Ancillary Services
Puget Sound Energy Inc.’s transmission provider function (PSEI) offers six Ancillary Services in its Open Access Transmission Tariff. These services are only offered in conjunction with transmission service. Due to PSEI’s segmented transmission services, not all Ancillary Services are required or apply. The following table is intended to clarify which Ancillary Services correspond to which transmission services.
|
Scheduling, Control, Dispatch |
Reactive Voltage Support from Generation |
Regulation Frequency Response1 |
Energy Imbalance 1 |
Spinning Reserve 1 |
Supplemental Reserve 1 |
|
|
Washington Facilities |
Must be purchased from PSEI |
Must be purchased from PSEI |
Required when serving loads in PSEI control area |
Required when serving loads in PSEI control area |
Required when serving loads in PSEI control area |
Required when serving loads in PSEI control area |
|
Colstrip Facilities |
Must be purchased from PSEI |
Must be purchased from PSEI |
Not applicable |
Not applicable |
Not applicable |
Not applicable |
|
Southern Intertie Facilities |
Must be purchased from PSEI |
Not applicable |
Not applicable |
Not applicable |
Not applicable |
Not applicable |
1 Must be purchased from PSEI or make alternative comparable arrangements (self or third-party provided)
The following table contains the ancillary service rates listed in Schedules 1 through 6 in PSEI’s Open Access Transmission Tariff, Sixth Revised Volume No. 7.
|
Scheduling, Control, Dispatch |
Reactive Voltage Support from Generation |
Regulation Frequency Response |
Energy Imbalance 2 |
Spinning Reserve |
Supplemental Reserve |
|
|
Annual (per kW-year) |
$0.13 |
$0.07533 |
$66.00 |
MID-C Index |
$80.16 |
$23.52 |
|
Monthly (per kW-month) |
$0.0108 |
$0.00628 |
$5.50 |
MID-C Index |
$6.68 |
$1.90 |
|
Weekly (per kW-week) |
$0.0025 |
$0.00145 |
$1.269 |
MID-C Index |
$1.542 |
$0.452 |
|
Peak Daily (per kW-day) |
0.417 mills |
241 mills |
$0.2115 |
MID-C Index |
$0.2569 |
$0.0754 |
|
Off-peak Daily (per kW-day) |
0.36 mills |
206 mills |
$0.1813 |
MID-C Index |
$0.2202 |
$0.0646 |
|
Peak Hourly (per kW) |
0.026 mills |
15 mils |
13.22 mills |
MID-C Index |
16.06 mills |
4.71 mills |
|
Off-peak Hourly (per kW) |
0.015 mills |
9 mills |
7.55 mills |
MID-C Index |
9.18 mills |
2.69 mills |
2See details of Energy Imbalance service in Schedule 4 and 4R of PSEI's OATT
this page March 26, 2004 revision