Commercial Solar PPA vs Purchase vs Lease: What Actually Makes Sense for California Businesses

Commercial solar PPA vs purchase is the question every business owner hits once the savings projections look real. The answer isn’t one-size-fits-all — but it’s also not that complicated once you understand what you’re actually trading.

Here’s how each structure works, what you give up, and what the math looks like for a California commercial buyer in 2026.

The Three Structures, Briefly

Purchase (cash or financed). Your business buys the system outright or finances it. You own the panels, the inverters, the production, and the tax benefits. You carry the performance risk and maintenance responsibility.

PPA (Power Purchase Agreement). A third-party developer installs and owns the system on your property. You buy the electricity it generates at a contracted rate — typically 10–20% below your current utility rate. No upfront cost, no ownership, no tax credits.

Lease. Similar to a PPA but you pay a fixed monthly fee for use of the system, not a per-kWh electricity rate. The third party still owns it. You still don’t get the ITC.

The ownership question is what separates purchase from the other two. Everything else — upfront cost, risk allocation, long-term economics — flows from that.

Buying the System: When Ownership Wins

If your business has meaningful federal tax liability, ownership is almost always the right call financially. Here’s why.

The ITC is worth 30% of the installed cost. On a $400,000 system, that’s $120,000 back as a direct tax credit. That’s not a deduction — it reduces your tax bill dollar-for-dollar. The credit belongs to whoever owns the system. If a third party owns it, they keep it.

MACRS depreciation adds another layer. Commercial solar qualifies for 5-year Modified Accelerated Cost Recovery depreciation. With current bonus depreciation rules, many businesses can accelerate a significant portion of the remaining system cost into year one. Combined with the ITC, total first-year tax benefits can cover 45–55% of gross system cost for a profitable business.

Payback on a California commercial system: 5–8 years. After that, you’re generating electricity at close to zero marginal cost for the remaining 20+ years of system life. SCE and SDG&E commercial rates are among the highest in the country — that free production is worth more here than almost anywhere else in the US.

Financed purchase. If you don’t want to deploy capital, you can finance. Commercial solar loans typically run 5–10 years at rates that often make the monthly debt service less than your current utility bill reduction. You still claim the ITC and depreciation. The economics are slightly less favorable than an all-cash purchase but significantly better than a PPA or lease for most businesses.

The scenario where purchase doesn’t make sense: your business doesn’t generate enough federal taxable income to absorb the ITC and depreciation benefits in a reasonable timeframe. Tax-exempt organizations, startups burning cash, or businesses with heavy losses run into this. In those cases, a third-party structure that lets the developer monetize the credits can still deliver meaningful savings — just not the maximum possible value.

PPA: What You Get, What You Give Up

A PPA’s main pitch is simplicity. No capital required. No system ownership. No maintenance headaches. You sign a 15–25 year agreement to buy power at a locked rate below what the utility charges today.

That locked rate typically has an escalator — 1–3% per year. Over a 20-year term, that can mean your PPA rate ends up higher than your utility rate in later years, or at parity. Read the escalator clause carefully.

What you’re giving up:

• The 30% ITC (stays with the developer)
• MACRS depreciation (stays with the developer)
• The residual value of the system after payback (they own it)
• Flexibility — you now have a long-term contract tied to the property

The developer’s ability to offer you below-market electricity rates is funded almost entirely by the ITC and depreciation they capture on your behalf. You’re trading the tax benefits for rate certainty and zero upfront cost.

For the right buyer, that’s a reasonable trade. Tax-exempt entities — nonprofits, government facilities, universities — can’t use the ITC directly. A PPA lets them capture some of the benefit indirectly through lower rates. Businesses with limited access to capital or no tax liability are in a similar position.

For a profitable California business with normal tax liability, it’s usually a worse deal than ownership. The NPV of a 20-year PPA almost always trails the NPV of outright ownership when you model the ITC, depreciation, and post-payback production at current California rates.

Solar Lease: The PPA’s Cousin

A lease works similarly to a PPA — third-party ownership, no ITC for your business, long-term contract — but the payment structure is different.

In a lease, you pay a fixed monthly amount regardless of how much power the system produces. In a PPA, you pay per kilowatt-hour generated.

That distinction matters if production underperforms. Under a PPA, you pay less because you got less electricity. Under a lease, you pay the same fixed amount regardless. Most commercial leases include production guarantees, but the mechanics and remedy processes vary. Understand what happens when the system underperforms before you sign.

Leases also typically have the same escalator structure as PPAs — your monthly payment increases 1–3% per year. Over a 20-year term, that adds up.

The financial case for leasing versus purchasing is similar to the PPA comparison: if your business can use the ITC and depreciation, ownership wins. If not, a lease can deliver savings without capital investment.

The Comparison in Practice

Here’s a simplified scenario for a 200 kW rooftop system in Southern California:

Purchase (cash):

• Gross installed cost: ~$540,000
• 30% ITC: -$162,000
• MACRS depreciation benefit (estimated): -$90,000–$120,000
• Net effective cost after incentives: ~$260,000–$290,000
• Annual electricity savings (est. at $0.22/kWh blended rate): ~$60,000–$75,000
• Payback: 4–5 years
• 25-year NPV: strong positive — system produces free electricity for 15–20 years post-payback

PPA:

• Upfront cost: $0
• Annual savings vs. current utility rate: 10–15% in year one
• PPA rate escalator: 2% annually
• ITC: stays with developer
• 25-year NPV: positive but significantly lower than ownership for a business with normal tax liability

The difference compounds over time. A profitable business that can absorb the ITC and depreciation in years 1–2 is essentially cutting the net cost of ownership by nearly half. The PPA developer captures that same value — and passes a fraction back to you as a rate discount.

One More Factor: Property Transactions

If you own or plan to sell the property, system ownership is simpler. You own the asset outright. A buyer values it accordingly.

With a PPA or lease, the contract transfers to the new owner — or requires assignment approval from the developer. That can complicate or delay a transaction. It’s not a dealbreaker, but it’s a real consideration for property owners thinking about liquidity.

For tenants, the calculus flips. A PPA or lease puts the financial obligation on the developer, not the lease-holder. A purchase makes more sense when you control the property long enough to capture the payback.

Which Structure Fits Your Situation

• Profitable business, own the building, 5+ year horizon — buy it, cash or financed. The ITC and depreciation more than justify the capital deployment.
• No federal tax liability (nonprofit, government, startup) — a PPA can still deliver real savings. Shop multiple developers.
• Tenant, short lease term, or capital constraints — PPA or lease reduces your exposure. Just model the escalator carefully.
• Considering a property sale in the next 3–5 years — factor in the contract assignment complexity before signing a 20-year PPA.

There’s no universal right answer, but there is a right answer for your specific situation. The math isn’t complicated — it just requires running actual numbers, not rule-of-thumb comparisons.

Ready to Model the Numbers for Your Building?

We’ll put the ownership vs. PPA comparison in front of you — side by side, with your actual utility data — before you make any decisions.

Schedule a consultation or call us at (949) 877-8008.

Related reading:

• Commercial Solar Cost in California: What to Budget in 2026
• FEOC Requirements for Commercial Solar: What California Businesses Must Know
• AB 2143 and Prevailing Wage: How to Avoid Higher Project Costs