In the UK there is competition, there are a lot of different electricity vendors like Southern electricity, British Gas, EDF.
Comparison is always difficult, and there there is never a simple answer to how much is costs per kw/h. Some have daily standing charges, others don't. Some electricity has tiered pricing.
My latest bill from British Gas charges 25p for the first 107 units, and 11p for the next 151 units.
That's an average cost per kw/h of around 17p, including all taxes (there are no standing charges).
That's close to 20 cents.
If I used a lot more electricity, the average price per kw/h would go down.
How much is a kw/h in Ireland for a domestic user?