Will Rooftop Solar Panels Make Solar Farms Obsolete?

Solar energy is becoming increasingly reliable, to the point where it is technically possible to run a house on 100% solar. But does that mean that rooftop solar panels can make solar farms obsolete? Not exactly, because residential homes are certainly not the most energy-consuming buildings out there.

We live in the age of data centers, and when you realize how many solar panels it takes to power one, it's clear there's still a strong need for dedicated solar farms. A 100-megawatt solar farm can take up 640 acres of land, so you'd have to cover at least that same area of rooftop in solar panels to render the farm obsolete. More, in fact, because utility-scale solar is more efficient than rooftop solar panels installed across scattered instances of private property.

However, one benefit is that solar panels can be installed on practically any type of rooftop. And if every building had rooftop panels, solar farms could become obsolete. Consider this: the largest solar farm in America is in the Mojave Desert and covers more than 4,600 acres. The nearby city of Las Vegas has 44,000 acres of conveyed or developed land, so it's easy to imagine that the solar farm would be redundant if rooftop panels were placed on every urban building within the city limits.

The biggest obstacle that's keeping solar panels from occupying every rooftop is a lack of public policy. Individuals and businesses need a regulated way to transfer excess solar energy to the grid. There would also need to be standardized pricing for solar-related services and utilities.

Without a government-offered incentive to install solar panels, many people are deterred by the high upfront cost and long payback period. After all, one caveat of installing home solar panels is that it can take up to 15 years for the panels to pay for themselves. Commercial installations tend to recoup costs faster, but it's still an expense not everyone is willing to take on.

But what if every commercial and residential building were actually required to have rooftop solar panels to help power the grid? It would require everyone to adopt methods to make solar power more efficient. Namely, everyone would need to reduce shade on their property and keep solar batteries on hand for storing excess power. Neither is particularly desirable or practical, so it may still be a long time before solar farms are rendered obsolete.