### Question
How is the "required allowances" defined?


### Answer
The term **required allowances** is defined in *42 U.S.C. § 7651o* as follows -

> 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 83-ENERGY EXTENSION SERVICE > SUBCHAPTER IV&ndash;A-ACID DEPOSITION CONTROL**

