Pumps and Power: System Optimization
Pumping is almost always the single largest line item on a water or wastewater utility's electric bill — and a mid-level operator is expected to do more than just calculate horsepower on paper: you need to translate that horsepower into dollars, and understand how changing a pump's operating speed ripples through flow, head, and power together. This guide covers overall wire-to-water efficiency, energy cost calculations, and the pump affinity laws — the three tools you need to evaluate real operational decisions like whether to run one pump longer or two pumps shorter, or whether slowing a variable-frequency drive (VFD) down actually saves the money operators assume it does.
Overall (Wire-to-Water) Efficiency
The Process Control Basics guide walked the power chain from WHP through pump efficiency to BHP, then through motor efficien