Whoever knowingly and willfully damages or attempts or conspires to damage the property of an energy facility in an amount that in fact exceeds or would if the attempted offense had been completed, or if the object of the conspiracy had been achieved, have exceeded $100,000, or damages or attempts or conspires to damage the property of an energy facility in any amount and causes or attempts or conspires to cause a significant interruption or impairment of a function of an energy facility, shall be punishable by a fine under this title or imprisonment for not more than 20 years, or both.