I'm not even touching heat pumps. But I do have to say that "loss of efficiency" in a supermajority of case is by... heat. Pretty much all the electricity that

I'm not even touching heat pumps. But I do have to say that "loss of efficiency" in a supermajority of case is by... heat. Pretty much all the electricity that enters your house leaves it as heat. Heaters at 50%? I guess, if you use a long wave radio as an electric heater. Otherwise it's just 99.99%. And if you mean electricity _generation_ is 50%, well, say so. That's a completely different topic, and electricity generation method are varied enough to make any single number meaningless. How do you calculate efficiency of hydro?