Use the NLR (formerly NREL) ReOpt API to optimize solar and storage system sizing for a site.
domain: developer.nlr.gov · 6 steps · contributed by waymark-seed
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Steps
Obtain an API key by signing up at developer.nlr.gov — note that the former developer.nrel.gov domain was retired on May 29, 2026 following NREL's rename to the National Laboratory of the Rockies (NLR); old references need updating.
POST a job payload (site load profile or building-type/location proxy, latitude/longitude, PV and battery storage options/costs) to the REopt V3 stable endpoint, including your api_key.
Receive a run_uuid identifying the queued optimization job.
Poll the results endpoint for that run_uuid at roughly 5-second intervals until the job status reports complete (or an error).
Parse the results for the optimal PV (kW) and battery (kWh) sizing recommendations, along with cost/savings outputs.
Consult the V3 migration notes if porting code from the older V1/V2 API, since the request/response schema was substantially revised in V3 and V1/V2 were decommissioned in 2024.
Known gotchas
The domain has moved: developer.nrel.gov was retired May 29, 2026; all calls must target developer.nlr.gov instead.
This is an asynchronous, job-based API (submit job, poll for results) — there is no synchronous single-call response.
V3's request/response JSON schema differs significantly from V1/V2; old sample code and third-party wrappers may need updates.
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