It depends on how big the "gadget" has to be and who owns the "gadget." For example, hydroelectric power is free, but someone has to build the dam, the generators, and the distribution system.
Nuclear is free, if someone gave you a small, personal nuclear plant and set it up for you.
You mean like solar panels? It's not a one time payment, if you keep having to replace the "machine" when it wears out. Also, unless it's solar, the "signal" has to be sent from somewhere, which also costs. And to send to all homes, there would have to be a corporation to set up the transmitter. There are always costs. Nothing is ever free.
It depends on how big the "gadget" has to be and who owns the "gadget." For example, hydroelectric power is free, but someone has to build the dam, the generators, and the distribution system.
Nuclear is free, if someone gave you a small, personal nuclear plant and set it up for you.
There are always "ifs" involved.
This would be like a machine that sits outside your house that receives energy like a signal. A one time payment.
You mean like solar panels? It's not a one time payment, if you keep having to replace the "machine" when it wears out. Also, unless it's solar, the "signal" has to be sent from somewhere, which also costs. And to send to all homes, there would have to be a corporation to set up the transmitter. There are always costs. Nothing is ever free.