# ERCOT historical price screen: GUNMTN_NODE

2025-10-01 through 2025-11-30. 1,465 verified hourly intervals per settlement point (1,465 total). Day-ahead market settlement point prices in $/MWh.

## Summary

| Metric | GUNMTN_NODE |
|---|---:|
| Mean | 58.38 |
| Median | 47.34 |
| 95th percentile | 135.56 |
| Minimum | -9.89 |
| Maximum | 213.31 |
| Negative hours | 20 |
| Hours above $100 | 244 |
| Peak mean (HE7-22, Mon-Fri) | 52.74 |
| Off-peak mean | 63.38 |
| Peak premium | -10.64 |
| TB2 daily spread, average | 100.82 |
| TB4 daily spread, average | 92.00 |

## Monthly: GUNMTN_NODE

| Month | Hours | Mean | P95 | Negative hours | Hours above $100 | TB2 | TB4 |
|---|---:|---:|---:|---:|---:|---:|---:|
| 2025-10 | 744 | 66.88 | 149.18 | 2 | 171 | 114.97 | 105.96 |
| 2025-11 | 721 | 49.62 | 116.46 | 18 | 73 | 86.21 | 77.58 |

## Method

- Peak: hour-ending 7-22 Monday-Friday (holidays treated as weekdays); off-peak is every other hour.
- TB2: per delivery day, mean of the 2 highest hourly prices minus mean of the 2 lowest; averaged with equal weight per day. TB4: per delivery day, mean of the 4 highest hourly prices minus mean of the 4 lowest; averaged with equal weight per day. Daylight-saving days use their 23 or 25 delivered hours.
- P95: 95th percentile with linear interpolation. Spike threshold: $100/MWh.
- Coverage: every local hour of every delivered day was verified once per settlement point before delivery; the fall repeated hour is kept as two rows distinguished by DSTFlag and the spring short day has 23 rows. hourly.csv holds every verified row; SHA-256 of the canonical rows: 093580d69d9c75f88baa531d214b303ea679d1f934e6805223da36b8a53fa303.

Source: ERCOT NP4-190-CD, as retrieved. Prices may be corrected. This is historical screening, not a forecast, engineering study or battery revenue estimate.