I don't know what's really going on here, but I suspect we have a clueless reporter. I do not think that electricity is being stored in molten salt. Doesn't make sense.
Heat energy is being stored. That can be used to generate steam, which turns a turbine, etc., etc.
Just typical bad writing by one who doesn’t know the subject matter or care to learn it.
The project proposes to store energy as heat in the molten salt and tap it to run generators, presumably by generating steam to power turbines.
in the article:
SolarReserve’s technology will use a tower with a holding tank of molten salt. An array of mirrors will reflect light onto the tank. The heated liquid is then pumped into a steam generator that will turn a turbine to make electricity.
Not sure why molten salt is a preferred heat store medium though.
I have heard of one proposed technology years ago that could "store" solar energy in salt. How it works is that the salt solution is brought into the focus of a mirror. The heat induces a chemical phase change in the salt. The phase changed salt is chemically stable and can be stored for a long time. In order to use the stored energy, the salt is sent to a boiler and it is melted back into the lower engery state salt, which releases heat, which can be used to power a boiler. I think this method can be used to store energy all sumnmer and release it in the winter.