CZ: Add pumped storage pumping to hydro storage - #8777
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Fetch the CEPS Load data alongside Generation in fetch_production and derive pumping as the difference between the Load including pumping and Load series, so net hydro storage becomes pumping minus pumped storage generation. Load failures degrade to production without pumping instead of aborting the fetch. Also raise the previously-unraised ParserException when the Generation response has no data.
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Issue
Closes #5426
Description
The CZ parser only reported the generation side of pumped storage, so hydro storage was always negative and pumping never showed up. fetch_production now requests the Load method alongside Generation on the same CepsData endpoint and window, derives pumping per interval as the difference between the Load including pumping and Load series, and adds it to hydro storage. Net storage becomes pumping minus PsPP generation, the approach outlined in the issue. Supersedes #5473 and #7530, which both closed for inactivity.
A failing Load request only costs the pumping enrichment: production still returns with generation-side storage, plus a warning. While in here I also added the raise that fetch_production's no-data branch was missing (the exchange twin got the same fix in #8464).
Preview
Live run over the default 48h window: 192 events, 54 intervals with pumping (max 487.9 MW today at 10:45 local), 56 with discharge (max 478.0 MW). Example event at 2026-07-02 10:45: storage {'hydro': 487.933} with PsPP at 0, and at 2026-06-30 20:00: storage {'hydro': -478.0} while pumping was 0.
Double check
uv run test_parser "CZ"pnpx prettier@2 --write .anduv run formatin the top level directory to format my changes.