Abstract: A wind power installation, according to one aspect, comprising a pylon which is secured to a foundation, a generator, a container, wherein the container is disposed within the pylon, and a transformer to transform electrical energy provided by the generator to a higher voltage, the transformer disposed in the container. The wind power installation further including a sensor to generate data which is representative of the salt content in air within the pylon and/or within the container and circuitry to provide data which is representative of the salt content to a remote location.