preciousbunny The pond and stream are also cleaned using electricity from solar panels. Why don't you say : The pond and stream are also cleaned (by) using electricity from solar panels. " There's absolutely no doubt about the meaning.
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preciousbunnyThe pond and stream are also cleaned using electricity from solar panels.Both versions are correct, but it's better style to omit the "by."
Why don't you say :
The pond and stream are also cleaned (by) using electricity from solar panels.