What is the most the used Electricity Generation Method?

Question

Is it Hydro, Nuclear, Thermal, Coal or Natural gas?

According to this It's Coal, But I'm not sure if it's outdated or not, This is only in the USA and in 2006

http://en.wikipedia.org/wiki/Image:Sources_of_electricity_in_the_USA_2006.png

Answer 1

http://en.wikipedia.org/wiki/Image:World...

Since oil is not at all primarily used for electricity generation, coal would be it. (As your graph also supports.)