Sorry to say but this has been done years ago.... if you look at various altcoins that offered the same things with similar names you will see quite high set accomplishments that never succeeded in what they aimed for, what differs this ?
What backing does it have besides the various incomes you hope to attract through this said project linked to a crypto currency ?
It takes quite a lot of solar panels and batteries to store energy for a single household plus they are very pricey, if you were to sell energy how would you do it and where would you set up your grids ? What regulations would you attend by per you Countries Laws for Energy Regulation on private selling of energy including taxes, etc ?
The whole world over has several examples of individuals that use solar power on online.
And for the most they sell their excess power generated from solar or other type of energy generation.
All excess energy is sold back to the same energy company that would normally give household electricity.
Example: USA simply build your solar powered panels and then as proof they will come and arrange the sale of your excess power to them to sustain the network in your area of sale.
This is common practice all over the world!