This is what I thought.
Let us assume that the Sun sets at 6.00 PM in March. Mr. Raghav leaves his office at 6.00 PM, takes 1 hour to drive back home in his car. He keeps his car's headlights on while driving in the dusk per rules of DMV.
Thus Raghav spends energy for 1 hour.
Now Day Light Saving starts - it "makes" the Sun to set at 7.00 PM. Raghav still leaves the office at 6.00 PM ( That's the catch!). He drives back home in his own car in broad light of the day( or evening) without having to turn his car's headlights on.
Thus Raghav saves energy for 1 hour.
Now you may ask what happens when he drives to his office in the morning. He , anyway, does not use headlights in the morning.
Bottom line:
DST helps save energy for a small fraction of the day near sunset ( or sun rise in some cases)
Following note is a high fundoo theory; read at your own risk:
We follow two Times - A. Clock & B. Cycle based on sunset / sunrise. Some activities we do are mapped to Clock while some are mapped to Sunset / Sunrise.
e.g. Working in office from 9 AM to 6 PM is mapped to a clock while putting your headlights on while driving is indirectly mapped to avaialibilty of the Sun light. If we change the overlap between these two mapping we can re-map some activities to do them more efficiently and effectiviely.
Feel free to comment/argu.
