# Data Dictionary - UK Power Stress & Imbalance Panel - half-hourly, derived Parquet

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

| column | type | description |
|---|---|---|
| `zone` | str | Always GB |
| `ts` | timestamp (UTC) | Settlement period |
| `variable` | str | Metric |
| `value` | float | Value |
| `unit` | str | Unit (mixed) |
| `res_min` | int | Native resolution (30) |

*Source: Contains BMRS data © Elexon Limited.*