Every Last Joule · Region record

Switzerland

Provenance, tier, and validation record for switzerland. No live curtailment figures on this page — those are on the globe.

Region id: switzerland
Country: CHE
Waste modality: Solar
Coordinates: 46.80° N, 8.20° E

Measured Data quality

Tier

live-neighbour-anchored · T1c-live-neighbour-anchored

The operator publishes an hourly series, but no domestic rate is published, so the rate is extrapolated from a neighbouring zone.

Live feed, neighbour-extrapolated rate (±35.5% empirical)

Uncertainty

±35.5% of peak GW

Published envelope for this tier. See the uncertainty model.

Source provenance

verified · Verified upstream link

The snapshot value comes from a verified upstream feed or anchor.

Source

ENTSO-E Swissgrid PV-only (hydro spill not in A75)

https://transparency.entsoe.eu/

Tier, provenance, and source are read at build time from src/lib/regions.ts — the same table the globe draws from. The validation record below is generated separately and gated against it by npm run ci:docs-drift.

Validation record

Last updated: 2026-08-20 · Sprint: S1 + HB integration · Paper section: Technical Validation §4.2

Source

Region id: switzerland
Country: CHE
Tier: live-neighbour-anchored
Kind: solar
Source: ENTSO-E Swissgrid PV-only (hydro spill not in A75)
Source URL: https://transparency.entsoe.eu/
Loader: (no single-file loader — see multi-region source)
Structural gap: no

Calibration

Rate source documented in: docs/methodology/ (see links below)
Uniform across backfill years: yes (per HB methodology §"Rate application over time")

Multi-year backfill annual totals

Year	Backfill rows	Backfill annual TWh	Published TSO annual TWh	Δ %	Source
2020	4,991	0.036	—	—	entsoe
2021	4,891	0.038	—	—	entsoe
2022	4,708	0.046	—	—	entsoe
2023	4,897	0.053	—	—	entsoe
2024	4,896	0.065	0.100	-35.5%	entsoe
2025	7,580	0.077	—	—	entsoe
2026	1,876	0.014	—	—	entsoe

Published anchors

TSO annual curtailment (latest published): Swissgrid 2024 PV curtailment ~0.1 TWh; hydro spill not in A75 (excluded from our figure)
Ember annual: —
IRENA annual: —
Other: —

Discrepancy analysis

The 2024 backfill annual total for Switzerland of 0.065 TWh significantly underreports against the published Swissgrid 2024 PV curtailment anchor of ~0.1 TWh, showing a discrepancy of -35.5%. As both our figure and the TSO's published figure are noted to exclude hydro spill, this discrepancy is not definitional concerning that aspect. Instead, it suggests an under-calibration of the applied curtailment rate for PV in Switzerland. The ENTSO-E rate audit did not identify a citable 2023/2024 curtailed-energy total for this region, implying the current rate is an illustrative value that requires further grounding.

Known limitations

The curtailment rate applied for Switzerland PV is an illustrative estimate, as no citable 2023/2024 annual curtailed-energy total was identified and audited for this region.
The current loader derives curtailment from ENTSO-E A75 generation data multiplied by a rate. A future implementation should investigate the availability of ENTSO-E A77 "Curtailed Renewable Energy" data for Switzerland to potentially replace this rate-based estimation with directly measured curtailment.
ENTSO-E sources, including Swissgrid, may exhibit reporting-latency holes, where data publication can lag by 1–3 months, potentially leading to incomplete hourly profiles for certain periods. The backfill process tolerates gaps up to 10% per year for ENTSO-E regions.