We have solar panels for your roof that can be connected to the electricity grid and can halve the electricity bill for your house.
One can easily follow through a phone app or a computer which panels produce the most energy during the day.
What is needed is enough ceiling space to place at least eight panels of the size 200x100cm, Less than eight panels do not provide enough power and energy and are therefore not an economically justifiable investment.
Correctly placed solar panels can more than halve the electricity bill depending on how large the electricity bill is. It requires a permit from the municipality and you can negotiate with your electricity company and sell the over-produced electricity to the Spanish state and the repayment period is shortened, and this is great for the environment.