From today's NY Times, an article in the Business Section about price discrimination for electricity, which fluctuate hourly based on differences in demand:
"Just as cellphone customers delay personal calls until they become free at night and on weekends, and just as millions of people fly at less popular times because air fares are lower, people who know the price of electricity at any given moment can cut back when prices are high and use more when prices are low.
Most people are not aware that electricity prices fluctuate widely throughout the day, let alone exactly how much they pay at the moment they flip a switch. But participants in a new program can check a Web site that tells them, hour by hour, how much their electricity costs; they get e-mail alerts when the price is set to rise above 20 cents a kilowatt-hour."
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