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WaterOperator.org Blog

Articles in support of small community water and wastewater operators.

Energy Efficiency in Action

Energy Efficiency in Action
Small systems across the country are challenged to raise revenue in order to pay for the infrastructure and water treatment upgrades necessary to meet stricter water quality regulations. However, what if this revenue shortcoming could be made-up over time within a utility itself, sometimes without raising rates? Implementing an energy audit and then applying cost-efficient energy-saving strategies may be just the ticket.

An audit or self-assessment can help staff understand how their utility uses energy as well as the impact energy-intensive processes such as pumping and aeration has on overall usage. The EPA offers a range of tools available to help with this process, including an energy use assessment spreadsheet tool.

Once an audit is complete, utilities can develop a program to reduce energy costs. RCAP suggests focusing on these five areas: benchmarking, lighting systems, HVAC systems, pump efficiency and wastewater treatment. According to Ohio RCAP, potential energy-cost reductions can range from 6 to 62 percent, with an average of less than a 1-year simple payback for communities that are actively using energy audits and energy-reduction programs. 

It is always inspiring to learn about energy-saving strategies used by other systems. The wastewater plant in Copperas Cove, Texas, for example, installed new energy-efficient blowers, a modern aeration control scheme, finer screening at the headworks and a maintenance-friendly air diffusion system in order to cut their energy costs. Since their improvements, total average monthly energy costs at the plant have dropped by nearly 25%—from $22,000 per month to $16,000.

And this video shows how a utility in Evansville, IN was able to upgrade its wastewater plant without raising rates. In addition, the city became the first in the country to generate clean energy using FOG, or fats, oils and grease. 

A good way to brush up on how to operate efficient small utilities is by reviewing RCAPs planning and resource guide or the EPA's Strategies for Saving Energy at Public Water Systems or Florida Rural Water's Energy Reduction Techniques for Small and Medium Systems. In addition, this handbook from South Dakota DENR guides small systems step-by-step through the auditing process and explains how to develop an energy conservation program, identify and implement energy conservation measures (ECMs), and monitor the progress and success of the implementation program.

Featured Video: Energy Efficiency at Wastewater Treatment Facilities

Featured Video: Energy Efficiency at Wastewater Treatment Facilities
As winter gets underway, many of communities are thinking about energy costs and energy savings. Utilities will recognize these concerns as well. Did you know 30-40% of a municipality's energy budget is spent on the treatment of drinking water and wastewater? Chances are someone at your utility has been made aware. With energy costs rising everywhere, it doesn't hurt to save money where you can and perform an energy audit at your utility.

This 7-and-a-half minute video from the Rural Community Assistance Partnership (RCAP) doesn't go into the details of a full energy audit. But it does outline several areas where energy audits often find opportunities for savings. It can be a great way to introduce water boards, mayors, and other decision-makers to the benefits of energy audits. And even without being a full audit, it might give you some good ideas for your utility. Though the video highlights wastewater treatment facilities, most of the tips could be easily applied to drinking water utilities as well.

Energy Efficiency at Wastewater Treatment Facilities from RCAP on Vimeo.

If you're interested in getting an energy audit for your utility, RCAP staff are able to carry out energy audits for both water and wastewater utilities. To find the RCAP partner that serves your region, check their website.