Half-Hourly Electricity Usage - Data Download

What is half-hourly data?

If you have a smart meter, this will be recording your electricity consumption in Half-hourly (HH) blocks. This information is how your energy supplier generates your bills, and the data can be downloaded from certain energy suppliers.

What does half-hourly data look like?

Half-hourly data is often provided as a data file (.CSV) compatible with Microsoft Excel and contains 17,520 data points when covering a complete 12-month period.

Why do we need a full 12 months’ worth of data?

If your energy supplier offers the facility to download this data, we would ideally need data covering a 12-month period. This data is the most effective way of us assessing when a property uses power. By matching a property's specific power usage over varying times and seasons, we are then able to optimise your system design and sizing, to ensure the highest possible financial return on your investment.

What If I can’t get this data?

If you can’t obtain this data from your energy supplier, we can use your annual usage figure, or an estimated annual usage figure. These are obtainable form almost all energy suppliers. Your proposal won’t be as in depth as when using HH data, but will still give us a valuable information to work with.

How do I get the half-hourly data?

If your supplier has an online portal, you may be able to download the data yourself. Your electricity supplier may also be able to provide this data for you if you contact them directly. At the time of publishing (July 2026), the details below show information around some popular electricity suppliers, and how you can obtain half-hourly data:-

Octopus Energy - You’ll need to log into your Octopus account via their Desktop Site, not their app. Once logged in, you can select the “My Energy” tab on the left side of the page, and then scroll down to the “Get your energy geek on” section. You can then choose the date range that covers the last 12 months, and the site will generate the required data. This may take a little while, but once it’s completed, the option to download the file will then appear next to the date range. You can select this to download the file.

OVO - You can log into the OVO app and select ‘Usage’, you can then select ‘View as table’ beneath the usage graph, and then select ‘Download data’. You may need to download a file for each month over the last year.

British Gas - Do not support HH data download via an online portal or app. In this instance you can provide an annual usage figure which you can obtain by accessing their app.

E.on - Do not support HH data via an online portal or app. In this instance you can provide an annual usage figure which you can obtain by accessing the E.on app, and tapping the “Usage” tab at the bottom of the page. You can then select the “Year” option, and select the last available full year.

EDF - Log in to your EDF MyAccount online or open the EDF app. Select your “Energy Hub” dashboard. you may need to check your Smart Data Preference settings to show that your frequency is set to Half-Hourly. Available information suggests that data can take up to 24 hours to appear after updating this setting. Navigate to your usage history and look for the Download or Export option and download a .csv file.

Are there any alternatives?

There are third party services available such as Bright, Loop Energy, Ivie, or Hugo. These services often offer an app and a desktop portal, that allow you to monitor your energy consumption if you have a SMETS2 (or E&A SMETS 1) smart meter. We’re aware that the “Bright” service allows you to access and download your half hourly data for free via their web portal.

Please note that we are not affiliated to any of these third party services in any way, and other similar providers may be available.

You will typically need to grant these services permission to access your smart meter data. Once authorised, it usually takes a few days for the apps to sync and display your historic and ongoing usage.