An idea to increase power demand could be giving science something that requires a lot of power to use. That way science can bug engineering to beef up the engine to support their experiments. Other departments getting ways to use surplus power would be good too but the only other department I can think of who could have something is mining, some kind of giant drill that wires to the power network maybe? Again so engineering has a reason to whack up the power.
Something else to look into is doing something with the tesla engine. I don't know enough about the in depth mechanics though to really suggest something meaningful, only that you hardly see it used and it'd be nice to see it used instead of or along side the SM engine sometimes.