API documentation
US Nuclear Outages API
Since 2007The daily health of the US nuclear fleet: total capacity, megawatts on outage and the outage percentage — one point per calendar day since 2007, no gaps.
500 req/mo · No credit card required · One key, every API on the platform
- Checking status…
- Every day since 2007 — 7,100+ points, no gaps
- capacity_mw · outage_mw · outage_percent
- Refreshed daily (same morning, ET)
- Latest point 0–1 days old
Base URL & authentication
All endpoints live under one base URL. Authenticate every request with your key
in the X-Api-Key header — no OAuth, no signing. The same key works
on every API of the platform.
# Base URL {{GATEWAY_URL}} # Every request X-Api-Key: sk_live_YOUR_KEY
Missing or invalid keys return 401 — see
errors. The demo endpoint is the only keyless route.
Endpoints
All paths relative to the base URL. Every 200 ships ETag,
Cache-Control and RateLimit-* headers.
| Method | Path | Summary |
|---|---|---|
| GET | /nuclear/latest Free+ | Latest daily state of the US nuclear fleet |
| GET | /nuclear/history Free+ | Paginated daily history of the US nuclear fleet |
No path parameter — two fixed routes: /nuclear/latest and /nuclear/history. History: start/end (YYYY-MM-DD, keyset via meta.next_end), limit 1–100 (default 30).
Sample — 200 /nuclear/latest
{
"data": {
"period": "2026-07-20",
"capacity_mw": 97621.1,
"outage_mw": 1410.477,
"outage_percent": 1.44,
"source": "EIA"
},
"meta": { "source": "U.S. Energy Information Administration" }
}
Errors, auth & limits
One uniform error contract everywhere:
{ "error": { "code", "message" } } with stable,
machine-readable codes — shared by every API on the platform.
| Status | Code | When |
|---|---|---|
| 401 | UNAUTHORIZED | Missing X-Api-Key header, or invalid/revoked key. |
| 400 | VALIDATION_ERROR | Bad query/path parameters. |
| 404 | NO_DATA · NOT_FOUND | No data for the requested range yet, or unknown route. |
| 429 | RATE_LIMITED | Per-minute limit of your plan exceeded — check Retry-After. |
| 429 | QUOTA_EXCEEDED | Monthly cap reached. Nothing is billed on top — resets on the 1st (UTC). |
| 502 | UPSTREAM_ERROR | The origin API was unreachable — retry shortly. |
Data provenance
EIA daily nuclear outage series, derived from the NRC daily power reactor status reports and published by the EIA every morning (ET). Units: megawatts for capacity and outages, percent 0–100 for the outage share. This product is not endorsed by or affiliated with the EIA.
Example
curl -H "X-Api-Key: sk_live_YOUR_KEY" \ https://api.synergicapis.com/nuclear/latest
import requests
r = requests.get(
"https://api.synergicapis.com/nuclear/latest",
headers={"X-Api-Key": "sk_live_YOUR_KEY"},
)
r.raise_for_status()
print(r.json()["data"])
const res = await fetch("https://api.synergicapis.com/nuclear/latest", { headers: { "X-Api-Key": "sk_live_YOUR_KEY" }, }); const { data } = await res.json(); console.log(data);
Live demo
Real request against the production API — no key needed here (demo endpoint, 5 requests/minute).
Press the button to fetch the latest official figures.