### Question
How does the law define insolation?


### Answer
Under *42 U.S.C. § 5552*, **insolation** is defined as:

> the rate at which solar energy is received at the surface of the Earth

#### Citation:
  - *42 U.S.C. § 5552*
  - Heading: **CHAPTER 71-SOLAR ENERGY > SUBCHAPTER II-RESEARCH, DEVELOPMENT, AND DEMONSTRATION**

