When Pima County’s Tres Rios Water Reclamation Facility added new biogas cleaning and utilization equipment, the system had to be protected, metered, studied for arc-flash safety, and folded into the plant’s control network. Supporting The Ashton Company, CEI designed an NFPA 780 lightning protection system, added power-quality metering, and modeled the expanded electrical system to deliver device evaluation, protective-device coordination, and an arc-flash study per IEEE 1584. CEI then programmed the new control panels into the plant’s PLC/SCADA and procured them with a factory acceptance test, bringing the additions online with tested controls and current safety analysis.