SimPT-Power: a public-data multi-voltage (0.4-400 kV) power-system simulation database of mainland Portugal (release 2026.09.30-r3)

SimPT-Power is a multi-voltage (0.4-400 kV) power-system simulation database of mainland Portugal built from public data (E-REDES open data, REN, DGEG, ERSE, INE, OpenStreetMap). It contains: the 60-400 kV core CORE-3787-REN (3,787 buses, 4,926 lines, 219 transformers, reconciled with the REN RNT characterisation of 31-12-2025) with 31,492 solved 15-minute AC power-flow snapshots (May 2025 - March 2026); 617 MV root slices with inferred urban cable networks and an MV customer estimate; 72,434 secondary substations with four-wire LV feeders and the geographic LV network LV-GEO-A (5.7 million segments); and the public observation tables used for validation. SimPT-Power is a simulation database, not the operator's network or a digital twin: converged power flows show numerical consistency, not agreement with operator state estimates. Public, inferred and simulated values are labelled separately. Files: simpt_power.duckdb.zst (multi-voltage DuckDB database, folder database/); CORE-3787-REN_model.json, MONTHLY_MANIFEST.json and 11 monthly databases of solved snapshots pt60_models_YYYY-MM.compact.duckdb.zst (folder hv_core/); validation.zip, observations.zip, figures.zip (release sub-folders); README.md, release.json, SHA256SUMS, file_manifest.csv, requirements-lock.txt, SOURCE_LICENSES.md, DATA_LICENSE.md (folder documentation/); open_bundle_r3.zip (uncompressed Parquet and pandapower JSON subset for notebooks). Put the files back into the folders given in file_manifest.csv, unzip, and verify with shasum -a 256 -c SHA256SUMS. Build and analysis code is published separately (see the data paper). Licences: the record is released under ODbL 1.0 because it contains OpenStreetMap-derived data (c) OpenStreetMap contributors; E-REDES open data are CC BY 4.0; REN, ERSE, INE, DGEG and GISCO data keep their own terms (see SOURCE_LICENSES.md).