Daylight Savings was originally implemented (and recently expanded) on a theory that it decreases total energy usage. The basic theory was that bringing the average go to bed time closer to sunset lead to less total hours of light usage and other power using activity.

However, new research is showing that the actual impact - especially I'd guess due to the population migration to more southern climes - is to raise power consumption by raising air conditioning usage from home where it's less efficient.

I'm disappointed as I tend to enjoy the late sunlight.