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About the Load Duration Report

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This report is used to specify how long the demand (or consumption) for a point, aggregate point, or group of points exceeds a specified level. The reason you would use this report would be to see how much time your peak demand levels are maintained. Since demand is a large component of the typical electric rate, you may be able to find significant savings by lowering your peak demand. The date range is user definable, and the benchmark, or baseline, to be compared against is based on historical data within the data point log itself. For comparison purposes, you can also have the software “normalize” the load data based on outside air temperature or based on floor area.

This report, when used with the exception report and the What-If Analyzer, helps to identify return on investment.

Figure 4-18 Load Duration Report Example.

Creating a Load Duration Report.

To create a Load Duration Report, perform the following tasks:

• Start the Load Duration Report
• Set Report Parameters

Start the Load Duration Report

1. Select the Load Duration link on the shortBrandName home page or use the Goto list from within a current report screen. The Load Duration report opens.
2. Select All Sites from the Site Selector list. Click to expand the Atlanta node and click to expand the Electric-Main meter. Consumption and demand nodes are displayed under the Electric-Main meter.
3. Right-click the “demand” icon and select Add to Report. The Atlanta: Electric-Main meter is added to the report.

Set Report Parameters

1. Under Load Duration field, do the following:
   • for Interval, select the hours option.
   • for # Plotted Points, type in “100”.
2. For Period, select Last Month
3. Do not display a baseline and do not select normalization options.
4. For the Baseline, choose 1 month prior.
5. Click on Run Report to create the Load Duration Report.

   The load duration report, Figure 4-19, shows the number of hours in the month (744) along the x-axis. The highlighted row in the table shows that the demand for the month exceeded 918 kW for only 9.5 hours out of 744 total hours. Knowing that the demand charge for this particular meter is $10.69 (as an example) the energy manager determines that some basic demand limiting sequences that keep demand under 918 kW would reduce peak by 98 kW and save $1,047.62 per month. Depending on the demand charges in the rate, investment in an on site generator may be justified as a cost savings measure.

Figure 4-19 Load Duration Report Sample Exercise