Why Agile needs a smart meter: half-hourly billing explained
Octopus Agile does not charge a flat rate per unit. It charges a different price for every single 30-minute period of the day, based on what electricity actually cost on the wholesale market during that window. Overnight at 2am, you might pay 3p per kWh. At 6pm on a cold Tuesday, that same kWh might cost 40p.
To charge you accurately for this, Octopus needs to know precisely how much electricity you used in each 30-minute slot. A traditional analogue meter cannot provide this. It measures only a running total, read every few months by an engineer or submitted manually. That monthly total is completely useless for half-hourly billing.
A smart meter solves this completely. It records your consumption in 30-minute intervals and transmits that data automatically to Octopus over the wireless DCC network. Every day, Octopus receives 48 separate consumption readings from your meter. They multiply each one by the Agile price for that slot and add it up. That is your bill.
Without a smart meter, Agile billing is physically impossible. With one, it is automatic, accurate, and completely transparent. You can see every 30-minute usage period in the Octopus app, matched against the price you paid for it.
SMETS1 vs SMETS2: which you need and why
Not all smart meters are the same. The UK rollout happened in two generations, and understanding the difference matters when you are planning your Agile switch.
SMETS2 meters are the current standard. They communicate directly with the national DCC network using a built-in cellular radio module. When you switch suppliers, a SMETS2 meter re-registers automatically on the DCC network and continues sending half-hourly data to your new supplier without any interruption. For Agile, SMETS2 is the ideal choice. If you do not yet have a smart meter, request a SMETS2 installation. If you already have a SMETS2, you are ready to switch.
SMETS1 meters are the older generation, installed predominantly between 2012 and 2018. They used supplier-specific communication protocols rather than the DCC network, which meant they often went "dumb" when you switched suppliers, losing their smart functionality and reverting to basic meter mode. This was the most-complained-about problem in the first wave of smart meter installations.
Since 2019, SMETS1 meters have been progressively enrolled onto the DCC network through a process called DCC enrolment or migration. Most SMETS1 meters installed after around 2014 have now been enrolled and work correctly across all suppliers. However, compatibility with Agile's half-hourly billing is not guaranteed for every SMETS1 device. Contact Octopus directly, give them your meter serial number, and they can confirm whether your specific meter will work before you start your switch.
If there is any doubt, request a free SMETS2 upgrade. It adds a few weeks to your timeline but eliminates all compatibility risk.
How to check if your current meter is compatible
There are three reliable ways to confirm your meter type before starting a switch.
Check the meter itself. Look at the physical meter in your home. A smart meter will have a digital display showing real-time consumption data, and a small communication module (often with a round antenna or light indicator). An analogue meter has a rotating disc and a mechanical counter. SMETS2 meters are typically more modern-looking, with a gloss black or grey fascia and a brand name such as Flonidan, Landis+Gyr, or Honeywell. The model number is usually printed on a label on the front.
Check the Octopus app or account. If you are already an Octopus customer on a different tariff, open the app and navigate to "My Meter" or "Account Settings." Octopus records your meter type in their systems and will display it here. If you have never been an Octopus customer, this option is not available yet.
Call your current supplier or Octopus directly. Give them your MPAN number (the 13-digit number on your electricity bill, in the box labelled "S"). Either your current supplier or Octopus can look up your meter type instantly using this reference. Octopus's live chat is typically the fastest route to a clear answer.
How to get a smart meter installed for free
Smart meter installation is free for all UK households. This is a legal requirement under the government's smart meter rollout programme. No supplier can charge you for the installation, the equipment, or the engineer's time.
The simplest route is to switch to Octopus Energy first and request a smart meter installation as part of the onboarding process. Octopus offers smart meter installation to new customers, and their installation teams are typically faster than legacy suppliers because they prioritise smart meter rollout for Agile and other time-of-use tariffs.
Alternatively, request an installation from your current supplier before switching. Log into your supplier's account portal and look for a "Request a smart meter" or "Book an installation" option. Most major suppliers now offer online booking. British Gas, EDF, E.ON, and Scottish Power all offer free installations. Waiting times vary from 2-6 weeks depending on the supplier and your location.
If your current supplier has a long waiting list, switching to Octopus and requesting installation through them is often the faster path. Octopus typically books within 2-3 weeks for customers in most regions.
How long does smart meter installation take?
The booking waiting period varies. With Octopus, expect 2-3 weeks in most areas. With legacy suppliers, allow 4-6 weeks, though some areas wait longer during high-demand periods. Rural properties occasionally face longer waits due to travel scheduling for installation engineers.
The installation itself takes 1-3 hours, including testing. Engineers usually book a 2-4 hour appointment window to account for travel and any minor complications. Most installations complete within 90 minutes.
Once you have a SMETS2 meter installed, you can initiate your Agile switch immediately. The meter will register on the DCC network, and Octopus will begin receiving your half-hourly data from your switch date. By the time your 17-day switching period completes, everything will be ready.
What installation day looks like
The installation process is considerably less disruptive than most people expect. Here is a realistic account of what happens.
The engineer arrives and introduces themselves. They assess your existing meter, which is usually located in a cupboard, hallway, or external box depending on your property type. They briefly explain what they are going to do and confirm it is safe to proceed.
There is a short power outage while the old meter is removed and the new one connected. This typically lasts 3-10 minutes. Modern smart meters are designed for quick installation and the engineer will warn you before cutting power.
The engineer connects the in-home display (IHD), the small screen that shows your real-time energy consumption and cost. They configure it, test the connection to the meter, and confirm the data is transmitting correctly. Most IHDs start showing live data within minutes.
The engineer then verifies that the meter is communicating with the DCC network. If the signal is clear, enrolment completes during the visit. In some properties, particularly those with thick walls or in rural areas, DCC enrolment may take a few hours or up to 24 hours to finalise. This is normal and does not affect your supply.
Before leaving, the engineer walks you through reading the new meter, explains what the IHD shows, and confirms the installation is complete. You sign off on the work. The whole process from start to finish is, for most households, the easiest home infrastructure job imaginable.
Once your smart meter is installed and communicating, you are ready to switch to Agile and start using the AgileAlert live dashboard to plan your cheapest times to run appliances.