Section 6 Ancillary Services
IFM Procurement and Prices
Table 6.1 hows the monthly IFM average ancillary service procurements and Table 6.2 the monthly average prices. In December the monthly average procurement increased for regulation down, spinning and non-spinning reserves. The monthly average prices decreased for spinning and non-spinning reserves this month.
| Month | Dec-2020 | Nov-2020 | Percent Change |
|---|---|---|---|
| Regulation_Up | 421 | 435 | -3.2% |
| Regulation_Down | 652 | 584 | 11.6% |
| Spin | 937 | 844 | 11.0% |
| Non-Spin | 937 | 843 | 11.2% |
| Month | Dec-2020 | Nov-2020 | Percent Change |
|---|---|---|---|
| Non-Spin | $0.10 | $0.36 | -70.6% |
| Regulation_Down | $13.16 | $12.98 | 1.3% |
| Regulation_Up | $9.55 | $9.53 | 0.2% |
| Spin | $3.89 | $4.92 | -20.9% |
Figure 6.1 shows the daily IFM average ancillary service prices. On December 25 and 26, the average prices for regulation down were elevated due to high opportunity cost of energy.
Figure 6.1: IFM (Day-Ahead) Ancillary Service Average Price
Scarcity Events
The ancillary services scarcity pricing mechanism is triggered when the ISO is not able to procure the target quantity of one or more ancillary services in the IFM and real-time market runs. The scarcity events in December are shown in the Table 6.3 below, which are all in the real-time market.
| Date | Hour Ending | Interval | Ancillary Service | Region | Shortfall | Percentage of requirement |
|---|---|---|---|---|---|---|
| Dec-02 | 15 | 1 | Regulation Down | SP26_EXP | 0.64 | 0.21% |
| Dec-03 | 16 | 3 | Regulation Down | SP26_EXP | 0.88 | 0.34% |
| Dec-04 | 13 | 2 | Regulation Up | SP26_EXP | 1.83 | 1.19% |
| Dec-04 | 13 | 3 | Regulation Up | SP26_EXP | 3.27 | 2.12% |
| Dec-05 | 11 | 1,2,3,4 | Regulation Up | SP26_EXP | 0.85 | 0.50% |
| Dec-05 | 12 | 1,2,3,4 | Regulation Up | SP26_EXP | 0.86 | 0.51% |
| Dec-05 | 13 | 1 | Regulation Up | SP26_EXP | 0.38 | 0.25% |
| Dec-05 | 13 | 2 | Regulation Up | SP26_EXP | 0.43 | 0.28% |
| Dec-08 | 5 | 1 | Regulation Up | NP26_EXP | 0.11 | 0.10% |
| Dec-13 | 11 | 1 | Regulation Down | CAISO_EXP | 7.53 | 0.79% |
| Dec-20 | 6 | 1 | Regulation Down | SP26_EXP | 0.43 | 0.36% |
| Dec-20 | 8 | 4 | Regulation Down | SP26_EXP | 0.66 | 0.21% |
| Dec-20 | 14 | 4 | Regulation Down | CAISO_EXP | 6.98 | 1.00% |
| Dec-20 | 16 | 4 | Regulation Up | SP26_EXP | 4.41 | 1.88% |
| Dec-23 | 24 | 1 | Regulation Down | SP26_EXP | 2.03 | 1.14% |
| Dec-28 | 12 | 4 | Regulation Down | SP26_EXP | 1.34 | 0.45% |