The search engine has teamed up with German power company E.On to map the country and calculate solar fall. The project currently covers 40 percent of all German homes, totaling some seven million buildings with a focus on densely-populated areas like Berlin, Munich, Rhine-Main and the Rhur. Locals can simply type in their address to be given Google's estimate of the potential costs and return of the project.

The tool is also being added to E.On's solar sales website and will, hopefully, encourage more people to make the switch. Germany is leading the way in the fight against climate change, and in 2016, a full third of its energy came from sources such as wind, solar and hydro. The country's efforts have been so successful that there is a pleasant "trail of blood" running across the local coal industry.