Solar for K-12 Schools: What San Diego School Districts and Private Schools Need to Know Before Going Solar

Ownership vs. PPA: The Decision That Shapes Everything Else

The most consequential decision in a school solar project is whether the institution will own the system outright or enter into a Power Purchase Agreement or lease with a third-party developer. Each structure has different implications for long-term cost, balance sheet treatment, maintenance responsibility, and incentive capture.

Under a PPA, the developer owns the system and sells electricity to the school at a contracted rate, typically for 20 to 25 years. The school avoids upfront capital outlay and maintenance responsibility, but it does not own the asset and does not directly capture the federal Investment Tax Credit. Under an ownership model — financed through C-PACE, a bond, a lease-to-own structure, or cash — the school owns the system, captures the full value of the ITC through direct pay, and retains the long-term energy cost reduction. For tax-exempt institutions, direct pay under the Inflation Reduction Act makes ownership significantly more attractive than it was before 2023, because the ITC can now be received as a cash payment rather than a tax offset that a nonprofit cannot use.

The right structure depends on the institution's capital position, appetite for long-term asset ownership, and ability to manage a maintenance relationship. An independent advisor can model both structures against the school's actual utility bills and help administrators understand the tradeoffs before any developer or installer is engaged.

Rooftop vs. Carport Canopy: Matching the Design to the Campus

Many K-12 campuses have both rooftop area and surface parking lots, which means the system design question — rooftop, carport canopy, or a combination — is a real decision rather than a default. Carport canopies generate power, provide shade for students and staff, and can support EV charging infrastructure for faculty and visitors. They do not consume roof area and do not create roof penetration risk. They are also more expensive per watt than rooftop installations, and the structural requirements for canopy foundations vary by site.

Rooftop installations are lower cost per watt but require roof condition assessment before installation. A school with aging roofing that will need replacement within the next five to ten years should address the roof before or in conjunction with a solar installation — not after. An installer who does not raise the roof condition question in a proposal is leaving a significant project risk unaddressed.

What Independent Review Looks Like for a School Project

When Solar Power San Diego reviews a solar project for a K-12 school, the starting point is 12 months of SDG&E interval data and a review of the school's current rate schedule. Schools are often on general service rate schedules that may not be optimal for a facility with solar, and a rate schedule review before system sizing can affect the financial projections meaningfully.

From there, the review covers system sizing against the school's actual load profile, the demand charge component of the electricity bill and whether battery storage is warranted, the ownership vs. PPA tradeoff modeled against the school's specific financial position, and a line-by-line review of any installer proposals already in hand. We do not install solar systems, do not have referral relationships with installers, and do not earn commissions on equipment sales. Our only interest is that the school makes a well-informed decision.