Loss of both DC generators in an ATR 42 or 72 is regarded to be an emergency. This video explains why.

Links to relevant ATR videos:
Introduction to the electrical systems:    • ATR electric systems  an introduction  
Aural alerts:    • ATR systems  Aurals from the warning...  
Engine failure at takeoff:    • ATR 72600 engine failure procedure  

Credits:
Airbus:    • Come fly with us  Farnborough Airsho...  
ATR:    • ATR 72600 Prototype  Air to Air  
Boeing:    • Boeing 73710 and 7779 Flight Demons...