Comment Re:Scale (Score 1) 835
This is a hugh area if used for the sole purpose of installing solar panels. Fortunately there are vast amount of surfaces available without the need to cover additional areas.
I did your calculation before for Switzerland: For the 1.5 million buildings you have to use one square meter of solar panel to replace a nuclear reactor. We have five reactors resulting in about 5 square meters for each building to replace all of them. While this is a huge project it's possible to get a average area of 5 square meters per building.
An this example only take in account buildings. There are more unused surfaces: Avalanche barriers[1], surface parking lots, motorway and rail road borders (maybe even across motorways and rail roads), waste depots, yes even on atomic power plants [2] (while they wait to be decomposed).