Meters and readings
How to see and download your smart meter data
Where to find your half-hourly smart meter data from Octopus: in the app, through the free API, and with this site’s private usage tools.
Edited by Rob Gibbs. Published: . Guidance reviewed: .
Short answer
If your smart meter sends half-hourly readings, you can see them in the Octopus app and account. You can also download them through Octopus’s free API, using the API key, MPAN and meter serial number shown on the developer page of your online account. This site’s usage tools use the same API and run in your browser.
In the app
The Octopus app shows usage by day, week and month, and for most smart meters, half hour by half hour. It is the quickest way to see when you use the most.
Through the API
To get the raw data, open the developer page in your Octopus online account. It shows the three things you need:
- Your API key. Treat it like a password.
- Your MPAN, the 13-digit electricity supply number.
- Your meter serial number.
Using the data
With half-hourly data you can price your real usage on any tariff, check a bill, or spot missing readings. This site’s private tools do all three without your data leaving your browser.
Questions people ask
Is the Octopus API free?
Yes. Customers can use their own API key to read their consumption and published prices.
Why are some half hours missing?
The meter may not have sent them. Check the data gaps tool and report long gaps to Octopus.
Tariffs in this guide
Related guides
- SMETS1 vs SMETS2 smart meters: what is the difference?How SMETS1 and SMETS2 smart meters differ, why it matters when you switch supplier, and what it means for Octopus smart tariffs.
- What happens to your smart meter when you switch to OctopusWhether your smart meter keeps working when you switch to Octopus, why some older meters go dumb, and what to do about it.
- Octopus smart meter not sending readings: what to checkWhy a smart meter stops sending readings to Octopus, how to check it, and how to keep your bills and smart tariff on track while it is fixed.
- What is Octopus Energy? Tariffs and how it differsA plain-English introduction to Octopus Energy: who it is, the kinds of tariff it offers, and how to find the right one for your home and region.
- How to submit a meter reading to Octopus EnergyWhere to send an Octopus meter reading, how often to do it, how to read each type of meter and what to do when a reading looks wrong.
- Can you refuse a smart meter?Whether you can say no to a smart meter, what changes when an old meter must be replaced, and what you give up without one.
Primary sources
- How to get cheaper, greener energy with our open API — Octopus Energy; checked 2026-10-30. Using the Octopus API and half-hourly consumption data.
- Your smart home just got smarter with Agile Octopus and IFTTT — Octopus Energy; checked 2026-10-30. Where to find the API key, MPAN and meter serial number in the online account.
- The best ways to track your energy consumption — Octopus Energy; checked 2026-10-30. Usage views in the Octopus app and account.