Southwest Power Pool
GENERATION WORKING GROUP MEETING
March 18, 2010
Teleconference Conference
• M I N U T E S •
GWG Chair Mitch Williams called the meeting to order at 9:00 A.M. The following people were in attendance:
GWG Members
Mitch Williams – Western Farmers Electric Coop
Jim Fehr – Nebraska Public Power District
Bryan Tygart – Westar Dispatch
Mike Sheriff – Oklahoma Gas & Electric
Jessica Collins – Xcel Energy
Bill Valagura – Calpine Energy Services
Other Stakeholders and Staff
Greg Froehling – Green Country Generation
Dennis Bradley – Green Country Generation
Robert Dryden – City Utilities
Kevin Goolsby – SPP Staff
Scott Jordan – SPP Staff
There were no proxies by GWG members for this meeting.
A motion to accept the Agenda for this conference call was approved. The motion to accept was by Jim Fehr. The motion to second was by Bryan Tygart.
The minutes from the December 3, 2009 teleconference were approved. The motion to accept was by Jessica Collins. The motion to second was by Jim Fehr.
The minutes from the February 16, 2009 teleconference were approved. The motion to accept was by Jessica Collins. The motion to second was by Jim Fehr.
Scott Jordan reviewed the open Action Items for the February 16, 2009 teleconference meeting.
1. SPP Criteria Changes i. Appendix #2 ii. iii.
Section 12.1.5.2.i
Section 7.8.4.1

iv. Section 12.1 – Change to the verbiage to make the power flow model reference more generic.
2. Reactive Capability Verification Exemption – This item will be discussed in more detail during it’s’ place on the agenda by Jim Fehr and Bryan Tygart.
3. Solar Power Accreditation – This item will be discussed in more detail during it’s’ place on the agenda by Jessica Collins.
Mitch Williams led the discussion concerning the ratification of the following Criteria Changes that were approved by the GWG. These items will be place in the proper format and forwarded to the
MOPC for their approval.
1. SPP Criteria Appendix #2 – Change in formula giving less bias to the Weather Station farthest from the generation site.
Alternative 1
Formula = Σ(T i
/D i
) / Σ(1/D i
)
Station
A
B
C
Distance from unit
(D)
35
50
75
1 / Distance from unit
1/D
0.02857
0.02000
0.01333
Corrected
Temp
(T)
95
100
105
Alt 1 App. 2 Calc 98.8
2. SPP Criteria Section 12.1.5.2.i
– Verbiage clarification.
For those units using a lake or river as a source of condenser cooling water, the summer standard inlet temperature is the highest water inlet temperature during the month concurrent with the Load Serving Member’s peak load of the year, averaged over the past ten years.
3. SPP Criteria 7.8.4.1- Clarification of verbiage concerning under and over voltage load shedding.
Generators shall be able to sustain temporary excursions in under frequency and over frequency, under voltage, and overvoltage conditions. The protective relay systems regarding these conditions shall be coordinated with SPP system under frequency and under voltage load shedding schemes. SPP’s under frequency load shedding plan allows for three stages of load shed at frequencies of 59.3, 59.0, and 58.7 Hz. The members shall shed 10% of their load at each stage in an effort to stop the decline in frequency. Control
Areas may elect to implement a fourth stage at 58.5 Hz which can call for the opening of tie-lines, removal of generating units from buses, additional steps of load shedding, or the breakup of the transmission system into predetermined islands with balanced amounts of generation and load in each island. Due to the structure of the under frequency load shedding plan, it is necessary that generators be able to sustain frequencies to at least 58.5

Hz so that the load shedding plan works as designed. Any generator that must trip off line prior to system frequency declining to 58.5 Hz must have a block of load equal to the generator’s output capability tripped at the same frequency as the generating unit.
In the absence of a regional or control area under voltage load shedding plan, generators shall be able to sustain non-interruptible operation at voltages between 92% and 105% of the nominal transmission voltage at the generator bus. During Emergency and/or transient system conditions, all reasonable measures should be taken to avoid tripping of the generator due to high or low voltage.
4. SPP Criteria 12.1
– Addition of verbiage to cover items concerning equipment rating and the use of the data in power flow modeling.
To provide a basis for comparing operating margin of various entities and to assure reasonable distribution of the margin, generating equipment shall be uniformly and consistently rated to permit accurate planning. Procedures are herein established for rating generating units and establishing a system of records so that changes in capacity during the life of the equipment can be recognized. These procedures define the framework under which the ratings are to be established while recognizing the necessity of exercising judgment in their determination. The terms defined and the ratings established pursuant to these procedures shall be used for SPP purposes, including determining capacity margins for both planning and operating purposes, scheduling maintenance, and preparation of reports of other information for industry organizations, news media, and governmental agencies. These ratings are not intended to restrict daily operating practices associated with SPP operating reserve sharing, for which more dynamic ratings may be necessary. Each member shall test its generating equipment in accordance with the procedures contained herein. On the basis of these tests summer and winter net capability ratings for each generating unit and station on the member's electric system shall be established. This net capability is referenced in many NERC documents as net dependable capacity that is the maximum capacity a unit can sustain over a specified period modified for seasonal limitations and reduced by the capacity required for station service or auxiliaries. The summer net capability of each unit may be used as the winter net capability without further testing, at the option of the member. As a minimum, each member shall conduct tests on all its generating equipment which is designated as a part of the resource for supplying its own peak load and minimum capacity margin requirement of these Criteria. The seasonal net capabilities, gross capabilities, and auxiliary loads shall be furnished to SPP for all existing generating units and upon installation of new generating units and shall be revised at other times when necessary. The generating capability limits will be equal to or less than the most limiting component including but not limited to bus, breakers, switches, transformers, or generating protection relays. Members shall annually report the seasonal net generating unit capability in conjunction with the Department of Energy 411 Report data gathering effort and insure that the generator limits are used in determining the data contained in
SPP power flow models. During the capability test the net capability shall be reported.
Additionally, the unit’s gross capability and auxiliary load shall be reported. The gross capability and auxiliary load shall be determined from the test or using such methods as use of manufacturer data, commissioning data, performance tracking, etc. Data used to determine net capability shall be obtained from testing.

Jim Fehr led the discussion on the Reactive Capability Verification Exemption section that is being proposed to be added to SPP Criteria Section 12.1.6. Jim and Bryan Tygart researched this topic and then vetted their verbiage with their companies and SPP. Concern was voiced over the term aggregate capability used in section 12.1.6.1.2.a. Jim explained that even if a small generator met this piece of the Criteria, then it could still seek an exemption using section
12.1.6.1.2.b. Clarification on additional verbiage in section 1 2.1.6.1.2.a concerning the limit of “50
MWs” was raised. The group decided that the proper unit that should be used instead of “MWs” should be “Generator Nameplate MVA”. The impact of renewable resources on this exemption was discussed. It was decided to vet the change above and the impact of the renewable resources with the respective GWG Member Companies. This item should be ready to be voted on by the next GWG Conference Call.
Jessica Collins reported that she had vetted her ideas with inside her company, but did not have anything formal to share with the group. She is working towards having something to present at the next Conference Call.
Jim Fehr brought an item to the attention of the GWG concerning the lack of an exemption for reactive power capability testing in the SPP Criteria, Section 12. He stated that after some research that MRO, RCF, and SERC did allow exemptions from testing reactive capability based on the size of the generation unit. After some discussion, it was felt that this was an item that needed to be considered to be included in Section 12.1.6 of the SPP Criteria. Jim Fehr agreed to author a section or add verbiage to an existing section to cover this topic. Bryan Taggart agreed to assist Jim with this task.
Jessica Collins brought an item to the attention of the GWG that the current SPP Criteria did not address Solar Energy. It was discussed by the group that this renewable resource could become the new boom that Wind is right now in our industry. The group felt that the Criteria needed to address this energy resource. Jessica Collins agreed to author an addition to the SPP Criteria similar to section 12.1.5.3.g. to cover solar generation accreditation. Mike Sheriff agreed to assist
Jessica with this task.

Scott Jordan summarized the actions items of the teleconference meeting:
1. Scott Jordan will transfer the SPP Criteria Changes into the proper format and forward them to the MOPC for their approval.
2. Jim Fehr will continue to refine the additional verbiage to an existing SPP Criteria Section
12.1.6 to cover the topic of exemption for Reactive Capability Verification. Bryan Taggart will continue to assist Jim with this task.
3. Jessica Collins will continue to refine an addition to the SPP Criteria similar to section
12.1.5.3.g. to cover solar generation accreditation. Mike Sheriff agreed to assist Jessica with this task.
The next GWG Teleconference will be held on Thursday, April 30, 2010 from 9:00 – 10:30 A.M.
The meeting was adjourned at 10:?? A.M.
Respectfully Submitted,
Scott Jordan
GWG Secretary