Daily Contract Quantity (DCQ)

The contracted amount of gas supplied daily to a site or to a terminal.

Daily Meter (DM)

Businesses whose annual quantity (consumption) is greater than 58,600,000 kWh (or 2 million therms per annum) must be daily metered. This is a mandatory requirement.

Data Collector (DC)

An accredited organisation appointed by an energy supplier to carry out data collection for half-hourly AMR metering systems. It’s the DC’s responsibility to retrieve and validate meter reading consumption data, before passing this on to the supplier.

Data Logger 

A data logger is a device used to record gas consumption and to transmit meter readings remotely — for more accurate gas billing.

Deemed Contract

A contract which applies to a business energy customer at a premises without a signed and written contract for its supply. Deemed contracts will have a default rate for supply.

Department of Energy and Climate Change (DECC)

The Department of Energy and Climate Change (DECC) was created in October 2008, bringing together energy policy previously with BERR and Defra.

Distribution Network (DN)

(Gas);The operator responsible for the operation and maintenance of the local transmission system. There are currently eight DNs in the UK.

Distribution Network Operator (DNO)

(Power);The operator of one of the 14 regional distributors responsible for maintaining the electrical network in the UK. All DNO charges are regulated by Ofgem.

Distribution Use of System (DuoS) Charges

These are the costs associated with the Distribution Network which are levied by the regional Distribution Network Operators.