The UK energy industry uses many technical terms and abbreviations.
Customers often hear these terms when speaking to energy suppliers, engineers, or when setting up solar panels and smart tariffs.
This guide explains some of the most common energy industry terms in simple language.
⸻
WAN – Wide Area Network
WAN stands for Wide Area Network.
In smart meter systems, the WAN is the connection between your smart meter and the national smart meter network.
This connection allows the meter to:
• send automatic readings
• receive commands from your energy supplier
• update tariffs remotely
If the WAN connection fails, your supplier may not be able to communicate with your meter.
⸻
HAN – Home Area Network
HAN stands for Home Area Network.
This is the local wireless network inside your home that connects smart meter devices together.
Devices connected through the HAN may include:
• electricity smart meter
• gas smart meter
• in-home display
• other smart energy devices
If the HAN connection fails, some devices may stop communicating.
⸻
MPAN – Meter Point Administration Number
MPAN stands for Meter Point Administration Number.
This is the unique reference number used to identify your electricity supply.
Every electricity connection in the UK has its own MPAN.
Energy suppliers use this number to manage your electricity account.
If you install solar panels and export electricity to the grid, you may also have an export MPAN.
⸻
MPRN – Meter Point Reference Number
MPRN stands for Meter Point Reference Number.
This is the unique number used to identify your gas supply.
Every gas supply point in the UK has its own MPRN.
Suppliers use this number to track your gas account.
⸻
IHD – In-Home Display
The In-Home Display is the small screen often supplied with smart meters.
It shows real-time information about your energy use, including:
• electricity usage
• gas usage
• estimated energy costs
The display connects to the smart meter using the Home Area Network.
⸻
Comms Hub – Communications Hub
The communications hub is the device attached to the electricity smart meter.
Its job is to connect the meter to the national smart meter network.
The hub sends readings from the meter to the supplier and receives commands from the supplier.
Without a working communications hub, the smart meter cannot function properly.
⸻
DCC – Data Communications Company
The Data Communications Company (DCC) manages the national smart meter communication network.
Energy suppliers use this system to send and receive information from smart meters across the country.
⸻
TOU – Time Of Use Tariff
TOU stands for Time Of Use.
These tariffs charge different prices depending on the time of day.
For example:
• electricity may be cheaper overnight
• prices may increase during peak evening hours
These tariffs are often used by homes with electric vehicles or battery systems.
⸻
SEG – Smart Export Guarantee
The Smart Export Guarantee (SEG) is a scheme that pays households for exporting electricity to the grid.
This usually applies to homes with:
• solar panels
• small wind turbines
• other renewable energy systems
Energy suppliers pay customers for excess electricity exported to the grid.
⸻
PPMID – Prepayment Meter Identifier
PPMID stands for Prepayment Meter Identifier.
This is the unique number used to identify a prepayment electricity meter in the smart meter system.
Energy suppliers use the PPMID to manage accounts where customers pay for energy in advance, rather than receiving a monthly bill.
It helps suppliers track:
• top-ups
• credit balances
• prepayment meter settings
⸻
SPAYG – Smart Pay As You Go
SPAYG stands for Smart Pay As You Go.
This is a modern version of traditional prepayment meters.
With SPAYG, customers can top up their meter using:
• mobile apps
• online accounts
• payment points in shops
Unlike older prepayment meters, smart pay-as-you-go meters can update balances remotely and provide more flexibility for customers.
⸻
UTRN – Unique Transaction Reference Number
UTRN stands for Unique Transaction Reference Number.
This number is used when a prepayment meter token is generated.
When a customer tops up a prepayment meter, the system creates a UTRN which represents the credit being added to the meter.
Each UTRN can only be used once and contains encrypted information about the payment.
This helps ensure that top-up transactions are secure.
Why Understanding Energy Terms Helps
Understanding these terms can make it much easier to deal with energy suppliers and understand how smart meters work.
Many smart meter issues are simply related to communication networks or system setup.
Knowing the meaning of these terms can help customers identify problems more quickly.