One aspect of solar panels that makes them unsustainable is their upfront cost. Solar panels are expensive to purchase which prevents their adoption by more people around the world. In Australia, the federal and state governments offer price discounts for the installation of solar panels. As solar production technology develops, solar panel production may get cheaper. As a result, solar panels will become cheaper. Cheaper solar panels will increase adoption. Cheaper solar panels will also be more sustainable than expensive solar panels.