"Although an early goal of DST was to reduce evening usage of incandescent lighting, formerly a primary use of electricity, modern heating and cooling usage patterns differ greatly, and research about how DST currently affects energy use is limited or contradictory". (Wikipedia).Traffic accidents increase (8%) and heart attacks (10%) when DST starts in the spring.
A time zone is roughly "one hour across" which means, in British Columbia, Cranbrook's sun is up half an hour before Vancouver and Prince Rupert's is up half an hour after Vancouver. If there really was a benefit, only the people in the middle would get much of it.
Bye bye PDST. Hello PT.
(A comedy of errors in our household. We put the battery clocks back a day early while the computer clocks are biding their time).