Section 3 Market Performance Metrics
Day-Ahead Prices
Figure 3.1 show the daily simple average load-aggregation points (LAP) prices for each of the four default LAPs (PG&E, SCE, SDG&E, and VEA) for all hours. TABLE 3.1 below lists the binding constraints along with the associated DLAP locations and the dates when the binding constraints resulted in relatively high or low DLAP prices. October 16 saw elevated prices for all four DLAPs due to tight supply.
Figure 3.1: Day-Ahead Simple Average LAP Prices (All Hours)
| DLAP | Dates | Transmission Constraint |
|---|---|---|
| SDGE | October 13 | OMS-8701990_50001_OOS_NG,SUNCREST-SUNCREST-230 XFMR |
| SDGE | October 14 | OMS-8701990_50001_OOS_NG,SUNCREST-SUNCREST-230 XFMR |
| SDGE | October 15 | OMS-8701990_50001_OOS_NG,SUNCREST-SUNCREST-230 XFMR |
Real-Time Price
Figure 3.2 show daily simple average LAP prices for all the default LAPs (PG&E, SCE, SDG&E, and VEA) for all hours respectively in FMM. TABLE 3.2 lists the binding constraints along with the associated DLAP locations and the dates when the binding constraints resulted in relatively high or low DLAP prices. All four DLAP prices were elevated on October 15 due to upward load adjustment, generation outages, and renewable deviation.
Figure 3.2: FMM Simple Average LAP Prices (All Hours)
| DLAP | Dates | Transmission Constraint |
|---|---|---|
| SDGE | October 1 | MIGUEL-MIGUELMP-500 XFMR |
| SDGE | October 5 | SUNCREST-SUNCREST-230 XFMR |
| PGAE | October 12-14 | MIDWAY-VINCENT-500kV line |
Figure 3.3 below shows the daily frequency of positive price spikes and negative prices by price range for the default LAPs in the FMM. The cumulative frequency of prices above $250/MWh decreased to 1.26 percent in October from 1.66 percent in August. The cumulative frequency of negative prices fell to 0.08 percent in October from 0.24 percent in September.
Figure 3.3: Daily Frequency of FMM LAP Positive Price Spikes and Negative Prices
Figure 3.4 show daily simple average LAP prices for all the default LAPs (PG&E, SCE, SDG&E, and VEA) for all hours respectively in RTD. TABLE 3.3 lists the binding constraints along with the associated DLAP locations and the dates when the binding constraints resulted in relatively high or low DLAP prices.
Figure 3.4: FMM Simple Average LAP Prices (All Hours)
| DLAP | Dates | Transmission Constraint |
|---|---|---|
| SDGE | October 22 | MIDWAY-VINCENT-500 kV line |
Figure 3.3 below shows the daily frequency of positive price spikes and negative prices by price range for the default LAPs in RTD. The cumulative frequency of prices above $250/MWh slipped to 0.45 percent in October from 1.24 percent in September. The cumulative frequency of negative prices decreased to 0.26 percent in October from 0.58 percent in September.
Figure 3.5: Daily Frequency of FMM LAP Positive Price Spikes and Negative Prices
