Section 6 Ancillary Services
IFM Procurement and Prices
Table 6.1 shows the monthly IFM average ancillary service procurement and Table 6.2 shows the monthly IFM average ancillary service prices.
In April the monthly IFM average procurement increased for for all four types of ancillary services compared to the previous month. The monthly IFM average prices decreased for for all four types of ancillary services compared to previous month.
| Month | Mar-2025 | Apr-2025 | Percent Change |
|---|---|---|---|
| Regulation_Up | 512 | 559 | 9.2% |
| Regulation_Down | 1055 | 1072 | 1.6% |
| Spin | 531 | 559 | 5.3% |
| Non-Spin | 965 | 1101 | 14.1% |
| Ancillary Service | Mar-2025 | Apr-2025 | Percent Change |
|---|---|---|---|
| Non-Spin | $1.01 | $0.79 | -21.8% |
| Regulation_Down | $12.62 | $7.93 | -37.2% |
| Regulation_Up | $5.01 | $4.46 | -11.0% |
| Spin | $1.12 | $1.02 | -8.6% |
Figure 6.1 shows the daily IFM average ancillary service prices.
The average day-ahead ancillary service prices decreased for all four types of ancillary services during this month.
Figure 6.1: IFM (Day-Ahead) Ancillary Service Average Price
Daily average ancillary procurement and prices in the real-time market (FMM) are shown in the Appendix.
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 as shown in Table 6.3 below.
| Date | Hour Ending | Interval | Ancillary Service | Region | Shortfall | Percentage of requirement |
|---|---|---|---|---|---|---|
| Apr-11 | 10 | 4 | Regulation Down | NP26_EXP | 6.96 | 1% |