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Speed to Power is built on data published by the Dutch grid operators themselves.

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Network operators

  • TenneT — the national transmission system operator, running the high-voltage grid and publishing congestion status per feeding area
  • The six DSOs — Liander, Stedin, Enexis, Coteq, RENDO, and Westland Infra run the regional and medium-voltage networks and publish congestion and capacity data for their service areas
Together these cover the entire Netherlands: every postcode is served by exactly one DSO and fed from a TenneT area, and both show up in that postcode’s dossier.

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Refresh cadence

Grades are recomputed after every national congestion snapshot, so the map reflects the operators’ latest published state rather than a quarterly report. Each area page shows when its data was last refreshed.

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What this data can and can’t tell you

Operator-published congestion data is the best public signal of where the grid has room, and it’s the same signal a DSO will check first when you request a connection. What it doesn’t contain is the private queue: individual pending requests ahead of yours. Treat a good grade as a strong prior, not a guarantee — and a bad grade as a near-certain queue.