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Electricity and Time of Use Pricing

Are you looking for the older version of this applet? We replaced the Java version of this applet with a modern Javascript alternative that is compatible with modern browsers in September 2017. If you're looking for the old version, which will only work in browsers like Safari and Internet Explorer, you can find it at the legacy applet page.

Many electricity providers offer their customers time sensitive, or time of use, pricing plans. These plans reflect the actual cost of producing electricity at the time it is needed. They are designed to encourage customers to lower their electricity use during times when the cost of producing electricity is high. People and businesses use varying amounts of electricity throughout the day and power utilities adjust to these changing demands. When demand is low, utilities can supply electricity using less expensive sources, but when demand is high more expensive sources must be added to supply enough electricity.

  1. Select pricing plan Hourly Plan - Summer and notice the graph showing Current Time and Current Price. What is the lowest price and during what times of day does it occur? Change the pricing plan to Hourly Plan - Winter. Now, what is the lowest price and when does it occur?
  2. Set the switches so that only the solar module is connected. (You can find the solar module in the Household Appliances menu. Use the scroll bar to see it.) Reset the time and watch for 24 hours. What happens? How does the time of day affect the production of the solar module? Under which pricing plan does the solar module save the home consumer most money? What happens when the solar module and the PC are the only connected appliances?
  3. If your Playstation 3 and 42" Plasma TV are on for four hours starting at 7:00 PM on a summer evening, how much do you pay for the energy used using the Hourly Plan? How much under the Three Tiered Plan?
  4. Your utility offers a Three-Tiered Plan. During what times should you avoid using the clothes washer during the summer? During the winter?
  5. Your utility offers an Hourly Plan. How much do you pay for energy if you use your clothes washer on a winter weekday from 8:00 AM to 10:00 AM compared with using it from 7:00 PM to 9:00 PM? If you wash clothes three times per week, how much could you save during one year by changing your washing time from night to morning?
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