I use the the Aeon Home Energy Meter for this. I have one clamp on the dryer and one on washer. Unfortunately I don’t think they are available new any more(???). Some on ebay but little pricey… https://www.ebay.com/sch/i.html?_from=R40&_nkw=aeon+home+energy&_sacat=0&rt=nc&LH_BIN=1