20260605Tariff Advice No. IPC-TAE-26-04.pdf

-0IQAHO POWER.
RECEIVED
GRANT T. ANDERSON June 5, 2026
Pricing and Tariff Manager IDAHO PUBLIC
ganderson(a)-idahopower.com UTILITIES COMMISSION
June 5, 2026
VIA ELECTRONIC FILING
Commission Secretary
Idaho Public Utilities Commission
11331 W. Chinden Blvd., Bldg 8,
Suite 201-A (83714)
PO Box 83720
Boise, Idaho 83720-0074
Re: Tariff Advice No. IPC-TAE-26-04
Modifications to Rule J — Continuity, Curtailment and Interruption of Electric
Service
Dear Commission Secretary:
Pursuant to Commission Rule of Procedure 134 (IDAPA 31.01.01.134.01), Idaho
Power Company ("Idaho Power" or "Company") hereby submits proposed administrative
revisions to Rule J — Continuity, Curtailment and Interruption of Electric Service ("Rule
J"). The following tariff sheets identify the proposed revisions:
First Revised Sheet No. J-1 Cancelling Original Sheet No. J-1
First Revised Sheet No. J-2 Cancelling Original Sheet No. J-2
First Revised Sheet No. J-4 Cancelling Original Sheet No. J-4
The proposed revisions update Rule J to reflect the Company's current operational
framework and improve consistency with existing practices and regulatory obligations.
These updates include: (1) incorporation of references to the Commission-approved
Wildfire Mitigation Plan; (2) the addition of safety-related language within the Load
Curtailment and Interruption Plan to align with how the Company operates the system;
and (3) removal of language that is not a standard provision in the tariffs of other
Commission-regulated electric utilities in Idaho. These changes improve clarity and
consistency within the rule and are consistent with its existing purpose and scope.
The Company respectfully requests that the proposed revisions to Rule J be
accepted with an effective date of July 7, 2026.
P.O.Box 70(83707)
1221 W.Idaho St.
Boise,ID 83702

Idaho Public Utilities Commission June 5,2026
If you have any questions regarding this tariff advice, please contact Senior
Regulatory Analyst Ashley Herrera at 208-388-2656 or aherrera(a-).idahopower.com.
Sincerely,
r""-
Grant T. Anderson
GTA:sg
Attachments
Idaho Power Page 2 of 2

Idaho Power Company First Revised Sheet No. J-1
Cancels
I.P.U.C. No. 30, Tariff No. 101 Original Sheet No. J-1
RULE J
CONTINUITY, CURTAILMENT AND
INTERRUPTION OF ELECTRIC
SERVICE
1. Electric Service is inherently subject to occasional interruption, suspension, curtailment,
and fluctuation. The Company designs and operates its system in conformance with the service voltage
ranges described in the current edition of standard C84.1 of the American National Standards Institute —
American National Standard for Electric Power Systems and Equipment — Voltage Ratings (60HZ) and
will have no liability to its Customers or any other persons for any interruption, suspension, curtailment, or
fluctuation in service or for any loss or damage caused thereby if such interruption, suspension,
curtailment, or fluctuation results from any of the following:
a. Causes beyond the Company's reasonable control including, but not limited to,
fire, flood, drought, winds, acts of the elements, court orders, insurrections or riots, generation
failures, lack of sufficient generating capacity, breakdowns of or damage to facilities of the
Company or of third parties, acts of God or public enemy, strikes or other labor disputes, civil,
military or governmental authority, electrical disturbances originating on or transmitted through
electrical systems with which the Company's system is interconnected, and acts or omissions of
third parties;
b. Repair, maintenance, improvement, renewal or replacement work on the
Company's electrical system, which work in the sole judgment of the Company is necessary or
prudent; to the extent practicable work shall be done at such time as will minimize inconvenience
to the Customer and, whenever practicable, the Customer shall be given reasonable notice of
such work;
C. Automatic or manual actions taken by the Company, including, but not limited to,
load curtailment or actions under or related to a commission-approved Wildfire Mitigation Plan,
which in its sole judgment are necessary or prudent to protect the performance, integrity,
reliability, safety, or stability of the Company's electrical system or any electrical system with which
it is inter-connected.
2. Load curtailment and interruption carried out in compliance with an order by governmental
authority shall follow the Company's plan entitled "Load Curtailment and Interruption Plan", as outlined
below.
IDAHO Issued by IDAHO POWER COMPANY
Issued —June 5, 2026 Timothy E. Tatum, Vice President, Regulatory Affairs
Effective—July 7, 2026 1221 West Idaho Street, Boise, Idaho
Advice No. 26-04

Idaho Power Company First Revised Sheet No. J-2
Cancels
I.P.U.C. No. 30, Tariff No. 101 Original Sheet No. J-2
RULE J
CONTINUITY, CURTAILMENT AND
INTERRUPTION OF ELECTRIC
SERVICE
LOAD CURTAILMENT AND INTERRUPTION PLAN:
OVERVIEW
1. The Company will comply with all state and federal mandates to curtail the electric
energy used by its Customers to prevent an electrical system collapse. Events that may trigger load
curtailment, either upon notice from state agencies, the Regional Reliability Coordinator, or at the
discretion of the Company, include but are not limited to:
a. Fire, flood, drought, winds, generation failures, lack of sufficient generating capacity,
equipment failures, governmental authority,
b. Actions taken to protect the performance, integrity, reliability or stability of the
Company's electrical system or any electrical system to which it is interconnected, which
actions may occur automatically or manually,
c. Actions taken by the Company that in its sole judgment are necessary or prudent for the
safety of people and/or equipment, or
d. Cyber-attacks or software failure of any part of the Company's generation, transmission,
and/or distribution system protection and/or control systems.
2. Load curtailment can last for a short amount of time, but also could last for hours or even
days.
AUTOMATIC, REMOTE AND MANUAL ACTIONS
1. Automatic actions occur through the operation of programmed protective equipment
installed on the Company's electrical system, including, without limitation, equipment such as automatic
relays, generator controls, circuit breakers, and switches. This protection equipment is preset to
operate under certain prescribed conditions that, in the sole judgment of the Company, threaten system
performance, integrity, safety, reliability or stability.
2. Where Supervisory Control and Data Acquisition (SCADA) equipment is installed, the
Company will remotely control switches, circuit breakers, relays, voltage regulators or other equipment.
In areas where no SCADA equipment is installed, actions are performed manually by on-site field
personnel.
3. If actions are undertaken, then to the extent permitted by the operating characteristics of
the electrical system, the Company will perform such actions so that interruption, curtailment, or
fluctuation of service to customers will be accomplished sequentially, unless it is necessary in the sole
judgment of the Company, or if required by the Regional Reliability Coordinator to vary said sequence
in order to protect system performance, integrity, safety, reliability or stability.
IDAHO Issued by IDAHO POWER COMPANY
Issued —June 5, 2026 Timothy E. Tatum, Vice President, Regulatory Affairs
Effective—July 7, 2026 1221 West Idaho Street, Boise, Idaho
Advice No. 26-04

Idaho Power Company First Revised Sheet No. J-4
Cancels
I.P.U.C. No. 30, Tariff No. 101 Original Sheet No. J-4
RULE J
CONTINUITY, CURTAILMENT AND
INTERRUPTION OF ELECTRIC
SERVICE
ROTATING OUTAGES AND ONGOING CURTAILMENT (Continued)
Stage Nature Type of Curtailment
1 All generation resources are committed. • Non-firm wholesale energy sales
Firm Customer load, firm transactions, • Ask Customers to voluntarily take
and reserve commitments are met. conservation measures
Concerned about sustaining required . Issue communications notifying
Contingency Reserves employees of the situation and asking
Company departments to reduce internal
utility energy use.
2 Idaho Power is no longer able to . Curtailment actions listed in Stage 1
provide expected energy requirements . Interruptible Customer load and available
demand response programs
• Issue communications requesting
government agencies to implement their
programs to achieve necessary energy
reductions
3 Idaho Power is unable to meet minimum • Curtailment actions listed in Stage 1 and
Contingency Reserves as required by Stage 2
NERC Standards . Implement Emergency Load Shed and
Block Rotation
4 Emergency Load Shed due to • Applicable to all Customers. May be
immediate risk posed to electrical limited to a specific location if reliability risk
reliability. is local to an area.
3. Demand response programs, if deployed as a required action under this plan, will not be
operated under the provisions of Schedules 23, 81, and 82. The provisions of Schedules 23, 81, and
82, including but not limited to operating hours, notification requirements, and incentive payments will
not apply for any time period that the Company utilizes a Load Control Device installed under the
programs to interrupt a participating customer's load for an electric system emergency.
RETURN TO SERVICE
Idaho Power will return service to its Customers when:
• The Company can meet its load and required operating reserves.
• All situations and/or conditions are safe.
• The reliability of the electric system will not be jeopardized.
• Reliability Coordinator approval has been received, if applicable.
IDAHO Issued by IDAHO POWER COMPANY
Issued —June 5, 2026 Timothy E. Tatum, Vice President, Regulatory Affairs
Effective—July 7, 2026 1221 West Idaho Street, Boise, Idaho
Advice No. 26-04

Idaho Power Company Original-First Revised Sheet No. J-1
Cancels
I.P.U.C. No. 30, Tariff No. 101 First Reviso,[Original Sheet No. J-1
RULE J
CONTINUITY, CURTAILMENT AND
INTERRUPTION OF ELECTRIC
SERVICE
1. Electric Service is inherently subject to occasional interruption, suspension, curtailment,
and fluctuation. The Company designs and operates its system in conformance with the service voltage
ranges described in the current edition of standard C84.1 of the American National Standards Institute —
American National Standard for Electric Power Systems and Equipment — Voltage Ratings (60HZ) and
will have no liability to its Customers or any other persons for any interruption, suspension, curtailment, or
fluctuation in service or for any loss or damage caused thereby if such interruption, suspension,
curtailment, or fluctuation results from any of the following:
a. Causes beyond the Company's reasonable control including, but not limited to,
fire, flood, drought, winds, acts of the elements, court orders, insurrections or riots, generation
failures, lack of sufficient generating capacity, breakdowns of or damage to facilities of the
Company or of third parties, acts of God or public enemy, strikes or other labor disputes, civil,
military or governmental authority, electrical disturbances originating on or transmitted through
electrical systems with which the Company's system is interconnected, and acts or omissions of
third parties;
b. Repair, maintenance, improvement, renewal or replacement work on the
Company's electrical system, which work in the sole judgment of the Company is necessary or
prudent; to the extent practicable work shall be done at such time as will minimize inconvenience
to the Customer and, whenever practicable, the Customer shall be given reasonable notice of
such work;
C. Automatic or manual actions taken by the Company, including, but not limited to,
load curtailment or actions under or related to a commission-approved Wildfire Mitigation Plan,
which in its sole judgment are necessary or prudent to protect the performance, integrity,
reliability, safety, or stability of the Company's electrical system or any electrical system with which
it is inter-connected.
Z The provisions of this rule do not affect any person's rights in torF
3. Load curtailment and interruption carried out in compliance with an order by governmental
authority shall follow the Company's plan entitled "Load Curtailment and Interruption Plan", as outlined
below.
IDAHO Issued by IDAHO POWER COMPANY
Issued-—June 5, 2026per Order Ne. 36067 Timothy E. Tatum, Vice President, Regulatory Affairs
Effective—July 7, 2026 january , 1221 West Idaho Street, Boise, Idaho
Advice No. 26-04

Idaho Power Company 9riginal-First Revised Sheet No. J-2
Cancels
I.P.U.C. No. 30, Tariff No. 101 Original Sheet No. J-2
RULE J
CONTINUITY, CURTAILMENT AND
INTERRUPTION OF ELECTRIC
SERVICE
LOAD CURTAILMENT AND INTERRUPTION PLAN:
OVERVIEW
1. The Company will comply with all state and federal mandates to curtail the electric
energy used by its Customers to prevent an electrical system collapse. Events that may trigger load
curtailment, either upon notice from state agencies, the Regional Reliability Coordinator, or at the
discretion of the Company, include but are not limited to:
a. Fire, flood, drought, winds, generation failures, lack of sufficient generating capacity,
equipment failures, governmental authority,
b. Actions taken to protect the performance, integrity, reliability or stability of the
Company's electrical system or any electrical system to which it is interconnected, which
actions may occur automatically or manually,
c. Actions taken by the Company that in its sole judgment are necessary or prudent for the
safety of people and/or equipment, or
d. Cyber-attacks or software failure of any part of the Company's generation, transmission,
and/or distribution system protection and/or control systems.
2. Load curtailment can last for a short amount of time, but also could last for hours or even
days.
AUTOMATIC, REMOTE AND MANUAL ACTIONS
1. Automatic actions occur through the operation of programmed protective equipment
installed on the Company's electrical system, including, without limitation, equipment such as automatic
relays, generator controls, circuit breakers, and switches. This protection equipment is preset to
operate under certain prescribed conditions that, in the sole judgment of the Company, threaten system
performance, integrity, safety, reliability or stability.
2. Where Supervisory Control and Data Acquisition (SCADA) equipment is installed, the
Company will remotely control switches, circuit breakers, relays, voltage regulators or other equipment.
In areas where no SCADA equipment is installed, actions are performed manually by on-site field
personnel.
3. If actions are undertaken, then to the extent permitted by the operating characteristics of
the electrical system, the Company will perform such actions so that interruption, curtailment, or
fluctuation of service to customers will be accomplished sequentially, unless it is necessary in the sole
judgment of the Company, or if required by the Regional Reliability Coordinator to vary said sequence
in order to protect system performance, integrity, safety, reliability or stability.
IDAHO Issued by IDAHO POWER COMPANY
Issued per Order "�6067— June 5, 2026 Timothy E. Tatum, Vice President, Regulatory Affairs
Effective—July 7, 2026 aR aFy 1, z4 1221 West Idaho Street, Boise, Idaho
Advice No. 26-04

Idaho Power Company Original-First Revised Sheet No. J-4
Cancels
I.P.U.C. No. 30, Tariff No. 101 Original Sheet No. J-4
RULE J
CONTINUITY, CURTAILMENT AND
INTERRUPTION OF ELECTRIC
SERVICE
ROTATING OUTAGES AND ONGOING CURTAILMENT (Continued)
Stage Nature Type of Curtailment
1 All generation resources are committed. . Non-firm wholesale energy sales
Firm Customer load, firm transactions, . Ask Customers to voluntarily take
and reserve commitments are met. conservation measures
Concerned about sustaining required . Issue communications notifying
Contingency Reserves employees of the situation and asking
Company departments to reduce internal
utility energy use.
2 Idaho Power is no longer able to . Curtailment actions listed in Stage 1
provide expected energy requirements . Interruptible Customer load and available
demand response programs
• Issue communications requesting
government agencies to implement their
programs to achieve necessary energy
reductions
3 Idaho Power is unable to meet minimum . Curtailment actions listed in Stage 1 and
Contingency Reserves as required by Stage 2
NERC Standards . Implement Emergency Load Shed and
Block Rotation
4 Emergency Load Shed due to . Applicable to all Customers. May be
immediate risk posed to electrical limited to a specific location if reliability risk
reliability. is local to an area.
3. Demand response programs, if deployed as a required action under this plan, will not be
operated under the provisions of Schedules 23, 81, and 82. The provisions of Schedules 23, 81, and
82, including but not limited to operating hours, notification requirements, and incentive payments will
not apply for any time period that the Company utilizes a Load Control Device installed under the
programs to interrupt a participating customer's load for an electric system emergency.
RETURN TO SERVICE
Idaho Power will return service to its Customers when:
• The Company can meet its load and required operating reserves.
• All situations and/or conditions are safe.
• The reliability of the electric system will not be jeopardized.
• Reliability Coordinator approval has been received, if applicable.
IDAHO Issued by IDAHO POWER COMPANY
Issued _per Order No. 36067 June 5, 2026 Timothy E. Tatum, Vice President, Regulatory Affairs
Effective—July 7, 2026 aR aFy 1, z4 1221 West Idaho Street, Boise, Idaho
Advice No. 26-04