No, I think not. It does warn about missing data. Looking at other days, the scale appears to be wrong.

This illustrates the challenge with having renewables in the energy mix.

The time point you show is for this afternoon with the sun down (so no PV) and limited wind output. The cost shown will be the wholesale price for buying power right now which indeed is very expensive. Anecdotally, one well known electricity supplier is incentivising domestic customers to use less electricity from 5 PM to 6 PM today - offering to PAY 72 p per kWh saved - this is how attractive some load shedding is, given the high wholesale price.

You get very different numbers already by looking at the whole day (0:00 to 17:00) - averaging a little over £500 / MWh (using the menu buttons at the top of the page).

I'm guessing not. It does, however, appear to be the same as is reported by Elexon on their Open Settlement Data portal.

Flicking back as far as 2023 these values would be anomalous, but theoretically I suppose it's possible if higher-than-expected demand has caused someone's reserve bid to be triggered.

The price is correct.  It reflects the high demand and risk of not having enough capacity on the system.  

Due to lack of capacity the short term prices can be very high, from the Guardian:

Two power station owners to get more than £12m for three hours of electricity | Energy industry | The Guardian

“These are super-high prices,” Walke said. “Our models show that we don’t have a lot of electricity capacity left in the market; there’s not a lot of wind power available and there’s a lack of [cable] interconnection with neighbouring countries.”

Walke warned that Britain should brace for further market price spikes by the end of the week when demand for electricity and weak wind power levels “look more or less the same as today”.

Looks like the other offer of £5000/MWh wasn't taken up then!

   - Andy.

As a bit of background, it seems that the prices quoted by Drax are the "spot" prices - for power to be delivered immediately and looks to consist of about 5% of volume, another 5% is traded a-day-ahead, and the other 90% is by long term contract between generators and suppliers. So only a small fracton of the power in the grid at peek times yesterday would have cost that much.

  - Andy.

Yes, I believe that the price was correct, as a short term peak, not an average.

We need more energy storage, and more renewable capacity to fill that storage. A new and very large pumped storage scheme is proposed at Coire Glas in Scotland, if built such a scheme would avoid paying such high prices for short notice peak power.