It's interesting just how little rooftop area needs to be covered with panels to provide power for a house. Modern solar panels have gotten a lot more efficient than they used to be.

Our whole house is powered by 12 solar panels, covering < 20% of total roof surface. Each block of 4 is about 7x10 ft. The house next door had panels installed ~2014. They have 20 of them, covering maybe 30-40% of the roof's surface. In 6 years, efficiency basically doubled and price fell by about 3-4x.

Solar panels are on the new Moore's Law.