# Data Dictionary - US Electricity Grid Balance by Region - Demand, Forecast, Net Generation & Interchange (EIA, cleaned Parquet)

**Units:** vary by `series` - read the per-row `unit` column (overall: MWh).  Times are UTC.

| column | type | description |
|---|---|---|
| `zone` | str | EIA region |
| `ts` | timestamp (UTC) | Hour |
| `series` | str | Demand / Day-ahead forecast / Net generation / Total interchange |
| `mwh` | float | MWh (interchange is signed) |
| `unit` | str | Unit |
| `res_min` | int | Native resolution (hourly) |

*Source: U.S. Energy Information Administration (EIA).*