{"schema_version":1,"chart":"frequency","description":"Index of all JSON data files of the Energy-Charts 'frequency' chart. File paths are relative to base_url. Timestamp convention: in the time series data, each timestamp marks the beginning of the period it represents.","base_url":"https://www.energy-charts.info/charts/frequency/","generated":"2026-07-21T21:00:30Z","file_count":41267,"format":"compact","note":"Compact format: instead of listing every file, 'patterns' describes the directory structure as path templates. {dir} stands for one of the values in dir_values; {n1}, {n2}, ... are integers within the inclusive [min, max] ranges in number_ranges (zero-padded as shown in 'example'). Not every combination of values necessarily exists as a file. Irregular files are listed explicitly under 'files'.","patterns":[{"template":"data/de/day_{n1}_{n2}_{n3}_{n4}.json","file_count":39724,"total_size":5718370911,"last_modified":"2026-07-21T20:59:34Z","example":"data/de/day_2026_07_21_21.json","number_ranges":{"n1":[2022,2026],"n2":[1,12],"n3":[1,31],"n4":[0,23]}},{"template":"data/de/day_{n1}_{n2}_{n3}.json","file_count":1542,"total_size":4341996769,"last_modified":"2026-07-21T20:58:39Z","example":"data/de/day_2026_07_21.json","number_ranges":{"n1":[2022,2026],"n2":[1,12],"n3":[1,31]}}],"files":[{"path":"data/de/example.json","size":73139,"modified":"2022-06-21T11:09:54Z"}]}