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Tuesday, 31 December 2019 / Published in Case Studies, Haynes News

Schneider Electric Case Study: City of Riverbank, CA

Municipal Wastewater Treatment Plant Achieves 75% Energy Savings using Innovative Engineering and Financing Plan

This is a case study for an Energy Savings Performance Contract (ESPC) at the wastewater treatment plant for the City of Riverbank in California. The existing plant has an average of 1.67 MGD flow and consists of the headworks, four treatment ponds, and seven percolation ponds. Prior to the project, the treatment ponds used surface aerators to provide oxygen for the biologic process. The plant was primarily operated manually with limited dissolved oxygen control. The utility bills showed excessive energy use – annual usage was 5,673 kWh/MG/yr. Schneider Electric and the City of Riverbank entered into a construction contract to retrofit the treatment ponds with blowers and fine-bubble diffusers for more efficient oxygen transfer. Additionally, a control system was installed to maintain a dissolved oxygen set point. This scope of work is estimated to save 75% of the electricity consumption at the wastewater treatment plant and will save the City 65% of their electric bill, or $240,129 per year. The energy and utility analysis was done by following a five-step process:

1. Benchmark baseline energy data
2. Analyze baseline utility data and model utility rates
3. Model baseline energy consumption
4. Model estimated energy consumption after the scope of work is installed
5. Determine estimated dollar savings associated with the scope of work

This case study outlines these processes and discusses the customized energy model that was developed for this analysis. Financial parameters of the project are discussed, including the city’s payback criteria, final project costs, and utility incentives. Finally, a discussion is presented on the benefits of using an ESPC for this type of project and why the city chose to use this contracting method to accomplish their goals.

Download Full Case Study Here: Parkson Energy Savings case-study-city

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