Maybe all transportation other than recreational, exercise or physical self transportation? Where older methods would continue. Yet, I don't see electro-plasma as the power source primarily, but rather the movement. I do recall electro-plasma was feeded by Trek Anti-matter engines... or possibly Fusion engines before that. Anti-matter warp engines generated ionized gas(plasma). I think Fusion power was used by expending heat to ionize the gas, and coincidently also probably used the same fuel source(molecule not phase state). Fision reactors could do some work, if you drove them across a motor to generate the current and also utilize the heat generated... I do not know if a Fision reactor would provide enough power... if it does, you'd be using it to feed a contained electrolysis.
Fision takes a bit of water... but if the electrolysis occurs, you maybe could use that water... didn't they come up with an anlysis that radioactivity of the fission would kill everyone on board by the time they got to Jupiter? You might need a containment.
else: the crew is experiencing Spock's Kobimashimaru