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The data
Everything this site runs on is public and free, and so is everything we publish from it. What takes the work is getting it into a state you can use, and that is what is here.
What we hold
The Ofgem installation report is published as three spreadsheets of about 108MB with the geography, technology, capacity, commissioning date, tariff code and export status of every accredited installation. The tariff table is published separately, as a workbook with a sheet per eligibility band. Neither is usable as published, and joining them correctly is most of the job. Our method sets out exactly how it is done, including the two parsing faults we found on the way.
Free downloads
These are published under the same Open Government Licence as the source, and you may use, republish and build on them. A link back is welcome and not required.
| File | What it contains | Rows |
|---|---|---|
| uk-fit-rates-2026-27.csv | Every published rate for 2026-27, by band, technology, capacity and efficiency requirement | 943 |
| uk-fit-by-constituency.csv | Installations and installed capacity by Westminster constituency | 633 |
| uk-fit-by-local-authority.csv | Installations and installed capacity by local authority | 369 |
| uk-fit-by-postcode-district.csv | Installations and capacity by postcode district, with council and region | 2,645 |
Cuts we do not publish
The published files are aggregates. The underlying join carries a good deal more, and some of it is only useful to people doing a specific job:
- Capacity bands by area, so a territory can be sized by system size rather than by count.
- Commissioning date profiles, which tell you when the installations in an area reach the end of their terms.
- Export status by area: which installations are deemed, which are metered, which have no export payment at all.
- Tariff-code distributions, which is the closest available proxy for what an area is currently being paid.
- Technology splits beyond the 860,477 solar installations: wind, hydro, anaerobic digestion and micro CHP.
Who this tends to be for
What we will not provide. There is no personal data in the Ofgem register and there is none here. It is anonymised to postcode district, and we will not supply, model or infer anything that identifies a household. If you are looking for a list of people to contact, this is not that and we cannot help.
Asking for a cut
Email editor@ownergy.co.uk and say what you are trying to work out, rather than what fields you want. It is usually a shorter conversation that way, and quite often the answer is already in one of the free files above.
If it is a small amount of work we will do it and publish it for everyone rather than send it privately, because a reference work is worth more than a favour. If it is a substantial piece of processing, or you want it delivered on a schedule as new quarters are published, we charge for that. Say what you need and we will quote.