Solar Financing Options for Washington Residents: Loans, Leases, and PPAs

Washington homeowners and property owners face a concrete set of financing decisions before any solar installation can proceed — decisions that affect ownership rights, long-term costs, tax credit eligibility, and resale complications. This page examines the three dominant financing structures available for residential solar in Washington State: secured and unsecured loans, solar leases, and power purchase agreements (PPAs). Understanding the mechanics, tradeoffs, and classification boundaries of each structure is essential for comparing installer proposals with precision.

• Definition and Scope
• Core Mechanics or Structure
• Causal Relationships or Drivers
• Classification Boundaries
• Tradeoffs and Tensions
• Common Misconceptions
• Checklist or Steps
• Reference Table or Matrix

Definition and Scope

Solar financing refers to the contractual and credit mechanisms that allow property owners to install photovoltaic (PV) systems without paying the full equipment and installation cost at the time of project completion. In Washington State, the three primary structures are:

• Solar loans — debt instruments where the borrower retains ownership of the system
• Solar leases — arrangements where a third party owns the equipment and charges a fixed monthly fee
• Power purchase agreements (PPAs) — contracts where a third-party system owner sells electricity output at a per-kilowatt-hour rate to the host customer

Each structure carries different implications for Washington's net metering program, federal tax credit eligibility, utility interconnection requirements, and property transfer procedures.

Scope and coverage limitations: This page applies specifically to Washington State residential solar financing. It does not cover commercial financing structures (addressed separately at solar energy for commercial properties), agricultural financing contexts (see solar for agricultural operations), or community solar subscription arrangements (see Washington community solar programs). Federal tax law referenced here draws on IRS guidance applicable nationally; Washington-specific statutes cited are governed by the Revised Code of Washington (RCW) and Washington Administrative Code (WAC). Financing structures described here do not constitute legal, tax, or financial advice.

Core Mechanics or Structure

Solar Loans

Solar loans function as either secured debt (with the system or home serving as collateral) or unsecured personal loans. Secured options include:

• Home equity loans and HELOCs — backed by real property equity; interest may be deductible under IRS rules depending on loan purpose
• FHA Title I Property Improvement Loans — federally backed, capped at $25,000 for single-family properties per HUD program guidance
• Fannie Mae HomeStyle Energy Mortgage — allows financing of energy improvements into a mortgage at time of purchase or refinance (Fannie Mae)
• Unsecured solar-specific loans — offered by specialty lenders; typically carry higher interest rates than home-equity products but do not encumber the property title

Under a loan structure, the borrower owns the system outright. This means eligibility for the federal Investment Tax Credit (ITC) — set at 30% of eligible system costs through 2032 under 26 U.S.C. § 48E / the Inflation Reduction Act — flows directly to the homeowner, not a third party.

Solar Leases

A solar lease is a contract between the homeowner and a solar services company (the lessor). The lessor retains ownership of the panels, inverter, and associated equipment installed on the customer's roof. The customer pays a fixed monthly fee — often structured with an annual escalator clause of 1–3% per year — in exchange for use of the system's electricity output.

Because the lessor owns the equipment, the lessor claims the ITC, not the homeowner. Lease terms in the residential market typically run 20–25 years.

Power Purchase Agreements (PPAs)

A PPA differs from a lease in that the customer does not pay for the system itself — the customer pays per kilowatt-hour of electricity actually produced. If the system underperforms (due to shade, weather, or equipment degradation), the customer pays less. If it overproduces relative to consumption, the customer may receive net metering credits from their utility under Washington's net metering statute (RCW 80.60).

PPAs are available in Washington but are subject to utility commission oversight. The Washington Utilities and Transportation Commission (UTC) regulates utility service and has jurisdiction over certain third-party energy sales arrangements under RCW Title 80.

Causal Relationships or Drivers

Three primary drivers shape which financing structure is selected in Washington:

1. Credit profile and home equity availability — Homeowners with substantial equity and strong credit access the lowest interest rates through secured loans. Those with limited equity or lower credit scores may find unsecured solar loans or third-party ownership arrangements more accessible.

2. Tax liability — The 30% federal ITC is only useful to taxpayers with sufficient federal income tax liability to absorb the credit. Homeowners with low tax liability may derive less benefit from ownership structures and more value from third-party arrangements where the system owner can monetize the credit.

3. Washington's clean energy policy context — Washington's Clean Energy Transformation Act (CETA), enacted in 2019, mandates that utilities achieve 100% clean electricity by 2045. This policy context, combined with rising retail electricity rates from investor-owned utilities regulated by the UTC, changes the long-run value calculus for locking in energy costs via a PPA or owning a system outright. For additional background on the state policy environment, see Washington state energy policy and solar.

For a technical grounding in how Washington solar systems generate and deliver power — before evaluating financing — see how Washington solar energy systems work.

Classification Boundaries

The three financing structures are not always cleanly separated in installer marketing materials. Key definitional boundaries:

• A lease obligates payment regardless of system output; a PPA obligates payment based on metered output. Conflating these creates contract review errors.
• A loan always transfers ownership to the buyer at installation completion (or after final payment for dealer-financed arrangements); leases and PPAs do not transfer ownership unless a purchase option is exercised.
• PACE financing (Property Assessed Clean Energy) is a separate fourth category — repaid through property tax assessments under Washington's PACE authority (RCW 36.165) — and carries distinct lien priority implications distinct from all three primary structures above.

Washington's regulatory context for solar energy systems covers the permitting, inspection, and utility interconnection obligations that apply regardless of financing type.

Tradeoffs and Tensions

Ownership vs. Accessibility

Loan structures yield full system ownership and ITC eligibility, but require creditworthiness and may add a lien to the property. Lease and PPA structures lower or eliminate upfront barriers but surrender the tax credit and complicate property sale — buyers must either assume the contract or the seller must pay out the buyout clause.

Escalator Clauses

Lease and PPA contracts frequently include annual payment escalators of 1–3%. If Washington retail electricity rates rise more slowly than the escalator rate, the cost advantage narrows or reverses over the contract term.

Permitting Obligations Remain Constant

Regardless of financing type, the installer — not the financing structure — determines whether permitting is properly filed. Washington solar installations require permits under the Washington State Building Code (WAC 51-50) and electrical permits under WAC 296-46B. These obligations are not altered by third-party ownership arrangements.

HOA and Title Complications

Third-party ownership arrangements (leases and PPAs) can complicate title transfers and HOA compliance under Washington's solar access rights framework. See Washington HOA solar installation rules for the applicable RCW provisions.

Common Misconceptions

Misconception: A solar lease means the homeowner owns the panels.
Correction: Under a lease, the solar services company retains legal ownership of all equipment. The homeowner is a lessee, not an owner. Title to the panels does not transfer unless a contractual purchase option is exercised.

Misconception: Washington's sales tax exemption for solar applies equally to all financing types.
Correction: Washington's retail sales tax exemption for solar energy systems (RCW 82.08.962) applies to the sale of solar energy equipment. Under a PPA or lease, the solar company — not the homeowner — is the purchaser of the equipment, which can affect how the exemption is allocated and claimed at the transaction level.

Misconception: The federal ITC is available to homeowners who sign PPAs.
Correction: The IRS credits the system owner. Under a PPA or lease, the third-party company owns the system and claims the 30% ITC (IRS Form 5695 is used by individual homeowners for owned systems only). Homeowners who lease or enter PPAs do not receive the ITC directly. See Washington federal solar tax credit applicability for further detail.

Misconception: Unsecured solar loans are always more expensive than leases.
Correction: Total cost of ownership depends on the loan's APR, the lease escalator rate, the system's actual production, and the term length. No blanket cost hierarchy holds across all contract scenarios.

Checklist or Steps

The following steps describe the sequence of verification activities associated with evaluating solar financing structures. This is a factual process framework, not advisory guidance.

1. Obtain itemized proposals — Require each installer to separate equipment costs, installation costs, and financing costs in writing.
2. Identify the system ownership entity — Confirm whether the contract results in immediate homeowner ownership or third-party ownership.
3. Verify ITC eligibility — Cross-reference ownership structure against IRS guidance on Residential Clean Energy Credit (Form 5695).
4. Review escalator clauses — Identify any annual payment escalator percentages in lease or PPA contracts and model total payments over the full contract term.
5. Confirm purchase option terms — For leases and PPAs, identify the buyout price schedule (typically specified at years 5, 10, 15, and 20).
6. Check lien implications — For secured loans, HELOC, or PACE financing, confirm lien priority and mortgage lender approval requirements.
7. Verify Washington net metering credit handling — Determine how net metering credits are allocated between the system owner and the host customer under the specific contract type (RCW 80.60).
8. Confirm permitting responsibility — Establish in the contract which party files for and manages Washington building and electrical permits under WAC 51-50 and WAC 296-46B.
9. Review transfer and assumption provisions — Identify contractual procedures for property sale, including assignment clauses for lease or PPA contracts.
10. Assess Washington incentive compatibility — Check whether any state or utility rebate programs require homeowner ownership of the system as a condition of eligibility. See Washington solar incentives and tax credits.

For a comprehensive overview of the Washington solar installation process from permitting through interconnection, see process framework for Washington solar energy systems. For contractor licensing standards relevant to all financing types, see Washington solar contractor licensing standards. A full overview of the solar landscape in Washington is available on the Washington Solar Authority home page.

Reference Table or Matrix

Solar Financing Comparison Matrix — Washington Residential

References

• IRS Residential Clean Energy Credit (Form 5695)
• IRS Inflation Reduction Act – Clean Energy Tax Credits (26 U.S.C. § 48E)
• Washington Revised Code (RCW) 80.60 – Net Metering
• Washington Revised Code (RCW) Title 80 – Public Utilities
• Washington Revised Code (RCW) 82.08.962 – Solar Energy System Sales Tax Exemption
• Washington Revised Code (RCW) 36.165 – PACE Financing
• Washington Revised Code (RCW) 19.405 – Clean Energy Transformation Act
• Washington Administrative Code (WAC) 51-50 – State Building Code
• Washington Administrative Code (WAC) 296-46B – Electrical Safety Standards
• Washington Utilities and Transportation Commission (UTC)
• HUD Title I Property Improvement Loan Program
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