Brinefield Storage Limited | 2nd September 1993 to 15th February 1994 |
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Gretton Limited | 15th February 1994 to 9th December 1994 |
United Gas Services Limited | 9th December 1994 to 4th May 1999 |
Aquila Energy Trading Limited | 4th May 1999 to 9th January 2002 |
TXU Europe (AET) Limited | 9th January 2002 to 9th October 2003 |
Powergen Retail Gas (Northwest) Limited | 9th October 2003 to 4th December 2007 |
E.ON Energy Gas (Northwest) Limited | 4th December 2007 to current |