6 Ancillary Services
IFM Procurement and Prices
Table 9 shows the monthly IFM average ancillary service procurement and Table 10 the monthly average prices. In July the monthly average procurement increased for all four types of ancillary services. The monthly average prices increased for regulation up, spin and non-spin reserve this month.
| Month | Jun-2021 | Jul-2021 | Percent Change |
|---|---|---|---|
| Regulation_Up | 380 | 390 | 2.63% |
| Regulation_Down | 680 | 814 | 19.71% |
| Spin | 980 | 1030 | 5.10% |
| Non-Spin | 963 | 982 | 1.97% |
| Month | Jun-2021 | Jul-2021 | Percent Change |
|---|---|---|---|
| Non-Spin | $4.64 | $7.35 | 58.6% |
| Regulation_Down | $11.41 | $7.86 | -31.1% |
| Regulation_Up | $8.52 | $12.28 | 44.2% |
| Spin | $6.00 | $9.09 | 51.5% |
Figure 13 shows the daily IFM average ancillary service prices. The average prices for regulation up, spin and non-spin reserves were elevated on July 12 an 29 due to high opportunity cost of energy.
Figure 13: 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 June are shown in the Table 11 below.
| Date | Hour Ending | Interval | Ancillary Service | Region | Shortfall | Percentage of requirement |
|---|---|---|---|---|---|---|
| Jul-09 | 19 | 4 | Regulation Up | NP26_EXP | 19.7 | 14.10% |
| Jul-09 | 20 | 1, 2 | Regulation Up | NP26_EXP | 22.3 | 17.70% |
| Jul-09 | 20 | 3 | Non-Spin | CAISO_EXP | 380.7 | 32.30% |
| Jul-09 | 20 | 4 | Non-Spin | CAISO_EXP | 573.1 | 48.70% |
| Jul-09 | 21 | 1 | Non-Spin | CAISO_EXP | 463.6 | 39.50% |
| Jul-09 | 21 | 2 | Non-Spin | CAISO_EXP | 448.8 | 38.50% |
| Jul-09 | 21 | 3 | Non-Spin | CAISO_EXP | 264.7 | 22.70% |
| Jul-09 | 21 | 4 | Non-Spin | CAISO_EXP | 229.6 | 19.80% |
| Jul-09 | 22 | 1 | Non-Spin | CAISO_EXP | 232.8 | 20.30% |
| Jul-13 | 9 | 1, 2 | Regulation Down | NP26_EXP | 0.5 | 0.14% |