Cut to the chase
The bit that everyone seems to skate around is: carbon based energy is going to get inexorably more expensive, either because it comes out of the ground or from stuff that grows on the ground. In either case there is limited availability and what there is will diminish.
Therefore energy has to be obtained from other sources and the devices that use said energy will have to modified or replaced by things that can utilise its replacement (basically electricity). Several things flow from this:
1) Wind is not much use unless there is a significant storage system associated with it.
2) Solar is better but does not work at night so you need still storage and also large area electricity distribution (both to cope with nights and placing PV cells in places with lots of sun).
3) Tidal is yields regular but constantly moving periods of max generation. These periods will not coincide with energy need precisely very often. More storage and/or wide area transport required.
None of the above are realistically capable of any more than a fraction of the UK's base load requirements so what is there to replace carbon based energy production? That actually exists today?
Well, there is nuclear. Pity it is old fashioned and inefficient U235 but it exists and it works. Thorium based reactors show much better potential both for efficiency and lack of by products - but don't really exist commercially. So we are stuck with French designs.
Er.. that's it. There is nothing else. Other than, at last noting what is mentioned in points 1-3 and maybe doing something about storage and wide area distribution. Both eminently doable, but need development.
Dunno what we are going to use to go and see the family in Oz though.. Back to tea clippers?