So we need a not punishing, optional and interesting mechanic for eff modules.
Currently its not punishing, optional, but not interesting (except deathworld, where its a bit interesting, hardly optional, but OP on first tier).
add eff modules to steam turbines is not bad, actually. It's like an upgrade to gain more power without increasing UPS.
Problem is, that the most ideas are just, plug it in and *magic*: more power. Not so interesting, maybe?
My opinion is still, make balance for the deathworld case better.
If the pollution cloud gets bigger, you would have to move the labs again and again