### Question
How is the "renewable energy system" defined?


### Answer
The term **renewable energy system** is defined in *15 U.S.C. § 638* as follows -

> a system of energy derived from—


(i) a wind, solar, biomass (including biodiesel), or geothermal source

#### Citation:
  - *15 U.S.C. § 638*
  - Heading: **CHAPTER 14A-AID TO SMALL BUSINESS**

