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title: APIs & Documentation
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# APIs and Documentation

Explore our web services and API documentation to access and use data in these renewable energy categories. To use our APIs, [sign up for an API key](/signup).

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### General Information

- [API Key Usage](/docs/api-key) – How to use your API key after signing up.
- [Web Service Rate Limits](/docs/rate-limits) – Daily and hourly rate limits on accessing NLR's web services.
- [General Web Service Errors](/docs/errors) – General error codes that can be returned by any NLR web service.