D5

The Wardenclyffe Tower was Tesla’s most ambitious project yet. His goal was to provide free energy and wireless communication globally by utilizing the charged layer of the atmosphere known as the ionosphere. Although the physics is complex, Tesla intended to use his Tesla coil to send an electrical pulse into the ionosphere that would then flow around the Earth and distribute electrical energy along its path. By using the Earth’s natural resource, he hoped to provide the world with free electricity. The construction of the Wardenclyffe Tower commenced in 1901, but unfortunately funding fell short and the tower was demolished in 1917.

https://blogs.unimelb.edu.au/sciencecommunication/2014/10/05/nikola-tesla-the-man-who-lit-up-the-world/