{"activeVersionTag":"latest","latestAvailableVersionTag":"latest","collection":{"info":{"_postman_id":"49bffe9d-874c-4229-8d69-e9123f0d05f0","name":"API V2.0 Documentation","description":"## Getting Started\n\n[Energy-Data.io](http://Energy-Data.io) is a REST API. Send a GET request. Get degree days back as JSON or CSV.\n\n**What it calculates:** Heating Degree Days, Cooling Degree Days, or both - daily, monthly, or yearly, for any location, from 1970 to present.\n\n**What you need to start:**\n\n1. An active [Energy-Data.io](http://Energy-Data.io) account ([energy-data.io/register](http://energy-data.io/register))\n    \n2. Your email address - this is your API credential (`user_id`)\n    \n3. Your monthly call allowance - check it at [energy-data.io/dashboard](http://energy-data.io/dashboard) before running large queries\n    \n\n**What are degree days?**\n\nA degree day measures how far the daily temperature fell from your base temperature. If it is 10°C outside and your base temperature is 18°C, that is 8 HDD for the day. Accumulate those over a month or year and you have a measure of how hard the building worked.\n\nBase temperature defaults vary by region: 18°C in most of Europe, 15.5°C in the UK, 65°F in the USA.\n\n## Authentication\n\nEvery request requires your registered email address as the `user_id` parameter. This identifies your account and tracks usage against your monthly call allowance.\n\n`?user_id=your.email@example.com`\n\nYour email must match the address on your [Energy-Data.io](http://Energy-Data.io) account exactly. No separate API key is required.\n\nIf you receive a `401 Unauthorized` response, check for typos or confirm your account is active\n\n## Rate Limits\n\nEach plan includes a monthly allowance of API calls. The number of calls a request consumes depends on the calculation method:\n\n- Mean method: 1 call per request, regardless of date range\n    \n- Min/max method: 1 call per request\n    \n- Integration method: 1 call per 15 days (a 365-day query uses 25 calls)\n    \n\n**Plans and call limits:**\n\n- API Essential: up to 6,500 calls\n    \n- API Advanced: up to 25,000 calls\n    \n- API Enterprise: up to 45,000 calls\n    \n- Enterprise Plus: custom volume - contact us\n    \n\nNeed more calls mid-month? Purchase a one-off top-up or upgrade your plan from your account settings. If you exceed your allowance, requests return a `429` error until your limit 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