eagle #49, incorrect.
The RJ has 2 engine driven generators (engs 1 and 4), and 1 (non essential) on the APU; this is the Normal power level.
AC and DC power can be supplied from a hydraulically powered generator (green system) from either of the 2 hydraulic systems (engs 2 and 3) via a power transfer system. This is the Essential level of power.
There is also a Std By static inverter from the battery (second optional) supplying the Emergency level flight instruments.
Thus the aircraft is exceptionally well supported electrically, enabling flight without any power generating systems.
All other airframe systems have sufficient redundancy to enable an emergency landing without any generated electrical power.