June 16, 2010 -- The first day of the new iPhone pre-orders overwhelmed Apple and AT&T. Websites for both companies slowed to a crawl Tuesday, with some people receiving error messages when they tried to buy the iPhone 4. Many of the problems appeared to crop up when the sites tried to retrieve AT&T customer data. But the slowdown didn't seem to matter. On Wednesday morning, AT&T said it had stopped taking orders and was focusing on fulfilling orders already received. At midday Wednesday, the Associated Press reported that Apple was accepting orders for black models and would guarantee shipment by July 2. The white model was no longer available for pre-order.
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"You can have all of your data accessible online and you'll be able to look at that data and tell what you can cut back on what time of day might be better for using a particular device. When you can use something in your neighborhood (at off-peak hours) rather than using when everyone else is using it," Boehret said. For more saving-energy tips, you can read her column on the Wall Street Journal website .