I 
117TH CONGRESS 
1ST SESSION H. R. 4499 
To amend the Internal Revenue Code of 1986 to support upgrades at existing 
hydroelectric dams and the removal of obsolete river obstructions to 
improve the health of the Nation’s rivers and associated wildlife habitat 
and increase clean energy production, public safety, and for other pur-
poses. 
IN THE HOUSE OF REPRESENTATIVES 
JULY 16, 2021 
Mr. YOUNG (for himself, Ms. KUSTER, Mr. FITZPATRICK, and Ms. DELBENE) 
introduced the following bill; which was referred to the Committee on 
Ways and Means 
A BILL 
To amend the Internal Revenue Code of 1986 to support 
upgrades at existing hydroelectric dams and the removal 
of obsolete river obstructions to improve the health of 
the Nation’s rivers and associated wildlife habitat and 
increase clean energy production, public safety, and for 
other purposes. 
Be it enacted by the Senate and House of Representa-
tives of the United States of America in Congress assembled, 
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SECTION 1. SHORT TITLE. 
This Act may be cited as the ‘‘Maintaining and En-
hancing Hydroelectricity and River Restoration Act of 
2021’’. 
SEC. 2. CREDIT FOR MAINTAINING AND ENHANCING HY-
DROELECTRIC DAMS. 
(a) IN GENERAL.—Subpart E of part IV of sub-
chapter A of chapter 1 of the Internal Revenue Code of 
1986 is amended by adding after section 48C the following 
new section: 
‘‘SEC. 48D. CREDIT FOR MAINTAINING AND ENHANCING HY-
DROELECTRIC DAMS. 
‘‘(a) IN GENERAL.—For purposes of section 46, the 
credit for maintaining and enhancing hydroelectric dams 
for any taxable year is 30 percent of the basis of any quali-
fied dam safety, environmental, and grid resilience en-
hancement property placed in service during such taxable 
year. 
‘‘(b) LIMITATION.—No credit shall be allowed under 
subsection (a) with respect to any qualified dam safety, 
environmental, and grid resilience property unless the 
qualified dam in connection with which such property was 
placed in service meets all applicable Federal, State, and 
tribal requirements with respect to such dam on the date 
such property is placed in service. 
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‘‘(c) CERTAIN
PROGRESS
EXPENDITURE
RULES 
MADE APPLICABLE.—Rules similar to the rules of sub-
sections (c)(4) and (d) of section 46 (as in effect on the 
day before the date of the enactment of the Revenue Rec-
onciliation Act of 1990) shall apply for purposes of sub-
section (a). 
‘‘(d) DEFINITIONS.—For purposes of this section— 
‘‘(1) 
QUALIFIED
DAM
SAFETY, 
ENVIRON-
MENTAL, AND
GRID
RESILIENCE
PROPERTY.—The 
term ‘qualified dam safety, environmental, and grid 
resilience enhancement property’ means any prop-
erty— 
‘‘(A) which is— 
‘‘(i) dam safety property, 
‘‘(ii) 
environmental 
improvement 
property, or 
‘‘(iii) grid resilience property, 
‘‘(B)(i) the construction, reconstruction, or 
erection of which is completed by the taxpayer, 
or 
‘‘(ii) which is acquired by the taxpayer if 
the original use of such property commences 
with the taxpayer, and 
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