How to install solar panels at home – to save the Earth and your bank account

With solar energy becoming cheaper - and federal and state authorities offering tax credits and other incentives - now is a good time to switch

• Climate change in the US: the dangers and the solutions - about this series

Installing solar panels on the roof of your home is a big project - but it can pay dividends in more ways than one. There's the obvious environmental benefit, but for many homeowners, the joy comes with a dollar sign attached.

Turning your home into a mini power plant can save you good money on the electric bill. Here is a guide to get you started.