Does the host have a low PUE rating for its data center?
PUE stands for power usage effectiveness and is the standard energy efficiency measure for data centres. It represents the proportion of energy powering servers compared to other systems such as cooling and lighting.
Ask your hosting provider for the PUE of their data centres and host your web services in data centres with the best available PUE ratings to help minimise energy consumption. A perfect PUE is 1.0, with lower scores representing better energy efficiency.