An apparatus for concentrating electromagnetic waves originating from a moving source to a fixed focal point, comprising: - an imaginary hemisphere capable of rotating about its fixed centre; - an electromagnetic wave concentrating device which concentrates incoming normal electromagnetic waves to its focal point, said electromagnetic wave concentrating device being impeded in said imaginary hemisphere such that its focal point coincides with the centre of the hemisphere, wherein said electromagnetic wave concentrating device rotates around said imaginary hemisphere's centre so as to keep its focal point fixed to the ground, wherein said concentrating device is a reflective parabolic dish - a receiver located at said focal point; - a rotatable platform , placed on wheels and rotating controlled by a side motor to follow the azimuth angle of the sun, having two supports having joints and being fixed to said rotatable platform ; wherein said electromagnetic wave concentrating device is held by two arms ; wherein said apparatus further comprises a support supporting the receiver on the ground and being fixed with respect to the said platform ; wherein the support is provided with a passageway for circulating a material to or from the receiver , characterized in that : said arms are freely joined to the two supports so that the arms are free to swing around joints of the supports , and in that to control the motion of the electromagnetic wave concentrating device, a rope is connected to opposite edge of said electromagnetic wave concentrating device and the other end is wrapped around a platform motor fixed to the platform , wherein by pulling or releasing the rope, the platform motor controls the tilt angle of said electromagnetic wave concentrating device to normally face the sun. - an imaginary hemisphere capable of rotating about its fixed centre; - an electromagnetic wave concentrating device which concentrates incoming normal electromagnetic waves to its focal point, said electromagnetic wave concentrating device being impeded in said imaginary hemisphere such that its focal point coincides with the centre of the hemisphere, wherein said electromagnetic wave concentrating device rotates around said imaginary hemisphere's centre so as to keep its focal point fixed to the ground, wherein said concentrating device is a reflective parabolic dish - a receiver located at said focal point; - a rotatable platform , placed on wheels and rotating controlled by a side motor to follow the azimuth angle of the sun, having two supports having joints and being fixed to said rotatable platform ; wherein said electromagnetic wave concentrating device is held by two arms ; wherein said apparatus further comprises a support supporting the receiver on the ground and being fixed with respect to the said platform ; wherein the support is provided with a passageway for circulating a material to or from the receiver , characterized in that : said arms are freely joined to the two supports so that the arms are free to swing around joints of the supports , and in that to control the motion of the electromagnetic wave concentrating device, a rope is connected to opposite edge of said electromagnetic wave concentrating device and the other end is wrapped around a platform motor fixed to the platform , wherein by pulling or releasing the rope, the platform motor controls the tilt angle of said electromagnetic wave concentrating device to normally face the sun. <EOS>