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 May the monthly average procurement decreased for regulation up and regulation down. The monthly average prices increased for regulation down, spin and non-spin reserve this month.
| Month | Apr-2021 | May-2021 | Percent Change |
|---|---|---|---|
| Regulation_Up | 425 | 381 | -10.35% |
| Regulation_Down | 650 | 643 | -1.08% |
| Spin | 770 | 857 | 11.30% |
| Non-Spin | 770 | 860 | 11.69% |
| Month | Apr-2021 | May-2021 | Percent Change |
|---|---|---|---|
| Non-Spin | $0.16 | $0.32 | 107% |
| Regulation_Down | $12.51 | $13.23 | 6% |
| Regulation_Up | $4.90 | $4.31 | -12% |
| Spin | $1.35 | $2.02 | 49% |
Figure 13 shows the daily IFM average ancillary service prices. The average prices were generally quiet this month.
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 May are shown in the Table 11 below. There were no scarcity events this month.
| Date | Hour Ending | Interval | Ancillary Service | Region | Shortfall | Percentage of requirement |
|---|---|---|---|---|---|---|