If you joined the former Npower Group, or are treated as having joined it, during the following periods, you are now part of the Npower Main Section, of the E.ON UK Group of the ESPS:
- on or after 1st April 1997 but before 1st September 2003
- on or after 1st April 1988 but before 1st April 1997
- before 1st April 1988