It's a very valid point that the annual energy cost of running a computer can now be a significant part of the "total cost of ownership" (probably always been true, but rising energy costs vs. 500W PC GPUs have bought it home) and Apple Silicon Macs win big on power consumption.
I'd just point out, though, that even if you need the sort of high-end GPU power you can get in a tower PC (and which Apple Silicon struggles to match) you don't need to run that 24/7. If your super-gaming-workstation PC is using $3000 worth of electricity a year then its worth paying for a laptop or Mini PC to use as your daily driver. There's a lot of Mini PCs around now, and while they're not quite as power-frugal as a Mac Mini they're a lot better than an old-school tower PC and very capable.
That's where the price comparisons get sticky - I see
plenty of Ryzen 7 Mini-PCs for around ÂŁ500. OK, the first impression is "the Mac Mini doesn't cost much more and makes this look like a noisy bucket of spare parts with a fugly great power brick" - but then you look at the specs and see that the PC comes with 32GB RAM, 500GB of SSD
and can be upgraded with regular SO-DIMMs and M.2 sticks, and pretty soon the comparable ÂŁ600 Mac Mini you want has doubled in price, while the power difference is more like ÂŁ50/year for the Mac vs. ÂŁ150/year for the Mini PC. Plus, if you really did want a day-to-day web browser/wordprocessor/casual gaming/file server then there are much cheaper, down to ÂŁ200, Mini PC options which might not bear comparison with the Mac Mini
but will get the job done.