Annual Quotient (AQ) open/close

The estimated annual consumption of gas per site per year.

BACS open/close

Banking Automated Clearing System - an electronic system to make payments directly from one bank account to another.

Balancing Services Use of Systems (BSUoS) open/close

Balancing Services Use of Systems - A charge for keeping the network in balance. It is paid by the energy supplier to National Grid and passed on to the customer through their energy bill as a pass through charge.

Climate Change Levy (CCL) open/close

Climate Change Levy - a government-imposed tax to encourage reduction in emissions and greater business energy efficiency. CCL is chargeable only on units/kWh used and not on any other component of the bill, e.g. standing charge. The rate of CCL is now index-linked and therefore likely to increase on 1 April each year.

Under current legislation:

  • where VAT is charged at the standard rate, CCL (plus VAT on CCL) will usually be added to the bill
  • where VAT is charged at the reduced rate, the supply is automatically excluded from CCL
  • energy from renewable sources is automatically exempt from CCL

Customer Contact Team (CCT) open/close

npower's business customer service team who are your first point of contact with any queries.

Contracts For Difference (CFD) open/close

A charge paid to HM Revenue and Customs to fund a support scheme intended to provide long term price certainty and increase investment in low carbon generators.

Data Collector (DC) open/close

An organisation accredited by the Pool Accreditation Body to carry out data collection for half hourly (HH) metering systems. The DC is responsible for the retrieval and validation of metering data and forwarding it to the Data Aggregator. The DC may be appointed by the customer but must always be accredited and contracted to the customer’s supplier.

Department of Energy and Climate Change (DECC) open/close

DECC is a ministerial department, supported by 8 agencies and public bodies including OFGEM. The department works to make sure the UK has secure, clean, affordable energy supplies and promote international action to mitigate climate change. For further information visit:

Distribution Loss (DLOSS) open/close

For electricity only, a charge payable by the customer reflecting the proportion of electricity in excess of that consumed by the customer which needs to be purchased to take account of electrical losses in each Distribution Network calculated by reference to loss factors.

Distribution Network Operator (DNO) open/close

The DNO manages the installation and upkeep of the cabling within the local network, and the distribution of electricity to the grid supply point.

Distribution Use of Systems (DUoS) open/close

For electricity only, a fee payable by the customer to reflect the charges made by a distributor for the use of its distribution network to transport electricity. Also includes those made under a “Use of system Agreement” including meter equipment and operation services, data collection services, data aggregation services and settlement and registration services. Your DNO is permitted to vary their DUoS charges from year to year. This normally happens in April but may also occur in October. Indicative charges normally appear on the DNO websites approximately three months before they are due to take effect.

Estimated Annual Consumption (EAC) open/close

Forecast of consumption provided by your Data Collector based on historical reads.

Electricity Central Online Enquiry Service - (ECOES / XOSERVE) open/close

A national database for gas and electricity suppliers designed to help check they have correct information about customers prior to them transferring.

Energy Market Reform (EMR) open/close

EMR is made up of four elements

  1. Carbon Price Floor which sets a minimum price of carbon in the UK
  2. Emission Performance Standard which limits the annual carbon emissions new fossil fuel power stations are allowed to emit
  3. Contracts for Difference support scheme for low carbon generators which provides long term price certainty to increase investment while keeping energy prices affordable for consumers
  4. Capacity Market support scheme which provides regular payments to generators to secure the availability of capacity in advance so the energy system can meet demand from consumers.
    The cost of implementing EMR plus the cost of paying generators under the Contracts for Difference and Capacity Market schemes will be paid by energy users through their bills

Erroneous Transfer (ET) open/close

A process that is undertaken when a site is incorrectly registered to a new supplier. Agreement is obtained from the previous supplier to transfer the site back to them.

Feed In Tariff (FIT) open/close

A charge levied on suppliers to fund the Feed in Tariff scheme which incentivises new renewable generation. The charge is passed through to the customer.

Half Hourly Data (HHD) open/close

HHD is the product of the half-hour data meter. The data is usually made available to end users by way of a spreadsheet. A full years' half-hour data will be a spreadsheet with approximately 17,520 cells of data (one for every half hour of every day).

Independent Gas Transporter (IGT) open/close

An independent company which looks after a gas supply network that is not connected to the National Grid. Some suppliers charge an additional amount if your gas is supplied by an IGT rather than the mains gas network. If your MPRN number is 10 digits long and starts with a 74 or 75, you’re supplied by an IGT.

Capacity (kVa) open/close

The maximum electricity supply that has been agreed with the Distribution Network Operator (DNO). Also known as Total Power.

Kilowatt (kW) open/close

Unit of measurement for gas and electricity consumption. The number of kWh you have used within a given period will be shown on your bill, and you will be charged for each of these units. If you know the number of kWh you use annually, this is usually the most accurate way to get a quote before switching suppliers.

Kilo Watt Hour (kWh) open/close

Unit of energy equivalent to one kilowatt (1 kW) of power used for one hour. It is the unit of measurement most commonly seen on consumer energy bills and appliances. A 100 watt light bulb used for 10 hours will consume 1kWh. An appliance such as a kettle that uses 3 kilowatts of power would consume 1kWh in 20 minutes.

Line Loss Factor (LLF) open/close

Line Loss Factor codes are used to calculate the related DUoS charges for an MPAN. The figure gives the voltage scale of the MPAN and reflects both the amount of transmission infrastructure used to supply the meter point and the amount of energy lost through heat.

Meter Operator (MOP) open/close

Organisation appointed to maintain metering equipment. Half hourly meters are linked to a communication device that allows energy consumption data to be accessed remotely on a daily. This is then used for billing.

Meter Point Administration Number (MPAN) open/close

A 13 digit unique meter number. Your MPAN is the unique identifying number for the electricity supply at your property. Commonly referred to as a ‘Supply Number’ or ‘S’ number, and it can be found on your electricity bill.

Meter Point Reference Number (MPR) open/close

A gas unique meter number. If it begins with a 7 it is an IGT. Your MPR is the unique identifying number for the gas supply at your property. An MPR can be a ten digit number, commonly referred to as an ‘M’ number, and can be found on your gas bill.

Meter Serial No (MSN) open/close

Meter Serial Number. A number given to identify an actual meter.

Meter Time Switch (MTS) open/close

3 digit code that reflects the various registers a meter may have, whether it be a single rate, day night split, or even as Seasonal time of day.

Office of Gas & Electricity Markets (OFGEM) open/close

Regulator for gas & electricity businesses in Great Britain. For further information visit:

Renewable Obligation (RO) open/close

A government market mechanism to support renewable energy. It is an obligation on all electricity suppliers to provide a certain amount of their sales from accredited renewable sources.

Supply Start Date (SSD) open/close

The date the supplier is registered at the meter and begins supplying electricity or gas to the customer's premises.

Transmission Loss (TLOSS) open/close

Charge payable by the customer reflecting the proportion of electricity in excess of that consumed by the customer which needs to be purchased to take account of electrical losses in the transmission system.

Transmission Network Use of Systems (TNUoS) open/close

Charge for using and maintaining the transmission network. Charges are Lelevied to electricity suppliers by the UK’s electricity transmission network operators for the operationrunning, maintenance and development of the UK’s national transmission networks. Suppliers then pass this cost through to the customer.

For half hourly customers, TNUoS is billed using Triads (Triads are the three half hour periods during a year where the demand on the UK’s transmission network is at its highest). The charges are calculated on a £/kW basis in April every year, using your average maximum demand across the three Triad periods.