Sources: CAISO OASIS (PRC_LMP, DAM)
``` [Full Screen Chart](../download_chart/CAISO/caiso_dart_spread.html) ## Description The DART spread is the financial difference between the day-ahead (DAM) and real-time (RT) markets for the same hour and location. Each series is one of the three CAISO trading hubs (NP15, SP15, ZP26). The day-ahead leg is the hourly DAM LMP; the real-time leg is the hourly mean of the four 15-minute RTPD LMPs in that hour. Positive values mean day-ahead priced above real-time delivery. The PacifiCorp WEIM/EDAM nodes (PACE, PACW) are excluded: they belong to external balancing authorities and are priced separately. **Formulas Used:** $$\text{DART}_t = P^{DAM}_t - \frac{1}{4}\sum_{i=1}^{4} P^{RT15}_{t,i}$$ **Data Cleaning Information:** N/A - hub LMPs are used as published; the hourly averaging of the real-time leg is part of the definition above. ## Notes - Times are UTC; each point is one hour. - Hubs can be toggled on and off via the legend. ## Chart Specs | Chart Name | DART Spread by CAISO Trading Hub | |------------------------|------------------------------------------------------------| | Chart ID | caiso_dart_spread | | Topic Tags | Spreads, Dart, Lmp | | Data Series Start Date | | | Data Frequency | Hourly | | Observation Period | | | Lag in Data Release | | | Data Release Timing | | | Seasonal Adjustment | | | Units | $/MWh | | HTML Chart | [HTML](../download_chart/CAISO/caiso_dart_spread.html) | ## Dataframe Manifest | Dataframe Name | CAISO LMP Day-Ahead Hourly | |--------------------------------|--------------------------------------------------------------------------------------| | Dataframe ID | [caiso_lmp_day_ahead_hourly](../dataframes/CAISO/caiso_lmp_day_ahead_hourly.md) | | Data Sources | CAISO OASIS (PRC_LMP, DAM) | | Data Providers | CAISO | | Links to Providers | http://oasis.caiso.com | | Topic Tags | Lmp, Day-Ahead, Spreads | | Type of Data Access | | | How is data pulled? | src/pulls/pull_caiso_lmp_day_ahead_hourly.py via the open-source gridstatus library | | Data available up to (min) | | | Data available up to (max) | | | Dataframe Path | data\opensource\caiso_lmp_day_ahead_hourly.parquet | **Linked Charts:** - [CAISO:caiso_dart_spread](../../charts/CAISO.caiso_dart_spread.md) ## Pipeline Manifest | Pipeline Name | Project-Lab-Energy-Weather-Natgas-Quanto-CAISO | |---------------------------------|--------------------------------------------------------| | Pipeline ID | [CAISO](../../index.md) | | Lead Pipeline Developer | Brian Nguyen | | Contributors | Brian Nguyen, Claire Kim | | Git Repo URL | | | Pipeline Web Page | Pipeline Web Page | | Date of Last Code Update | 2026-08-27 10:08:05 | | OS Compatibility | Windows, Linux, macOS | | Linked Dataframes | [CAISO:caiso_lmp_day_ahead_hourly](../dataframes/CAISO/caiso_lmp_day_ahead_hourly.md)