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My washer is pretty low power consumption. I forget what exactly I set the threshold to, but when I did I was watching its output history. It spends a lot of time under 100w, and only irregularly spikes higher.

It is possible to watch much higher-power systems with power clamps--the same magnetic sensor kind you can put on your entire house power feed. I have one on my 220v dryer for completeness, although I never even bothered to rig up automation. There's no real penalty for ignored dry clothes like there is for ignored wet clothes--I guess it'd be useful for people with roommates, though.

Specifics devices will depend on zigbee vs z-wave vs wifi. If I were starting totally fresh, I'd go all zigbee.

If I were starting totally fresh, I'd be paying careful attention to the smart panel setups https://www.leviton.com/en/products/residential/load-centers and what they can do, above and beyond individual outlets.
For whole home power, I use a Rainforest Automation EMU-2.

It’s connected as a USB serial device to integrate into HA. The HA forums have a custom component for it.

This can be useful for monitoring the entire home power. No load center clamps needed, it communicates with my power meter over Zigbee.

I use two TP-Link HS110 outlet plugs for power consumption monitoring for my washer and dryer.

My dryer is gas so I don’t need anything special. Would maybe check out the smart Leviton load center mentioned in this thread for new construction.