Executive Summary (Excerpt)
By dividing the estimated number of incidents by the number of turbines and by 1.65 MW per turbine searched in each period, a rate of incidents/turbine and incidents/Megawatt was calculated for the study duration. Because we used three different search periods to calculate incidents/MW, we calculated three different fatality estimates for birds and bats.
The estimates for birds are:
1-Day (Total season 152 days): 1151 incidents/season, 5.81 incidents/Mw/season, 9.59 incidents/turbine/season and 0.0053 incidents/MWh (Megawatt-hour) produced/season.
3-Day (Total season 138 days): 536 incidents/season, 2.71 incidents/Mw/season, 4.47 incidents/turbine/season, and 0.0027 incidents/MWh produced/season.
7-Day (Total season 125 days): 376 incidents/season, 1.90 incidents/Mw/season, 3.13 incidents/turbine and 0.0020 incidents/MWh produced/season.
The estimates for bats are:
1-Day (Total season 152 days): 2943 incidents/season, 14.87 incidents/Mw/season, 24.53 incidents/turbine/season and 0.0134 incidents/MWh produced/season.
3-Day (Total season 138 days): 2680 incidents/season, 13.54 incidents/Mw/season, 22.34 ncidents/turbine/season and 0.0133 incidents/MWh produced/season.
7-Day (Total season 125 days): 1824 incidents/season, 9.21 incidents/Mw/season, 15.20 incidents/turbine/season and 0.0099 incidents/MWh produced/season.
The most accurate counts are reflected in the 1-Day numbers for the 120 turbines and should be referenced when evaluating impacts on the full build-out of 195 turbines. In a full-build-out scenario with 195 turbines, the estimated number of incidents for the season (fall migration) is below. IWA estimates an ANNUAL number of incidents at the site to be around 10,000.
Birds - 1870 incidents
Bats - 4783 incidents