This document discusses power quality audits and harmonics. It provides an overview of Felidae Systems, an engineering consultancy company that offers energy management services including power quality audits. It then defines harmonics as distorted currents caused by non-linear loads like variable frequency drives and UPS systems that can overload transformers and cause equipment damage. The document lists some common effects of harmonics like voltage fluctuations, equipment damage, and increased temperatures. It recommends detecting harmonics and their levels to identify potential problems in electrical systems.