Even if the sky is overcast, PV still produces electricity. This is because PV cells use not only direct sunlight, but also diffuse solar radiation, which is light that has been scattered by dust and water particles in the atmosphere. The amount of useful electricity generated is proportional to the intensity of light energy which falls into the conversion area. However, you can still have an electricity supply even without the sun!
If you install an electricity-generating technology from a renewable or low-carbon source such as solar PV or wind turbine, the UK Government’s Feed-in Tariffs scheme (FITs) could mean that you get money from your energy supplier.
You can be paid for the electricity you generate, even if you use it yourself, and for any surplus electricity you export to the grid. And of course, you’ll also save money on your electricity bill because you’ll be using your electricity.