energycap

Household energy and HVAC monitoring

energycap is a personal, single-household energy monitoring application. It is run by one person, for one home — their own. It is not a commercial service, it has no customers other than its operator, and it is not accepting sign-ups.

What it does

Every 30 seconds it records circuit-level electrical measurements from the home's own metering equipment (Leviton smart load centers) and telemetry from the home's own HVAC system (Bryant Evolution). Those readings are stored as a private time-series archive so the operator can answer questions about their own house: what a given circuit actually costs to run, how much of a bill the heat pump is responsible for, whether a change to the thermostat schedule paid for itself.

Why it asks for Green Button data

On-premises measurements only tell half the story. The utility's own metered interval usage is the authoritative record of what the household is billed for, and comparing the two is the whole point: it validates the on-premises readings, and it accounts for whatever the sub-metering does not cover.

Green Button Connect access is requested for the operator's own utility account only. See the privacy policy for exactly what is retrieved and how it is handled, and Green Button Connect for how to authorize or revoke access.

How it is built

One long-running process on a machine in the house, writing to local storage and to the operator's own private cloud storage account. The source code is public: github.com/ericpullen/energyDataCapture.

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