I have never figured out how this is possible in the central valley of California. Temperature regularly peak above 100 in the summer months. High temperatures usually peak around 4:00 PM PDT, so everyone leaving work to crank up their home air-conditioners at the time of peak temperatures cannot possible save energy. We are continually being told to use less energy during this time period.
Add to this California's requirement that more battery operated cars be sold. What happens when everyone plugs in their car as they get home?
I have always thought that daylight saving time's energy savings is a liberal myth. The government mandated change in my sleep time is an intrusion into my private life that I do not appreciate. It takes me weeks to be able to fall asleep earlier, and keeps me from being as productive during the day because of sleep deprivation.
Why do I need more daylight at night? It already stays light until 9:00 in mid-summer without daylight savings time.