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Welcome to our glossary section. There’s plenty of acronyms in the energy industry. Here we make it simple with the key definitions you’ll need.


AMR | Automatic Meter Reading

AMR refers to a collection of energy devices that can be used to remotely store and collect energy readings.

COP2 | Code of Practice 2 meter

Code of practice 2 meters are for High Voltage (HV) sites using between 10MW and 100MW, where the circuit capacity does not go over 100MVA. Two meters are installed for greater accuracy and resilience.

COP 3 | Code of Practice 3 meter

Code of practice 3 meters are for Low Voltage (LV) or High Voltage (HV) supplies which use between 100kW to 1 MW. They need a main and a check meter to be installed which both record consumption. The main meter is used for settlement and billing.

COP 5 | Code of Practice 5 meter

Code of practice 5 meters are for Low Voltage (LV) supplies which use between 100kW to 1 MW. They only need a single meter to be installed.

CT Ratio | Current Transformer Ratio

A CT or Current Transformer is a piece of equipment which clips or wraps around your electricity supply cable and sends the reading of your current consumption to the meter.

This means the meter is not directly wired into the electrical circuit.

Most HH meters will be CT meters whilst NHH meters are mainly Whole Current.

The CT ratio refers to the level of current going through the supply cable to the level of current going from the CT to the meter. So a 100A supply cable with a 5A CT gives a CT ratio of 20:1.


DA | Data Aggregator

This is the agent responsible for reviewing the accuracy of your electricity data, generating estimates based on previous usage and then submitting them to your supplier for settlement. In most cases your DC and DA would be the same company as the tasks go hand in hand.

DC | Data Collector

This is the appointed agent responsible for collecting your electricity consumption data in line with industry regulations and requirements. You can choose your preferred DC otherwise the supplier will appoint their own agent.

DR | Data Retriever

This is typically a second person collecting your energy data but is not responsible for submission to your supplier or any kind of validation and is not required by law.

HH | Half Hourly

HH is the frequency in which energy data is recorded and stored, sometimes called 30 minute interval data, meaning there’s 48 HH values in 24 hours.

NHH | Non-Half Hourly data

NHH is the frequency in which energy data is recorded and stored. If your supply is NHH then the data will typically be collected once a day in line with Elexon’s Balancing & Settlement Code. Profile classes will be applied to configure the consumption pattern.

MHHS | Market Wide Half Hourly Settlement

This the directive which states that all NHH Non-Half Hourly meters must be upgraded to Half Hourly to enable more accurate data collection and settlement across the UK electricity network. This will support an improved way to measure supply and demand in a changing network where renewable generation plays an increasingly vital role and help with the UK’s transition to Net Zero. Elexon manage the programme, a huge industry change which will affect many organisations as they move into HH data and settlement.

MOP | Meter Operator

A HH MOP is the appointed organisation responsible for the design, installation and maintenance of your electricity meter, ensuring it is operational and recording energy correctly. It is an OFGEM regulation to have a MOP for all HH supplies. MOPs are appointed to manage a meter by the SUpplier, they cannot act without a supplier’s MOP appointment. Customers can choose their own MOP otherwise a supplier will appoint their preferred MOP.

MPAN | Meter Point Administration Number

This is the unique 13-digit identifier given to each electricity supply point.


Ofgem Is the governing body for the UK’s energy industry and performs the role of independent regulator, responsible for maintaining standards across domestic and commercial markets.

PC | Profile Class

This is first two digits listed in the top line of your MPAN. These relate to the measure of expected consumption and your load profile. They typically range from 00 – 08 with the highest number referring to the lowest banding of expected consumption.

KVA | Kilo-Volt Ampere

KVA stands for Kilo-Volt Ampere and shows how much electrical power can be fed into your meter point, in other words, your supply capacity.

1 KVA equals 1,000 Watts (or 1 kW).


Data Logger

A device used to measure energy consumption that requires connection to the main meter. They can be integrated into the meter itself, or a separate device which connects to the meter’s pulsed output.

Correction Factor

Correction Factors correct for the differences in gas pressure from the distribution point to your meter.

We ask for customers to provide them at the start of any Gas logger or MAM project so we can apply them automatically to your data in Stark ID, so you get greater accuracy.

CRN | Confirmation Reference Number

This is a unique number which links to a specific MPRN. Each MPRN has its own CRN. Together the MPRN & CRN unlock Xoserve, so we can collate all necessary information at the start of a MAM project. Without the CRN we cannot access the confirmation and rely on the supplier to provide it instead. provided by the gas supplier.

CV | Calorific Values

Calorific Values are provided by National Grid and they correct for the quality of the gas you use.

We automatically apply these to your data in Stark ID.

Isolation Barrier Relay

Where you have a corrector in place an isolation barrier relay must be installed before any data loggers can be connected. The device provides a safety barrier between the electrical corrector device and the gas meter.

MAP | Meter Assest Provider

This is the appointed agent who will finance the gas meter.

MAM | Meter Asset Manager

This is the appointed organisation responsible for the design, installation and maintenance of your gas meter and ensuring that it is functioning and recording correctly. Depending on the Nexus Class the MAM is operating under, will determine whether you get daily data or not. You can choose your own MAM otherwise your supplier will use their preferred agent.

MPRN | Meter Point Reference Number

An MPRN is the unique identifier given to each gas supply point.

Pulse splitter

A pulse splitter is a device which allows a meter to be connected to more than one data logger.

Rotary gas meter

If you have a rotary gas meter, we’ll need to survey it and provide a DFA before any gas meter exchange can take place. This is an industry requirement and can result in a new meter set up and design being created, improving the layout and space of the meter set up.

Spare pulsed output

Meters with no integrated data logger will have a connector, or output, for external devices like data loggers to be attached. The output will give the external device access to the pulses the meter is counting consumption in, hence it being a pulsed output. Once connected the data logger will be able to count the pulses the meter is creating.

When something is already connected to the meter, a third party logger for example, then you can tell us there’s no spare pulsed output available. This is fine, we’ll follow the meter owner’s instructions on installing a pulse splitter.


Xoserve are a private company responsible for the operation of gas shippers, suppliers and transporters. Their online platform also enables Gas MAMs, such as Stark Connect, to access meter technical details and supply details to help with meter adoption and installation projects. Both the MPRN and CRN need to be provided to access the information.



This is a unit you’ll see in our Stark Zero and Stark ID platforms.

It’s metric, and converts other GHGs to their equivalent CO2 amount, all depending on their Global Warming Potential (GWP).

Direct Greenhouse Gas Emissions

Release of GHGs from within areas you control.

ESOS | Energy Savings Opportunity Scheme

This is a mandatory energy reduction scheme and applies to a specific set of businesses that meet the criteria. Those businesses must review and be able to demonstrate what accounts for at least 90% of their energy consumption, submit their findings and then an assessor will make recommendations on where energy reductions can be made to reduce waste.

Energy Savings Opportunity Scheme (ESOS) – GOV.UK (

GHG | Greenhouse Gas

These are gases produced either naturally or as a result of human activity whose radiation impacts our atmosphere. Most common are carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), hydrofluorocarbons (HFCs), nitrogen trifluoride (NF3), perfluorocarbons (PFCs), and sulphur hexafluoride (SF6). Emissions from these gases are reported as carbon dioxide equivalents (CO2e).

Emissions can be Direct or Indirect.

GWP | Global Warming Potential

Carbon dioxide has the GWP of 1, and all other gases are compared to that. IPCC monitors and provides the equivalents for each GHG. You can see the latest results here:

Global Warming Potentials (IPCC Fourth Assessment Report) | UNFCCC

SECR | Streamlined Energy and Carbon Reporting

This is a mandatory reporting requirement for large businesses to assess and review their energy consumption, efficiencies and carbon output.

Environmental reporting guidelines: including Streamlined Energy and Carbon Reporting requirements – GOV.UK (

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