Solar lending is a category of consumer and commercial financing specifically designed to fund the installation of rooftop solar photovoltaic systems, battery storage, and related renewable energy equipment. Lenders offering solar products underwrite against a combination of borrower creditworthiness, home equity position, and expected energy savings — with loan amounts typically ranging from $15,000 to $65,000 and terms of 5 to 25 years. The solar lending market has grown rapidly alongside federal and state renewable energy incentives and declining solar equipment costs, creating a significant specialized consumer finance segment.
Introduction to Solar Lending
The U.S. residential solar market has experienced compounding growth over the past decade, driven by declining panel costs (which have fallen more than 90% since 2010), the federal solar Investment Tax Credit (ITC), state-level renewable portfolio standards, and increasing consumer interest in energy independence and climate impact. According to the Solar Energy Industries Association, residential solar installations have become a multi-billion-dollar annual market. As the market has grown, a specialized solar lending sector has emerged — distinct from conventional home improvement lending in its underwriting approach, loan structures, and regulatory environment.
Solar lending exists alongside two competing financing structures: solar leases and Power Purchase Agreements (PPAs). Under a lease, the homeowner pays a monthly fee to use a solar system owned by the leasing company. Under a PPA, the homeowner pays for the electricity the system produces at a predetermined per-kilowatt-hour rate. Solar loans, by contrast, allow the homeowner to own the system outright — making them eligible for the federal ITC (which allows homeowners to claim a credit equal to a percentage of the system cost against their federal tax liability) while building equity in a home improvement asset. The choice between loan, lease, and PPA involves trade-offs in upfront cost, long-term savings, and tax benefit eligibility that drive different consumer segments toward different structures.
How Solar Lending Works
Solar loans are typically structured as unsecured home improvement installment loans or UCC-1 secured financing (where the lender files a UCC fixture filing on the solar equipment, which is legally classified as a fixture once attached to the home). Some solar lending programs use Property Assessed Clean Energy (PACE) financing — a mechanism where the loan is repaid through the property tax bill, secured by a property tax assessment lien that is senior to the mortgage. PACE financing has been controversial because homeowners sometimes did not understand that PACE assessments could jeopardize their ability to refinance or sell the home, leading the CFPB to propose extending Regulation Z coverage to PACE transactions.
Solar loan underwriting combines traditional consumer credit factors with solar-specific variables. On the credit side: FICO score (most solar lenders require prime-plus borrowers with scores of 650 or above), debt-to-income ratio, home equity (for programs that require a minimum equity cushion), and payment history. On the solar side: system size and expected energy production (which determines the savings against utility bills that justify the loan payment), installer quality and warranty terms (since the lender’s collateral value depends on a functioning system), and jurisdiction-specific factors including utility net metering policies and state incentive program availability. Some solar lenders use “solar savings” — the expected reduction in utility bills from solar production — as a compensating factor in underwriting, arguing that the net payment impact on the borrower (loan payment minus energy savings) is the relevant affordability metric.
Installer relationships are central to solar lending origination. Most residential solar loans are originated through the solar installer — the contractor or company that sells and installs the solar system. Lenders that want to reach residential solar borrowers must build dealer/installer networks, provide installers with portal access for application submission, and offer competitive loan products that installers will recommend to their customers. The quality of the installer — their financial stability, warranty coverage, licensing, and installation practices — directly affects the lender’s collateral quality and default risk, making installer due diligence and ongoing monitoring essential elements of a solar lending program.
Example
A specialty solar lender with $280 million in managed solar loan assets conducts a portfolio analysis segmented by installer partner. The analysis reveals that loans originated through one installer network — representing 8% of the portfolio by count — have a 60-day delinquency rate of 9.4% versus the portfolio average of 3.1%. Investigation reveals the installer has been providing borrowers with overstated energy production estimates that do not match actual system performance — creating a situation where borrowers feel deceived by their actual savings, contributing to payment motivation problems. The lender places the installer on probation (halting new originations through that channel), adjusts its underwriting standards for installer-provided energy production estimates across all partners, and implements an independent production estimate verification step for loans above $30,000. Over the following 12 months, portfolio delinquency improves to 2.8% as the underwriting enhancement screens out loans based on unrealistic savings projections.
Regulatory Considerations in Solar Lending
Solar loans are consumer credit subject to standard federal regulatory requirements: Regulation Z TILA disclosures (APR, finance charge, payment schedule), Regulation B ECOA fair lending requirements, and UDAAP standards enforced by the CFPB. The PACE financing segment is subject to additional regulatory scrutiny — the CFPB has proposed extending Regulation Z disclosures to PACE transactions after finding that PACE borrowers were often not clearly informed of the property lien implications and repayment mechanics of their financing.
State law introduces additional complexity. Some states have specific licensing requirements for solar lenders distinct from conventional consumer lending licenses. California — the largest solar market — has enacted the Solar Energy System Disclosures Act, which requires specific disclosures in solar financing contracts about expected energy production, savings estimates, warranty terms, and the implications of PACE assessments. Lenders entering the solar market must conduct state-by-state legal analysis and build state-specific product configurations rather than assuming conventional consumer lending law is the only applicable framework. See the CFPB’s PACE loan regulatory resources and the Department of Energy’s homeowner guide to solar tax credits for market and regulatory context.
Bottom Line
Solar lending is a growing, specialized consumer finance segment with unique underwriting requirements, installer network dynamics, and regulatory considerations that distinguish it from conventional home improvement lending. Lenders entering the solar market need flexible loan management technology that can handle the product structures, origination workflows, and compliance requirements specific to solar financing. Vergent LMS supports solar loan programs with configurable installment loan structures, installer portal capabilities, automated TILA-compliant disclosure generation, and portfolio analytics — providing the operational foundation for a scalable solar lending program.
