What is the "off-side engine generator" on an A320? For the A320 family, is the "off-side engine generator" the same as the "emergency generator driven by the RAT"? I can't find the location of the "off-side engine generator" on the A320.
Offside simply means opposite, and it's to do with the AC bus supply priority.

For the A320 the priority is:


Onside, e.g., left engine IDG for AC BUS 1
External power
APU
Offside, e.g., right engine IDG for AC BUS 1, meaning the left engine's IDG has failed or taken offline.