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 June the monthly average procurement decreased for regulation down and non-spinning reserves, but increased for regulation up and spinning reserves compared to the previous month. The monthly average prices for all ancillary services increased in June from the previous month.
| Month | May-2023 | Jun-2023 | Percent Change |
|---|---|---|---|
| Regulation_Up | 514 | 528 | 2.7% |
| Regulation_Down | 992 | 885 | -10.8% |
| Spin | 522 | 563 | 7.9% |
| Non-Spin | 1722 | 1396 | -18.9% |
| Month | May-2023 | Jun-2023 | Percent Change |
|---|---|---|---|
| Non-Spin | $1.61 | $2.88 | 79% |
| Regulation_Down | $7.98 | $8.34 | 4% |
| Regulation_Up | $6.58 | $15.93 | 142% |
| Spin | $3.35 | $8.61 | 157% |
Figure 13 shows the daily IFM average ancillary service prices.
The average prices were generally stable this month, except for regulation up which experienced volatility.
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 |
|---|---|---|---|---|---|---|