Wind Resource Summary for Holyoke Site Final Report Colorado Anemometer Loan Program Monitoring Period:: 6/21/26 /6/27 Report Date: December 2, 27 Site Description: The site is 17.4 miles south of the town of Holyoke, Colorado, and it is east of U.S. Highway 35. The terrain is relatively flat, with less than feet of relief over a mile. The tower is located in pasture, but cropland can be found immediately north of the site. A farmstead is located about 1, feet north-northeast of the site. LOCATION DETAILS Latitude: N 4 2' 5" Longitude: W 2 15' 33" Township: 4 N Range: 44 W Section: 11 Elevation (ft.): 3,776 Tower Type: NRG Tilt-Up Tower Height (ft.): 9 Tower Height (m): 3 Vane Offset (deg): 45 Direction Basis: Mag. North Mag. Declination: 7.925 E Report Prepared By: Michael Kostrzewa, P.E. Colorado State University Department of Mech. Eng. Campus Delivery 1374 Fort Collins, CO 523-1374 (97) 491-779 michael@engr.colostate.edu Tower Site Report Date: /2/27
Wind Resource Summary All analysis performed using Windographer 1.13 Data Properties Data Set Starts: 6/21/26 : Data Set Ends: /2/27 7: Data Set Duration: 15.5 months Length of Time Step: minutes Elevation (ft.): 3,776 Calm threshold (mph): Wind Power Coefficients Power Density at 5m: 21 W/m 2 Wind Power Class: 2 (Marginal) Wind Power Coefficients Power Law Exponent:. Surface Roughness:.1 m Roughness Class:.7 Roughness Description: Rough Pasture Note: Air temperature was not factored into wind calculations Wind Speed Variable at 3m Height above ground (m) 3 Mean wind speed (mph) 13.64 Median wind speed (mph).92 Min wind speed (mph) Max wind speed (mph) 5.7 Mean power density (W/m²) 227 Mean energy content (kwh/m²/yr) 1,99 Energy pattern factor 1.3 Weibull k 2.97 Weibull c (mph) 15.36 1-hr autocorrelation coefficient.25 Diurnal pattern strength.62 Hour of peak wind speed 15 Mean turbulence intensity.4 Standard deviation (mph) 6.76 Coefficient of variation (%) 49.6 Frequency of calms (%).45 Actual observations 67,934 Missing observations 76 Data completeness (%) 99.9 Wind Resource Statistics Hour of Day Average Wind speed mph.5 13.45 1.5 13.6 2.5.794 3.5.9 4.5.717 5.5.45 6.5.562 7.5.93.5 13.573 9.5.135.5.219 11.5.543.5.5 13.5.69.5.62 15.5.553.5.43 17.5 13.715 1.5 13.513 19.5 13.547 2.5 13.7 21.5 13.753 22.5 13.475 23.5 13.52 Direction Sector Midpoint degrees Frequency percent 7.6515 2 6.655 3 4 5 6.561 6 7 4.6369 9 3.4239 1 4.2527 13 3.979 15 5.9999 17 1.43 19 2.95 2 22 23 9.372 24 25 4.47 26 27 3.211 2 29 4.4 3 3 32 6.515 33 34 7.226 35
2 Seasonal Wind Speed Profile Average Wind Speed (mph) 15 5 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Wind Shear Profile Log law fit Power law fit Measured data Height Above Ground (m) 6 4 2 5 15 2 Av erage Wind Speed (mph)
Daily Wind Speed Profile Total For Measurement Period Average Daily Profile Average wind speed (mph) 4 6 1 24 Hour of Day Wind Direction For Total Measurement Period Wind Frequency Rose 35 % calm 34 2 33 3 32 4 3 5 3 6 29 7 2 27 9 26 25 5% 1 24 23 % 13 22 2 15% 15 2 19 1 17
1 Jan Hourly Wind Speed By Month 1 Feb 1 Mar 6 1 24 6 1 24 6 1 24 1 Apr 1 May 1 Jun 6 1 24 6 1 24 6 1 24 1 Jul 1 Aug 1 Sep 6 1 24 6 1 24 6 1 24 1 Oct 1 Nov 1 Dec 6 1 24 6 1 24 6 1 24
Wind Direction By Month (All Years) Dec 3 6 9 15 1 2 24 27 3 33 % calm % % Nov 3 6 9 15 1 2 24 27 3 33 % calm % % Oct 3 6 9 15 1 2 24 27 3 33 % % Sep 3 6 9 15 1 2 24 27 3 33 % calm % % Aug 3 6 9 15 1 2 24 27 3 33 % calm % % Jul 3 6 9 15 1 2 24 27 3 33 % calm % % Jul 3 6 9 15 1 2 24 27 3 33 % calm % % May 3 6 9 15 1 2 24 27 3 33 % % Apr 3 6 9 15 1 2 24 27 3 33 % % Mar 3 6 9 15 1 2 24 27 3 33 % % Feb 3 6 9 15 1 2 24 27 3 33 2% calm % % Jan 3 6 9 15 1 2 24 27 3 33 % %
Box Plot for Wind Speed By Month 6 5 Monthly Statistics for WS3 max daily high mean daily low min 4 Value (mph) 3 2 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann Box Plot for Wind Direction By Month 36 33 3 Monthly Statistics for WD3 max daily high mean daily low min 27 24 2 Value ( ) 1 15 9 6 3 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Estimated Wind Turbine Performance The wind resource data from this site was compared against typical small wind turbines at 3m tower height to project the total energy production potential. The table below lists the turbines considered, the estimated turbine costs and the expected turbine performance: Hub Height Wind Speed mph Time At Zero Output percent Time At Rated Output percent Average Net Power Output kw Average Net Energy Output kw Average Net Capacity Factor kw Turbine Estimated Turbine Cost (w/o tower) Rotor Diameter meters Rotor Power kw Hub Height meters Bergey Excel- R/V $,56 6.7 7.5 3 13.64 15.11 4.31 1.76 15,45 23.5 Bergey Excel- S/6 $2,6 6.7 3 13.64 7.35 1.3 1.9,576 1.9 Bergey XL.1 $2,65 2.5 1 3 13.64 2.66 6.1.264 2,3 26.4 Southwest Skystream 3.7 Southwest Whisper 5 $,999 3.7 1. 3 13.64 13.6.495 4,337 27.5 $6,62 4.5 3 3 13.64 15.6 5.22.56 7,51 2.5 Note that the costs do not include the costs for the tower or labor for installation. These turbines are not recommended or endorsed. Landowners interested in installing a turbine are encouraged to contact a wind equipment dealer or a wind developer for design assistance and equipment recommendations. The costs shown above were obtained from publicly available costs on the Internet. For reference, the costs for these turbines were obtained from the following vendor: Earth Solar Group 6315 Canyon Dr. Amarillo, TX 791 1..329.323 http://www.earthsolar.com/