How do solar panels save energy cost?
Solar panels create energy directly from sunlight, which is free! Normal energy is usually created using sources which are limited (such as fossil fuels), solar energy does save those resources. It is because of using these sources that your energy bill is high.
The main benefits of solar energy therefore is a resource that is free (the sun) and is also unlimited. As you generate your own energy at almost no cost, you will save a lot on your energy bill.