Calendrier Tempo

Today's and tomorrow's EDF Tempo colour, 15-day forecasts and a free API

by jean-pierre

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Oct 9, 2026 Productivity

daily color edf tempo electricity forecast france free api

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Calendrier Tempo is a free website for French households on EDF's Tempo electricity plan, where every day is Blue, White or Red and Red days cost several times more. It shows today's and tomorrow's colour as soon as RTE publishes it, the number of Red and White days left in the season, and our own forecasts up to 15 days ahead, with a public track record comparing past forecasts to the official colours. Developers and smart-home users get a free JSON API with no key or signup (CC BY 4.0), a Home Assistant integration and an embeddable widget. Independent project, not affiliated with EDF or RTE.