Is there any way to reduce the effects of static electricity on the grounds in a Capresso conical burr stainless steel grinder? The grounds appear to be charged and tend to stick to the plastic when emptying the container.
Try putting a couple of drops of water in your coffee beans before putting them in the grinder's hopper. Known as the Ross Droplet Technique.
As an electrical engineer for any kind of such problems I can advise proper ground. I mean the electrical one this time. :) Anti static gloves may help (Google it). However, the static electricity always occurs by friction, it's natural and you cannot get rid of it completely.
I have the same grinder, and I find that the static builds up more with the amount you grind. For everyday AeroPress use, I don't grind enough per use for it to build up static, but when I cold brew a whole 12oz of coffee, I grind the whole bag in batches. This builds up a lot of static due the the bin being plastic, and it's annoying to clean as it flies all over the counter.
I wouldn't recommend using water on the beans before grinding because even though the burr grinder is stainless steel, it is not rust-proof. So thinking long term, I would simply recommend keeping the batch size lower than the max line on the plastic bin. I wouldn't use water to clean the steel grinder either. Only use a brush and you can even pre-grind a tiny amount of throw-away grounds to clear the old grounds out.
A clean up is usually in the cards for when I make coffee anyways, and a little bit of grounds isn't going to trip me up, but I share your frustration.