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Re: Re: Sustainable energy (09/07/18 20:40:32)
    Gravity energy may be harvested, but it is difficult and expensive:

    Here I feel the tyranny of size. Huge installations, much landscape architecture.

    Solar energy - photovoltaics - to me represent the freedom of the bottom because quantum phenomena are involved. Let the sun excite one atom, and you may harvest one electron.

    In countries with expensive electricity and much sun, solar power stations (photovoltaic) are already profitable, they tell me.

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