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TANSTAAFL: The ESCO Energy Optimization Process at 4 WWTPS

Washington Suburban Sanitary Commission (WSSC)
Laurel, Maryland

The Washington Suburban Sanitary Commission (WSSC) serves 1.8 million residents with water
and wastewater service with 2 surface water treatment facilities and 5 wastewater treatment
plants. In an effort to reduce operating costs and encourage sustainable practices the
Commission entered into a series of agreements with an Energy Services Company (ESCO) to
perform Energy Performing Contracts (EPCs). These alternative delivery projects involved theCost
Commission conducting upgrades to water and wastewater treatment facilities based on
guarantees of reduced operating expenditures.
In this project delivery and financing method, the ESCO in conjunction with the Commission
and the owners engineer conducted preliminary evaluations of treatment processes in an effort to
identify opportunities for reduction in operating expenses (power consumption, demand
management, solids disposal and fuel usage, based on a 15 year payback period. Upon
agreement between the owner and the ESCO as to the process improvement, construction cost
and reduction in operating costs, the owner and ESCO entered in an agreement whereby the
ESCO designed and constructed the improvement (under a modified design-build process) and
the ESCO guaranteed the projected operations savings for a 15 year period.
The first series of project involved the expenditure of $10.2 M in construction and design cost
with a guaranteed annual savings of $700,000 per year. In the first two years of operation, these
projects have saved $1,500,000 per year. While these figures indicate that the Commission has
been able to have its cake and eat it too, “There ain’t no such thing as a free lunch”
(TANSTAFL)”. The process and implementation of these projects demonstrated a number of
lessons to the Commission in how to conduct the initial evaluation, design, construction and
verification of energy savings. This paper will detail the challenges and lessons learned from the
ESCO process and demonstrate the path to success for future ESCO projects.
The process demonstrated the importance of well defined and consistent design standard,
particularly for instrumentation and control, electrical and HVAC systems. The Commission
was challenged with developing and writing appropriate contractual terms at the preliminary
design stage, as that is stage at which the project cost is established and requirements for
equipment are developed. In addition, the Commission was challenged with balancing the
desires and requirements of multiple groups including operations, engineering, finance, and
power management. The paper will present examples of each of the challenges, along with solutions to the challenges that allow the Commission to continue with this project delivery
method with greater success.


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Posted: May 20th, 2011 | Filed under: >1M, Sanitary Sewer, Stormwater, Waste Water Treatment, Water Treatment | Tags: , , , , , , , , | No Comments »

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