The amount of electricity you can save with a photovoltaic system depends on various factors, such as the size and orientation of the system, the location, sunlight exposure, and your own electricity consumption. However, a well-planned and installed photovoltaic system can cover a significant portion of your electricity needs and help you reduce your electricity bill. In some cases, it might even be possible to generate more electricity than needed and feed it back into the grid, leading to savings or revenues from feed-in tariffs.