ER27-432-000 · 2026-11-06 · Southwest Power Pool, Inc.

SPP proposes conditional large-load service revenue credits for its western zones

November 6, 2026 
 
The Honorable Debbie-Anne A. Reese 
Secretary 
Federal Energy Regulatory Commission 
888 First Street, N.E. 
Washington, D.C.  20426 
 
Re: 
Southwest Power Pool, Inc., Docket No. ER27-____-000 
Submission of Tariff Revisions to Revise Schedule 15 and Attachment 
T for the SPP West Region 
 
Dear Secretary Reese:  
 
 
Pursuant to Section 205 of the Federal Power Act (“FPA”), 16 U.S.C. § 824d, 
and Section 35.13 of the Federal Energy Regulatory Commission’s (“Commission”) 
Regulations, 18 C.F.R. § 35.13, Southwest Power Pool, Inc. ("SPP") submits revisions 
to Schedule 15 and Attachment T of its Open Access Transmission Tariff (“Tariff”)1 
to add provisions for Conditional High Impact Large Load Service (“CHILLS”) for 
pricing Zones in the SPP West Region, and to make other clarifying edits. 
 
SPP respectfully requests that the Commission accept the proposed revisions, 
find the revisions just and reasonable, and set an effective date of February 1, 2027.  
 
I. 
BACKGROUND 
A. 
SPP’s Regional Transmission Organization Expansion 
 
On April 1, 2026, SPP expanded its Regional Transmission Organization 
(“RTO”) into the Western Interconnection.2 Specifically, the following utilities now 
 
1  
Southwest Power Pool, Inc., Open Access Transmission Tariff, Sixth Revised 
Volume No. 1.  References in this filing to "Tariff" refer to the version of SPP’s 
Tariff currently in effect. "Proposed Tariff" refers to a version reflecting the 
revisions proposed in this filing. All capitalized terms not otherwise defined in 
this filing shall have the definitions assigned by the Tariff. 
2  
The revisions to effectuate the expansion were filed in Docket Nos. ER24-2184 
and ER24-2185. Southwest Power Pool, Inc., Submission of Revisions to 
Tariff, Bylaws, and Membership Agreement to Expand the Regional 
Transmission Organization into the Western Interconnection (Part 1 of 2), 
Docket No. ER24-2184-000 and (Part 2 of 2), Docket No. ER24-2185-000 
(June 4, 2024). All citations to the “SPP Expansion Filing” are to the Part 1 
filing in Docket No. ER24-2184-000.The Commission accepted the revisions 
to SPP’s governing documents in a series of orders. Sw. Power Pool, Inc., 190

The Honorable Debbie-Anne A. Reese 
November 6, 2026 
Page 2 
 
include their transmission facilities in the Western Interconnection under SPP’s Tariff: 
Basin Electric Power Cooperative (“Basin Electric”); Colorado Springs Utilities 
(“CSU”); Deseret Generation and Transmission Cooperative; Platte River Power 
Authority (“Platte River”); Tri-State Generation and Transmission Association, Inc. 
(“Tri-State”); Western Area Power Administration – Colorado River Storage Project 
Management Center (“WAPA-CRSP”); Western Area Power Administration – Rocky 
Mountain Region (“WAPA-RMR”); and Western Area Power Administration – Upper 
Great Plains Region (“WAPA-UGP”) (collectively, the “Expansion Members”). Basin 
Electric, Tri-State, and WAPA-UGP were already Members of the SPP RTO and, with 
the expansion of the SPP RTO, expanded their SPP RTO participation with the 
inclusion of additional transmission facilities in the Western Interconnection.  
 
SPP established five new transmission pricing Zones in Attachment H of the 
Tariff in order to effectuate the integration of the new transmission facilities: 100, 101, 
102, 103, and 104.3 SPP also added the “Incremental Market Efficiency Use” 
provisions in the Tariff.4 In addition, SPP included a new Schedule 14 for the DC Tie 
Access Charge.5 
 
B.  
Revisions to Add CHILLS 
 
On February 10, 2026, SPP submitted revisions to the Tariff to add CHILLS to 
allow High Impact Large Loads (“HILL”) to be served with non-firm conditional 
transmission service.6 The Commission accepted the provisions in a series of orders.7 
 
C. 
Purpose of Filing 
 
At the time of the CHILLS Filing, the new pricing Zones for the SPP West 
Region had not yet been established in the Tariff. SPP submits this filing to include the 
pricing Zones in Schedule 15 of the Tariff, and to also add CHILLS provisions to 
 
FERC ¶ 61,169 (2025); Sw. Power Pool, Inc., Letter Order, Docket No. ER24-
2184-002 (July 11, 2025). 
3  
SPP Expansion Filing at 91. 
4  
SPP Expansion Filing at 52-53. 
5  
SPP Expansion Filing at 48. 
6  
Submission of Tariff Revisions to Add Conditional High Impact Large Load 
Service of Southwest Power Pool, Inc., Docket No. ER26-1323-000 (Feb. 10, 
2026) (“CHILLS Filing”). 
7  
Sw. Power Pool, Inc., 195 FERC ¶ 61,196 (2026); Sw. Power Pool, Inc., Letter 
Order, Docket No. ER26-1323-002 (Oct. 26, 2026).

The Honorable Debbie-Anne A. Reese 
November 6, 2026 
Page 3 
 
certain Rate Sheets for Point-To-Point Transmission Service under Attachment T of 
the Tariff. SPP also proposes other clarifying edits to Attachment T. 
 
II. 
DESCRIPTION OF AND JUSTIFICATION FOR PROPOSED TARIFF 
REVISIONS  
 
A. 
Schedule 15 
 
In the CHILLS Filing, SPP proposed a new Schedule 15, to establish charges 
for CHILLS.8 SPP proposes to add pricing Zones 100, 101, 102, 103, and 104 under 
Section 1 of Schedule 15: 
 
 
Zone 100: 
Colorado Springs Utilities 
 
Zone 101:  
Platte River Power Authority 
 
Zone 102: 
Tri-State G&T Association – West 
 
Zone 103: 
Colorado River Storage Project Zone 
 
Zone 104: 
Loveland Area Projects Zone 
 
These revisions are just and reasonable because they effectuate the intent of the 
CHILLS Filing already accepted by the Commission and will allow those entities in 
the SPP West Region that take CHILLS to also pay for the use of the transmission 
facilities located in those newly formed Zones in the SPP West Region. 
 
B. 
Attachment T 
 
 
Attachment T includes the rate sheets for Point-To-Point Transmission Service 
for all applicable Transmission Owners under the Tariff. SPP proposes to revise the 
following rate sheets. 
 
1. 
Rate Sheets for CSU, Platte River, and WAPA-CRSP 
 
 
SPP proposes the following revisions to the rate sheets for CSU, Platte River, 
and WAPA-CRSP: 
 
Point-To-Point Transmission Service and Conditional High Impact 
Large Load Service Revenue Crediting for Point-To-Point Rates 
Rates for Point-To-Point Transmission Service under this Attachment T 
shall reflect any adjustments for Schedule 7 and 8 revenues, and 
Schedule 15 revenues, and revenues distributed and allocated under 
Attachment AU, implemented in accordance with Section 34.1(2) of 
this Tariff.  The rates, including any applicable adjustments for 
Schedule 7 and 8 revenues, and Schedule 15 revenues, and revenues 
 
8  
CHILLS Filing at 29-30.

The Honorable Debbie-Anne A. Reese 
November 6, 2026 
Page 4 
 
distributed and allocated under Attachment AU, shall be set forth in the 
RRR File.9 
 
First, SPP adds a reference to Schedule 15 to appropriately adjust the Point-To-
Point Transmission Service Rates for any revenues received for Schedule 15 charges. 
These proposed changes to add a reference to Schedule 15 revenues are just and 
reasonable because they will appropriately adjust the Point-To-Point Transmission 
Service Rates for any revenues received for Schedule 15 charges. The changes are 
consistent with the revisions to other rate sheets accepted by the Commission in the 
CHILLS Filing. 
 
 
Second, SPP removes the references to Attachment AU revenues. Due to an 
administrative error, SPP mistakenly included references to Attachment AU revenues 
in the rate sheets for CSU and Platte River in the SPP West Region. As explained in 
the SPP Expansion Filing, Attachment AU revenues are allocated only to Transmission 
Owners in the SPP East Region.10 
 
2. 
Rate Sheets for Loveland Area Projects, SPP West Region 
Average, and Tri-State G&T Association-West 
 
 
SPP proposes the following revisions to the rate sheets for Loveland Area 
Projects, SPP West Region Average, and Tri-State G&T Association-West: 
 
Point-To-Point Transmission Service Revenue Crediting for Point-
To-Point Rates 
Rates for Point-To-Point Transmission Service under this Attachment T 
shall reflect any adjustments for Schedules 7, and 8, 14, and 15 
revenues, and Incremental Market Efficiency Use revenues, and 
revenues distributed and allocated under Attachment AU, implemented 
in accordance with Section 34.1(2) of this Tariff.  The rates, including 
any applicable adjustments for Schedules 7, and 8, 14, and 15 revenues, 
and Incremental Market Efficiency Use revenues, and revenues 
distributed and allocated under Attachment AU, shall be set forth in the 
RRR File. 
 
 
9  
SPP also includes a ministerial edit to the rate sheet for CSU to correctly reflect 
CSU’s Addendum number under Attachment H of the Tariff. 
 
10  
SPP Expansion Filing at 56. See also Tariff, Attachment AU, Section I (“Such 
revenues…shall be allocated to Transmission Owners in the SPP East Region 
based on the estimated flow impacts resulting from energy transfers between 
MISO north and south subregions, as described in this Attachment AU.”).

The Honorable Debbie-Anne A. Reese 
November 6, 2026 
Page 5 
 
First, SPP adds a reference to Schedule 14 for the DC Tie Access Charge. The 
DC Tie Access Charge is defined as “[a] charge on a transmission reservation utilizing 
a West DC Tie that sinks outside of the Zone where the West DC Tie is located.”11 The 
Transmission Customer is responsible for the DC Tie Access Charge determined in 
Schedule 14 of the Tariff. SPP adds this reference to the rate sheets where the DC Tie 
Access Charge is applicable. 
 
Second, SPP adds a reference to Schedule 15 to appropriately adjust the Point-
To-Point Transmission Service Rates for any revenues received for Schedule 15 
charges. The proposed changes to add a reference to Schedule 15 revenues are just and 
reasonable because they will appropriately adjust the Point-To-Point Transmission 
Service Rates for any revenues received for Schedule 15 charges. The changes are 
consistent with the revisions to other rate sheets accepted by the Commission in the 
CHILLS Filing. 
 
Third, SPP adds a reference to Incremental Market Efficiency Use revenues. 
The Incremental Market Efficiency Use Charge is “[a] market recovery mechanism to 
compensate West DC Tie Transmission Owners for the expected loss of life of certain 
West DC Tie facilities due to increased utilization of the West DC Ties by the 
Integrated Marketplace.”12 SPP adds this reference to the rate sheets where Incremental 
Market Efficiency Use revenues are applicable. 
 
Fourth, SPP removes the reference to Attachment AU revenues. Due to an 
administrative error, SPP mistakenly included references to Attachment AU revenues 
rate sheets for Loveland Area Projects, SPP West Region Average, and Tri-State G&T 
Association-West in the SPP West Region. As explained in the SPP Expansion Filing, 
Attachment AU revenues are allocated only to Transmission Owners in the SPP East 
Region.13 
 
III. 
EFFECTIVE DATE  
 
 
For all the reasons discussed in this transmittal letter, SPP requests that the 
Commission accept the proposed revisions to the Tariff to become effective February 
 
11  
Tariff, Part I, Section 1 – Definitions D. 
12  
Tariff, Part I, Section 1 – Definitions I. 
13  
SPP Expansion Filing at 56. See also Tariff, Attachment AE, Section I (“Such 
revenues…shall be allocated to Transmission Owners in the SPP East Region 
based on the estimated flow impacts resulting from energy transfers between 
MISO north and south subregions, as described in this Attachment AU.”).

The Honorable Debbie-Anne A. Reese 
November 6, 2026 
Page 6 
 
1, 2027, which is not less than 60 days or more than 120 days prior to the submission 
of this filing as required by the Commission.14 
 
IV. 
ADDITIONAL INFORMATION 
 
A. 
Documents submitted with this filing: 
 
In addition to this Transmittal Letter, SPP provides with this filing Clean 
and Redlined Tariff revisions under the Sixth Revised Volume No. 1.15 
 
B. 
Service: 
 
SPP has electronically served a copy of this filing on all its Members, 
Transmission Customers and Market Participants. A complete copy of 
this filing will be posted on the SPP web site, www.spp.org, and is also 
being served on all affected state commissions. 
 
C. 
Requisite agreements: 
 
There are none.  
 
D. 
Communications 
Correspondence and communications with respect to this filing should 
be sent to, and SPP requests the Secretary to include on the official 
service list, the following: 
 
Justin A. Hinton 
Senior Attorney 
Southwest Power Pool, Inc. 
201 Worthen Drive 
Little Rock, AR 72223 
Telephone: (501) 482-2468 
jhinton@spp.org  
 
Tessie Kentner 
Director & Associate General Counsel 
Southwest Power Pool, Inc. 
201 Worthen Drive 
Little Rock, AR 72223 
Telephone: (501) 688-1782 
tkentner@spp.org  
 
14  
18 C.F.R. § 35.3(a)(1). 
15  
Attachment T for the WAPA-CRSP Zone contains language in italics, which is 
pending before the Commission in Docket No. ER26-1136. SPP requests that 
the Commission accept the proposed revisions to this tariff sheet subject to the 
outcome of hearing and settlement judge procedures in Docket No. ER26-1136.

The Honorable Debbie-Anne A. Reese 
November 6, 2026 
Page 7 
 
V. 
CONCLUSION 
 
 
For the foregoing reasons discussed in this transmittal letter, SPP respectfully 
requests that the Commission find the proposed revisions just and reasonable and not 
unduly discriminatory or preferential, and issue an order accepting the Tariff revisions 
with an effective date of February 1, 2027. 
 
Respectfully submitted, 
 
/s/ Justin A. Hinton 
Justin A. Hinton 
Southwest Power Pool, Inc. 
201 Worthen Drive 
Little Rock, AR  72223-4936 
  
Attorney for  
Southwest Power Pool, Inc.