Power plant having a heat storage medium and a method of operation thereof

A power plant for generating electricity comprising an energy source, turbines to convert energy from said energy source to electricity, a high temperature heat reservoir and a low temperature heat reservoir, said high temperature heat reservoir being solid and being connected to receive at least some of said electricity generated by said power plant, said high temperature heat reservoir being heated by electricity, said low temperature heat reservoir being connected to be heated by receiving steam from said turbines, said reservoirs being connected to return heat energy to said turbines, with a controller for said power plant to operate said power plant to store energy in said reservoirs during off peak power periods and to transfer heat directly from said low temperature heat reservoir to said high temperature heat reservoir and directly from said high temperature heat reservoir to said turbines during high peak power periods, said turbines being connected to produce electricity from said heat energy.