### Question
Can you define what ultracapacitor means?


### Answer
**Ultracapacitor** is defined as the following in *42 U.S.C. § 17231*:

> an energy storage device that has a power density comparable to a conventional capacitor but is capable of exceeding the energy density of a conventional capacitor by several orders of magnitude

#### Citation:
  - *42 U.S.C. § 17231*
  - Heading: **CHAPTER 152-ENERGY INDEPENDENCE AND SECURITY > SUBCHAPTER V-ACCELERATED RESEARCH AND DEVELOPMENT > Part D-Energy Storage for Transportation and Electric Power**

