Energy Star compliance?

In 1992, the EPA provided Energy Star, a voluntary labeling program, designed to promote and recognize energy-efficiency in monitors, climate control equipment, and other technologies. This resulted in, among other things, the widespread adoption of sleep mode among consumer electronics. The term Green Computing was probably invented shortly after the Energy Star program began, and generally referred to power consumption-related issues. There are several USENET posts dating back to 1992 which use the term in this manner.