This did start out as a joke. My wife and I have journeyed over much of England and some of Wales looking at more conventional archaeological sites of interest. On our travels, we have seen a few power stations. When I jokingly showed my "power station pictures" to friends and colleagues, quite a few had a few interesting things to say about power stations. I searched the web to identify my nearest power station, and when we spent a Saturday going to look at it we had, apparently coincidentally, a nice day out.
I don't expect there are fanatical "power station spotters" like train-spotters or birdwatchers. There are probably quite a number of people with a slight interest in power stations. I'm one, and if you are one, or would like to be one, I would like to hear from you.
I'm not sure why power stations are interesting, but I have a few ideas. One is that most things are interesting if you actually stop and take a look at them. The world, in both its natural and artificial aspects, has more to it the closer you look, and you will have a much more original experience by looking at your own region more closely, than by travelling a thousand miles and looking at a new place in the same old superficial way.
Alternatively, power stations might be just intrinsically interesting. After all, power generation is essential to our way of life, and represents a complex development of engineering and economics.
Another angle is that, if I can remember my 'O' level Geography, the ideal site for a power station is a large amount of land, away from major population centres, near the necessary fuel (Coal, Natural Gas or whatever), and near plenty of water. This is almost a recipie for a pleasant area. The fact that most power stations are plonked bang in the middle of areas of particular natural beauty is not either coincidence or an evil conspiracy.
I think the first reason is the main one. Do you like power stations? What's your opinion? Let me know