Standards: ANSI/ASHRAE/IES 90.1-2022 + ANSI/ASHRAE 211-2018
Applied to process facilities and building systems respectively.

 

Energy is typically the largest controllable operating cost for a water or wastewater utility — often 30 to 40 percent of total operating expenditure. Unlike labor or chemical costs, energy cost is highly recoverable through operational changes and targeted capital investment. The savings are measurable, the payback periods are short, and the financial case is quantifiable and actionable.

Coriho Energy conducts structured energy assessments for water and wastewater facilities, applying ASHRAE Standard 211 for building systems and ASHRAE/IES Standard 90.1 for the broader facility. We calculate Specific Energy Consumption (SEC) for your primary unit processes — pumping, aeration, treatment — benchmark against comparable utilities and identify where the largest recoverable savings are.

 

Our assessments cover energy systems and operating costs. Process engineering, chemical dosing, and regulatory compliance services are outside the scope of this engagement.

 

Assessment levels

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Level 1 — Walk-Through Assessment.
Utility bill and interval data review. Site walkthrough of pumping systems, aeration equipment, electrical infrastructure, and building loads. SEC calculation and peer benchmarking. Identification of the highest-priority Energy Efficiency Measures.

 

Level 2 — Energy Survey and Analysis.   
Detailed engineering analysis of major process systems. Pump efficiency curves versus actual operating points. Aeration system dissolved oxygen control review. VFD opportunity assessment. Blower system controls review where applicable. Full financial analysis — avoided cost, capital cost, simple payback — for each EEM.

 

What you receive

1) Specific Energy Consumption (SEC) benchmarking against comparable utilities.

2) Utility bill analysis covering a minimum of 12 months of interval data.

3) Prioritized Energy Efficiency Measures (EEM) with estimated savings and simple payback.

4) Level 2 includes detailed system-level engineering calculations and financial analysis to support your internal capital planning process.

5)Findings framed around your operational reality — treatment capacity, regulatory constraints, staffing, and capital cycle.

6) Written report reviewed by a licensed Professional Engineer.

 

You leave with a clear picture of where your energy dollar goes, what it costs to recover it, and a technically grounded basis for your internal energy cost reduction decisions — reviewed by a licensed P.E.

 

Engagements are scoped before they begin. You will know what the assessment covers, what it costs, and what you will receive — before we start.