A molding system for a low-pressure light alloy casting plant comprising a light alloy casting-injection system, wherein the molding system extends in height along a main axis (X-X) and comprises a base region positioned at the bottom, in which the light alloy casting-injection system is at least partially housable, wherein the molding system comprises a mold comprising a lower half-mold and an upper half-mold, wherein the molding system comprises: i) a first lower fixed plate, on which the lower half-mold is housed, wherein the first fixed plate and the lower half-mold are fluidly connectable to the casting-injection system; ii) a movable plate on which the upper half-mold is housed; iii) a second upper fixed plate, positioned at the top of the movable plate; iv) a movement group suitable for moving the movable plate along the main axis (X-X) between a working position, in which the mold is closed, and a multiplicity of raised positions in which the upper half-mold is separated from the lower half-mold, comprising: - an electric drive motor housed on the second upper fixed plate; - transmission members operatively connected to the electric drive motor and to the movable plate suitable for transforming the rotary motion of the electric drive motor into translational motion; v) a casting ejection group, housed on the movable plate, comprising: - an electric ejector motor; - ejection members operatively connected to the electric ejector motor, to the movable plate, and to the upper half-mold, movable by the electric ejector motor in an ejection position in which the casting is detached from the upper half-mold; vi) a command unit, operatively connected to the movement group and to the casting ejection group, suitable for commanding the operation of the electric drive motor and of the electric ejector motor. i) a first lower fixed plate, on which the lower half-mold is housed, wherein the first fixed plate and the lower half-mold are fluidly connectable to the casting-injection system; ii) a movable plate on which the upper half-mold is housed; iii) a second upper fixed plate, positioned at the top of the movable plate; iv) a movement group suitable for moving the movable plate along the main axis (X-X) between a working position, in which the mold is closed, and a multiplicity of raised positions in which the upper half-mold is separated from the lower half-mold, comprising: - an electric drive motor housed on the second upper fixed plate; - transmission members operatively connected to the electric drive motor and to the movable plate suitable for transforming the rotary motion of the electric drive motor into translational motion; - an electric drive motor housed on the second upper fixed plate; - transmission members operatively connected to the electric drive motor and to the movable plate suitable for transforming the rotary motion of the electric drive motor into translational motion; v) a casting ejection group, housed on the movable plate, comprising: - an electric ejector motor; - ejection members operatively connected to the electric ejector motor, to the movable plate, and to the upper half-mold, movable by the electric ejector motor in an ejection position in which the casting is detached from the upper half-mold; - an electric ejector motor; - ejection members operatively connected to the electric ejector motor, to the movable plate, and to the upper half-mold, movable by the electric ejector motor in an ejection position in which the casting is detached from the upper half-mold; vi) a command unit, operatively connected to the movement group and to the casting ejection group, suitable for commanding the operation of the electric drive motor and of the electric ejector motor.