HELIX Environmental Planning, Inc. (HELIX) is providing biological consulting services for the 14,820-acre Ocotillo wind energy project in Imperial Valley, California. The proposed project would be constructed to maintain a 561-megawatt wind-generation facility, including 244 potential turbine locations. Nearly the entire site is located in BLM-administered lands in the Imperial Valley. HELIX worked closely with local BLM staff and the BLM district office to develop biology survey protocols for the site that met state and federal agency requirements. HELIX provided support for anticipated wetland permitting. HELIX's survey work on the site included vegetation mapping, habitat assessments for listed and highly sensitive species, and focused surveys for rare plants, burrowing owl, flat-tailed horned lizard, and barefoot banded gecko. Avian work included conducting weekly avian point counts at 21 locations over a one-year period and conducting a fall and a spring avian migration count study. Bat survey work included a combination of passive, long-term monitoring using mounted Anabat sensors, and active surveys using a handheld Anabat and a thermal imaging camera.