Batteries. Like I said 
2 Points
The environmental impact of batteries is much worse than what carbon dioxide can cause, not to mention degrading and disposing of them once they finally fail.
There was a system I saw somewhere that uses an electric motor to lift a heavy weight to store energy, then allows the weight to descend during hours of demand. I thought it was a brilliant option that is far more Eco-friendly. Sure, you can’t do that with a phone or a car… but a series of cement slabs hoisted during the day by solar power and allowed to descend while spinning a turbine? Yeah, I can see a benefit in that.
2 Points
or, batteries in the concrete slabs hoisted during the day by solar power and allowed to descend while spinning a turbine, creating power and allowing the batteries to trickle charge 24/7.
I think there must be a little energy lost in heat due to the mechanics but otherwise it sounds pretty good if it’s well set up. Be good to have a link!
That is a mechanical battery - something that’s existed in history for thousands of years and yeah it sounds like something we should account for
1 point
Yup, that’s the point. The use of counter weights can be used to re-hoist the blocks.
1 point
Yes, I also agree 
1 point
Glad we’re all on the same page. Who’s going to tell apple?
1 point
2 Points
1 point
So cool - you could dig a pit in the garden for those, I imagine
Or even attach it to the back of your car! I’m such a genius
Mobile phones… wrist watches… man, this is perfect