Energy audits of water/wastewater treatment facilities are conducted with a goal to improve the efficiency of energy consumption by these facilities and to reduce or mitigate greenhouse gas emissions. Walden engineers analyze the process operations of the facilities to develop unique emission reduction strategies that maximize the emission reduction benefits for that facility. Significant savings in energy consumption can be achieved through the evaluation and upgrade of processes and equipment that primarily contribute to energy expenditure, such as pump stations, aeration systems and disinfection systems, as well as processes that have a secondary impact on energy expenditure, such as clarification/filtration units, coagulation/flocculation systems and HVAC units. Efficient energy expenditure translates to reduced wastage of electricity and substantial cost savings in the operations of these facilities.