You can think about these alternative energy sources as a form of alternative supply to reduce your regular bills. You can gather energy during daytime and them at night.
You should attempt to alternative energy options along with your current energy supply. Generally, you can't depend exclusively on renewable power sources right now to provide the energy needs of your household.
The good thing is that you can always save electricity and reduce your monthly bills. Here are a few tips that one could follow if you want lower regular bills on electricity.