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

by Craig Watson 27 March 2026
With consumer spending declining and OFGEM raising their price cap, you would be forgiven for seeing February as a month where negative news was at the forefront, but in the energy markets, this was not the case.
by Craig Watson 27 March 2026
In a year that began with falling energy prices, there were recurring catalysts that led to prices climbing steadily higher. Geopolitical uncertainty and the perennial threat of escalating conflicts meant fear would maintain a constant presence in the wholesale markets. We will look back at the key energy stories from 2024, and how the energy markets are likely to shape up in 2025. Quarter 1  The year began with cautious optimism as the UK’s gas reserve levels were healthy and prices for the Summer’24 season were in freefall. In February, prices pulled back to their lowest levels since 2021, and for the first time in a while, we identified that there was greater potential for upside risk than for further downward price movement: “ there now (exists) an asymmetrical element of risk should the market encounter a supply-side problem of significance. ” During February we had advised customers on flexible contracts that this was an ideal time for making purchases. March would see prices begin to ascend again as international conflict would create problems with LNG imports, and we would highlight the geopolitical risks as an area for concern moving forwards: “ fears remain and there are potential negative catalysts that could lead to prices rising further, with the main factors to watch out for being based on geopolitical unrest. “ For a business that purchases their energy in advance, this quarter was the optimal time for purchasing during 2024. In February, electricity prices for Winter’25 were down to 7.75p/Kwh, and as low as 6.05p/Kwh for Summer’25. Winter’25 ended the year with prices above 11.1p/Kwh, with Summer’25 prices exceeding 9p/Kwh. For a company that uses 500,000Kwh of electricity per month, the difference between buying at the February low point compared to today’s prices would represent a yearly saving of over £200,000.
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