SMETS2 smart meters: what are they, what type do I have, what's good about them? DIY tutorial series

  • 14 September 2020
  • 2 replies
SMETS2 smart meters: what are they, what type do I have, what's good about them? DIY tutorial series
Userlevel 7

Updated on 14/09/20: if you have a SMETS1 Secure smart meter, see this guide. If your SMETS2 smart meter has an issue, diagnose it here. If your SMETS2 IHD has an issue, diagnose it here


Smart Metering Equipment Technical Specification (SMETS) 2 - your guide


Thanks to @Transparent for this image


What's good about S2 meters (why should you get one)? 

  • This new technology is supported by all SMETS2-ready suppliers and will allow you to switch without losing any services or requiring any equipment changes.
  • These new meters have highest standard of security for householder data, even better than S1 meters - (Encrypted data that can only be read by the receiving supplier developed by GCHQ). Strict new regulations and codes of practice, regulated by Ofgem, keep smart meter data private – and all your personal data is safeguarded by the Data Protection Act.
  • The meter will automatically submit your meter readings to us - this means bills will be accurate, rather than estimated
  • You’ll be able to see how much energy different appliances use, which could help you to cut down what you’re spending
  • Efficiency is the main reason why it is a government initiative to install them - their aim is to have at least 80% of households to have Smart meters by 2020.
  • Installation is free.

  SMETS 2 meter types 

(Please note that other suppliers may install other types of SMETS 2 meters.)


  Aclara (Elec) & Flonidan (Gas) Elster / Honeywell (Elec & Gas)
Installs Installed on all jobs Not currently installed. Installed on some jobs in 2019.
How to identify MSN begins:
  • Elec: 18M/19M/20M
  • Gas: G4F
MSN begins:
  • Elec: 188K/19K
  • Gas: G4K
  • Elec has blue A button & orange B button
  • Gas has 3 red buttons (A, B & C)
  • Elec has 2 vertical grey buttons (buttons are not labelled)
  • Gas has 3 round buttons: left arrow, circle and right arrow
  • Elec: 160mm H x 127 mm W x 65 mm D
  • Gas: 262mm H x 235mm W x 167mm D
Nearly identical size as Aclara & Flonidan.
Reading the meter
  • Elec: Press A three times until TOU Rate 1 appears.
  • Gas: Press C to wake up, then C to access the menu. Use B to scroll and C to select the reading option.
  • Elec: Press the top button once or twice
  • Gas: Press the circle button once or twice


 Dimensions of our SMETS2 meters: 

Aclara V2.5 Electricity Meter:


160mm H x 127 mm W x 65 mm D
Flonidan Gas Meter:


Elster Honeywell Electricity meters are nearly identical size as Aclara.


What do the buttons do / what actions can you do? 

Honeywell meters (Elec MSN has a 'K')

Electricity - Press the top button once or twice to access the reading

Gas - Press the middle button once or twice to access the reading. 

Aclara meters (Elec MSN has an 'M')

Electricity - There’s 2 buttons on an electricity meter. Pressing B will cycle through all the menus on the meter screen and pressing A will cycle through all the sub menus. To take an electricity reading, the customer will need to press A three times - TOU rate 1 will be the electricity reading. For economy 7 customers, TOU rate 2 will show the rate 2 reading.

Gas - Gas meters have A, B and C. Pressing C will give you the menu and A & B will allow you to scroll through the options. Balance is to check reading (when you wake up the meter is should automatically default to the reading screen).

Screen 1 - readings, active tariff price, standing charge, export reads, meter mode
Screen 2 - date, time, MPAN, 
Screen 6 - Meter Signal strength 
(The rest aren't very customer friendly, just being honest!)
If the meter is connected to the comms hub, it will have the word 'HAN' on it and signal bar to show what the HAN signal strength is.

If there’s WAN and HAN coverage the WAN & HAN lights on top will flash every 5 seconds. If they are searching for signal then they will flash every 3 seconds and if there is a connectivity issue then they will flash every 1 second or not flash at all.


 How does a SMETS2 meter communicate? 

Unlike S1, S2 electricity meters have a communications (comms) hub attached to them. The electricity meter, gas meter and IHD all communicate with the comms hub via HAN. Only the comms hub uses WAN and it communicates with the DCC (Data Communications Company).  The DCC then communicates with our billing platform.

Third parties and systems that use the SMETS2 network. Gentrack, Salesforce, ABE, MIS etc are all internal systems OVO uses. 


This is all we have for our SMETS2 DIY tutorial series guide - if we’ve missed anything off, let us know via a comment! 

2 replies

Userlevel 7
Badge +2

Erm, @Tim_OVO - You’ve pasted in that last section without removing the internal reference to Orion.

And are you going tell us what Gentrack is?

Userlevel 7

A lot of the information above is very technical, which we wouldn’t expect our customers to have to know, or be interested in knowing. However, I know of some (one of them above 😉 who value getting access to this information, so we wanted to post it here for your viewing pleasure. I don’t think you’ll find any online OVO content as detailed and technical as this: hope you find it useful! 


And are you going tell us what Gentrack is?


I’ve updated this now to outline these are internal system names. Thanks for spotting! :spy:


Gentrack (for those that are interested) is the name of our old billing platform, used by members who are on the old My OVO online portal. We’ve built our own billing platform over these last few years. Quiet an impressive feat, which we hope other suppliers worldwide may want to purchase and use.