PPA, Lease, or Ownership: How Commercial Organizations Should Evaluate Solar Financing

When a solar installer presents you with a proposal, the financing structure they recommend is rarely the one that is best for your organization. It is usually the one that is easiest for them to close. Understanding the real differences between a Power Purchase Agreement, a lease, and direct ownership is essential before you commit to a 20–25 year contract.

Power Purchase Agreement (PPA)

In a PPA, a third-party developer owns the solar system installed on your property. You agree to purchase the electricity it generates at a fixed rate — typically below your current utility rate — for a term of 15–25 years.

Advantages:

• No upfront capital required
• Maintenance and performance guarantees typically included
• Immediate savings from day one if the PPA rate is below your utility rate
• Works well for nonprofits and municipalities that cannot use tax credits directly

Disadvantages:

• You do not own the system and cannot claim tax incentives
• Annual escalators (typically 1–3%) can erode savings over time if utility rates do not rise as projected
• Property sale or lease transfer complications — the PPA must transfer with the property
• Long contract terms with early termination penalties
• The developer captures the 30% federal Investment Tax Credit and accelerated depreciation — not you

Solar Lease

A solar lease is structurally similar to a PPA, but instead of paying per kilowatt-hour generated, you pay a fixed monthly lease payment for use of the equipment. The third party still owns the system.

Advantages:

• Predictable fixed monthly cost
• No upfront capital
• Maintenance typically included

Disadvantages:

• Same ownership and tax credit limitations as a PPA
• You pay the lease regardless of system production
• Less common for commercial applications — PPAs are generally preferred

Direct Ownership (Cash or Loan)

Direct ownership — whether purchased outright or financed through a commercial loan or C-PACE financing — gives your organization full ownership of the system and access to all available incentives.

Advantages:

• Full access to the 30% federal Investment Tax Credit
• Accelerated depreciation (MACRS 5-year) significantly reduces net cost for tax-paying entities
• Highest long-term return on investment — typically 15–25% IRR for well-structured commercial projects
• No contract encumbrance on property sale
• C-PACE financing allows 100% project financing repaid through property tax assessments — no upfront cost, no balance sheet impact

Disadvantages:

• Requires capital or financing capacity
• Organization bears performance and maintenance risk (mitigated by strong warranties)
• Tax credits only benefit tax-paying entities — nonprofits and municipalities typically cannot use them directly (though a PPA structure can pass the benefit through)

The Analysis That Actually Matters

The right financing structure depends on your organization's tax position, capital availability, risk tolerance, property tenure, and long-term energy strategy. A 25-year NPV analysis comparing all three structures — using realistic utility rate escalation assumptions and your actual tax rate — will typically show a clear winner.

What installers rarely provide is an honest side-by-side comparison. They present the structure that works for their business model. An independent advisor models all three options against your specific financial situation and recommends the structure that maximizes value for your organization.

For most commercial organizations with tax appetite, direct ownership — particularly with C-PACE or low-cost commercial financing — delivers the highest long-term return. For nonprofits, municipalities, and organizations without capital, a well-structured PPA with a creditworthy developer can still deliver meaningful savings. The key is knowing which structure you are actually being offered and what it will cost over the full contract term.