National Renewable Energy Laboratory · Rate Limits

National Renewable Energy Laboratory Rate Limits

NREL APIs are fronted by the api.data.gov gateway and apply per-API-key rate limits for signed-up keys and per-IP limits for the shared DEMO_KEY. Per-service variation is possible (some APIs publish their own quotas), but the platform default is 1,000 requests per hour. Counters reset on a rolling hourly basis; 429 is the throttling response.

National Renewable Energy Laboratory Rate Limits is the machine-readable rate-limit profile for National Renewable Energy Laboratory on the APIs.io network, in the API Commons Rate Limits shape.

It captures 3 rate-limit definitions, measuring requests_per_hour and requests_per_day.

Limit state is signalled in the limit and remaining response headers, and an exhausted limit returns HTTP 429.

This profile was written by API Evangelist and has not been verified against a page the provider published; treat every limit as unconfirmed until a dated transcription replaces it.

The profile also includes 4 backoff/retry policies defined and response codes documented for throttled and quotaExceeded.

Tagged areas include Rate Limiting, Government, Energy, and Renewables.

3 Limits Exhausted: HTTP 429 Quota: 429 limitremaining
Method: generated, dated 2026-05-05.
Written by API Evangelist on 2026-05-05 and not verified against a page the provider published. Treat every limit as unconfirmed until a dated transcription replaces it.
View Source
Rate LimitingGovernmentEnergyRenewables

Limits

Signed-up API key (default) key
requests_per_hour · hour
1000
Default for all signed-up keys across every NREL API; some services may publish their own caps.
DEMO_KEY hourly IP
requests_per_hour · hour
30
Shared demo key — limit is per IP address, not per key.
DEMO_KEY daily IP
requests_per_day · day
50
Shared demo key daily ceiling per IP.

Policies

Rolling window
Hourly limits reset on a rolling basis. After a 429 block, the key automatically resumes service within an hour.
Demo vs signed key
DEMO_KEY is for documentation / tutorial use only; production traffic should use a free signed-up API key.
Service-specific overrides
Some NREL APIs document their own per-service quotas; consult the individual API documentation page when those are stricter than the gateway default.
Domain migration
developer.nrel.gov is being retired in May 2026. Consumers should migrate to developer.nlr.gov to avoid disruption.

Sources

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Tools for rate limits

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  • find_rate_limitsBrowse and filter every rate limit in the catalog.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
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Call it yourself

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curl "https://apis.io/api/v1/rate-limits?limit=25"

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