To be honest the powers that be are not interested in inventions like this.
A balanced and quite honest documentary of Nicola Tesla 16 minutes
Nikola Tesla Explained In 16 Minutes | Best Nikola Tesla Documentary
More to the story - he was murdered
I think Tesla nailed the ultimate of free energy and that he was murdered and then found dead in his hotel room.
I've added the Gib Messenger newsletter to the post that speaks about it.
Trivia as to why Nikola Tesla may have lived the last years of his life at The New Yorker Hotel:
We believe that Tesla chose to live here because at that time The New Yorker Hotel was one of the most technologically advanced buildings in the world, and it is very likely that Tesla often visited the hotel’s giant power plant 70 feet below ground which has been designated a milestone in engineering by the IEEE.
Nikola Tesla and The New Yorker Hotel | The New Yorker Blog
When it was built, the New Yorker Hotel had coal-fired steam boilers and generators sufficient to produce more than 2,200 kilowatts of direct current electric power. At the time, this was the largest private power plant in the United States. The hotel's own direct current generators were still in use during the Northeast Blackout of 1965, but by the late 1960s the hotel's power system had been modernized to alternating current. In a dedication ceremony held on September 25, 2008, The Institute of Electrical and Electronics Engineers (IEEE) named the New Yorker Hotel's direct current power plant a Milestone in Electrical Engineering. A bronze plaque commemorating the achievement was presented to the hotel by IEEE.
Wyndham New Yorker Hotel - Wikipedia