Analyzing Opportunities for PV Systems on the North Coast

Last spring, the North Coast Resource Partnership (NCRP) issued a call for applications from small water and wastewater service providers in disadvantaged communities to host demonstration projects. The goal was to identify projects that would serve to “beta-test” a small community resources toolkit, provide real engineering support to providers, and develop case studies to serve as examples for the North Coast region as a whole.

Technical assistance for the projects selected by the NCRP was led by GHD Inc. in Eureka, CA. SERC was subcontracted by GHD to complete a photovoltaic (PV) analysis for the Smith River Community Services District’s (SRCSD) water pumping facilities using methods that could be replicated as part of the small community resources toolkit.

The System Advisor Model (SAM), developed by the National Renewable Energy Research Laboratory, was selected because SAM is a free, robust, and well-supported analysis platform. Also, data collected with a Solar PathfinderTM during the site visits was easily imported into the SAM model to account for shading at the proposed array locations.

Internal view of one of the seven water pumping facilities owned and operated by the SRCSD that were analyzed for opportunities to install photovoltaic systems.

Internal view of one of the seven water pumping facilities owned and operated by the SRCSD that were analyzed for opportunities to install photovoltaic systems.

SERC engineers analyzed seven of the SRCSD facilities and found that if PV systems were implemented on an individual basis, the simple payback periods ranged from 8 to 12 years, given the current incentive and pricing landscape. If the systems were aggregated together, the simple payback period would be about nine years to install 64 kW DC of PV generating capacity that could meet approximately 70% of projected SRCSD electrical loads. As a result of this work, SERC recommended that the SAM model and the Solar PathfinderTM be incorporated into the NCRP Small Community Resource Toolkit.