applied by the local distribution company for using their network to transport electricity from the national grid to the user.


They can include a DUOS standing charge which covers the cost of maintaining and operating the local distribution network. This is a fixed charge and is based on the size of the connection to the network.


There are also DUOS unit charges relating to the amount of electricity consumed. These unit charges can come in red, amber, and green depending on the time of day and reflect the demand on the local area network. During times of high demand the charge will be classed as red, which is the highest of the 3 unit costs. During times of low demand the charge will be green, the lowest of the 3 unit charges. Amber charges fall in between red and green, being applied to periods of medium demand. 


The amounts charged for these can vary depending on the type of meter, distance from the connection point, and the available supply capacity. On average, red charges are 50 times more than amber charges, and 450 times more than green charges.

These charges are designed to encourage users to consume less electricity during peak hours and encourage use during times when there is less demand on the grid.


Can DUOS charges be reduced?


One way to reduce costs is to monitor when energy is being used and – where possible – try to conduct energy-intensive activities outside of peak demand hours. By understanding when you normally use the most electricity you can begin to assess which activities can take place during hours when the demand across the grid is less intense. 


For those with half-hourly meters, this can be possible if you have an energy monitoring service -- such as the one included with our bill validation portal. Clearly seeing how much you consume at different times of the day, and different days of the week, can offer valuable insight into your consumption patterns. 

TUOS

Transmission Use of System charges are applied by the National Grid for the use of their high-voltage electricity transmission network which transports electricity from power stations to the local distribution networks. 


These charges cover the cost of maintaining and operating the high-voltage electricity transmission network and are calculated based on the amount of electricity consumed. 


They are charged at a fixed rate per kWh.


BSUOS

The Balancing Services Use of System (BSUoS) charge covers the costs incurred by the National Grid for balancing electricity supply and demand in real-time. The BSUoS charge reflects the cost of maintaining the stability and security of the electricity system and is calculated based on a consumer's share of total electricity.


The charge can vary widely based on levels of renewable energy generation, changes in demand, and unexpected events that affect the grid's stability.

If you would like to know more about any of the charges on your bill or receive advice on how to get the best deal when renewing your contract then please don't hesitate to contact our team at admin@seemoreenergy.co.uk

2 November 2026
By Adam Novakovic Energy Markets Consultant Energy costs remain one of the largest overheads for British charities and housing providers. Following the government’s legislation introducing a temporary zero rate of VAT on qualifying domestic and non-business electricity supplies in Britain, many organisations have a major opportunity to cut their energy costs. If your charity or housing association is still paying the standard 20% business VAT rate on electricity bills, you could be missing out on an immediate zero-rating as well as substantial retrospective refunds. The VAT Rate Change Standard commercial energy comes with a 20% VAT rate, with organisations that use less than 1,000KWh/month paying a reduced rate of 5%. Under revised VAT rules, supplies that meet the qualifying 5% threshold are now cut to 0% VAT across England, Scotland, and Wales. These changes are for electricity only – gas retains the 5% VAT rate – and should be automatically applied by suppliers. However, this is only the case for accounts where the correct VAT rate is already applied to the account. In order for this to happen, a VAT declaration certificate needs to be sent to the supplier.
2 November 2026
October Review By Adam Novakovic Energy Markets Consultant  October was a month that saw far more tricks than treats in relation to energy prices. While there were times when the hope of falling prices seemed as though it was on the verge of becoming reality, those hopes never materialised and prices continued to ascend.