Privacy policy

energycap · last updated 18 August 2026

energycap is a personal, single-household energy monitoring application operated by Eric Pullen. It has one user, who is also its operator and the utility account holder whose data it processes. This policy describes what it collects and what happens to it.

What data is collected

On-premises measurements from equipment in the operator's own home: circuit-level electrical readings and HVAC status and energy telemetry.
Utility metered usage, retrieved through Green Button Connect My Data for the operator's own utility account: interval electricity usage, the associated meter and usage-point identifiers, and the reading metadata that accompanies them.

No data is collected about any other person, household, or utility account. No usage analytics, advertising identifiers, or tracking of any kind are collected, and these pages load nothing from any other host.

How it is used

Solely to produce the operator's own energy history and analysis of their own home: comparing utility-metered usage against on-premises measurements, attributing consumption to circuits and equipment, and reviewing changes over time.

How it is shared

It is not. Data is never sold, rented, licensed, published, or shared with any third party. It is not aggregated with, benchmarked against, or combined with any other customer's data — there are no other customers. No advertising or marketing use is made of it, and it is not used to train any model or service offered to anyone else.

The only circumstance in which data would be disclosed is a legally binding demand, and disclosure would be limited to what the demand actually compels.

Where it is stored, and for how long

On a computer in the operator's home and in the operator's own private cloud storage account, under access controls that permit only the operator. Credentials and access tokens are held only on that machine's local storage with owner-only file permissions, and are never written to logs or to the public source repository.

Because the purpose is a long-term energy history, data is retained indefinitely unless the operator deletes it. On revocation of Green Button access, retrieval stops immediately; already retrieved data remains in the operator's own archive, which is their own record of their own consumption.

Revoking access

Green Button Connect authorization can be withdrawn at any time from the utility's My Meter site, which stops all further data sharing. See Green Button Connect for details.

Security

All data transfers use HTTPS. Access tokens are stored with owner-only permissions on the collecting machine and are refreshed rather than re-authenticated. The application's source code is public, so its handling of credentials and data can be inspected directly: github.com/ericpullen/energyDataCapture. Automated tests specifically assert that credentials and tokens never reach log output.

Changes to this policy

Material changes will be reflected in the date at the top of this page. Since the application has a single user, who is its operator, changes affect no one else.