Before spending money on a dedicated energy monitor, it’s worth checking what your utility already offers, since many now provide a free app or web portal tied to your smart meter. The two aren’t the same thing, though, and the gap between them is bigger than it looks.
What utility apps typically show
Most utility smart meter portals show total household usage, usually updated hourly or daily, sometimes with a cost estimate and a comparison to your usage from the same period last year or last month. That’s useful for spotting a big-picture trend — “we used more electricity this July than last July” — but it’s whole-house only. It can’t tell you which appliance or circuit is responsible.
What a dedicated monitor adds
A real-time, circuit-level or device-level monitor (like a Sense, Emporia Vue, or Eyedro) updates far more frequently — often live or every few seconds — and, depending on the model, can identify individual circuits or even specific appliances by their electrical “signature.” That’s the difference between knowing your bill went up and knowing exactly which line item caused it.
When the free option is genuinely enough
If you just want a general sense of trending usage and aren’t trying to troubleshoot anything specific, your utility’s free app may cover what you need at zero cost. A dedicated monitor earns its price when you actually want to diagnose something — an unexpectedly high bill, a suspected phantom load, or preparing your home for solar or an EV charger and wanting to understand your existing baseline first.
Wondering how an energy monitor fits with a smart thermostat, EV charger or backup battery? Our Whole-Home Energy Calculator adds up the whole setup: the electricity it adds or saves each month and the net change on your bill.