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What sci fi movie (could have been a "TV" movie) was set in a cavern & dealt with electricity generation?

The struggle in the movie was "cowboy inventor dude" vs "evil corporation". Protagonist is a Robert Redford like dude maybe?.?

It might have had something to do with the sonic properties of the cavern harmonics?.?

I believe there might have been some large "Tesla coil" style lightning special effects during the destruction of the invention (but I could be conflating different movies together.)

Maybe in the 80's?.? (or late 70's / early 90's)?

Thanks! 😃

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  • 3
    Not the power generation segment of Forbidden Planet?
    – Lexible
    Sep 7, 2019 at 14:53
  • 1
    @Lexible thanks for your suggestion, I checked it out; but it wasn't that old (or that movie.)
    – George 2.0 Hope
    Sep 9, 2019 at 0:22

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