I wanted to write renewable energy, but theoretically speaking all energy is non-renewable.
Eventually our trusted Sun will expand, gobble up the Earth whole solar system, maybe more then it will become Dwarf and I don’t remember what will happen next (I am not much into the subject, just brush stroke info), but our old trusted 'renewable energy' source will be gone.
I heard that there is research on bacteria converting organic matter to oil, but scale is the problem. But this non-renewable energy can be produced as we speak.
So we have bit of a problem, but if we use common interpretation of the matter barriers are clear.
As pointed out we should look at smarter energy usage, rather then blindly follow new solar panel ‘free’ electricity fad.
I wasn’t aware that to produce photovoltaic we use lots of fossil energy, my concern rather was in life expectancy and ‘unexpected’ events like lightning strike, 300k+ wind or cricket-ball-size hail.
I was also impressed with the idea of individual tiles on the roof and bricks in the wall producing electricity. I am not sure how far this fantasy got realised.
But I have to say that campaign to put one more blanket on and jumper in preference to turning up the heater appealed to me too.
Current house designs take into account sun existence and insulation of roof cavity and some wall cavity insulation makes a lot of sense.
We are still to widely adopt double or follow Sweden with triple glazed windows and sliding doors.
As it is now, single glazed windows are the biggest ‘window’ to heat gain-loss.
I love the subject.
And there are many hints to save energy.
Smurf I get the impression that you are the master of this subject.
One hint I liked was to place empty plastic bottle in free space in the fridge.
And smart part of it is that when you open the door, less cold air falls out of the fridge, and poor fridge doesn’t have to work as hard and it costs us less too.