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Electric heat is only 100% efficient at the point of use. The best thermal power plants have maybe 50% efficiency, plus there are transmission losses. Even solar panels only convert a small fraction of sunlight to electricity, not that it matters much when sunlight is free.
Coin operated radios were once common in hotels, I have a 1940s Karola (made in Minneapolis) coin operated radio. I think it gives you an hour for a dime. The cabinet is heavy steel to deter theft.
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