I don`t like being controversial, but have you all considered heat pumps?
Compared with merely using electricity to heat a wire, they are up to 300% efficient*. They are not always a simple switch into existing systems, but can be worth the capital investment.
If 100% efficiency is from heating an element, a heat pump can “shift” up to 3 times as much energy.
(like to see this done in imperial measures too!)