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Share your energy with the electricity community

WattKeeper links the homes of a local electricity community (in French, a Communauté Électrique Locale, or CEL), so a sunny roof’s extra power finds a neighbour who can use it.

What it does

  • Each home publishes its solar surplus automatically.
  • Neighbours reserve that power, from one home or several, for instance to charge a car.
  • Every home has its own tamper-proof digital identity, recognised by the community’s administrator.
  • A community dashboard shows who is online, what is on offer and what is reserved.
  • The system measures how well each home keeps its commitments.
  • Sharing can follow fixed time slots, from 5 to 60 minutes, or run continuously.

How it works

  1. The administrator creates the communityOnce, from the Azure portal in a web browser. Nothing to install on their computer.
  2. Each member joinsThey install WattKeeper in Home Assistant and send the administrator their home’s ID and public key.
  3. The administrator approves the homeThey send back an access key, which the member pastes into Home Assistant.
  4. Homes start sharingProducers offer their surplus automatically. Neighbours reserve it when they need it.

Good to know

  • Someone has to be the administrator. They create the community once and approve each new home.
  • The shared data lives in an Azure storage account, which costs a few cents a month.
  • Your home only makes outgoing connections, so there is nothing to open on your router.
  • The guide on GitHub is written in French.
  • This is an independent project with an MIT licence. Use it at your own risk.

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