Head-to-Head Comparison
| Factor | Buy (Cash) | Buy (Loan) | Lease | PPA |
|---|---|---|---|---|
| Upfront cost | $15,000–$30,000+ | $0–$3,000 | $0 | $0 |
| Monthly payment | None | $120–$250/mo | $120–$200/mo | Per-kWh rate |
| 25-year savings | $40,000–$70,000 | $25,000–$45,000 | $10,000–$25,000 | $10,000–$25,000 |
| Who owns the system | You | You (lien on panels) | Solar company | Solar company |
| Maintenance | You | You (warranty covers most) | Solar company | Solar company |
| Home value increase | +4% (avg) | +4% (avg) | None | None |
| Selling your home | Simple — panels transfer | Simple — pay off loan or transfer | Complicated — buyer must assume lease | Complicated |
| Federal tax credit | N/A (installer keeps) | N/A (installer keeps) | ||
| AZ state tax credit | $1,000 | $1,000 | N/A | N/A |
| Annual escalator | None | Fixed payment | 1–3%/year typical | 1–3%/year typical |
25-Year Financial Comparison (10 kW System in Phoenix)
| Metric | Cash Purchase | Solar Loan (5.9%, 15 yr) | Solar Lease ($150/mo, 2% escalator) |
|---|---|---|---|
| Total cost over 25 years | $24,000 (one-time) | $30,000 (loan payments) | $48,600 (escalating payments) |
| AZ state tax credit | -$1,000 | -$1,000 | $0 |
| Net cost | $23,000 | $29,000 | $48,600 |
| Electricity savings (25 yr) | $60,000–$75,000 | $60,000–$75,000 | N/A (lease replaces bill) |
| Net savings | $37,000–$52,000 | $31,000–$46,000 | $12,000–$22,000 |
| Payback period | 8–11 years | Break-even month 1 | Break-even month 1 |
Assumes 10 kW system, $0.15/kWh average APS rate, 2% annual electricity rate increase, 0.5% annual panel degradation.
When to BUY Solar in Phoenix
Buying is the better choice if:
- You have cash or strong credit — upfront purchase eliminates financing costs entirely
- You'll stay 8+ years — you need to reach payback to realize the savings advantage over leasing
- You want to increase home value — homes with owned solar sell for ~4% more
- You want maximum long-term savings — $20,000–$40,000+ more savings over 25 years
- You're comfortable with maintenance — though warranty covers most issues for 25 years
Best cash purchase strategy for 2026:
- Get 3–5 quotes (use EnergySage + direct installer quotes)
- Choose standard monocrystalline panels (best value/watt)
- Size to offset 80–100% of usage (don't oversize — Phoenix export rates are low)
- Claim the $1,000 AZ state tax credit
- Consider adding battery storage ($8,000–$15,000) to maximize self-consumption
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When to LEASE Solar in Phoenix
Leasing is the better choice if:
- You want $0 upfront cost — no down payment, no loan
- You don't want maintenance responsibility — the solar company handles everything
- You plan to move within 5–8 years — you save from month one without needing to reach payback
- You value simplicity — fixed monthly payment, no ownership headaches
- Your credit doesn't qualify for a good loan rate — leases typically require lower credit scores
Watch out for:
- Escalator clauses. Most leases increase 1–3% per year. A $150/month lease becomes $245/month at 2% escalation over 25 years. If electricity rates don't rise as fast, your savings shrink.
- Home sale complications. The buyer must agree to assume the lease. Some buyers are deterred by this, and it can slow or complicate your sale.
- No home value increase. Since you don't own the panels, your home doesn't get the ~4% value boost that owned solar provides.
- Lower total savings. Over 25 years, leasing saves $10,000–$25,000 vs. $37,000–$52,000 for cash purchase.
Solar Loan: The Middle Ground
A solar loan combines the benefits of ownership with the convenience of $0 (or low) down:
| Loan Feature | Typical Terms |
|---|---|
| Down payment | $0–$3,000 |
| Interest rate | 4.9%–7.9% (2026) |
| Term | 10–25 years |
| Monthly payment | $120–$250 (for 10 kW system) |
| Ownership | You own the system from day one |
| Tax credit | You claim the $1,000 AZ state credit |
| Home value | Increases ~4% |
| Maintenance | Your responsibility (warranty covers most) |
The sweet spot: A 10–15 year solar loan where the monthly payment is less than your current electric bill. You save from month one, own the system, and build home equity — with total savings between cash purchase and lease.
PPA (Power Purchase Agreement) Explained
A PPA is similar to a lease, but instead of a fixed monthly payment, you pay a per-kWh rate for the electricity the panels generate:
| PPA Feature | Details |
|---|---|
| Upfront cost | $0 |
| Rate | $0.08–$0.13/kWh (below APS retail of ~$0.15/kWh) |
| Annual escalator | 1–3% |
| Ownership | Solar company |
| Maintenance | Solar company |
| Best for | Homeowners who want to pay less per kWh without any ownership |
PPA vs. Lease: With a PPA, you pay for actual electricity produced — so if panels underperform, you pay less. With a lease, you pay a fixed amount regardless of production.
Phoenix-Specific Decision Factors
Utility rate plan matters. APS and SRP handle solar differently:
- APS customers: Low export rates ($0.03–$0.05/kWh) mean you should size for self-consumption, not export. Battery storage becomes more valuable.
- SRP customers: Demand charges under the Customer Generation Plan can reduce solar savings. Carefully model your bill under SRP's rate structure before committing.
Extreme heat. Phoenix panels run 10–15% below rated output in summer heat. Both lease and purchase projections should account for this derating.
Tile roofs. Most Phoenix homes have tile roofs. Installation on tile adds $500–$1,500 to purchased systems — leased systems absorb this cost into the lease pricing.
It depends on your priorities. Buying (cash or loan) saves $20,000–$40,000 more over 25 years, increases home value by ~4%, and gives you full ownership. Leasing costs $0 upfront, saves money from day one, and includes maintenance — but provides lower total savings ($10,000–$25,000 over 25 years) and can complicate home sales. The federal 30% tax credit expired in mid-2025, making leasing more competitive since installers still capture commercial tax benefits. Buy if you'll stay 8+ years and want maximum savings. Lease if you want zero upfront cost and simplicity.
Over 25 years, Phoenix homeowners can save $37,000–$52,000 with a cash purchase, $31,000–$46,000 with a solar loan, or $10,000–$25,000 with a lease. Savings depend on system size, electricity usage, utility rate plan (APS vs. SRP), and whether you add battery storage. Phoenix averages 299 sunny days per year, making it one of the best solar markets in the U.S. Even without the federal tax credit, solar is a strong investment — you'll still recoup your costs in 8–11 years with a cash purchase and save $30,000–$50,000+ over the system's lifetime.
When you sell a home with a leased solar system, the buyer must agree to assume the remaining lease — they take over your monthly payments and contract terms. Some buyers are deterred by this obligation, which can slow or complicate your sale. Options: (1) transfer the lease to the buyer (most common), (2) buy out the remaining lease and either keep or remove the panels, or (3) prepay the remaining lease term. Buyout costs typically range from $5,000–$15,000 depending on remaining term. Owned solar panels avoid this issue entirely — they transfer with the home and increase its value by ~4%.
Pricing and savings data sourced from EnergySage, Solar Reviews, ConsumerAffairs, Palmetto, and SouthFace Solar. Federal tax credit status per the Big Beautiful Bill Act (signed July 2025). Arizona incentive data from the Arizona Department of Revenue and DSIRE (Database of State Incentives for Renewables & Efficiency). Utility rate data from APS and SRP published rate schedules. For solar panel pricing details, see our Phoenix solar panel cost guide.
