826 
tion of title II of the Clean Air Act (42 U.S.C. 7521 
et seq.). 
‘‘(4) BATTERY CAPACITY.—The term ‘capacity’ 
means, with respect to any battery, the quantity of 
electricity which the battery is capable of storing, ex-
pressed in kilowatt hours, as measured from a 100 
percent state of charge to a 0 percent state of 
charge. 
‘‘(e) LIMITATION ON NUMBER OF QUALIFIED PLUG- 
IN HYBRID VEHICLES ELIGIBLE FOR CREDIT.— 
‘‘(1) IN GENERAL.—In the case of a qualified 
plug-in hybrid vehicle sold during the phaseout pe-
riod, only the applicable percentage of the credit oth-
erwise allowable under subsection (a) shall be al-
lowed. 
‘‘(2) PHASEOUT PERIOD.—For purposes of this 
subsection, the phaseout period is the period begin-
ning with the second calendar quarter following the 
calendar quarter which includes the first date on 
which the number of qualified plug-in hybrid vehicles 
manufactured by the manufacturer of the vehicle re-
ferred to in paragraph (1) sold for use in the United 
States after the date of the enactment of this sec-
tion, is at least 60,000. 
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‘‘(3) APPLICABLE PERCENTAGE.—For purposes 
of paragraph (1), the applicable percentage is— 
‘‘(A) 50 percent for the first 2 calendar 
quarters of the phaseout period, 
‘‘(B) 25 percent for the 3d and 4th cal-
endar quarters of the phaseout period, and 
‘‘(C) 0 percent for each calendar quarter 
thereafter. 
‘‘(4) CONTROLLED GROUPS.—Rules similar to 
the rules of section 30B(f)(4) shall apply for pur-
poses of this subsection. 
‘‘(f) SPECIAL RULES.— 
‘‘(1) BASIS
REDUCTION.—The basis of any 
property for which a credit is allowable under sub-
section (a) shall be reduced by the amount of such 
credit (determined without regard to subsection (c)). 
‘‘(2) RECAPTURE.—The Secretary shall, by reg-
ulations, provide for recapturing the benefit of any 
credit allowable under subsection (a) with respect to 
any property which ceases to be property eligible for 
such credit. 
‘‘(3) 
PROPERTY
USED
OUTSIDE
UNITED 
STATES, ETC., NOT QUALIFIED.—No credit shall be 
allowed under subsection (a) with respect to any 
property referred to in section 50(b)(1) or with re-
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spect to the portion of the cost of any property 
taken into account under section 179. 
‘‘(4) ELECTION
NOT
TO
TAKE
CREDIT.—No 
credit shall be allowed under subsection (a) for any 
vehicle if the taxpayer elects to not have this section 
apply to such vehicle. 
‘‘(5) PROPERTY USED BY TAX-EXEMPT ENTITY; 
INTERACTION WITH AIR QUALITY AND MOTOR VEHI-
CLE SAFETY STANDARDS.—Rules similar to the rules 
of paragraphs (6) and (10) of section 30B(h) shall 
apply for purposes of this section.’’. 
(b) PLUG-IN VEHICLES NOT TREATED
AS NEW 
QUALIFIED HYBRID VEHICLES.—Section 30B(d)(3) is 
amended by adding at the end the following new subpara-
graph: 
‘‘(D) EXCLUSION OF PLUG-IN VEHICLES.— 
Any vehicle with respect to which a credit is al-
lowable under section 30D (determined without 
regard to subsection (c) thereof) shall not be 
taken into account under this section.’’. 
(c) CREDIT MADE PART OF GENERAL BUSINESS 
CREDIT.—Section 38(b) is amended— 
(1) by striking ‘‘and’’ each place it appears at 
the end of any paragraph, 
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