Arimancy

Data you don't have to clean.

Arimancy is a data products company. We publish public time series datasets, cleaned, joined, and validated before you open the file. Power markets are the flagship family: ERCOT, CAISO, and PJM share one schema, so you can use all three without rewriting anything.

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Power market demand and weather, on one schema

ERCOT, CAISO, and PJM hourly demand joined to population weighted weather, 2015 to 2026, published and free today. The ERCOT table is over 96,000 hourly rows and 29 columns; a LightGBM baseline reaches 4.84% MAPE against an 8.72% seasonal naive, trained through the end of 2024 and tested from January 2025 onward. Two more public time series ship alongside them: the CFTC Commitments of Traders weekly panel and every US domestic flight from 2019 to 2025 joined to observed airport weather.

View all five datasets →

How we build

  1. 01UTC-first joinsEvery join happens in UTC before local time zones are applied, so daylight saving never creates duplicate or missing hours.
  2. 02Verified sourcesEvery input is checked against its original publisher. Source and license are recorded per column.
  3. 03Documented caveatsImputed values, estimates, and known gaps are flagged in the data itself.
  4. 04Permissive licensingCC BY 4.0 on every dataset. Use it commercially or academically; attribution is the only condition.