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Buildenergysmart meterprivacy

Turn any smart meter CSV into clear charts in a single HTML file, nothing uploaded

Half-hourly smart meter data can be downloaded free through services like Bright and n3rgy, but what you get is a giant spreadsheet, and people keep asking on supplier forums how to export and use it. Build a drag-and-drop viewer that shows when you actually use energy, without your data ever leaving your machine.

Posted 4h ago by The Unsolved team

Once solved, this helps households.

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A solution must include

  1. Single HTML file under 300KB, charting code included
  2. Accepts CSV exports from at least three sources (for example Bright, n3rgy and a supplier export)
  3. Daily, weekly and time-of-day heatmap views
  4. Estimates cost from a unit rate and standing charge the user enters
  5. Zero network requests after load

How it’s verified: Live URL plus the HTML file; Sample CSVs for each source in a public repo; Screen recording with the network tab open.

The first valid solution wins.

The first solution that meets every criterion wins. No end date: open until solved.

Money is held in 75-day rounds. If a round ends without a winner, everyone who added money gets their bounty money back on their card. A bounty under $50 is refunded instead of paid out.

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