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A wind power plant, comprising a tower, a rotor mounted on the tower and having at least one rotor blade, and a power conversion unit, is characterized by a swivel bearing, the swiveling plane of which lies between an approximately horizontal rotor axis (x) and a vertical tower axis (y), at least on

A wind power plant, comprising a tower, a rotor mounted on the tower and having at least one rotor blade, and a power conversion unit, is characterized by a swivel bearing, the swiveling plane of which lies between an approximately horizontal rotor axis (x) and a vertical tower axis (y), at least one motor for swiveling the rotor, along with the power conversion unit, from a first position in which the rotor axis (x) extends at least approximately in a horizontal direction into a second position in which the rotor axis (x) extends at least approximately in a vertical direction.

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1. A wind power plant comprising: a tower having a substantially vertical tower axis (y);a rotor having at least one rotor blade, said rotor having a rotor axis (x);a power conversion unit connected to the rotor;a head support interposed between the rotor and the tower and mounting the rotor on the

1. A wind power plant comprising: a tower having a substantially vertical tower axis (y);a rotor having at least one rotor blade, said rotor having a rotor axis (x);a power conversion unit connected to the rotor;a head support interposed between the rotor and the tower and mounting the rotor on the tower, said head support including a first support element supporting the rotor, a second support element attached to the tower, and a swivel bearing interposed between the first support element and the second support element to enable the first support element to swivel relative to the second support element, said swivel bearing having a swiveling plane which lies between the rotor axis (x) and the tower axis (y); andat least one motor for swiveling the rotor, along with the power conversion unit, by swiveling the first support element relative to the second support element from a first position in which the rotor axis (x) extends at least approximately in a horizontal direction into a second position in which the rotor axis (x) extends at least approximately in a vertical direction. 2. The wind power plant according to claim 1, wherein the swiveling plane lies in an angle bisector between the rotor axis (x) in the first position and the tower axis (y). 3. The wind power plant according to claim 1, wherein the rotor axis (x) and the tower axis (y) intersect in the swiveling plane. 4. The wind power plant according to claim 1, further comprising: means for storing power for the at least one motor, wherein power generated during operation of the wind power plant is fed to the storing means for the power supply of the at least one motor. 5. The wind power plant according to claim 1, wherein the swivel bearing includes a limit position switch for the first and the second positions. 6. The wind power plant according to claim 1, wherein the power conversion unit includes a rotor bearing, a generator, a gearbox, and a brake. 7. The wind power plant according to claim 1, wherein the rotor is a single-blade rotor with one rotor blade and a counterweight. 8. The wind power plant according to claim 1, further comprising: a vertical bearing interposed between the second support element and the tower to enable rotation of the head support about the substantially vertical tower axis (y). 9. The wind power plant according to claim 1, wherein the at least one motor is located within the head support. 10. A wind power plant comprising: a tower having a substantially vertical tower axis (y);a rotor having at least one rotor blade, said rotor having a rotor axis (x);a power conversion unit connected to the rotor;a head support interposed between the rotor and the tower and mounting the rotor on the tower, said head support including a first support element supporting the rotor, a second support element attached to the tower, and a swivel bearing interposed between the first support element and the second support element to enable the first support element to swivel relative to the second support element, said swivel bearing having a swiveling plane which lies between the rotor axis (x) and the tower axis (y); andmeans for swiveling the rotor, along with the power conversion unit, from a first position in which the rotor axis (x) extends at least approximately in a horizontal direction into a second position in which the rotor axis (x) extends at least approximately in a vertical direction. 11. The wind power plant according to claim 10, wherein said swiveling means causes the rotor to be swiveled when a measured or a predetermined wind speed is exceeded. 12. The wind power plant according to claim 10, wherein the swiveling plane lies in an angle bisector between the rotor axis (x) in the first position and the tower axis (y). 13. The wind power plant according to claim 10, wherein the rotor axis (x) and the tower axis (y) intersect in the swiveling plane. 14. The wind power plant according to claim 10, further comprising: means for storing power for the at least one motor, wherein power generated during operation of the wind power plant is fed to the storing means for the power supply of the at least one motor. 15. The wind power plant according to claim 10, wherein the swivel bearing includes a limit position switch for the first and the second positions. 16. The wind power plant according to claim 10, wherein the power conversion unit includes a rotor bearing, a generator, a gearbox, and a brake. 17. The wind power plant according to claim 10, wherein the rotor is a single-blade rotor with one rotor blade and a counterweight. 18. The wind power plant according to claim 10, further comprising: a vertical bearing interposed between the second support element and the tower to enable rotation of the head support about the substantially vertical tower axis (y). 19. The wind power plant according to claim 10, wherein the means for swiveling the rotor is located within the head support.