Revision: July 10, 2018
NorthWestern Energy Transmission Planning and Attachment K Business Practice
Links Document
This Business Practice provides URLs addresses to NorthWestern Energy’s (“NWE”) local planning documents and business practices. URL addresses for Northern Tier Transmission Group (“NTTG”) regional and Western Electric Coordinating Council (“WECC”) interconnection wide planning documents are also included within this business practice. These links are directed to specific documents, business practices and folders that are stored on the following websites:
- NWE OASIS (
- NTTG Regional website (
- WECC Interconnection wide website (
Accessing these documents will provide information on NWE’s Attachment K, local transmission planning business practices, processes and results and other informational documents.
Please refer to the Index table on page 2.
Broken Link
Please report any broken link to:
Section Index:
1. FERC Order 890 & 1000 Local Transmission Planning and Attachment K Link Information
A. Attachment K
B. Attachment K – Intervention
C. CEII
D. Calendar of Events and Study Cycle
E. Comments on behalf of...
F. Confidentiality Agreement
G. Economic Congestion Studies (Economic Studies)
H. Frequently Asked Questions
I. How to Contact Us
J. L&R Data Request
K. LTP Study Cycle – Data Collection
L. Load Forecast – Forecast
M. Local Cost Allocation Methodology
N. Local Transmission Plan
O. NWE Anti-Trust and SOC
P. Attachment K Business Practice
Q. Business Practice ETP Method Criteria & Process
R. Open Access Transmission Tariff (OATT)
S. Planning Docs Process for Amending Documentation
T. Transmission Advisory Committee (TRANSAC) – How to Become Involved
U. Transmission Advisory Committee (TRANSAC) Charter
V. Other Transmission Planning Links
W. Public Policy Project Request
2. NTTG Regional Link Information
A. NTTG Home Page (includes map)
B. Planning - Biennial Reports
C. Calendar
D. Charters & Agreements
E. NTTG Cost Allocation Principles
F. NTTG Attachment K Documents and NTTG Business Practices
G. NTTG Economic Congestion Studies
H. NTTG Frequently Asked Questions
I. NTTG Planning Committee Home Page
J. NTTG POR POD Map
K. NTTG Planning Cycle
L. NTTG Regional Planning and Cost Allocation Practices
M. NTTG Study Plan
N. NTTG FERC Order 1000 Information
3. WECC Interconnection Wide Link Information
A. WECC Home Page
B. WECC Reliability Assessment Committee (RAC)
C. WECC Closed Session Confidentiality Agreement for non-group member participants
1. FERC Order 890 & 1000Local Transmission Planning and Attachment K Link Information
Documents in this section address FERC Order 890 and FERC Order 1000 - Local Transmission Planning and are currently in effect.
A. Attachment K
LOCAL and REGIONAL
*EFFECTIVE*
Fourth Regional Compliance filing, submitted December 30, 2014 (which applies to the 2014-2015 Local Area Planning Cycle) was accepted by FERC March 24, 2015 with an Effective date of October 1, 2013 and matches the OATT. Attachment K revisions were submitted on December 30, 2014 in Docket No. ER13-67-003 to comply with FERC’s December 8, 2014 Order.
FERC Acceptance Letter
Attachment K-Effective 10/1/2013
INTER-REGIONAL
*EFFECTIVE*
Second Interregional, submitted February, 18, 2015 – NTTG FERC Order Joint Compliance filing was in response to the December 18, 2014 Order on Interregional requirements. On June 1, 2015 FERC issued a final order accepting the Western Filing Parties Interregional compliance filings in Docket No. ER13-1448-001.
Attachment K-Effective 6/1/2015
B. Attachment K – Intervention
Currently there are no intervention documents.
C. CEII
Posted Critical Energy Infrastructure Information (CEII)
D. Calendar of Events and Study Cycle
2018 Calendar of Events and Study Cycle
2017 Calendar of Events and Study Cycle
E. Comments on behalf of...
Currently there are no ‘Comments on behalf of...’ documents.
F. Confidentiality Agreement
Confidentiality Agreement Form 3359 12.04
Shortcut to:
G. Economic Congestion Studies (Economic Studies)
Economic Congestion Study 2016-2017 Cycle
Economic Study Request Listing & Meeting Information
2018 Economic Congestion Study Submittal Reminder
Economic Study Request Form
Other Info on EconomicStudies
Note: A description of the process, procedure, and methodology for processing Additional Economic Congestion Studies is available in the “Attachment K Business Practice”. See Section 1.P of this document.
H. Frequently Asked Questions
I. How to Contact Us
J. L&R Data Request
L&R Data Request 2017 includes the following Documents:
Generation Request Letter-NWE 2017
Generation Data Request 2017
Load Request Letter-NWE 2017
Load Data Request 2017
WECC 2017 Data Manual Section 2
Note: Additional information regarding the Load and Resource (L&R) Data Requests can be found on NWE’s OASIS site in the “Transmission Planning – Attachment K” folder. Under the “L&R Data Request” folder there is a folder for individual annual L&R Data Request cycles (such as “Customer L&R Data Request Information-2017”).
Shortcut to:
K. LTP Study Cycle – Data Collection
2016-2017 LTP Study Cycle – Data Collection – Timeline (effective 10-17-13 per FERC)
Annual Stakeholder Reminder Submittal-2018
Submitting Alternative Solutions
L. Load Forecast – Forecast
Spring 2017-2018 Load Forecast – 05-07-18
M. Local Cost Allocation Methodology
2008 Local Cost Allocation Methodology Projects outside OATT effective 05-14-08
Shortcut to:
N. Local Transmission Plan
2016-2017 Planning Cycle
2016-2017 Electric Transmission Local Area Plan – Final
NWMT 2016-2017 Local Area Plan Development & Distribution
2014-2015 Planning Cycle
2014-2015 Electric Transmission Local Area Plan – 11-10-15 Final
NWMT 2014-2015 Local Area Plan Development & Distribution
O. NWE Anti-Trust and SOC
2009 NWEAnti-Trust and SOC 03-17-09
Shortcut to:
P. Attachment K Business Practice
2017 Attachment K Business Practice - approved 12/22/17, effective 12/28/17.
Q. Business Practice ETP Method Criteria & Process
2018 Business Practice ETP Methodology, Criteria and Process - approved 06/10/18, effective 06/15/18.
R. Open Access Transmission Tariff (OATT)
Transmission Services Procedures: Business Practice
Open Access Transmission Tariff Vol. 5
Accepted, effective date– March 12, 2016
NorthWestern Corporation, FERC Docket: ER16-707-000 (March 7, 2016)
Table of Contents
NOTE: Each Part, Attachment, and Schedule is posted separately and to lengthy to list. Please go to:
1)NorthWestern Energy’s OASIS website, (
2)open the ‘Tariffs/FERC Filings’ folder,
3)open the ‘Current NWE MT OATT’ folder – all files are listed in this sub-folder
S. Planning Docs Process for Amending Documentation
2017 Planning Documents Amend Process
Document Posting Log (tracks the documents being amended)
T. Transmission Advisory Committee (TRANSAC) – How to Become Involved
U. Transmission Advisory Committee (TRANSAC) Charter
2014 TRANSAC Charter 12-16-14
V. Other Transmission Planning Links
On NWE’s OASIS website, there are a number of folders containing various documents and materials regarding transmission planning activities. The following shortcut will bring you to NWE’s OASIS website.
Shortcut to:
The folders outlining Transmission Planning include:
Transmission Planning
Transmission Planning – Attachment K
Transmission Planning – Economic Studies
Transmission Planning – TRANSAC
W. Public Policy Project Request
Instructions for Public Policy Project Request
Workbook to submit Public Policy Project Request
2. NTTG Regional Link Information
Documents in this section address FERC Orders890 & 1000Regional (NTTG)Transmission Planning. These documents are currently in effect.
A. NTTG Home Page (includes map)
B. Planning - Biennial Reports
2016-2017
2016-2017 NTTG Final Regional Transmission Plan Approved-December 14, 2017
2016-2017 NTTG Regional Transmission Plan FINAL – December 28, 2017
2016-2017 NTTG Regional Transmission Reports
2014-2015
2014-2015 NTTG Final Regional Transmission Plan Approved-December 17, 2015
2014-2015 NTTG Regional Transmission Plan FINAL – 12-30-2015
2014-2015 NTTG Regional Transmission Reports
2014-2015 NTTG Cost Allocation Workbook Final
C. Calendar
D. Charters & Agreements
Includes NTTG Agreements, NTTG Committee Charters, Executed NTTG Planning Agreements and Anti-Trust Policy
E. NTTG Cost Allocation Principles
Contains an explanation of the NTTG cost allocation principles and process (Published September 6, 2007).
2010-2011 NTTG Cost Allocation Committee Final Report (11/14/11 and published April 22 2013)
F. NTTG Attachment K Documents and NTTG Business Practices
G. NTTG Economic Congestion Studies
H. NTTG Frequently Asked Questions
I. NTTG Planning Committee Home Page
Contains members, process documents and meeting information, data submittals, reports, and other general information, in addition to the links to specific documents described below.
J. NTTG POR POD Map
A map of the Point-of-Receipt and Point-of-Delivery can be found on the NTTG website at the following URL address.
K. NTTG Planning Cycle
L. NTTG Regional Planning and Cost Allocation Practices
This is part of the FERC Order 1000 filing. See Section 0. NTTG FERC Order 1000 Information.
M. NTTG Study Plan
Study plan containing the assumptions, data, and tools used in conducting the current biennial planning cycle.
NTTG 2016-2017 Biennial Study Plan APPROVED 07-20-2016
Amended Quarter 6 NTTG 2016-17 Biennial Study Plan Approved - 08-02-2017
NTTG 2016-2017 Regional Transmission Plan Supporting Materials
The completed Biennial reports are shown in category B. of this document
N. NTTG FERC Order 1000 Information
At this site are documents and/or updates for Regional and Interregional documents for activity related to FERC Order 1000.
FERC Order 1000: Regional
FERC Order 1000: Interregional
3. WECC Interconnection Wide Link Information
Documents in this section address FERC Orders890 & 1000Interconnection Wide (WECC)information. These documents are currently in effect.
A. WECC Home Page
Shortcut to:
B. WECC Reliability Assessment Committee (RAC)
Shortcut to:
The WECC Planning Coordination Committee is made up of four subcommittees:
Studies Subcommittee
ScenarioDevelopment Subcommittee
Modeling Subcommittee
Data Subcommittee
C. WECC Closed Session Confidentiality Agreement for non-group member participants
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