A wind turbine comprising: - a wind turbine tower having a top; - a nacelle coupled to the top of the wind turbine tower, e.g. via a yaw system; - a rotor hub rotatably mounted to the nacelle; - one or more wind turbine blades having a tip end located in the opposite end of a blade root configured to be mounted to the rotor hub, where the wind turbine blade (5, 11) comprises a pressure side connected to a suction side via a leading edge (18, 22), wherein the wind turbine blade (5, 11) further comprises a first shell part having a first trailing edge connected to a first inner surface facing a second shell part, wherein the second shell part has a second trailing edge connected to a second inner surface facing the first shell part, wherein the second trailing edge of the second shell part is coupled to the first inner surface of the first shell part so that the first shell part forms an extended shell section where the first trailing edge of the first shell part defines the trailing edge of the wind turbine blade, characterised in that - the extended shell section is configured as a flexible shell section for passive load reduction at variable wind speeds where the first trailing edge is configured to move from a first position to a second position in a direction towards the suction side relative to the first leading edge when an incoming wind is acting on the pressure side of the wind turbine blade, and - wherein the chord of the wind turbine blade has a relative length of 1 and the extended shell section has a relative width of at least 0.10, and wherein the extended shell section has a continuous profile along the length of the wind turbine blade. - a wind turbine tower having a top; - a nacelle coupled to the top of the wind turbine tower, e.g. via a yaw system; - a rotor hub rotatably mounted to the nacelle; - one or more wind turbine blades having a tip end located in the opposite end of a blade root configured to be mounted to the rotor hub, where the wind turbine blade (5, 11) comprises a pressure side connected to a suction side via a leading edge (18, 22), wherein the wind turbine blade (5, 11) further comprises a first shell part having a first trailing edge connected to a first inner surface facing a second shell part, wherein the second shell part has a second trailing edge connected to a second inner surface facing the first shell part, wherein the second trailing edge of the second shell part is coupled to the first inner surface of the first shell part so that the first shell part forms an extended shell section where the first trailing edge of the first shell part defines the trailing edge of the wind turbine blade, characterised in that - the extended shell section is configured as a flexible shell section for passive load reduction at variable wind speeds where the first trailing edge is configured to move from a first position to a second position in a direction towards the suction side relative to the first leading edge when an incoming wind is acting on the pressure side of the wind turbine blade, and - wherein the chord of the wind turbine blade has a relative length of 1 and the extended shell section has a relative width of at least 0.10, and wherein the extended shell section has a continuous profile along the length of the wind turbine blade. - the extended shell section is configured as a flexible shell section for passive load reduction at variable wind speeds where the first trailing edge is configured to move from a first position to a second position in a direction towards the suction side relative to the first leading edge when an incoming wind is acting on the pressure side of the wind turbine blade, and - wherein the chord of the wind turbine blade has a relative length of 1 and the extended shell section has a relative width of at least 0.10, and wherein the extended shell section has a continuous profile along the length of the wind turbine blade.