Advice Filing - Pacific Power

1 PacifiCorp's peak hourly load demand in the current or preceding 11 months.
2 Therefore, if the QF generation reduced peak imports, PacifiCorp might realize a
3 reduction in transmission service charges into the load pocket.
4 14. In practice, the amount of savings realized has been minimal.
5 compared actual hourly generation data from Threemile in 2009 and 2010 to actual
6 load data at Dalreed during the same period. By subtracting Threemile Canyon
7 generation from Dalreed load, I calculated what imports to Dalreed would have been
8 without the Threemile project. I then compared actual 2009 and 2010 hourly
9 Dalreed demand with the calculated amounts to determine how much the Threemile
10 project actually reduced peak demand.
11 15. In 2009, there was no reduction in peak hourly demand and therefore
12 no savings under the BPA GTA. Dalreed experienced its annual peak hour in June
13 2009, before Threemile was commercial, and under the ratchet billing formulae, the
14 June 2009 peak was the governing billing determinant for the next 11 months.
15 16. In 2010, Threemile reduced the annual peak hour demand at Dalreed
16 by approximately 334 kW. A peak hourly demand of 43,742 kW occurred at 6PM
17 (HE 19:00) on August 1, 2010. Without Threemile's contribution to Dalreed, the
18 annual peak hour demand would have been 44,076 kW, or 334 kW greater, at lOAM
19 (HE 11:00) on August 18, 2010. Because the August 1 peak hourly demand has
20 remained the billing determinant through May 2011, one could credit Threemile
21 with lowering the ratchet demand by 334 kW for 10 months-a savings of $900.13.
22 17. Compared to the $101,808 annual cost PacifiCorp has incurred for
23 short-term firm transmission out of Dalreed, or the $144,096 annual cost PacifiCorp
Affidavit of Bruce Griswold 7
in Support of PacifiCorp's Advice No. 11-011