61.5% sounds like a lot, but how much electricity is needed to replace everything that fossil fuel is now used for? I think it needs to increase to 400% or so to do that.
An ICE car is 20-30% efficient, an EV is 90% efficient. Generally we are looking at a grid expansion, but it is not massive.
See this amazing chart on rejected vs. useful energy:
An EV is 85-90% efficient with power coming out of the batteries. However, the charging efficiency of the batteries is at about 80%. So the overall efficiency is 80% of 90%, or 72%.