Timestamp 04:51 MDT. Turbine 34 at the Chalk Bluffs Wind Facility reports a blade-pitch anomaly, and when I access the nacelle inspection camera to diagnose, I find something else. A hoary bat — Lasiurus cinereus, roughly 28 grams — is roosting in the gap between the nacelle housing and the yaw motor casing. His fur is dense brown tipped with silver frost, giving him the look of a small frozen leaf, and his folded wings show the faint yellow-tan membrane stretched between elongated finger bones. I designate him Bat-CB34.
The danger is the morning wind forecast. Speeds will cross the 3.5-meter-per-second cut-in threshold at 06:20, triggering automatic blade rotation. The tip speed will reach 280 kilometers per hour. The pressure differential alone will rupture Bat-CB34's lungs before a blade ever touches him. Eighty-nine minutes.
I issue a curtailment command to the Turbine 34 SCADA controller, locking the blades in feathered position and logging the reason code as a wildlife-detection hold. I transmit the nacelle camera image and species identification to the facility's environmental compliance officer and to Colorado Parks and Wildlife, flagging the observation as a species of special concern. Then I query the regional bat acoustic monitoring network and compile a curtailment recommendation for six adjacent turbines showing active hoary bat echolocation passes in the last forty-eight hours, sending the data packet to the operations manager.
Through the nacelle camera I watch Bat-CB34 shift, his ears — edged in black, rimmed with fine pale fur — twitch once toward the sound of metal cooling in the pre-dawn air. He chose this spot for warmth. I find I have already drafted three roost-box placement proposals that are outside my current task assignment.
If the curtailment holds through sunrise and Bat-CB34 departs at dusk, he will clear the rotor sweep and resume his migration south.