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 April the monthly average procurement decreased for regulation up and spinning reserves, but rose for regulation down and non-spinning reserves from the previous month. The monthly average prices for spinning reserves, non-spinning reserves and regulation up decreased while regulation down increased in April from the previous month.
| Month | Mar-2023 | Apr-2023 | Percent Change |
|---|---|---|---|
| Regulation_Up | 591 | 554 | -6.3% |
| Regulation_Down | 1033 | 1061 | 2.7% |
| Spin | 581 | 496 | -14.6% |
| Non-Spin | 1309 | 1458 | 11.4% |
| Month | Mar-2023 | Apr-2023 | Percent Change |
|---|---|---|---|
| Non-Spin | $10.57 | $7.83 | -26.0% |
| Regulation_Down | $10.41 | $11.36 | 9.1% |
| Regulation_Up | $16.74 | $14.34 | -14.3% |
| Spin | $9.54 | $6.49 | -32.0% |
Figure 13 shows the daily IFM average ancillary service prices.
The average 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 |
|---|---|---|---|---|---|---|