20260319Petition to Intervene.pdf

RECEIVED
March 19, 2026
Peter J. Richardson ISB No. 3195 IDAHO PUBLIC
Richardson Adams, PLLC UTILITIES COMMISSION
515 N. 271h Street
Boise, Idaho 83702
Telephone: [phone]
Fax: [phone]
[e-mail]
Attorneys for Clearwater Paper Corporation
BEFORE THE
IDAHO PUBLIC UTILITIES COMMISSION
IN THE MATTER OF THE APPLICATION OF)
AVISTA CORPORATION FOR APPROVAL ) CASE NO. AVU-E-26-01
TO INCREASE ITS ENERGY EFFICIENT )
TARIFF RIDER ADJUSTMENT SCHEDULE )
91 ) PETITION TO INTERVENE OF
CLEARWATER PAPER
CORPORATION
COMES NOW, CLEARWATER PAPER CORPORATION, hereinafter referred to as
"Intervenor," and pursuant to the Rules of Procedure of the Idaho Public Utilities Commission
("Commission"), Rule 71 IDAPA 31.01.01.71 and hereby petitions the Commission for leave to
intervene herein and to appear and participate herein as a party, and as grounds therefore states
as follows:
1. The name and address of this Intervenor is:
Clearwater Paper Corporation
c/o Peter J. Richardson
Richardson Adams, PLLC
515 N. 271h St
Boise, Idaho 83702
Telephone: [phone]
peter&richardsonanadams.com

Copies of all pleadings, production requests, production responses, Commission orders
and other documents should be provided to Peter J. Richardson as noted above and to:
Carol Haugen, Vice President, Deputy General Counsel
[e-mail]
Randi Johnson, Sr. Corporation Counsel
Randi.Johnson c Clearwaterpaper.com
Jamie McDonald, Vice President, Purchasing
Jamie.mcdonald@clearwateKpai)er.com
2. This Intervenor, Clearwater Paper Corporation, is Avista's largest electric
customer in Idaho. Clearwater Paper Corporation claims a direct and substantial interest in this
proceeding in that its rates for electric service from Avista will be affected by the outcome of this
proceeding.
3. This Intervenor intends to participate herein as a party, and if necessary, to
introduce evidence, cross-examine witnesses, call and examine witnesses, and be heard in
argument. The nature and quality of evidence which this Intervenor will introduce is dependent
upon the nature and effect of other evidence in this proceeding.
4. Without the opportunity to intervene herein,this Intervenor would be without any
means of participation in this proceeding which may have a material impact on its members'
electric rates and the terms and conditions of such service.
5. Granting this Intervenor's petition to intervene will not unduly broaden the issues
nor will it prejudice any party to this case.
WHEREFORE, Clearwater Paper Corporation respectfully request that this Commission
grant its Petition to Intervene in these proceedings and to appear and participate in all matters as
CLEARWATER PAPER CORPORATION'S PETITION TO INTERVENE
AVU-E-26-01 -2

may be necessary and appropriate; and to present evidence, call and examine witnesses, present
argument and to otherwise fully participate in these proceedings.
DATED this 19t" day of March 2026.
Richardson Adams, PLLC
By 0
Peter J. Richardson
Richardson Adams, PLLC
Attorneys for Clearwater Paper
Corporation
CLEARWATER PAPER CORPORATION'S PETITION TO INTERVENE
AVU-E-26-01 -3

CERTIFICATE OF SERVICE
I HEREBY CERTIFY that on the 19th day of March 2026 I served a true and correct copy of the
Clearwater Paper Corporation's Petition to Intervene in AVU-E-26-01 upon the following, by
electronic mail only.
Secretary,
Idaho Public Utilities Commission
secretary [e-mail]
Monica Barrios-Sanchez
monica.barriossanchezgpuc.idaho.gov
11331 West Chinden Blvd, Bldg 8
Boise, Idaho 83720
Anni Glogovac
Avista Corporation
PO Box 3727, MSC 33
1411 E. Mission Avenue
Spokane, WA 99220-3727
[e-mail]
Shawn Bonfield
Avista Corporation
PO Box 3727, MSC 27
1411 E. Mission Avenue
Spokane, WA 99220-3727
Shawn.bonfield n.avistacog?.com
P441 of
Peter Richardson
ISB # 3195
CLEARWATER PAPER CORPORATION'S PETITION TO INTERVENE
AVU-E-26-01 -4