### Question
How does SMART GRID define integrated energy system?


### Answer
Under *42 U.S.C. § 17387*, **integrated energy system** is defined as:

> a system composed of 2 or more co-located or jointly operated sub-systems of energy generation, energy storage, or other energy technologies

#### Citation:
  - *42 U.S.C. § 17387*
  - Heading: **CHAPTER 152-ENERGY INDEPENDENCE AND SECURITY > SUBCHAPTER IX-SMART GRID**

