Question:
Which employer did Johannes Teyssen work for in Feb, 1999?

Context:
 Johannes Teyssen works for E.ON SE from Jan, 2001 to Dec, 2022. 
 Johannes Teyssen works for PreussenElektra from Jan, 1989 to Jan, 1998. 
 Johannes Teyssen works for Hastra from Jan, 1998 to Jan, 1999. 
 Johannes Teyssen works for Avacon from Jan, 1999 to Jan, 2001.

Answer:
Avacon