Going to a customer's house and consuming their electric all day isn't going to work out, or having extension cords strung everywhere, where you're literally dropping heavy trees with sharp right angle cuts, and cord snagging brush and branches, and you know, the chainsaw itself which will go through a cord in an instant and if it doesn't you won't be worried about loud noises anymore. Cord powered saws for real crews are not practical at all. That leaves the options - battery powered, and those do not have enough power to cut down large trees (I'm talking about more than falling a tree), or bring your own electric, ie, run a generator, which would be gas powered and just as loud and non-green as gas powered saws and still has the whole cord issue.