NRGI / Forsyning (Smart meter data)
Smart meter data from Danish energy utilities — citizen access via MitID through the DataHub API.
Energi Data Service is operated by Energinet (the Danish national energy transmission operator) and provides open APIs for energy market data. Covers electricity spot prices, consumption, production by source (wind, solar, etc.), CO2 intensity, and grid measurements. Fully public with no authentication required. Data is updated in real-time or hourly.
Fully public REST API. No auth required. Real-time and historical data. Excellent documentation. Widely used in the Danish energy sector.
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Smart meter data from Danish energy utilities — citizen access via MitID through the DataHub API.
Evida's gas-grid data API — verified against a real OpenAPI spec, but company-only, no citizen consent flow.
Developer portal for TDC Net, Denmark's telecom-infrastructure arm of Nuuday — wholesale APIs, account required.