Solar Lease vs Purchase: How the Math Changes Over 25 Years

The solar installation decision isn't just about whether to go solar—it's whether to own or lease the system. This choice dramatically impacts lifetime value.

A lease costs $0 upfront and $100-$150/month forever. A purchase costs $15,000-$30,000 upfront but eventually becomes free. Over 25 years, the difference in total cost can exceed $50,000.

Yet many homeowners choose leases without understanding the long-term math, falling for the "zero down" pitch without analyzing the 25-year commitment.

Understanding the Two Models

Solar lease (or power purchase agreement, PPA):

• A solar company owns the system on your roof
• You pay a fixed monthly lease, or a price per kWh under a PPA
• Typical cost: $100–$180 a month, often with a 0–2.9% yearly escalator
• No upfront cost
• The company maintains the system and usually guarantees its output
• Any tax credits and incentives go to the owner: the company
• Contracts run 20–25 years

Solar purchase (ownership):

• You own the system
• Upfront cost: $15,000–$30,000 for a typical home system, paid in cash or with a loan
• No federal tax credit since 2026: the 30% residential clean energy credit ended for systems installed after December 31, 2025
• Any state and local incentives are yours
• You pay for repairs once warranties run out, typically an inverter replacement after 10–15 years
• The system stays with the house when you sell

The 25-Year Cost Comparison

The same panels on the same roof produce the same electricity either way, so your bill savings are about the same. What differs is what you pay for them.

Scenario: a $20,000 system, or a lease at $150 a month. Ownership costs include a $2,500 inverter replacement in year 13 and about $40 a year of upkeep.

What the table shows:

• Over 25 years, a cash purchase costs about $23,500 against $45,000 for a flat lease and $64,800 for a lease that rises 2.9% a year: ownership saves roughly $21,000–$41,000.
• Financing at 7% narrows the gap: about $35,900 in all, still $9,000–$29,000 less than leasing.
• In the first decade the lease is about even or cheaper. The case for buying rests on staying long enough to use the system after it is paid for.

Why the Lease Costs More Over Time

Leases look cheap at $0 down, but the price includes things an owner doesn't pay for:

• The company's financing cost and profit. Lease payments are set to pay back the company's investment with a return.
• Escalators. A 2.9% yearly increase turns $150 a month into $194 by year 10 and $298 by year 25.
• Incentives you give up. State rebates, performance payments such as SRECs and any credits go to the system's owner.
• Fixed payments while export values fall. If your utility cuts what it pays for exported solar power, your savings shrink but the lease payment doesn't.

When Solar Lease Makes Sense (Rare Cases)

Case #1: You can't afford the upfront cost and can't finance

If you have zero access to capital and no financing options, a lease beats staying on the grid:

• Lease cost: $150/month
• Utility cost without solar: $300/month
• Savings: $150/month vs. no upfront cost
• This works only if you can't borrow $15,000-$25,000 at reasonable rates

Case #2: You're moving soon (less than 10 years)

If you plan to move in 5 years, purchasing and financing doesn't make sense. A lease transfers with the home or ends:

• 5-year lease cost: $150 × 60 = $9,000
• 5-year purchase cost: $20,000 up front, of which you get back only what buyers will pay extra for the system
• Lease is simpler, provided the buyer is willing to take it over

But even here, ownership with a 10-year financing term might still win.

Case #3: Weak credit/inability to finance

If your credit won't support a solar loan (7-9% rates), compare lease payments to alternative financing:

• Lease: $150/month, approved easily
• HELOC financing: $200/month at better rates is better than lease
• Credit cards: Much worse than lease
• Cash savings: Best option (only works if you have cash)

When Solar Purchase is Clearly Better (Most Cases)

Case #1: You plan to stay 10+ years

The longer you stay, the more the purchase advantage grows:

• 10 years: roughly even (a $20,400 cash purchase against $18,000–$20,540 of lease payments)
• 15 years: buying with cash saves about $4,000–$10,000
• 20 years: about $13,000–$25,000
• 25 years: about $21,000–$41,000

If you're confident about 10+ years in the home, purchase is almost always superior.

Case #2: You can access favorable financing

If you can borrow at around 5% (home equity line or solar loan), ownership is strong even without paying cash:

• A $20,000 loan at 5% costs about $158 a month over 15 years, or $117 over 25 years
• Lease alternative: $150 a month, often rising every year
• The loan payments end, and you own the system for the rest of its life

Watch for solar loans with a low advertised rate that hide a large dealer fee in the price.

Case #3: You plan to upgrade or expand

Ownership allows you to add batteries, expand capacity, or modify the system.

Leases typically lock you into the installed configuration. If your needs change, you're stuck.

The Hidden Complication: Home Sale and System Transfer

Leases create complications when you sell:

Seller's perspective:

• Lease transfers to the new owner at the lease rate
• This might reduce home appealability (new owner inherits $150/month obligation)
• Some buyers won't assume the lease
• Home selling price might be reduced by lease value ($10,000-$15,000 discount)

Buyer's perspective:

• Would you want to inherit someone else's lease?
• You'd prefer the seller to have paid off the system (owned it) and gotten credit for the value

Owned systems transfer perfectly—the buyer assumes a paid-off or nearly-paid-off system. Leased systems complicate the sale.

Real estate agents increasingly report that leased solar creates friction in sales.

Actionable Decision Framework

Choose LEASE if:

• You plan to move in less than 10 years
• You genuinely can't access financing
• You can't/won't take on upfront capital expenditure
• You strongly value "zero down" simplicity

Choose PURCHASE if:

• You plan to stay 10+ years
• You can finance at less than 6%
• You want maximum long-term value
• You value system ownership and customization
• You want to capture state and local incentives

Verify before deciding:

• Can you get approved for financing? (Most homeowners can via HELOC or solar loans)
• What's the actual lease escalation rate? (Annual increases compound)
• How does the home sale complicate the lease?
• What's the true total cost over your expected hold period?

The Bottom Line: Ownership is Nearly Always Superior

Over 25 years a lease costs roughly two to three times as much as buying with cash: $45,000–$65,000 of payments against about $23,500.

This is justified if you need the zero-down entry point and can't finance. But for the majority of homeowners who can secure reasonable financing, ownership is dramatically superior.

The lease industry works because "zero down" has psychological appeal and most homeowners don't run the 25-year numbers.

Run the full calculation, and ownership almost always wins.