Order for RD26-10

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FEDERAL ENERGY REGULATORY COMMISSION
WASHINGTON, D.C. 20426
OFFICE OF ELECTRIC RELIABILITY
North American Electric Reliability Corporation
Docket No. RD26-10-000
September 30, 2026
North American Electric Reliability Corporation
1401 H Street, N.W., Suite 410
Washington, D.C. 20005
Attention:

Lauren Perotti, Assistant General Counsel
Alain Rigaud, Associate Counsel
North American Electric Reliability Corporation

Reference:

Petition of the North American Electric Reliability Corporation for
Approval of Proposed Reliability Standard PRC-029-2

Dear Ms. Perotti:
On August 28, 2026, as amended on September 1, 2026, the North American
Electric Reliability Corporation (NERC) filed a petition seeking approval of proposed
Reliability Standard PRC-029-2 (Frequency and Voltage Ride-through Requirements for
Inverter-Based Resources); the associated implementation plan, violation risk factors, and
violation severity levels; and the retirement of currently effective Reliability Standard
PRC-029-1.
NERC explains that the proposed Reliability Standard would advance the
reliability of the Bulk-Power System and address the issues identified in Order No. 909
by narrowly expanding the exemption criteria for IBR ride-through requirements in
proposed Reliability Standard PRC-029-2 to include projects: (i) under active
development with an executed interconnection agreement and equipment procurement
contract in place by the applicable effective dates; and (ii) high voltage direct current
(HVDC)-connected IBRs with a well-documented hardware limitation. NERC states that
these limited exemptions would help the included resources avoid unnecessary delays,
abandonment, or retirement, and ensure that these resources remain in or come into
service to support resource adequacy and generation capacity demands.1
NERC further explains that the proposed standard would revise the voltage ride1

NERC Petition at 2.

Docket No. RD26-10-000

-2-

through criteria in Attachment 1 to add Item 12 to address the technical limitation of
HVDC-connected IBRs using choppers to connect to the alternating current (AC) grid.
Proposed Item 12 would exempt HVDC-connected IBRs with choppers from the ridethrough criteria in Items 7, 8, and 9, as the integrated system is inherently unable to meet
these specific criteria without safety or damage risk.2
NERC’s filing was published in the Federal Register, 91 Fed. Reg. 57145 (Sept. 8,
2026), with interventions and protests due on or before September 28, 2026. Timely,
unopposed motions to intervene were filed by Deriva Energy, LLC (Deriva), Leeward
Renewable Energy, LLC (Leeward), and TerraForm Power Parent LLC. Ørsted Wind
Power North America, LLC (Orsted), Deriva and Leeward (collectively, Indicated Wind
IBR Entities), and American Clean Power Association and Solar Energy Industries
Association (collectively, Clean Energy Associations) filed comments in support of
NERC’s petition.3 Electric Reliability Council of Texas, Inc. (ERCOT) filed comments
taking “no position on whether the Commission should approve PRC-029-2 or whether
PRC-029-2 aligns with the Commission directives in Order No. 909.”4
Pursuant to the relevant authority delegated to the Director of the Office of
Electric Reliability (OER) under 18 C.F.R. § 375.303(b)(1)(i) (2025), the timely,
unopposed motions to intervene serve to make the entities that filed them parties to this
proceeding. Further, NERC’s uncontested filing is hereby approved pursuant to the
relevant authority delegated to the Director of OER under 18 C.F.R. § 375.303(a)(2)(i),
effective as of the date of this order.
This action shall not be construed as approving any other application pursuant to
18 C.F.R. § 375.303(a)(2)(i). Such action shall not be deemed as recognition of any
claimed right or obligation associated therewith and such action is without prejudice to
any findings or orders that have been or may hereafter be made by the Commission in
any proceeding now pending or hereafter instituted by or against the Electric Reliability
Organization or any Regional Entity.
This order constitutes final agency action. Requests for rehearing by the
Commission may be filed within 30 days of the date of issuance of this order, pursuant to
18 C.F.R. § 385.713 (2025).

2

Id. at 11.
Ørsted Comments at 1; Indicated Wind IBR Entities Comments at 1; Clean
Energy Associations Comments at 1.
4
ERCOT Comments at 1.
3

Docket No. RD26-10-000

-3Sincerely,
by Kal Ayoub
Kal
Date:
Ayoub 2026.09.30
15:22:16 -04'00'

Digitally signed

Kal Ayoub, Director
Office of Electric Reliability