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Yesterday, UK wind generation hit a new milestone of 23GW for the first time ever, a year to the day since we hit 22GW and smashing the record set a few weeks ago, maxing out at 23.8GW.

UK electricity generation on 5 Dec 2025

I've uploaded the latest station usage data to the site. Overall usage has finally passed its pre-pandemic level. London Liverpool Street retains its title as the busiest station in the country, Elton and Orston is now the least used station

I've uploaded the latest house price data for England and Wales to the website. Prices continue to be in positive territory, although I'd guess in the next month or two, they'll be going down. The number of sales continue to fall

The latest postcode data from the ONS is now available on the site. Everything looks in order but let me know if you find anything amiss

The latest house price data from the Land Registry is now on the site. More of the same, low sales, prices up annually but moving downwards

It's that time of the month again when the Land Registry release their house sales data for England and Wales. The website has been updated and the data shows prices still increasing slightly on an annual basis but looking to be going down over a shorter time frame. Sales are still in the doldrums.

Things are more interesting at the regional level. Most of the areas with falling prices are in the South and the ones with rising prices are mostly in the North. This is the first time I can remember this being the case.

The data on my UK electricity generation page is automatically updated every day. A couple of months ago I was looking at the latest update and noticed some of the top level records had changed but not on the previous day. It's not unusual for recent data to get updated but now the data was saying a number of electricity generation records had been broken on 26th June 2023, over 2 years ago.

Initially I thought this was an error in the data and it would be corrected at some point but here we are 2 months later and the data remains the same. So what's up? Why was the data updated and why so long after the actual event?

I did some Googling for uk electricity generation 26th June 2023 but nothing turned up. I also did a search on Bing and my page came up as the top result so that's nice but it couldn't tell me anything special about that day. I even tried asking ChatGPT, which proved even less useful. 

So all we can do is look at the data for the day and for the previous day. The 25th was a good day for solar and wind generation and as the sun disappeared, gas started to ramp up as it usually does. But at 6pm, gas generation started to fall fairly dramatically until 10pm. Then it continued to fall but at a much slower rate. This continued until 5:30am on the 26th, when gas reached virtually zero generation. After this, things fairly rapidly returned to normal.

So what happened? Why did gas generation reach a new record low that we've never got close to again? One possibility is that this a data glitch, but why was did it appear in the data set two years after the event? One reason this looks like it could be the correct answer is that it doesn't look like we were actually producing enough power during the evening of the 25th (although it is possible we were importing more than usual).

But a more interesting theory is that this was actually an experiment to see how the grid coped with mostly clean energy sources. It's my undersanding that electricity generation that involves turbines helps keep the grid's AC frequency in sync, so there have been some questions about how we deal with that when most of our electricity comes from renewables. The fact this weirdness happened in the middle of the night and the gradual withdrawal of gas from the mix gives some credence to this theory. And if that is what happened, the fact we haven't come close to these low levels of fossil fuel usage again may suggest the test was not completely successful.

Anyway, I am going to ask NESO what is happening with that day's data and will let you know if I get a response.

Update - I got a response from NESO. The data is wrong, nothing of interest happened in the world of electricity generation on 26th June 2023. 

I've updated the postcode data on the site with the latest ONS data. There are problems with the locations of 15 new Northern Irish postcodes, which I've removed for the moment. This is something of an improvement from the last release which initially misplaced all Northern Irish postcodes. If you spot any other problems, let me know

Much quicker this month, England and Wales house price data for July 2025 is now on the site. More of the same, prices creeping up (although possibly going negative some time soon) and a low number of sales

A little late this month due to me being busy, but the house price data for England and Wales has been updated on the site. Prices still seem to be finding their new level after the Stamp Duty change and sales volumes still seem to be in the doldrums