Imagine having to bring your house "up to current legislation", and have it passed by an independent inspector every time you wanted to visit.

it would cost thousands.

It's intersting to see the prices across the EU and the breakdowns.

Just about a year ago I asked Iberdrola to change my tarrif to the lowest (think it's 7.5amp) on an old house I very rarely visit,done with no mention of disconnection.Maybe it depends on which company and which office.

You can change your tariff at any time - you can even do it online in some cases. Disconnection and reconnection is an entirely different scenario.

That's a bit misleading though. In reality most people could switch and pay less + the figures don't seem right. I'm in Ireland and never paid more than 14.8.

I don't think that chart takes standing charges into account - puts Spain a lot higher I suspect.

It would be difficult to include it as it is variable, however if you took the average consumption and average potencia it could produce an average figure.

That said, 23 cents/Kwh is on the high side so maybe it is included.

At the end of the day it doesn't matter what others pay. Every time somebody is willing to pay more , means you get a better deal.
https://comparador.selectra.es/electricidad

I think potencia charges must be included. I'm currently paying 0.14805 pkwh for electricity (with 5% discount on consumption), and am about to switch to a slightly cheaper tariff with the same supplier under which I will pay 0.12550 pkwh (potencia charge will be the same), neither of which are anywhere near 23 cents pkwh. There is no mention of the charge pkwh being different during different time periods, and the offer is currently advertised on the supplier's website.

The chart is illustrative not definitive and I think it's probably reasonable to assume it compares flat rates by state run suppliers ignoring potential 3rd party deals.

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The "quotation" from 2017 is meaningless. There is no explanation of the data used to come by the data illustrated in the chart. One other point prices are not the latests available.

Here is the latest figures (and explanations) from Eurostat As you can read the page explains the changes to the way the information, it's definitions of the consumer and the methodology behind the published data.
Full explanation on what data was used here
However, remember that prices went up in October 2019 and are not included in the Eurostat figures. Link in Spanish
Maybe have a play with this chart.
The last column is for the first half of 2019.
Data can be configured to show the highest price first with ranking at the top. Remove taxes and the cost per KWH Spain is the highest in Europe (not the EU)
Play around with things like power Consumption, Include Taxes etc. To do this use the plus button alongside the boxes.
Links in Spanish:
The largest rise in electricity in Europe: between 2008 and 2018 - 66.8%
EU obliges Spain to 'clean-up ' the electricity bill of charges before January 2020
The fractionation of your electricity bill changing and that is why I originally posted the information.

I received my copy of my new electricity contact today. It confirms that I'll be paying the lower rate of 0.12550 pkwh (plus a discount of 10% on the electricity used for the first year), and there are no different rates for different time periods involved, so the changes outlined in the OP definitely don't affect all new contracts.

Work out the maximum total of KW you are likely to need at any one time. Avoid having the oven, kettle and water heater all on at once for instance !
Then ask your supplier to reduce your 'potencia' to that level. It can save a lot of money, as your monthly standing charge is related to how many KW of potencia you have available.
Increasing potencia involves expensive one off fees and then a monthly charge per KW contracted before you even switch on a light. WARNING, do not agree to change contracts. You're likely to be hit with expensive hidden fees for the pleasure, I was.
If you stay on the same contract number it will be free to reduce potencia or just a small one off fee.
If you have aircon forget it, you'll need plenty of 'potencia'