I've just learned a new term "Passive Housing".

Maybe one day all new houses will be constructed this way.

My other half and me have been working on a plan to do much of this.

We want to move into a well insulated eco home with a south facing roof covered in solar panels, maybe have a small wind turbine fitted, have a power wall battery installed and a heat pump for heating. 

Run the house and car from the generated power and if possible go off grid all together.

Grow much of our food in the garden and retire happy, we plan to retire ASAP. 

It's a dream we both have but I think the technology is all there now, it is doable for sure