A recent study conducted by researchers from the Karlsruhe Institute of Technology in Germany has revealed that over 30 million homes in Europe have the potential to fulfill their energy requirements through rooftop solar panels. 

These findings indicate that more than half of Europe's 41 million freestanding homes could have achieved self-sufficiency with solar and battery technology in 2020, and this percentage is expected to increase to 75% by 2050.

Thanks to advancements in solar technology, some of these single-family homes may even find it economically viable to disconnect from the electrical grid in the coming decades. However, the study suggests that, from a macroeconomic perspective, it may be more prudent for households to remain connected to the grid and contribute surplus energy during periods of overproduction.

Lead researcher Max Kleinebrahm, an energy economics researcher at the Karlsruhe Institute of Technology, emphasized that while going off-grid might not be the most cost-effective choice even in 2050, investing in self-sufficient buildings could be a viable option for those who are willing to pay more for self-sufficiency. The study underscores the importance of supporting the grid rather than having a large number of households disconnect from it.