I am trying to come up with a fun planet with "advanced" but primitive tech. We all know Tesla missed some critical physics when envisioning his global transmission network for power. But what if things were different?
What conditions could exist on a habitable planet that would allow the planet to function as a giant Tesla coil, powering wireless devices, OR allow the people on the planet to charge the planet in a way similar to what Tesla was envisioning? Could a planet, for example, have a rapidly spinning nuclear-powered natural core and appropriate metals to simulate the needs of such a device? A moon orbiting or spinning rapidly inside the magnetic field of another planet? A metallic world like in A Boy and his Tank? It can be a weird and unlikely anomaly, but naturally possible. It can be a world that was at some point terraformed, but capable of supporting a civilization with tech advancing through the 19th and 20th centuries. If short-lived, the effect should last long enough for a civilization to work it's way through an advancing civilization (say, 10,000 years). The less people need to do to make this work, the better. People will be basically human, but if slight alterations are needed (increased radiation resistance within reasonable limits, for example) that is acceptable. Bonus points if the planet itself generates the power used naturally.
"That won't work," is acceptable with appropriate details.