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A wind turbine blade having a suction side and a pressure side, which sides are connected at a leading edge and a trailing edge, wherein one or more shape modifiable air foil sections are defined in the area of the trailing edge of the blade, and wherein said one or more shape modifiable air foil se

A wind turbine blade having a suction side and a pressure side, which sides are connected at a leading edge and a trailing edge, wherein one or more shape modifiable air foil sections are defined in the area of the trailing edge of the blade, and wherein said one or more shape modifiable air foil sections are attached to a blade body, each of the one or more modifiable air foil sections having an upper skin and a lower skin, a first one of the upper and lower skin being secured to the blade body, and a second one of the upper and lower skin being slidably movable with respect to the blade body, so that a force is applied to one of said skins cause said second skin to slide with respect to the blade body, so as to thereby modify the air foil shape of the trailing edge.

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1. A wind turbine blade having a suction side and a pressure side, which sides are connected at a leading edge and a trailing edge, the blade including a blade body and one or more shape modifiable air foil sections in the area of the trailing edge of the blade, each of the one or more shape modifia

1. A wind turbine blade having a suction side and a pressure side, which sides are connected at a leading edge and a trailing edge, the blade including a blade body and one or more shape modifiable air foil sections in the area of the trailing edge of the blade, each of the one or more shape modifiable air foil sections having a pressure skin and a suction skin, the suction skin being secured to or integral with the blade body, and the pressure skin being slidably movable with respect to the blade body, the blade further including an actuator for applying a force to one of said skins that causes said pressure skin to slide with respect to the blade body, so as to thereby modify the airfoil shape of the trailing edge, wherein at least 10% of the length of the trailing edge, when measured from a tip portion to a hub portion of the blade, is shape modifiable, and whereinthe shape modifiable portion of the trailing edge is closer to a tip portion of the blade than to a hub portion thereof. 2. The blade according to claim 1, wherein said pressure skin is slidably movable transversely to a longitudinal direction of the blade. 3. The blade according to claim 1, wherein the blade comprises at least one shape-modifiable chamber defined by at least one wall, which forms part of or is connected to one of said skins, so that the pressure skin moves when the force is applied to the chamber wall. 4. The blade according to claim 1, wherein each of the shape modifiable air foil sections comprises a pressure chamber which when pressurized or depressurized provides said force. 5. The blade according to claim 4, wherein the blade comprises a vacuum reservoir and/or a reservoir of compressed air. 6. The blade according to claim 4, wherein the actuator changes the pressure in the pressure chamber of at least one of the air foil sections. 7. The blade according to claim 1, wherein at least 5% of the blade in the direction from the trailing edge towards the leading edge, when measured in a chord direction of the blade, is shape modifiable. 8. The blade according to claim 1, wherein said skins are sufficiently flexible to bend so as to allow the aerofoil shape of the blade to change and sufficiently stiff to resist aerodynamic loads. 9. The blade according to claim 8, wherein the flexibility of the skins is graduated in the chordwise direction of the blade. 10. A wind turbine comprising at least one blade having a suction side and a pressure side, which sides are connected at a leading edge and a trailing edge, the blade including a blade body and one or more shape modifiable air foil sections in the area of the trailing edge of the blade, each of the one or more shape modifiable air foil sections having a pressure skin and a suction skin, the suction skin being secured to or integral with the blade body, and the pressure skin being slidably movable with respect to the blade body, the blade further including an actuator for applying a force to one of said skins that causes said pressure skin to slide with respect to the blade body, so as to thereby modify the airfoil shape of the trailing edge, wherein at least 10% of the length of the trailing edge, when measured from a tip portion to a hub portion of the blade, is shape modifiable, andwherein the shape modifiable portion of the trailing edge is closer to a tip portion of the blade than to a hub portion thereof. 11. The wind turbine according to claim 10, wherein said actuator comprises a vacuum and/or pressure source. 12. The wind turbine according to claim 10, comprising a plurality of blades and one vacuum source connected to at least two of the blades. 13. A wind turbine comprising a tower, one end of which is configured to be secured to the ground, and to an opposite end of which there is mounted a nacelle, the wind turbine further comprising: a driving shaft supported by the nacelle;a rotor being mounted on said driving shaft and comprising a plurality of wind turbine blades, with each blade having a suction side and a pressure side, which sides are connected at a leading edge and a trailing edge, the blade including a blade body and one or more shape modifiable air foil sections in the area of the trailing edge of the blade, each of the one or more shape modifiable air foil sections having a pressure skin and a suction skin, the suction skin being secured to or integral with the blade body, and the pressure skin being slidably movable with respect to the blade body, the blade further including an actuator for applying a force to one of said skins that causes said pressure skin to slide with respect to the blade body, so as to thereby modify the airfoil shape of the trailing edge,wherein at least 10% of the length of the trailing edge, when measured from a tip portion to a hub portion of the blade, is shape modifiable,wherein the shape modifiable portion of the trailing edge is closer to a tip portion of the blade than to a hub portion thereof, andwherein the driving shaft is connected to or forms part of a drive chain, which is connected to a generator, which is supported by the nacelle, and which is configured to convert mechanical energy delivered from the rotor to the driving shaft into electrical energy. 14. A blade for a wind turbine, comprising: a leading edge;a trailing edge;a pressure side between said leading and trailing edges;a suction side between said leading and trailing edges, opposite said pressure side;a fluid chamber;a moveable member in communication with the fluid chamber such that a change in pressure of the fluid in the fluid chamber moves the moveable member for changing the shape of the trailing edge; anda blade body having one or more shape modifiable air foil sections in an area of the trailing edge of the blade, each of the one or more shape modifiable air foil sections having a skin slidably moveable with respect to the blade body. 15. The blade according to claim 14, wherein the fluid chamber is secured to the wind turbine. 16. The blade according to claim 15, wherein the fluid chamber is disposed within the blade. 17. The blade according to claim 14, wherein at least 10% of the length of the trailing edge, when measured from a tip portion to a hub portion of the blade, changes shape as a result of movement of the moveable member. 18. The blade according to claim 14, wherein a part of the skin is adapted to overlap a part of the blade body at an overlap region as a result of the sliding movement. 19. The blade according to claim 18, wherein the blade body defines a recess at the overlap region for receiving the part of the skin. 20. The blade according to claim 14, wherein the one or more shape modifiable air foil sections extend over the entire length of the blade. 21. The blade according to claim 14, wherein the one or more shape modifiable air foil sections extend over one or more portions of the length of the blade. 22. The blade according to claim 14, wherein said one or more shape modifiable air foil sections each has a pressure skin and a suction skin, and wherein the blade comprises a plate hingedly connected to at least one of the pressure skin and suction skin, and the pressure chamber is defined between a wall of the blade body and the plate, and wherein the moveable member is disposed in the pressure chamber. 23. The blade according to claim 14, further comprising a spar forming a pressure reservoir in communication with the fluid chamber, and a conduit connecting the pressure reservoir to the trailing edge. 24. The blade according to claim 14, wherein the moveable member is connected to the fluid chamber.