PROGRAM INFORMATION

Summit County SCRAP- 7/28/2008 through 4/13/2010

DATA DETAILS

July 28, 2008 through April 13, 2010:

The anemometer tower was installed on July 28, 2008 by Innovative Energy at the Summit county landfill. The tower was removed on April 13, 2010. The landill is just east of Dillon Reservoir. The surrounding terrain can be described as hilly with a surface roughness similar to a rough pasture, though the landill sits in a valley that runs NW/SE until it opens up to the west onto Dillon Reservoir.

Wind data is collected using two (2) NRG #40 Anemometers and one (1) NRG #200P Wind Vane, as follows:

• Anemometers
  1. 30 meters facing East
  2. 30 meter s facing West
• Wind Vane
  1. 30 meters facing 320° (with null point facing out)

There is also a temperature sensor at a height of about 5 meters.

All sensors feed into an NRG Symphonie data logger. The data logger generates wind reports for each day and writes the data to a memory card. This card is periodically replaced by Innovative Energy and the daily data files are sent to the Colorado ALP at Colorado State University for analysis. Using the Symphonie Data Retriever software, each day's data is complied into one large data file. A zipped file that contains all of the NRG data files and a text version of the aggregate data for all days are given below (these are large files).

It is important to note that these are the raw files without any compensation for offset. Also, note that no data is available for the period from 9/15/2008 through 10/13/2008.

Using this data, an analysis of the wind resource report was developed using Windographer 1.45. For this data an offset of +320° was applied to the wind vane data. For this report, a data quality analysis was performed on the data. This data was filtered two ways:

1. Any wind speed data (from either wind speed sensor) where the wind speed was less than 1 mph at a temperature less than 35°F for 3 hours or more was deleted.
2. Any wind direction data where the wind direction varied by less than 3 degrees over 3 hours at a temperature less than 35°F for 3 hours or more was deleted.

Windographer was then used to add in synthetic data to these intervals with suspect data. The summary report, the combined data files (with and without the data quality analysis), and the Windographer files (with and without the data quality analysis) and wind resource summary report are given below:

• Summit_SCRAP_4711_2008_0728_to_2010_0413_Summary_Report.pdf
• Summit_SCRAP_4711_2008_0728_to_2010_0413_without_data_validation.windog
• Summit_SCRAP_4711_2008_0728_to_2010_0413_without_data_validation.txt
• Summit_SCRAP_4711_2008_0728_to_2010_0413_with_data_validation_offset_320.windog
• Summit_SCRAP_4711_2008_0728_to_2010_0413_with_data_validation_offset_320.txt

Final Wind Resource Summary

The anemometer tower was removed from the site on April 13, 2010. Highlights of the wind resource at this site for the entire monitoring period are shown below:

Windographer was used to match up the wind at this site with the performance curves of some common turbines of various sizes and various heights. The table below shows the results. For the larger turbines, the tower height was increased to account for the larger turbine blades - the wind resource was extrapolated to these higher heights. Keep in mind that the larger and the higher the turbine, the better the wind and the greater the output. But of course, as the tower heights and turbine sizes increase so does the cost.

IMPORTANT: No turbine losses are included in the power, energy, and capacity factor values in the table. Typically, turbine losses can be 5-20% to account for maintenance downtime, icing/soiling and losses from other turbines in a wind farm. Users wanting to be conservative in the performance projections should multiply the power, energy, and capacity values by (1- % losses) to account for these losses.

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