Can you generate energy from particles in space?

I am making design of a fictional doomsday weapon which is like a miniature version of Death star's beam. I.e it can rip apart chunks of planet and impart significant change in its mass.

However I also want it to be as much believable in for a future setting as possible instead of something running off magic

So in a distant future from now is it possible to gather energy from charged particles and other quantum phenomenon in outer space except solar panels.

Like the charged particles ejected from solar wind , can they be used for generating a potential difference of the order of several million or billion volts and several million amperes and use it fire the weapon for a short burst.

Just how much energy can you get from particles in radius of a few hundred kilometres in space in our solar system?

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Can you generate energy from particles in space?

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