### Question
How is the "new unit" defined?


### Answer
The term **new unit** is defined in *42 U.S.C. § 7651a* as follows -

> a unit that commences commercial operation on or after November 15, 1990

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

