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 February the March IFM average procurement increased for for all four types of ancillary services compared to the previous month. The monthly IFM average prices increased for Regulation up, Regulation down, and non-spining reserve compared to previous month.

Table 6.1: IFM Monthly Average Ancillary Service Procurement
Month Feb-2025 Mar-2025 Percent Change
Regulation_Up 480 512 6.7%
Regulation_Down 1003 1055 5.2%
Spin 488 531 8.8%
Non-Spin 959 965 0.6%
Table 6.2: IFM Monthly Average Ancillary Service Price
Ancillary Service Feb-2025 Mar-2025 Percent Change
Non-Spin $0.75 $1.01 34.5%
Regulation_Down $11.60 $12.62 8.8%
Regulation_Up $4.91 $5.01 2.0%
Spin $1.25 $1.12 -10.1%

Figure 6.1 shows the daily IFM average ancillary service prices.

The average day-ahead ancillary service prices for regulation down increased on March 27 and regulation up increased on multiple days during this month.

Figure 6.1: IFM (Day-Ahead) Ancillary Service Average Price

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. There is no scarcity events in this month as shown in Table 6.3 below.

Table 6.3: Ancillary Service Scarcity Events
Date Hour Ending Interval Ancillary Service Region Shortfall Percentage of requirement