When you can store electricity more directly instead of the (inefficient) conversion to and from heat it is just crazy to not do so. With electricity, thanks to

When you can store electricity more directly instead of the (inefficient) conversion to and from heat it is just crazy to not do so. With electricity, thanks to heat pumps you can "move" heat instead of producing it, which makes heating a lot less expensive since the "efficiency" can often reach 300-400%. For that reason you want to keep using electricity for as long as possible in most cases. Of course, if you have a huge source of cheap heat the equation might change. In such cases you might still want to use some of the heat to get higher temperature heat. (https://en.wikipedia.org/wiki/Absorption_heat_pump https://en.wikipedia.org/wiki/Absorption_heat_pump) And no, it will not help too much if you use a heat pump before storing the energy in this facility. You still have huge conversion losses, the volume for low-temperature heat storage will be huge. If you want high temperature storage your heat pumps will need more stages and run less efficient.