### Question
What is the definition of required allowances?


### Answer
The definition of **required allowances** is as follows in *42 U.S.C. § 7651o*:

> the allowances required to operate such unit for so much of the unit's useful life as occurs after January 1, 2000

#### Citation:
  - *42 U.S.C. § 7651o*
  - Heading: **CHAPTER 85-AIR POLLUTION PREVENTION AND CONTROL > SUBCHAPTER IV&ndash;A-ACID DEPOSITION CONTROL**

