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Everything you need to know about Daylight-Saving Time.  Including how much money it saves.  From Wired Science.

What Is Daylight-Saving Time? | Wired Science | Wired.com

Time for another crazy estimation. Let’s start with a U.S. population of 300 million. But it isn’t the population that matters; it is the number of light bulbs that would be turned off because of DLS (Daylight Saving). Let me just guess that there are 100 million households and on average, each household turns off two lights because they are sleeping with a power consumption of 100 watts. This is tough since some people still have the lights on even if it isn’t dark outside – later in the afternoon it is still dark enough that lights might be needed. 
So, in one day during DLS, I have 100 million households using 100 watts less than they normally do for one hour. Since power is the change in energy over time, this means that the energy saved would be:Now let me assume an average price for energy at $0.1 per kilowatt*hour. Of course, this price varies with location. This would put the cost savings per day at $10 million dollars. If DLS is 200 days (I think it is actually 238), this would put a total yearly savings of $2 billion. That is compared to a gross domestic product of 14 trillion dollars for the USA.

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