Should I worry about the power difference between 16GB and 32GB of RAM?

No, the power difference is negligible — we’re talking 1-3 extra watts under load with 32GB. Your CPU can spike 100+ watts, and even case fans use more. For a normal desktop or gaming rig, you won’t notice the power bill or heat difference. Get the RAM you actually need; your GPU and CPU are where the real power goes.