Few topics are hotter than green technology. Some of the most common green applications include energy harvesting, wind and solar power generation, and LED lighting. All of these technologies are either power saving or power generating, and they result in a cleaner, more sustainable global environment. At the component level, there are many exciting developments. For example, microprocessors continue to be designed in increasingly lower-power process technologies and power supplies now achieve >90% efficiency across all load conditions. There are also some lesser-known technology achievements that improve green applications and contribute to power saving. This paper focuses on timing technologies and the clock features that effect power consumption and green applications.