A method for controlling the pitch angle of the blades of a wind turbine comprising the following sequence of steps: - measuring an energy storage value of the blades pitch actuation system at predefined values of a first blade pitch angle interval extending between a first pitch angle and a second pitch angle, - comparing the measured values of the energy storage of the blades pitch actuation system with a predefined minimum value of the energy storage, - if the measured values of the energy storage are all greater or equal than the predefined minimum value of the energy storage then enabling operation of the blades pitch actuation system for the entire first blade pitch angle interval, - if at least one of the measured values of the energy storage is lower than the predefined minimum value of the energy storage then: - calculating a third pitch angle at which the energy storage value equals the predefined minimum value and a second blade pitch angle interval extending between the first pitch angle and the third pitch angle, - calculating a third blade pitch angle interval extending between a fourth pitch angle and the second pitch angle, the difference (ΔE2) between the energy storage value at the fourth pitch angle and the energy storage at the second pitch angle being the same of the difference (ΔE1) between the energy storage value at the first pitch angle and the predefined minimum value of the energy storage, - limiting the blades pitch actuation system to operate only in the third blade pitch angle interval. - measuring an energy storage value of the blades pitch actuation system at predefined values of a first blade pitch angle interval extending between a first pitch angle and a second pitch angle, - comparing the measured values of the energy storage of the blades pitch actuation system with a predefined minimum value of the energy storage, - if the measured values of the energy storage are all greater or equal than the predefined minimum value of the energy storage then enabling operation of the blades pitch actuation system for the entire first blade pitch angle interval, - if at least one of the measured values of the energy storage is lower than the predefined minimum value of the energy storage then: - calculating a third pitch angle at which the energy storage value equals the predefined minimum value and a second blade pitch angle interval extending between the first pitch angle and the third pitch angle, - calculating a third blade pitch angle interval extending between a fourth pitch angle and the second pitch angle, the difference (ΔE2) between the energy storage value at the fourth pitch angle and the energy storage at the second pitch angle being the same of the difference (ΔE1) between the energy storage value at the first pitch angle and the predefined minimum value of the energy storage, - limiting the blades pitch actuation system to operate only in the third blade pitch angle interval. - calculating a third pitch angle at which the energy storage value equals the predefined minimum value and a second blade pitch angle interval extending between the first pitch angle and the third pitch angle, - calculating a third blade pitch angle interval extending between a fourth pitch angle and the second pitch angle, the difference (ΔE2) between the energy storage value at the fourth pitch angle and the energy storage at the second pitch angle being the same of the difference (ΔE1) between the energy storage value at the first pitch angle and the predefined minimum value of the energy storage, - limiting the blades pitch actuation system to operate only in the third blade pitch angle interval.