What is the difference between SMETS1 and SMETS2 smart meters?

SMETS1 meters are the first generation smart meters and may lose smart functionality when switching suppliers. SMETS2 meters are fully interoperable and retain smart features across all suppliers.

Can I switch energy suppliers with a SMETS1 meter?

Yes, but some SMETS1 meters may lose remote functionality after switching. SMETS2 meters remain fully functional after supplier changes.

Do SMETS2 meters support advanced features?

Yes, SMETS2 meters support features such as in-home displays, smart tariffs, and accurate remote readings without loss of functionality.

Are SMETS2 meters mandatory?

All new smart meter installations in the UK are SMETS2 compliant, ensuring full interoperability and long-term functionality.

Can I upgrade from SMETS1 to SMETS2?

Yes, you can request a SMETS2 upgrade from your energy supplier, often as part of routine smart meter replacement programs.

SMETS1 vs SMETS2 smart meters in the United Kingdom

Use this guide to understand the difference between first generation SMETS1 and second generation SMETS2 smart meters in Great Britain, how they affect switching suppliers, what the Data Communications Company DCC does, and whether you should upgrade.

The short answer: what is the difference between SMETS1 and SMETS2

Both SMETS1 and SMETS2 are government approved smart meter standards that automatically send readings and enable smart services. The biggest difference is interoperability when you change energy supplier.

SMETS1 meters are older. Early SMETS1 devices could lose smart features after a supplier switch. Many have since been enrolled into the national DCC network so they work smart again with most suppliers.
SMETS2 meters are newer. They are designed to work with the DCC from day one, so they stay smart when you switch suppliers and support enhanced security and functionality.

SMETS1 vs SMETS2 comparison

Feature	SMETS1	SMETS2
Rollout period	First generation, widely installed before 2018	Second generation, mandated for new installs from 2018
Interoperability when switching suppliers	May have gone non smart after switching in the past. Many are now DCC enrolled and retain smart functions	Designed to remain smart across supplier switches
Communications	Originally connected via supplier specific systems	Connects via the national DCC network from installation
Security and standards	Secure and compliant with first generation specs	Enhanced security and governance under current standards
Firmware and remote updates	Supported, varies by device and enrollment status	Supported as standard via DCC
Prepayment and smart services	Supported, features depend on device and supplier	Broader support for prepayment and smart tariffs
In Home Display compatibility	Works with compatible IHDs. Some older IHDs may need updates or replacement when switching	Designed for wide IHD compatibility across suppliers
Future proofing	Improved when enrolled into DCC	Built for ongoing interoperability and new services

How to tell if you have a SMETS1 or SMETS2 meter

Try these quick checks:

Installation date. If your smart meter was installed before 2018 it is likely SMETS1. Newer installs are usually SMETS2.
Meter paperwork and labels. The documentation from your installation or the sticker on the meter often states SMETS1 or SMETS2.
Ask your supplier. Give them your meter serial number and they can confirm the standard and whether your SMETS1 is DCC enrolled.
Switch test. If you have switched supplier recently and your meter still sends automatic readings and your IHD works, your meter is likely SMETS2 or a DCC enrolled SMETS1.

Switching suppliers with SMETS1 and SMETS2

With SMETS2, you should keep your smart services when you change supplier because SMETS2 devices use the DCC from day one. With SMETS1, early devices could temporarily lose smart services after a switch because they were connected to supplier specific systems. A national program has been enrolling SMETS1 meters into the DCC so that they work smart across suppliers. If your SMETS1 is not yet enrolled, your supplier can advise on the next steps or arrange an upgrade.

Either way, you can still switch energy supplier. Your new supplier will tell you what smart services will be available during and after your switch.

Should you upgrade from SMETS1 to SMETS2

You may not need to. Many SMETS1 meters are being remotely enrolled into the DCC and work well. Consider an upgrade if:

Your SMETS1 meter consistently loses smart functions, for example it stops sending automatic readings after supplier switches
You want access to newer smart services that your current device cannot support
Your supplier recommends a replacement to improve reliability

There is usually no upfront charge for a smart meter installation, as costs are recovered through energy bills across the market. Installations are carried out by qualified engineers under the Smart Metering Installation Code of Practice.

Ready to move to SMETS2 or check your eligibility

Contact your energy supplier to confirm your meter type and options. If an upgrade is available, they will arrange a convenient installation appointment.

Check eligibility and next steps

Benefits you get with a smart meter

Accurate bills with automatic readings so you avoid estimated charges
Near real time energy information on your In Home Display to help you manage usage
Access to smart time of use tariffs where available
Remote support and firmware updates for ongoing reliability and features
Prepayment top ups and balance checks without needing to visit a shop, where supported

Security and data privacy

Smart meters use robust encryption and are installed and operated under government approved standards. Your supplier can only access data needed to bill you and run your account. You can control optional data sharing preferences such as half hourly data for smart tariffs. SMETS2 meters are designed with enhanced security controls and governance via the DCC.

Frequently asked questions

What does SMETS stand for

SMETS means Smart Metering Equipment Technical Specifications. SMETS1 is the first generation standard and SMETS2 is the second generation standard used for newer devices.

Do I have to replace a working SMETS1 meter

Not necessarily. Many SMETS1 meters are being enrolled into the DCC so they work across suppliers. If your SMETS1 is reliable and provides the services you need, you may not need to replace it. Your supplier can advise.

Will my smart meter still work if I switch supplier

SMETS2 meters are designed to stay smart when you switch. Many SMETS1 meters now also stay smart after switching once they are enrolled into the DCC. Your new supplier will explain what to expect during your switch.

Can I use my existing In Home Display after switching

Often yes. SMETS2 IHDs are designed to work across suppliers. Some older IHDs linked to SMETS1 meters may need an update or replacement. Your supplier can advise and may provide a compatible IHD.

How long does a smart meter installation take

Typical appointments take around 2 hours for both gas and electricity. The engineer will test your supply, install the meter and In Home Display, and show you how to use it.

Is there a cost to get a smart meter

Suppliers usually install smart meters at no upfront charge to you. The cost of the rollout is recovered across energy bills in the market.

Get started

Want the benefits of a SMETS2 meter or need help confirming your current meter type

Check your latest bill or installation paperwork for your meter type
Contact your supplier to confirm whether your SMETS1 is DCC enrolled
Book an upgrade if recommended or if you want enhanced interoperability

Speak to an advisor