### Question
Can you define what new unit means?


### Answer
**New unit** is defined as the following in *42 U.S.C. § 7651a*:

> 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**

