received by the International Bureau on 04 December 2014 (04.12.2014)

1. A solar power plant for generating steam comprising:

a receiver including a substantially hollow metal shell, the interior of which is sealed from the outside atmosphere;

a tower extending vertically upwardly from the ground and defining a vertical axis;

said receiver being mounted on said tower adjacent the top thereof;

a plurality of heliostats supported on the ground and surrounding said tower and said receiver, said heliostats directing rays from the sun onto said receiver for heating said receiver;

a spray nozzle within said hollow metal shell of said receiver; means for supplying water from the exterior of said receiver to said nozzle, said nozzle being arranged to spray water onto the interior surface of said hollow metal shell whereby said water is turned into steam;

means for removing the steam generated within said receiver and directing said steam to an instrumentality for using said steam, and

means for rotating said receiver about said vertical axis at least approximately once per hour thereby regularly exposing a different portion of said receiver to said heliostats to prevent said receiver from melting.

2. The solar power plant for generating steam as claimed in Claim 1 wherein said means for rotating includes a motor mounted outside of said receiver.

3. The solar power plant for generating steam as claimed in Claim 2 wherein said motor is mounted on said tower.

4. The solar power plant for generating steam as claimed in Claim 1 wherein said motor means also rotates a portion of said tower. 5. The solar power plant for generating steam as claimed in

Claim 1 wherein said nozzle is toroidal in shape.

6. The solar power plant for generating steam as claimed in Claim 1 wherein said receiver is substantially spherically shaped.