obsyd (Python client)

A pandas client for the OBSYD public data API — a free a free European power desk over the official European power record (ENTSO-E, Energy-Charts CC BY 4.0, GIE). 37 bidding zones, day-ahead prices at the market's real 15-minute resolution, load/residual load, generation mix, cross-border flows. Descriptive, not a forecast. AGPL-3.0. No API key.

Install

pip install obsyd            # + pip install obsyd[parquet] for bulk pulls

Use

from obsyd import Obsyd

ob = Obsyd()  # or Obsyd("https://your-self-host")

# One series, one zone → DataFrame (tz-aware UTC index)
df = ob.series("price.dayahead", "DE_LU", start="2024-01-01", resolution="daily")
df["value"].plot()

# The last week of prices across every zone — a single request
wide = ob.snapshot("price.dayahead", hours=168)

# 15-minute auction resolution (SDAC trades quarter-hours since Oct 2025)
qh = ob.series("price.dayahead.qh", "DE_LU", start="2026-07-01")

# Generation mix, capacity, named units
mix = ob.genmix("ES", resolution="daily")
cap = ob.capacity("DE_LU")

# One series over many zones (polite pacing built in)
res = ob.series_multi("residual.actual", ["DE_LU", "FR", "ES"], start="2026-01-01")

# What exists: series keys, zones, coverage window, freshness
ob.catalog(); ob.zones(); ob.status()

Methods

df.attrs carries series/zone/unit/attribution where known.

Errors — the client raises, it never returns silently-empty frames

• ObsydNoData — the API has nothing for this query (.reason holds the server's explanation, e.g. unknown series or empty coverage window).
• ObsydRateLimited — 429 after built-in retries (public API ≈ 120 req/min/IP; the client retries 429/5xx with exponential backoff, max_retries=3).
• ObsydBadRequest / ObsydServerError — 400 / 5xx with the server's detail.
• ValueError — unknown zone key, with close-match suggestions (guards against a server-side silent fallback to the default zone).

Requests are sent with a obsyd-python/<version> User-Agent.

Examples

Executable notebooks in examples/: quarter-hour prices, solar capture rates & negative-price hours, cross-border flows.

Full API reference: docs/API.md or the interactive docs at https://obsyd.dev/api/docs.

Development

pip install -e ".[dev]"
python -m pytest -q          # mocked, hermetic
python -m pytest -m live     # smoke against obsyd.dev (before releases)

Releases: bump __version__ in obsyd.py, merge, push tag client-vX.Y.Z — GitHub Actions builds and publishes to PyPI via Trusted Publishing.