Visit windpowermonthlyevents.com for the latest on our upcoming conferences and webcasts

United States

United States

Raising wind turbine cut-in speeds lowers bat fatalities, finds study

US: The study by the Bats and Wind Energy Cooperative (BWEC) found that raising wind turbine cut-in speeds - the wind speed at which turbines start producing electricity - reduced bat fatalities by an average of 72 to 82%.

Raising cut-in speeds would lower bat fatalities by up to 53%
Raising cut-in speeds would lower bat fatalities by up to 53%

In the study, scientists raised cut-in speeds on 12 out of 23 turbines at Iberdrola's 34.5MW Casselman Wind Project in Pennsylvania.

The researchers found no statistical difference between cut-in speeds of 5 and 6.5 metres per second (from a base of about 4 m/s).

Ed Arnett of BWEC and Bat Conservation International said that if the curtailment were applied to the entire farm, it would result in a 0.3% loss in annual output using the 5 m/s cut-in speed, and a 1% loss in annual output using the 6.5 m/s cut-in speed.

Arnett also revealed the preliminary results of a second BWEC study with Iberdrola, this time using devices that produce ultrasonic waves.

The study at Pennsylvania's Locust Ridge wind farm found that these deterrent devices have a much weaker effect than curtailment.

The deterrents reduced bat kills by 20% to 53%, and cost about $20,000 a turbine. Arnett warned that the researchers have not developed a device ready for commercial deployment.

Engineers are designing a fifth-generation prototype that BCI will use for further tests at Locust Ridge this summer.

 

Before commenting please read our rules for commenting on articles.

If you see a comment you find offensive, you can flag it as inappropriate. In the top right-hand corner of an individual comment, you will see 'flag as inappropriate'. Clicking this prompts us to review the comment. For further information see our rules for commenting on articles.

comments powered by Disqus
Only [DAYS_LEFT] days Subscribe Now

Left of your Windpower Monthly free trial

Your free trial Subscribe Now

to Windpower Monthly has expired

Windpower Monthly Events

Search more than 4,500 companies in the Windpower Directory

Latest Jobs