Powergen was a former energy company in the United Kingdom. Originally founded in 1989 as the UK's national energy company, it was privatised just under a year later.
The logo was given a slight tweak in early 2001, which made the 'Powergen' wording smaller and in a different font face. The woman also has fewer waves in her hair, her mouth expression is more obvious and the sun has more rays.
Another slight change was made to the logo in 2003 with the 'Powergen' wording being enlarged again (it looks more similar to the 1989-2001 logo). The company was taken over by E.ON shortly before this logo was introduced, but the name still remained until Spring 2007.