Hi, diesel electric over other engine types, they can run at any revs (down to about 10rpm), easy adjustments (plus 1 rpm minus 1 rpm no problem), faster response time to changes, higher starting torque available, very quick to change from shut down to Standby, can be left in propulsion mode while at anchor, the required space for the engine room is smaller than most other systems,(ie more cargo).
Ian, Chief on a LNG tanker with a 39.9 MW plant and 28 MW of propulsion power.