Lol.....sry Tesla has been a idol of mine since I was seven.
He wasn't a crackpot, he was just viewed and lived in the shadow of Eddison. The real crackpot
Eddison focused on DC, Tesla on AC. For the amount of discoveries and applied data Eddison gave us Tesla gave us exponentially more.
He for one patented the induction motor, which he then sold to Westinghouse. To this day the Induction motor is used in every home, every office building, every chemical or industrial plant
He pioneered the use of electro-magnetic induction. Transformers, whether they're hanging on a pole out side your home or stuffed into every electronic component you own they're part of everyday life for all of us.
He built a wireless transmiter called the Wyecliff Tower, he pioneered the study of tuned circuits and he built the Tesla coil.
I tried to build a Tesla Coil when I was 14 and was about 75% through before my Dad figured out what I was doing and destroyed it, and grounded me.
Eddison wanted to power the world with DC. Imagine 6" diameter power lines buried underground with boosting stations every mile.
Tesla was the true genius, he was decades ahead of his time and he was robbed.
As far as using any of his devices for energy conservation its being done already. The basic " switching power" supply which uses a switching transistor to output a saw tooth waveform into the primary side of a transformer are extremely efficient.
And they're in every Computer, flat screen tv or electronic device you own.