Sure. Usually a device that clamps onto each phase of the main power feed and sends that info to a local/remote datastore for recall/analysis. Tells you as little as "I'm using X watts now" to sorting out usage using signatures into individual devices.
My home has a radio-connected "smart meter" that also has Zigbee capabilities.
For $45 I bought a USB/Zigbee dongle that spits out XML-formatted information from the meter. With no change to my wiring I can monitor whole-house usage with about 4 watt-hours of resolution.
But I don't really do much with it. I thought about putting together a little LCD panel that shows consumption vs grid price (I opted to pay real-time prices). But I still don't know what benefit it would have unless I really wire the whole house to use that data (e.g. turn off lights, turn the A/C up, etc). When prices spike the utility already sends me phone/email notifications to reduce consumption.
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[ 4.3 ms ] story [ 24.4 ms ] threadhttps://guide.openenergymonitor.org/technical/resources/
https://sense.com/
https://blog.kroy.io/monitoring-home-power-consumption-for-l...
For $45 I bought a USB/Zigbee dongle that spits out XML-formatted information from the meter. With no change to my wiring I can monitor whole-house usage with about 4 watt-hours of resolution.
But I don't really do much with it. I thought about putting together a little LCD panel that shows consumption vs grid price (I opted to pay real-time prices). But I still don't know what benefit it would have unless I really wire the whole house to use that data (e.g. turn off lights, turn the A/C up, etc). When prices spike the utility already sends me phone/email notifications to reduce consumption.