UCAN's 3rd Set of Data Requests
A. 05-12-014

The following are data requests based on SDG&E's 2004 Grid Assessment Study and Transmission Expansion Plan provided in response to Data Requests 1-29

1. SDG&E states that it would have to drop "approximately 300 Mw of load" for some 230/500 KV transmission line outages (p. 36). Please indicate

a. Which lines (SONGS-Talega or SONGS-San Luis Rey or other) are referred to by the identifiers "TL23002," "TL23006," and "TL23010".
b. The contingency described appears to be a loss of two south-of-SONGS 230 kV lines ("TL23010 and TL 23002" as well as the loss of SWPL ("TL50001"). Please describe the chronological order of events in this contingency (e.g., loss of SWPL, then readjustment of import levels to 2500 Mw, then simultaneous loss of two south-of SONGS lines, then overload of another 230 KV line, then load dropping).
c. If imports are at 2850 Mw under N-0 conditions, and then SWPL goes out of service, could load dropping occur prior to any further contingencies actually occurring, as a preventative measure in anticipation of subsequent transmission line outages?
d. Why is such load dropping consistent with NERC/WECC/CAISO reliability criteria?
e. The level of imports prior to the first and/or second contingencies that would be required in order for load dropping to be required (e.g., over X Mw prior to loss of line TL50001, or over Y Mw prior to the N-2 of lines TL23002 and TL23010).

2. SDG&E states that "under certain operating conditions some minimal dispatch of generation at Encina and South Bay must be maintained" (p. 28). Please state for the year 2005:

a. Under what operating conditions was generation required at Encina and South Bay?
b. How many Mw of Encina and South Bay generation were required to be on line at all times?
c. How many Mw of Encina power plant generation were required to be on line at all times?
d. How many Mw of South Bay power plant generation were required to be on line at all times?
e. What specific Encina and South Bay units were required to be on line at the time of system peak load?
f. How many Mw of Encina and South Bay generation were required to be on line at the time of system peak load?
g. How many Mw of Encina power plant generation were required to be on line at the time of system peak load?
h. How many Mw of South Bay power plant generation were required to be on line at the time of system peak load?
i. What is the minimum generation level for each of the Encina and South Bay units when the unit is operating?

3. For the year 2010, under Case 0 (no action) please provide responses to the following:

a. What specific SDG&E-area units will be required to be on line at all times because of "operating conditions"?
b. How many Mw of SDG&E-area generation will be required to be on line at all times because of "operating conditions"?
c. How many Mw of Encina power plant generation will be required to be on line at all times because of "operating conditions"?
d. How many Mw of South Bay power plant generation will be required to be on line at all times because of "operating conditions"?
e. What specific SDG&E-area units will be required to be on line at the time of system peak load because of "operating conditions"?
f. How many Mw of SDG&E-area generation will be required to be on line at the time of system peak load because of "operating conditions"?
g. How many Mw of Encina power plant generation will be required to be on line at the time of system peak load because of "operating conditions"?
h. How many Mw of South Bay power plant generation will be required to be on line at the time of system peak load because of "operating conditions"?
i. How did SDG&E's GridView modeling in this case incorporate generation requirements caused by "operating conditions"?
j. What "minimal dispatch" of South Bay and/or Encina units was incorporated into the Gridview modeling?
k. How does Gridview incorporate minimum generation levels for committed units?
l. What minimum generation levels (when running) were used in Gridview for each of the steam generation units interconnected to the CAISO-controlled grid?

4. For the year 2010, under Case 1 (Sunrise built) please provide responses to the following:

a. What specific SDG&E-area units will be required to be on line at all times because of "operating conditions"?
b. How many Mw of SDG&E-area generation will be required to be on line at all times because of "operating conditions"?
c. How many Mw of Encina power plant generation will be required to be on line at all times because of "operating conditions"?
d. How many Mw of South Bay power plant generation will be required to be on line at all times because of "operating conditions"?
e. What specific SDG&E-area units will be required to be on line at the time of system peak load because of "operating conditions"?
f. How many Mw of SDG&E-area generation will be required to be on line at the time of system peak load because of "operating conditions"?
g. How many Mw of Encina power plant generation will be required to be on line at the time of system peak load because of "operating conditions"?
h. How many Mw of South Bay power plant generation will be required to be on line at the time of system peak load because of "operating conditions"?
i. If Otay Mesa is offline, what specific SDG&E-area units will be required to be on line at the time of system peak load for voltage support or stability-related reasons?
j. If Otay Mesa is offline, how many Mw of other SDG&E-area generation will be required to be on line at the time of system peak load because of "operating conditions"?
k. If Otay Mesa is offline, how many Mw of Encina power plant generation will be required to be on line at the time of system peak load because of "operating conditions"?
l. If Otay Mesa is offline, how many Mw of South Bay power plant generation will be required to be on line at the time of system peak load because of "operating conditions"?
m. How did SDG&E's GridView modeling in this case incorporate these various local generation requirements?

5. For the year 2010, under Case 2 (new local generation) please provide responses to the following:

a. What specific SDG&E-area units will be required to be on line at all times because of "operating conditions"?
b. How many Mw of SDG&E-area generation will be required to be on line at all times because of "operating conditions"?
c. How many Mw of Encina power plant generation will be required to be on line at all times because of "operating conditions"?
d. How many Mw of South Bay power plant generation will be required to be on line at all times because of "operating conditions"?
e. What specific SDG&E-area units will be required to be on line at the time of system peak load because of "operating conditions"?
f. How many Mw of SDG&E-area generation will be required to be on line at the time of system peak load because of "operating conditions"?
g. How many Mw of Encina power plant generation will be required to be on line at the time of system peak load because of "operating conditions"?
h. How many Mw of South Bay power plant generation will be required to be on line at the time of system peak load because of "operating conditions"?
i. If Otay Mesa is offline, what specific SDG&E-area units will be required to be on line at the time of system peak load for voltage support or stability-related reasons?
j. If Otay Mesa is offline, how many Mw of other SDG&E-area generation will be required to be on line at the time of system peak load because of "operating conditions"?
k. If Otay Mesa is offline, how many Mw of Encina power plant generation will be required to be on line at the time of system peak load because of "operating conditions"?
l. If Otay Mesa is offline, how many Mw of South Bay power plant generation will be required to be on line at the time of system peak load because of "operating conditions"?
m. How did SDG&E's GridView modeling in this case incorporate these various local generation requirements?

6. For the year 2015, under Case 0 (no action) please provide responses to the following:

a. What specific SDG&E-area units will be required to be on line at all times because of "operating conditions"?
b. How many Mw of SDG&E-area generation will be required to be on line at all times because of "operating conditions"?
c. How many Mw of Encina power plant generation will be required to be on line at all times because of "operating conditions"?
d. How many Mw of South Bay power plant generation will be required to be on line at all times because of "operating conditions"?
e. What specific SDG&E-area units will be required to be on line at the time of system peak load because of "operating conditions"?
f. How many Mw of SDG&E-area generation will be required to be on line at the time of system peak load because of "operating conditions"?
g. How many Mw of Encina power plant generation will be required to be on line at the time of system peak load because of "operating conditions"?
h. How many Mw of South Bay power plant generation will be required to be on line at the time of system peak load because of "operating conditions"?
i. How did SDG&E's GridView modeling in this case incorporate generation requirements caused by "operating conditions"?
j. What "minimal dispatch" of South Bay and/or Encina units was incorporated into the Gridview modeling?
k. How does Gridview incorporate minimum generation levels for committed units?
l. What minimum generation levels (when running) were used in Gridview for each of the steam generation units interconnected to the CAISO-controlled grid?

7. For the year 2015, under Case 1 (Sunrise built) please provide responses to the following:

a. What specific SDG&E-area units will be required to be on line at all times because of "operating conditions"?
b. How many Mw of SDG&E-area generation will be required to be on line at all times because of "operating conditions"?
c. How many Mw of Encina power plant generation will be required to be on line at all times because of "operating conditions"?
d. How many Mw of South Bay power plant generation will be required to be on line at all times because of "operating conditions"?
e. What specific SDG&E-area units will be required to be on line at the time of system peak load because of "operating conditions"?
f. How many Mw of SDG&E-area generation will be required to be on line at the time of system peak load because of "operating conditions"?
g. How many Mw of Encina power plant generation will be required to be on line at the time of system peak load because of "operating conditions"?
h. How many Mw of South Bay power plant generation will be required to be on line at the time of system peak load because of "operating conditions"?
i. If Otay Mesa is offline, what specific SDG&E-area units will be required to be on line at the time of system peak load for voltage support or stability-related reasons?
j. If Otay Mesa is offline, how many Mw of other SDG&E-area generation will be required to be on line at the time of system peak load because of "operating conditions"?
k. If Otay Mesa is offline, how many Mw of Encina power plant generation will be required to be on line at the time of system peak load because of "operating conditions"?
l. If Otay Mesa is offline, how many Mw of South Bay power plant generation will be required to be on line at the time of system peak load because of "operating conditions"?
m. How did SDG&E's GridView modeling in this case incorporate these various local generation requirements?

8. For the year 2015, under Case 2 (new local generation) please provide responses to the following:

a. What specific SDG&E-area units will be required to be on line at all times because of "operating conditions"?
b. How many Mw of SDG&E-area generation will be required to be on line at all times because of "operating conditions"?
c. How many Mw of Encina power plant generation will be required to be on line at all times because of "operating conditions"?
d. How many Mw of South Bay power plant generation will be required to be on line at all times because of "operating conditions"?
e. What specific SDG&E-area units will be required to be on line at the time of system peak load because of "operating conditions"?
f. How many Mw of SDG&E-area generation will be required to be on line at the time of system peak load because of "operating conditions"?
g. How many Mw of Encina power plant generation will be required to be on line at the time of system peak load because of "operating conditions"?
h. How many Mw of South Bay power plant generation will be required to be on line at the time of system peak load because of "operating conditions"?
i. If Otay Mesa is offline, what specific SDG&E-area units will be required to be on line at the time of system peak load for voltage support or stability-related reasons?
j. If Otay Mesa is offline, how many Mw of other SDG&E-area generation will be required to be on line at the time of system peak load because of "operating conditions"?
k. If Otay Mesa is offline, how many Mw of Encina power plant generation will be required to be on line at the time of system peak load because of "operating conditions"?
l. If Otay Mesa is offline, how many Mw of South Bay power plant generation will be required to be on line at the time of system peak load because of "operating conditions"?
m. How did SDG&E's GridView modeling in this case incorporate these various local generation requirements?

9. Please provide both a hard copy and an electronic copy of SDG&E's 2005 transmission expansion plan, due to be published on or about March 21, 2006.

10. SDG&E's 2004 transmission expansion plan included study of two cases each in 2006 and 2008 in which import levels were above 2900 Mw (p. 17). Please describe the conditions in each of those years under which imports into the SDG&E area would be allowed to exceed 2850 Mw.