For many commercial homeowners associations (HOAs) and property managers, the math of going solar is incredibly appealing right up until it collides with the physical reality of the building envelope. Installing a 25-year solar array on a roof with less than a decade of remaining service life creates a looming, expensive financial liability because operators must eventually pay to strip the solar panels, replace the roof, and re-install the system midway through the power contract.
The Foothill Medical Center Association in Foothill Ranch, California, bypassed this dilemma entirely. By utilizing a creative financing structure, the non-profit commercial HOA successfully energized a 300 kW rooftop and carport solar system alongside a full roof reconditioning, all delivered with zero upfront capital expenditure.
Navigating the C&I messy middle
Commercial and industrial (C&I) projects in the sub-megawatt range are notorious for high friction. Developers often find themselves navigating a labyrinth of site-specific physical constraints, complex utility tariffs, and legal hurdles that keep viable projects grounded in the underserved middle of the market.
For the Foothill Medical Center, the primary hurdles were structural and organizational. First, multiple solar-supporting roofs on the medical campus were nearing the end of their useful lives. Second, as a non-profit HOA, the association wanted to avoid levying expensive special assessments on its members or draining its capital reserve funds to pay for a new roof and solar array.
To make the project pencil out, developer WattHub Renewables structured a Power Purchase Agreement (PPA) funded by Sunrock Distributed Generation. The economics of the energy production were optimized to absorb the cost of the comprehensive roof reconditioning directly into the PPA.
Technical and construction alignment
Coordinating two distinct trades (commercial roofing and solar EPC) under a single construction campaign is critical to protecting project margins and minimizing site disruption.
SunRenu Solar executed both scopes of work concurrently. Rather than subjecting the medical center to back-to-back construction phases, crews completed the roof reconditioning and the solar racking and carport installations in a single, streamlined sequence. This approach maintained a tight timeline and preserved building envelope integrity before the solar arrays were anchored.
The completed system combines traditional rooftop solar with carport canopies to maximize the property’s available solar footprint.
Structuring a zero-down commercial solution
The newly energized system at the Foothill Ranch medical campus features 300 kW of direct-current solar capacity spread across rooftop space and newly constructed parking carports. Funded through a zero-upfront-cost PPA by Sunrock Distributed Generation, the project avoided any special HOA assessments or reserve draws by bundling a full roof reconditioning directly into the power contract.
WattHub Renewables led the development of the combined project, which was constructed on a compressed schedule by general contractor SunRenu Solar. To monitor real-time system yields and maintain operational performance, the project partners deployed the Wattch energy monitoring platform.
Environmental and grid impact
Operating under Southern California Edison’s GS-2-TOU (General Service, Time-of-Use) tariff, the system is configured to optimize discharge and consumption patterns when utility rates are at their highest.
The 506,000 kWh of annual clean electricity generated by the combined arrays is projected to offset approximately 359 metric tons of carbon dioxide emissions per year. This carbon offset is equivalent to removing roughly 78 conventional, gasoline-powered passenger vehicles from Southern California roads annually.
With Permission to Operate (PTO) already secured and active commissioning underway, the project stands as a highly repeatable template for other commercial HOAs throughout the Southwest. It demonstrates that the long-term cash flows of a distributed solar asset can be leveraged to solve immediate, expensive deferred building maintenance challenges.
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