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 (R) positioned at the bottom, in which the light alloy casting-injection system is at least partially housable, wherein the molding system comprises a mold (S) comprising a lower half-mold (S1) and an upper half-mold (S2), wherein the molding system comprises: i) a first lower fixed plate , on which the lower half-mold (S1) is housed, wherein the first fixed plate and the lower half-mold (S1) are fluidly connectable to the casting-injection system; ii) a movable plate on which the upper half-mold (S2) 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 (S) is closed, and a multiplicity of raised positions in which the upper half-mold (S2) is separated from the lower half-mold (S1), 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 (S2), movable by the electric ejector motor in an ejection position in which the casting is detached from the upper half-mold (S2); 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 (S1) is housed, wherein the first fixed plate and the lower half-mold (S1) are fluidly connectable to the casting-injection system; ii) a movable plate on which the upper half-mold (S2) 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 (S) is closed, and a multiplicity of raised positions in which the upper half-mold (S2) is separated from the lower half-mold (S1), 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 (S2), movable by the electric ejector motor in an ejection position in which the casting is detached from the upper half-mold (S2); - an electric ejector motor ; - ejection members operatively connected to the electric ejector motor , to the movable plate , and to the upper half-mold (S2), movable by the electric ejector motor in an ejection position in which the casting is detached from the upper half-mold (S2); 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 . <EOS>