6 Ancillary Services
IFM Procurement and Prices
Table 10 shows the monthly IFM average ancillary service procurement and Table 11 shows the monthly average prices.
In September the monthly average procurement increased for regulation down and decreased for regulation up, spinning and non-spinning reserves compared to the previous month. The monthly average prices decreased for all four ancillary services compared to the previous month.
| Month | Aug-2023 | Sep-2023 | Percent Change |
|---|---|---|---|
| Regulation_Up | 569 | 540 | -5.097% |
| Regulation_Down | 1046 | 1051 | 0.478% |
| Spin | 714 | 535 | -25.070% |
| Non-Spin | 1526 | 1448 | -5.111% |
| Ancillary Service | Aug-2023 | Sep-2023 | Percent Change |
|---|---|---|---|
| Non-Spin | $10.64 | $1.62 | -84.73% |
| Regulation_Down | $6.70 | $5.44 | -18.73% |
| Regulation_Up | $14.60 | $3.91 | -73.25% |
| Spin | $11.93 | $1.79 | -85.01% |
Figure 13 shows the daily IFM average ancillary service prices.
The average ancillary service prices were generally stable 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 this month are shown in Table 12 below.
| Date | Hour Ending | Interval | Ancillary Service | Region | Shortfall | Percentage of requirement |
|---|---|---|---|---|---|---|