This is the first of my favourite web things: the World Electric Guide. The guide has been an invaluable resource when doing travelling so many times but is also my first address whenever new Blinkenlights ideas come up. The guide is very complete and comes with a lot of illustrations explaining which power system and type of plugs to expect where.

The overview page Electricity Around the World is a very detailed description of the systems and plugs in each country of the planet. It’s not only helpful but also quite telling as it shows relationships of countries based on colonial history or other influences.