Daily meter (dm) 

A Daily Meter Supply Point that has a yearly consumption of more than 58,600,000kWh (2,000,000 therms per year), will have a mandatory data logger fitted to record, store and transmit daily readings and measurements. A daily meter is recorded every day.

Non-daily metered (ndm)

A Non-Daily Metered Supply Point has its consumption read on a monthly, quarterly or longer basis.

Distribution use of systems (duos)

A Distribution Use of System, or DUoS, charge is included in a business’ electricity invoice to cover the cost of supplying their electricity through their supplier’s regional network.

What a duos charge covers

DUoS charges cover the cost of receiving your electricity from the national transmission system and feeding it directly into your business through the regional distribution networks. It covers the costs of installing, operating and maintaining the regional distribution network, to ensure a safe and reliable electricity supply.

Duos availability charges (or kva or supply capacity)

This is the charge for the power capacity held available for a supply point, its charged in £/kVa/day whether you use it or not. If the capacity is breached and excess availability is used, this is chargeable as an excess availability capacity charge. It’s important that you set your kVA at the correct level, so you do not pay for capacity that you don’t need. You can contact your local DNO directly to discuss your kVA requirements.

Duos reactive charges

This is the measure of ‘non-working’ power. Some electrical equipment, typically motors and transformers, require reactive power to function effectively. Reactive power is chargeable if it exceeds limits set by the DNO. If your site has a poor power factor (ratio of active power to reactive power), it is possible to mitigate these costs by installing Power Factor Correction equipment.

What is a distribution network operator?

Your distribution network operator (DNO) is the company that owns and operates the power lines and infrastructure that connects homes and commercial properties in your area to the electricity transmission network. They can help you with queries such as moving your meter, connecting your property, or with a power cut.

Visit the Energy Networks Association website to find out who your network operator is. Find out more about your Network Operator’s standards here.

Domestic or non-domestic supply

A Supply Point with an AQ of 73,200 kWh (2500 th) or less, is deemed as a domestic site. It’s important to note that this does not necessarily mean a residential site. A supply point with an AQ of over 73,200 kWh is deemed as non-domestic.


Energy Intensive Industry (EII)

Visit our dedicated page, to find out more about Energy Intensive Industry (EII)

Electricity charges

Non-commodity electricity charges are added to an electricity invoice by the government and third parties such as distribution companies. There are a variety of non-commodity charges attached to electricity.