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B-333959 Jan 25, 2022 1 (2022-01-25)

handle is hein.gao/gaomrt0001 and id is 1 raw text is: GAO U.S. GOVERNMENT ACCOUNTABILITY OFFICE
441 G St. N.W.
Washington, DC 20548
B-333959
January 25, 2022
The Honorable Joe Manchin
Chairman
The Honorable John Barrasso
Ranking Member
Committee on Energy and Natural Resources
United States Senate
The Honorable Frank Pallone, Jr.
Chairman
The Honorable Cathy McMorris Rodgers
Republican Leader
Committee on Energy and Commerce
House of Representatives
Subject: Department of Energy, Federal Energy Regulatory Commission: Managing
Transmission Line Ratings
Pursuant to section 801(a)(2)(A) of title 5, United States Code, this is our report on a major rule
promulgated by the Department of Energy, Federal Energy Regulatory Commission (FERC)
entitled Managing Transmission Line Ratings (Docket Number: RM20-16-000). We received
the rule on December 29, 2021. It was published in the Federal Register as a final rule on
January 13, 2022. 87 Fed. Reg. 2244. The effective date is March 14, 2022.
According to FERC, the final rule revises both the pro forma Open Access Transmission Tariff
and FERC's regulations under the Federal Power Act, 16 U.S.C. §§ 791a et seq., to improve the
accuracy and transparency of electric transmission line ratings. Specifically, FERC stated the
final rule requires: public utility transmission providers to implement ambient-adjusted ratings on
the transmission lines over which they provide transmission service; regional transmission
organizations (RTO) and independent system operators (ISO) to establish and implement the
systems and procedures necessary to allow transmission owners to electronically update
transmission line ratings at least hourly; public utility transmission providers to use uniquely
determined emergency ratings; public utility transmission owners to share transmission line
ratings and transmission line rating methodologies with their respective transmission provider(s)
and with market monitors in RTOs/ISOs; and public utility transmission providers to maintain a
database of transmission owners' transmission line ratings and transmission line rating
methodologies on the transmission provider's Open Access Same-Time Information System site
or other password-protected website.
Enclosed is our assessment of FERC's compliance with the procedural steps required by
section 801(a)(1)(B)(i) through (iv) of title 5 with respect to the rule. If you have any questions
about this report or wish to contact GAO officials responsible for the evaluation work relating to

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