source: On June 6, 2010 a weak tornado touched down and damaged the Fermi 2 generator building and forced an automatic shutdown leaving over 30,000 people without power in the area.
target: A weak tornado touched down on June 6, 2010.  It damaged the Fermi 2 generator building.  It forced an automatic shutdown.  It left  over 30,000 people without power in the area.
references: A weak tornado touched down on June 6, 2010.  It damaged the Fermi 2 generator building.  It forced an automatic shutdown.  It left  over 30,000 people without power in the area.