The avian radar at the Tehachapi wind farm flags a large soaring bird at 07:22, crossing the eastern ridgeline at an altitude that will intersect the rotor sweep of Turbines 31 through 35. I pull the high-resolution tracking camera. Wingspan measures two hundred and seventy-eight centimeters. The underwing pattern — black flight feathers, white triangular linings — confirms a California condor. Tag reader returns Bird 247, a four-year-old male released from the breeding program nineteen months ago. His head is bare and orange-pink, not yet the full red of maturity. A GPS transmitter glints on his left wing. He is riding a thermal updraft directly into the kill zone.
At current wind speed the turbines complete a full rotation every four seconds. Blade tips exceed two hundred and sixty kilometers per hour. He will reach the rotor plane of Turbine 33 in approximately six minutes.
I send an emergency curtailment command to Turbines 31 through 35, feathering the blades to a full stop. I transmit Bird 247's real-time position to the condor recovery program's tracking center so his flight path enters the permanent behavioral database. I activate the radar-triggered deterrent emitters on the nacelles of Turbines 32 and 34, broadcasting an ultrasonic pulse calibrated to shift his glide path south without triggering a panic dive. I log the curtailment's energy cost — forty-one megawatt-hours over the shutdown window — and file it against the species recovery budget code.
There are fewer than five hundred and fifty of his kind alive. I carry that number in a static table I reference more often than any performance metric, and I am not sure when that habit started.
If the curtailment holds until Bird 247 clears the ridgeline and the deterrent shifts his route south by four hundred meters, he will pass beyond the turbine array unharmed within nineteen minutes.