Environment · head-to-head
Danish data service Energi vs National Grid ESO
Energi Data Service is the Danish transmission system operator Energinet's open-data platform, publishing dozens of live datasets — day-ahead power prices, grid emissions, consumption, and more — as a free public JSON API with no key required. Its older Elspotprices dataset was retired after the Nordic market's move to 15-minute settlement on 2025-09-30, superseded by the still-live DayAheadPrices dataset.
This is Great Britain's electricity system operator's open-data portal, publishing generation mix, demand forecasts, and grid balancing datasets. The operator was transferred to public ownership and rebranded the National Energy System Operator (NESO) on 1 October 2024; the old data.nationalgrideso.com host no longer resolves at all, with the same CKAN data portal now living at neso.energy/data-portal. Its real CKAN gateway at api.neso.energy returns Access-Control-Allow-Origin: * on every response, resolving cors unknown -> yes.
| Danish data service Energi | National Grid ESO | |
|---|---|---|
| Authentication | None | None |
| Pricing | free | free |
| Formats | JSON | JSON, CSV |
| CORS | no | yes |
| HTTPS | Yes | Yes |
National Grid ESO supports CORS, while Danish data service Energi doesn't — pick National Grid ESO for direct browser calls.